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(u32 dss_count, 274 gfp_t gfp_flags) 275 { 276 struct nfs4_ff_layout_mirror *mirror; 277 278 mirror = kzalloc(sizeof(*mirror), gfp_flags); 279 if (mirror == NULL) 280 return NULL; 281 282 spin_lock_init(&mirror->lock); 283 refcount_set(&mirror->ref, 1); 284 INIT_LIST_HEAD(&mirror->mirrors); 285 286 mirror->dss_count = dss_count; 287 mirror->dss = 288 kcalloc(dss_count, sizeof(struct nfs4_ff_layout_ds_stripe), 289 gfp_flags); 290 if (mirror->dss == NULL) { 291 kfree(mirror); 292 return NULL; 293 } 294 295 for (u32 dss_id = 0; dss_id < mirror->dss_count; dss_id++) 296 nfs_localio_file_init(&mirror->dss[dss_id].nfl); 297 298 return mirror; 299 } 300 301 static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror) 302 { 303 const struct cred *cred; 304 u32 dss_id; 305 306 ff_layout_remove_mirror(mirror); 307 308 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { 309 kfree(mirror->dss[dss_id].fh_versions); 310 cred = rcu_access_pointer(mirror->dss[dss_id].ro_cred); 311 put_cred(cred); 312 cred = rcu_access_pointer(mirror->dss[dss_id].rw_cred); 313 put_cred(cred); 314 nfs_close_local_fh(&mirror->dss[dss_id].nfl); 315 nfs4_ff_layout_put_deviceid(mirror->dss[dss_id].mirror_ds); 316 } 317 318 kfree(mirror->dss); 319 kfree(mirror); 320 } 321 322 static void ff_layout_put_mirror(struct nfs4_ff_layout_mirror *mirror) 323 { 324 if (mirror != NULL && refcount_dec_and_test(&mirror->ref)) 325 ff_layout_free_mirror(mirror); 326 } 327 328 static void ff_layout_free_mirror_array(struct nfs4_ff_layout_segment *fls) 329 { 330 u32 i; 331 332 for (i = 0; i < fls->mirror_array_cnt; i++) 333 ff_layout_put_mirror(fls->mirror_array[i]); 334 } 335 336 static void _ff_layout_free_lseg(struct nfs4_ff_layout_segment *fls) 337 { 338 if (fls) { 339 ff_layout_free_mirror_array(fls); 340 kfree(fls); 341 } 342 } 343 344 static bool 345 ff_lseg_match_mirrors(struct pnfs_layout_segment *l1, 346 struct pnfs_layout_segment *l2) 347 { 348 const struct nfs4_ff_layout_segment *fl1 = FF_LAYOUT_LSEG(l1); 349 const struct nfs4_ff_layout_segment *fl2 = FF_LAYOUT_LSEG(l2); 350 u32 i; 351 352 if (fl1->mirror_array_cnt != fl2->mirror_array_cnt) 353 return false; 354 for (i = 0; i < fl1->mirror_array_cnt; i++) { 355 if (fl1->mirror_array[i] != fl2->mirror_array[i]) 356 return false; 357 } 358 return true; 359 } 360 361 static bool 362 ff_lseg_range_is_after(const struct pnfs_layout_range *l1, 363 const struct pnfs_layout_range *l2) 364 { 365 u64 end1, end2; 366 367 if (l1->iomode != l2->iomode) 368 return l1->iomode != IOMODE_READ; 369 end1 = pnfs_calc_offset_end(l1->offset, l1->length); 370 end2 = pnfs_calc_offset_end(l2->offset, l2->length); 371 if (end1 < l2->offset) 372 return false; 373 if (end2 < l1->offset) 374 return true; 375 return l2->offset <= l1->offset; 376 } 377 378 static bool 379 ff_lseg_merge(struct pnfs_layout_segment *new, 380 struct pnfs_layout_segment *old) 381 { 382 u64 new_end, old_end; 383 384 if (test_bit(NFS_LSEG_LAYOUTRETURN, &old->pls_flags)) 385 return false; 386 if (new->pls_range.iomode != old->pls_range.iomode) 387 return false; 388 old_end = pnfs_calc_offset_end(old->pls_range.offset, 389 old->pls_range.length); 390 if (old_end < new->pls_range.offset) 391 return false; 392 new_end = pnfs_calc_offset_end(new->pls_range.offset, 393 new->pls_range.length); 394 if (new_end < old->pls_range.offset) 395 return false; 396 if (!ff_lseg_match_mirrors(new, old)) 397 return false; 398 399 /* Mergeable: copy info from 'old' to 'new' */ 400 if (new_end < old_end) 401 new_end = old_end; 402 if (new->pls_range.offset < old->pls_range.offset) 403 new->pls_range.offset = old->pls_range.offset; 404 new->pls_range.length = pnfs_calc_offset_length(new->pls_range.offset, 405 new_end); 406 if (test_bit(NFS_LSEG_ROC, &old->pls_flags)) 407 set_bit(NFS_LSEG_ROC, &new->pls_flags); 408 return true; 409 } 410 411 static void 412 ff_layout_add_lseg(struct pnfs_layout_hdr *lo, 413 struct pnfs_layout_segment *lseg, 414 struct list_head *free_me) 415 { 416 pnfs_generic_layout_insert_lseg(lo, lseg, 417 ff_lseg_range_is_after, 418 ff_lseg_merge, 419 free_me); 420 } 421 422 static u32 ff_mirror_efficiency_sum(const struct nfs4_ff_layout_mirror *mirror) 423 { 424 u32 dss_id, sum = 0; 425 426 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) 427 sum += mirror->dss[dss_id].efficiency; 428 429 return sum; 430 } 431 432 static void ff_layout_sort_mirrors(struct nfs4_ff_layout_segment *fls) 433 { 434 int i, j; 435 436 for (i = 0; i < fls->mirror_array_cnt - 1; i++) { 437 for (j = i + 1; j < fls->mirror_array_cnt; j++) 438 if (ff_mirror_efficiency_sum(fls->mirror_array[i]) < 439 ff_mirror_efficiency_sum(fls->mirror_array[j])) 440 swap(fls->mirror_array[i], 441 fls->mirror_array[j]); 442 } 443 } 444 445 static struct pnfs_layout_segment * 446 ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh, 447 struct nfs4_layoutget_res *lgr, 448 gfp_t gfp_flags) 449 { 450 struct pnfs_layout_segment *ret; 451 struct nfs4_ff_layout_segment *fls = NULL; 452 struct xdr_stream stream; 453 struct xdr_buf buf; 454 struct folio *scratch; 455 u64 stripe_unit; 456 u32 mirror_array_cnt; 457 __be32 *p; 458 int i, rc; 459 struct nfs4_ff_layout_ds_stripe *dss_info; 460 461 dprintk("--> %s\n", __func__); 462 scratch = folio_alloc(gfp_flags, 0); 463 if (!scratch) 464 return ERR_PTR(-ENOMEM); 465 466 xdr_init_decode_pages(&stream, &buf, lgr->layoutp->pages, 467 lgr->layoutp->len); 468 xdr_set_scratch_folio(&stream, scratch); 469 470 /* stripe unit and mirror_array_cnt */ 471 rc = -EIO; 472 p = xdr_inline_decode(&stream, 8 + 4); 473 if (!p) 474 goto out_err_free; 475 476 p = xdr_decode_hyper(p, &stripe_unit); 477 mirror_array_cnt = be32_to_cpup(p++); 478 dprintk("%s: stripe_unit=%llu mirror_array_cnt=%u\n", __func__, 479 stripe_unit, mirror_array_cnt); 480 481 if (mirror_array_cnt > NFS4_FLEXFILE_LAYOUT_MAX_MIRROR_CNT || 482 mirror_array_cnt == 0) 483 goto out_err_free; 484 485 rc = -ENOMEM; 486 fls = kzalloc(struct_size(fls, mirror_array, mirror_array_cnt), 487 gfp_flags); 488 if (!fls) 489 goto out_err_free; 490 491 fls->mirror_array_cnt = mirror_array_cnt; 492 fls->stripe_unit = stripe_unit; 493 494 u32 dss_count = 0; 495 for (i = 0; i < fls->mirror_array_cnt; i++) { 496 struct nfs4_ff_layout_mirror *mirror; 497 struct cred *kcred; 498 const struct cred __rcu *cred; 499 kuid_t uid; 500 kgid_t gid; 501 u32 fh_count, id; 502 int j, dss_id; 503 504 rc = -EIO; 505 p = xdr_inline_decode(&stream, 4); 506 if (!p) 507 goto out_err_free; 508 509 // Ensure all mirrors have same stripe count. 510 if (dss_count == 0) 511 dss_count = be32_to_cpup(p); 512 else if (dss_count != be32_to_cpup(p)) 513 goto out_err_free; 514 515 if (dss_count > NFS4_FLEXFILE_LAYOUT_MAX_STRIPE_CNT || 516 dss_count == 0) 517 goto out_err_free; 518 519 if (dss_count > 1 && stripe_unit == 0) 520 goto out_err_free; 521 522 fls->mirror_array[i] = ff_layout_alloc_mirror(dss_count, gfp_flags); 523 if (fls->mirror_array[i] == NULL) { 524 rc = -ENOMEM; 525 goto out_err_free; 526 } 527 528 for (dss_id = 0; dss_id < dss_count; dss_id++) { 529 dss_info = &fls->mirror_array[i]->dss[dss_id]; 530 dss_info->mirror = fls->mirror_array[i]; 531 532 /* deviceid */ 533 rc = decode_deviceid(&stream, &dss_info->devid); 534 if (rc) 535 goto out_err_free; 536 537 /* efficiency */ 538 rc = -EIO; 539 p = xdr_inline_decode(&stream, 4); 540 if (!p) 541 goto out_err_free; 542 dss_info->efficiency = be32_to_cpup(p); 543 544 /* stateid */ 545 rc = decode_pnfs_stateid(&stream, &dss_info->stateid); 546 if (rc) 547 goto out_err_free; 548 549 /* fh */ 550 rc = -EIO; 551 p = xdr_inline_decode(&stream, 4); 552 if (!p) 553 goto out_err_free; 554 fh_count = be32_to_cpup(p); 555 556 dss_info->fh_versions = 557 kcalloc(fh_count, sizeof(struct nfs_fh), 558 gfp_flags); 559 if (dss_info->fh_versions == NULL) { 560 rc = -ENOMEM; 561 goto out_err_free; 562 } 563 564 for (j = 0; j < fh_count; j++) { 565 rc = decode_nfs_fh(&stream, 566 &dss_info->fh_versions[j]); 567 if (rc) 568 goto out_err_free; 569 } 570 571 dss_info->fh_versions_cnt = fh_count; 572 573 /* user */ 574 rc = decode_name(&stream, &id); 575 if (rc) 576 goto out_err_free; 577 578 uid = make_kuid(&init_user_ns, id); 579 580 /* group */ 581 rc = decode_name(&stream, &id); 582 if (rc) 583 goto out_err_free; 584 585 gid = make_kgid(&init_user_ns, id); 586 587 if (gfp_flags & __GFP_FS) 588 kcred = prepare_kernel_cred(&init_task); 589 else { 590 unsigned int nofs_flags = memalloc_nofs_save(); 591 592 kcred = prepare_kernel_cred(&init_task); 593 memalloc_nofs_restore(nofs_flags); 594 } 595 rc = -ENOMEM; 596 if (!kcred) 597 goto out_err_free; 598 kcred->fsuid = uid; 599 kcred->fsgid = gid; 600 cred = RCU_INITIALIZER(kcred); 601 602 if (lgr->range.iomode == IOMODE_READ) 603 rcu_assign_pointer(dss_info->ro_cred, cred); 604 else 605 rcu_assign_pointer(dss_info->rw_cred, cred); 606 } 607 608 mirror = ff_layout_add_mirror(lh, fls->mirror_array[i]); 609 if (mirror != fls->mirror_array[i]) { 610 for (dss_id = 0; dss_id < dss_count; dss_id++) { 611 dss_info = &fls->mirror_array[i]->dss[dss_id]; 612 /* swap cred ptrs so free_mirror will clean up old */ 613 if (lgr->range.iomode == IOMODE_READ) { 614 cred = xchg(&mirror->dss[dss_id].ro_cred, 615 dss_info->ro_cred); 616 rcu_assign_pointer(dss_info->ro_cred, cred); 617 } else { 618 cred = xchg(&mirror->dss[dss_id].rw_cred, 619 dss_info->rw_cred); 620 rcu_assign_pointer(dss_info->rw_cred, cred); 621 } 622 } 623 ff_layout_free_mirror(fls->mirror_array[i]); 624 fls->mirror_array[i] = mirror; 625 } 626 627 dprintk("%s: iomode %s uid %u gid %u\n", __func__, 628 lgr->range.iomode == IOMODE_READ ? "READ" : "RW", 629 from_kuid(&init_user_ns, uid), 630 from_kgid(&init_user_ns, gid)); 631 } 632 633 p = xdr_inline_decode(&stream, 4); 634 if (!p) 635 goto out_sort_mirrors; 636 fls->flags = be32_to_cpup(p); 637 638 p = xdr_inline_decode(&stream, 4); 639 if (!p) 640 goto out_sort_mirrors; 641 for (i=0; i < fls->mirror_array_cnt; i++) 642 fls->mirror_array[i]->report_interval = be32_to_cpup(p); 643 644 out_sort_mirrors: 645 ff_layout_sort_mirrors(fls); 646 ret = &fls->generic_hdr; 647 dprintk("<-- %s (success)\n", __func__); 648 out_free_page: 649 folio_put(scratch); 650 return ret; 651 out_err_free: 652 _ff_layout_free_lseg(fls); 653 ret = ERR_PTR(rc); 654 dprintk("<-- %s (%d)\n", __func__, rc); 655 goto out_free_page; 656 } 657 658 static void 659 ff_layout_free_lseg(struct pnfs_layout_segment *lseg) 660 { 661 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 662 663 dprintk("--> %s\n", __func__); 664 665 if (lseg->pls_range.iomode == IOMODE_RW) { 666 struct nfs4_flexfile_layout *ffl; 667 struct inode *inode; 668 669 ffl = FF_LAYOUT_FROM_HDR(lseg->pls_layout); 670 inode = ffl->generic_hdr.plh_inode; 671 spin_lock(&inode->i_lock); 672 pnfs_generic_ds_cinfo_release_lseg(&ffl->commit_info, lseg); 673 spin_unlock(&inode->i_lock); 674 } 675 _ff_layout_free_lseg(fls); 676 } 677 678 static u32 calc_commit_idx(struct pnfs_layout_segment *lseg, 679 u32 mirror_idx, u32 dss_id) 680 { 681 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 682 683 return (mirror_idx * flseg->mirror_array[0]->dss_count) + dss_id; 684 } 685 686 static u32 calc_mirror_idx_from_commit(struct pnfs_layout_segment *lseg, 687 u32 commit_index) 688 { 689 return commit_index / FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count; 690 } 691 692 static u32 calc_dss_id_from_commit(struct pnfs_layout_segment *lseg, 693 u32 commit_index) 694 { 695 return commit_index % FF_LAYOUT_LSEG(lseg)->mirror_array[0]->dss_count; 696 } 697 698 static void 699 nfs4_ff_start_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 700 { 701 /* first IO request? */ 702 if (atomic_inc_return(&timer->n_ops) == 1) { 703 timer->start_time = now; 704 } 705 } 706 707 static ktime_t 708 nfs4_ff_end_busy_timer(struct nfs4_ff_busy_timer *timer, ktime_t now) 709 { 710 ktime_t start; 711 712 if (atomic_dec_return(&timer->n_ops) < 0) 713 WARN_ON_ONCE(1); 714 715 start = timer->start_time; 716 timer->start_time = now; 717 return ktime_sub(now, start); 718 } 719 720 static bool 721 nfs4_ff_layoutstat_start_io(struct nfs4_ff_layout_mirror *mirror, 722 u32 dss_id, 723 struct nfs4_ff_layoutstat *layoutstat, 724 ktime_t now) 725 { 726 s64 report_interval = FF_LAYOUTSTATS_REPORT_INTERVAL; 727 struct nfs4_flexfile_layout *ffl = FF_LAYOUT_FROM_HDR(mirror->layout); 728 729 nfs4_ff_start_busy_timer(&layoutstat->busy_timer, now); 730 if (!mirror->dss[dss_id].start_time) 731 mirror->dss[dss_id].start_time = now; 732 if (mirror->report_interval != 0) 733 report_interval = (s64)mirror->report_interval * 1000LL; 734 else if (layoutstats_timer != 0) 735 report_interval = (s64)layoutstats_timer * 1000LL; 736 if (ktime_to_ms(ktime_sub(now, ffl->last_report_time)) >= 737 report_interval) { 738 ffl->last_report_time = now; 739 return true; 740 } 741 742 return false; 743 } 744 745 static void 746 nfs4_ff_layout_stat_io_update_requested(struct nfs4_ff_layoutstat *layoutstat, 747 __u64 requested) 748 { 749 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 750 751 iostat->ops_requested++; 752 iostat->bytes_requested += requested; 753 } 754 755 static void 756 nfs4_ff_layout_stat_io_update_completed(struct nfs4_ff_layoutstat *layoutstat, 757 __u64 requested, 758 __u64 completed, 759 ktime_t time_completed, 760 ktime_t time_started) 761 { 762 struct nfs4_ff_io_stat *iostat = &layoutstat->io_stat; 763 ktime_t completion_time = ktime_sub(time_completed, time_started); 764 ktime_t timer; 765 766 iostat->ops_completed++; 767 iostat->bytes_completed += completed; 768 iostat->bytes_not_delivered += requested - completed; 769 770 timer = nfs4_ff_end_busy_timer(&layoutstat->busy_timer, time_completed); 771 iostat->total_busy_time = 772 ktime_add(iostat->total_busy_time, timer); 773 iostat->aggregate_completion_time = 774 ktime_add(iostat->aggregate_completion_time, 775 completion_time); 776 } 777 778 static void 779 nfs4_ff_layout_stat_io_start_read(struct inode *inode, 780 struct nfs4_ff_layout_mirror *mirror, 781 u32 dss_id, 782 __u64 requested, ktime_t now) 783 { 784 bool report; 785 786 spin_lock(&mirror->lock); 787 report = nfs4_ff_layoutstat_start_io( 788 mirror, dss_id, &mirror->dss[dss_id].read_stat, now); 789 nfs4_ff_layout_stat_io_update_requested( 790 &mirror->dss[dss_id].read_stat, requested); 791 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 792 spin_unlock(&mirror->lock); 793 794 if (report) 795 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 796 } 797 798 static void 799 nfs4_ff_layout_stat_io_end_read(struct rpc_task *task, 800 struct nfs4_ff_layout_mirror *mirror, 801 u32 dss_id, 802 __u64 requested, 803 __u64 completed) 804 { 805 spin_lock(&mirror->lock); 806 nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].read_stat, 807 requested, completed, 808 ktime_get(), task->tk_start); 809 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 810 spin_unlock(&mirror->lock); 811 } 812 813 static void 814 nfs4_ff_layout_stat_io_start_write(struct inode *inode, 815 struct nfs4_ff_layout_mirror *mirror, 816 u32 dss_id, 817 __u64 requested, ktime_t now) 818 { 819 bool report; 820 821 spin_lock(&mirror->lock); 822 report = nfs4_ff_layoutstat_start_io( 823 mirror, 824 dss_id, 825 &mirror->dss[dss_id].write_stat, 826 now); 827 nfs4_ff_layout_stat_io_update_requested( 828 &mirror->dss[dss_id].write_stat, 829 requested); 830 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 831 spin_unlock(&mirror->lock); 832 833 if (report) 834 pnfs_report_layoutstat(inode, nfs_io_gfp_mask()); 835 } 836 837 static void 838 nfs4_ff_layout_stat_io_end_write(struct rpc_task *task, 839 struct nfs4_ff_layout_mirror *mirror, 840 u32 dss_id, 841 __u64 requested, 842 __u64 completed, 843 enum nfs3_stable_how committed) 844 { 845 if (committed == NFS_UNSTABLE) 846 requested = completed = 0; 847 848 spin_lock(&mirror->lock); 849 nfs4_ff_layout_stat_io_update_completed(&mirror->dss[dss_id].write_stat, 850 requested, completed, ktime_get(), task->tk_start); 851 set_bit(NFS4_FF_MIRROR_STAT_AVAIL, &mirror->flags); 852 spin_unlock(&mirror->lock); 853 } 854 855 static void 856 ff_layout_mark_ds_unreachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id) 857 { 858 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 859 860 if (devid) 861 nfs4_mark_deviceid_unavailable(devid); 862 } 863 864 static void 865 ff_layout_mark_ds_reachable(struct pnfs_layout_segment *lseg, u32 idx, u32 dss_id) 866 { 867 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 868 869 if (devid) 870 nfs4_mark_deviceid_available(devid); 871 } 872 873 static struct nfs4_pnfs_ds * 874 ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, 875 u32 start_idx, u32 *best_idx, 876 u32 offset, u32 *dss_id, 877 bool check_device) 878 { 879 struct nfs4_ff_layout_segment *fls = FF_LAYOUT_LSEG(lseg); 880 struct nfs4_ff_layout_mirror *mirror; 881 struct nfs4_pnfs_ds *ds = ERR_PTR(-EAGAIN); 882 u32 idx; 883 884 /* mirrors are initially sorted by efficiency */ 885 for (idx = start_idx; idx < fls->mirror_array_cnt; idx++) { 886 mirror = FF_LAYOUT_COMP(lseg, idx); 887 *dss_id = nfs4_ff_layout_calc_dss_id( 888 fls->stripe_unit, 889 fls->mirror_array[idx]->dss_count, 890 offset); 891 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, *dss_id, false); 892 if (IS_ERR(ds)) 893 continue; 894 895 if (check_device && 896 nfs4_test_deviceid_unavailable(&mirror->dss[*dss_id].mirror_ds->id_node)) { 897 // reinitialize the error state in case if this is the last iteration 898 ds = ERR_PTR(-EINVAL); 899 continue; 900 } 901 902 *best_idx = idx; 903 break; 904 } 905 906 return ds; 907 } 908 909 static struct nfs4_pnfs_ds * 910 ff_layout_choose_any_ds_for_read(struct pnfs_layout_segment *lseg, 911 u32 start_idx, u32 *best_idx, 912 u32 offset, u32 *dss_id) 913 { 914 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, 915 offset, dss_id, false); 916 } 917 918 static struct nfs4_pnfs_ds * 919 ff_layout_choose_valid_ds_for_read(struct pnfs_layout_segment *lseg, 920 u32 start_idx, u32 *best_idx, 921 u32 offset, u32 *dss_id) 922 { 923 return ff_layout_choose_ds_for_read(lseg, start_idx, best_idx, 924 offset, dss_id, true); 925 } 926 927 static struct nfs4_pnfs_ds * 928 ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, 929 u32 start_idx, u32 *best_idx, 930 u32 offset, u32 *dss_id) 931 { 932 struct nfs4_pnfs_ds *ds; 933 934 ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx, 935 offset, dss_id); 936 if (!IS_ERR(ds)) 937 return ds; 938 return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx, 939 offset, dss_id); 940 } 941 942 static struct nfs4_pnfs_ds * 943 ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, 944 u32 *best_idx, 945 u32 offset, 946 u32 *dss_id) 947 { 948 struct pnfs_layout_segment *lseg = pgio->pg_lseg; 949 struct nfs4_pnfs_ds *ds; 950 951 ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, 952 best_idx, offset, dss_id); 953 if (!IS_ERR(ds) || !pgio->pg_mirror_idx) 954 return ds; 955 return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx, 956 offset, dss_id); 957 } 958 959 static void 960 ff_layout_pg_get_read(struct nfs_pageio_descriptor *pgio, 961 struct nfs_page *req, 962 bool strict_iomode) 963 { 964 pnfs_put_lseg(pgio->pg_lseg); 965 pgio->pg_lseg = 966 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 967 req_offset(req), req->wb_bytes, IOMODE_READ, 968 strict_iomode, nfs_io_gfp_mask()); 969 if (IS_ERR(pgio->pg_lseg)) { 970 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 971 pgio->pg_lseg = NULL; 972 } 973 } 974 975 static bool 976 ff_layout_lseg_is_striped(const struct nfs4_ff_layout_segment *fls) 977 { 978 return fls->mirror_array[0]->dss_count > 1; 979 } 980 981 /* 982 * ff_layout_pg_test(). Called by nfs_can_coalesce_requests() 983 * 984 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 985 * of bytes (maximum @req->wb_bytes) that can be coalesced. 986 */ 987 static size_t 988 ff_layout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 989 struct nfs_page *req) 990 { 991 unsigned int size; 992 u64 p_stripe, r_stripe; 993 u32 stripe_offset; 994 u64 segment_offset = pgio->pg_lseg->pls_range.offset; 995 u32 stripe_unit = FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit; 996 997 /* calls nfs_generic_pg_test */ 998 size = pnfs_generic_pg_test(pgio, prev, req); 999 if (!size) 1000 return 0; 1001 else if (!ff_layout_lseg_is_striped(FF_LAYOUT_LSEG(pgio->pg_lseg))) 1002 return size; 1003 1004 /* see if req and prev are in the same stripe */ 1005 if (prev) { 1006 p_stripe = (u64)req_offset(prev) - segment_offset; 1007 r_stripe = (u64)req_offset(req) - segment_offset; 1008 do_div(p_stripe, stripe_unit); 1009 do_div(r_stripe, stripe_unit); 1010 1011 if (p_stripe != r_stripe) 1012 return 0; 1013 } 1014 1015 /* calculate remaining bytes in the current stripe */ 1016 div_u64_rem((u64)req_offset(req) - segment_offset, 1017 stripe_unit, 1018 &stripe_offset); 1019 WARN_ON_ONCE(stripe_offset > stripe_unit); 1020 if (stripe_offset >= stripe_unit) 1021 return 0; 1022 return min(stripe_unit - (unsigned int)stripe_offset, size); 1023 } 1024 1025 static void 1026 ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, 1027 struct nfs_page *req) 1028 { 1029 struct nfs_pgio_mirror *pgm; 1030 struct nfs4_ff_layout_mirror *mirror; 1031 struct nfs4_pnfs_ds *ds; 1032 u32 ds_idx, dss_id; 1033 1034 if (NFS_SERVER(pgio->pg_inode)->flags & 1035 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 1036 pgio->pg_maxretrans = io_maxretrans; 1037 retry: 1038 pnfs_generic_pg_check_layout(pgio, req); 1039 /* Use full layout for now */ 1040 if (!pgio->pg_lseg) { 1041 ff_layout_pg_get_read(pgio, req, false); 1042 if (!pgio->pg_lseg) 1043 goto out_nolseg; 1044 } 1045 if (ff_layout_avoid_read_on_rw(pgio->pg_lseg)) { 1046 ff_layout_pg_get_read(pgio, req, true); 1047 if (!pgio->pg_lseg) 1048 goto out_nolseg; 1049 } 1050 /* Reset wb_nio, since getting layout segment was successful */ 1051 req->wb_nio = 0; 1052 1053 ds = ff_layout_get_ds_for_read(pgio, &ds_idx, 1054 req_offset(req), &dss_id); 1055 if (IS_ERR(ds)) { 1056 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 1057 goto out_mds; 1058 pnfs_generic_pg_cleanup(pgio); 1059 /* Sleep for 1 second before retrying */ 1060 ssleep(1); 1061 goto retry; 1062 } 1063 1064 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, ds_idx); 1065 pgm = &pgio->pg_mirrors[0]; 1066 pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].rsize; 1067 1068 pgio->pg_mirror_idx = ds_idx; 1069 return; 1070 out_nolseg: 1071 if (pgio->pg_error < 0) { 1072 if (pgio->pg_error != -EAGAIN) 1073 return; 1074 /* Retry getting layout segment if lower layer returned -EAGAIN */ 1075 if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) { 1076 if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR) 1077 pgio->pg_error = -ETIMEDOUT; 1078 else 1079 pgio->pg_error = -EIO; 1080 return; 1081 } 1082 pgio->pg_error = 0; 1083 /* Sleep for 1 second before retrying */ 1084 ssleep(1); 1085 goto retry; 1086 } 1087 out_mds: 1088 trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode, 1089 0, NFS4_MAX_UINT64, IOMODE_READ, 1090 NFS_I(pgio->pg_inode)->layout, 1091 pgio->pg_lseg); 1092 pgio->pg_maxretrans = 0; 1093 nfs_pageio_reset_read_mds(pgio); 1094 } 1095 1096 static void 1097 ff_layout_pg_init_write(struct nfs_pageio_descriptor *pgio, 1098 struct nfs_page *req) 1099 { 1100 struct nfs4_ff_layout_mirror *mirror; 1101 struct nfs_pgio_mirror *pgm; 1102 struct nfs4_pnfs_ds *ds; 1103 u32 i, dss_id; 1104 1105 retry: 1106 pnfs_generic_pg_check_layout(pgio, req); 1107 if (!pgio->pg_lseg) { 1108 pgio->pg_lseg = 1109 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 1110 req_offset(req), req->wb_bytes, 1111 IOMODE_RW, false, nfs_io_gfp_mask()); 1112 if (IS_ERR(pgio->pg_lseg)) { 1113 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1114 pgio->pg_lseg = NULL; 1115 return; 1116 } 1117 } 1118 /* If no lseg, fall back to write through mds */ 1119 if (pgio->pg_lseg == NULL) 1120 goto out_mds; 1121 1122 /* Use a direct mapping of ds_idx to pgio mirror_idx */ 1123 if (pgio->pg_mirror_count != FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg)) 1124 goto out_eagain; 1125 1126 for (i = 0; i < pgio->pg_mirror_count; i++) { 1127 mirror = FF_LAYOUT_COMP(pgio->pg_lseg, i); 1128 dss_id = nfs4_ff_layout_calc_dss_id( 1129 FF_LAYOUT_LSEG(pgio->pg_lseg)->stripe_unit, 1130 mirror->dss_count, 1131 req_offset(req)); 1132 ds = nfs4_ff_layout_prepare_ds(pgio->pg_lseg, mirror, 1133 dss_id, true); 1134 if (IS_ERR(ds)) { 1135 if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) 1136 goto out_mds; 1137 pnfs_generic_pg_cleanup(pgio); 1138 /* Sleep for 1 second before retrying */ 1139 ssleep(1); 1140 goto retry; 1141 } 1142 pgm = &pgio->pg_mirrors[i]; 1143 pgm->pg_bsize = mirror->dss[dss_id].mirror_ds->ds_versions[0].wsize; 1144 } 1145 1146 if (NFS_SERVER(pgio->pg_inode)->flags & 1147 (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR)) 1148 pgio->pg_maxretrans = io_maxretrans; 1149 return; 1150 out_eagain: 1151 pnfs_generic_pg_cleanup(pgio); 1152 pgio->pg_error = -EAGAIN; 1153 return; 1154 out_mds: 1155 trace_pnfs_mds_fallback_pg_init_write(pgio->pg_inode, 1156 0, NFS4_MAX_UINT64, IOMODE_RW, 1157 NFS_I(pgio->pg_inode)->layout, 1158 pgio->pg_lseg); 1159 pgio->pg_maxretrans = 0; 1160 nfs_pageio_reset_write_mds(pgio); 1161 pgio->pg_error = -EAGAIN; 1162 } 1163 1164 static unsigned int 1165 ff_layout_pg_get_mirror_count_write(struct nfs_pageio_descriptor *pgio, 1166 struct nfs_page *req) 1167 { 1168 if (!pgio->pg_lseg) { 1169 pgio->pg_lseg = 1170 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 1171 req_offset(req), req->wb_bytes, 1172 IOMODE_RW, false, nfs_io_gfp_mask()); 1173 if (IS_ERR(pgio->pg_lseg)) { 1174 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 1175 pgio->pg_lseg = NULL; 1176 goto out; 1177 } 1178 } 1179 if (pgio->pg_lseg) 1180 return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg); 1181 1182 trace_pnfs_mds_fallback_pg_get_mirror_count(pgio->pg_inode, 1183 0, NFS4_MAX_UINT64, IOMODE_RW, 1184 NFS_I(pgio->pg_inode)->layout, 1185 pgio->pg_lseg); 1186 /* no lseg means that pnfs is not in use, so no mirroring here */ 1187 nfs_pageio_reset_write_mds(pgio); 1188 out: 1189 return 1; 1190 } 1191 1192 static u32 1193 ff_layout_pg_set_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 1194 { 1195 u32 old = desc->pg_mirror_idx; 1196 1197 desc->pg_mirror_idx = idx; 1198 return old; 1199 } 1200 1201 static struct nfs_pgio_mirror * 1202 ff_layout_pg_get_mirror_write(struct nfs_pageio_descriptor *desc, u32 idx) 1203 { 1204 return &desc->pg_mirrors[idx]; 1205 } 1206 1207 static const struct nfs_pageio_ops ff_layout_pg_read_ops = { 1208 .pg_init = ff_layout_pg_init_read, 1209 .pg_test = ff_layout_pg_test, 1210 .pg_doio = pnfs_generic_pg_readpages, 1211 .pg_cleanup = pnfs_generic_pg_cleanup, 1212 }; 1213 1214 static const struct nfs_pageio_ops ff_layout_pg_write_ops = { 1215 .pg_init = ff_layout_pg_init_write, 1216 .pg_test = ff_layout_pg_test, 1217 .pg_doio = pnfs_generic_pg_writepages, 1218 .pg_get_mirror_count = ff_layout_pg_get_mirror_count_write, 1219 .pg_cleanup = pnfs_generic_pg_cleanup, 1220 .pg_get_mirror = ff_layout_pg_get_mirror_write, 1221 .pg_set_mirror = ff_layout_pg_set_mirror_write, 1222 }; 1223 1224 static void ff_layout_reset_write(struct nfs_pgio_header *hdr, bool retry_pnfs) 1225 { 1226 struct rpc_task *task = &hdr->task; 1227 1228 pnfs_layoutcommit_inode(hdr->inode, false); 1229 1230 if (retry_pnfs) { 1231 dprintk("%s Reset task %5u for i/o through pNFS " 1232 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1233 hdr->task.tk_pid, 1234 hdr->inode->i_sb->s_id, 1235 (unsigned long long)NFS_FILEID(hdr->inode), 1236 hdr->args.count, 1237 (unsigned long long)hdr->args.offset); 1238 1239 hdr->completion_ops->reschedule_io(hdr); 1240 return; 1241 } 1242 1243 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1244 dprintk("%s Reset task %5u for i/o through MDS " 1245 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1246 hdr->task.tk_pid, 1247 hdr->inode->i_sb->s_id, 1248 (unsigned long long)NFS_FILEID(hdr->inode), 1249 hdr->args.count, 1250 (unsigned long long)hdr->args.offset); 1251 1252 trace_pnfs_mds_fallback_write_done(hdr->inode, 1253 hdr->args.offset, hdr->args.count, 1254 IOMODE_RW, NFS_I(hdr->inode)->layout, 1255 hdr->lseg); 1256 task->tk_status = pnfs_write_done_resend_to_mds(hdr); 1257 } 1258 } 1259 1260 static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) 1261 { 1262 u32 idx = hdr->pgio_mirror_idx + 1; 1263 u32 new_idx = 0; 1264 u32 dss_id = 0; 1265 struct nfs4_pnfs_ds *ds; 1266 1267 ds = ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx, 1268 hdr->args.offset, &dss_id); 1269 if (IS_ERR(ds)) 1270 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1271 else 1272 ff_layout_send_layouterror(hdr->lseg); 1273 pnfs_read_resend_pnfs(hdr, new_idx); 1274 } 1275 1276 static void ff_layout_reset_read(struct nfs_pgio_header *hdr) 1277 { 1278 struct rpc_task *task = &hdr->task; 1279 1280 pnfs_layoutcommit_inode(hdr->inode, false); 1281 pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); 1282 1283 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1284 dprintk("%s Reset task %5u for i/o through MDS " 1285 "(req %s/%llu, %u bytes @ offset %llu)\n", __func__, 1286 hdr->task.tk_pid, 1287 hdr->inode->i_sb->s_id, 1288 (unsigned long long)NFS_FILEID(hdr->inode), 1289 hdr->args.count, 1290 (unsigned long long)hdr->args.offset); 1291 1292 trace_pnfs_mds_fallback_read_done(hdr->inode, 1293 hdr->args.offset, hdr->args.count, 1294 IOMODE_READ, NFS_I(hdr->inode)->layout, 1295 hdr->lseg); 1296 task->tk_status = pnfs_read_done_resend_to_mds(hdr); 1297 } 1298 } 1299 1300 static int ff_layout_async_handle_error_v4(struct rpc_task *task, 1301 u32 op_status, 1302 struct nfs4_state *state, 1303 struct nfs_client *clp, 1304 struct pnfs_layout_segment *lseg, 1305 u32 idx, u32 dss_id) 1306 { 1307 struct pnfs_layout_hdr *lo = lseg->pls_layout; 1308 struct inode *inode = lo->plh_inode; 1309 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 1310 struct nfs4_slot_table *tbl = &clp->cl_session->fc_slot_table; 1311 1312 switch (op_status) { 1313 case NFS4_OK: 1314 case NFS4ERR_NXIO: 1315 break; 1316 case NFSERR_PERM: 1317 if (!task->tk_xprt) 1318 break; 1319 xprt_force_disconnect(task->tk_xprt); 1320 goto out_retry; 1321 case NFS4ERR_BADSESSION: 1322 case NFS4ERR_BADSLOT: 1323 case NFS4ERR_BAD_HIGH_SLOT: 1324 case NFS4ERR_DEADSESSION: 1325 case NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1326 case NFS4ERR_SEQ_FALSE_RETRY: 1327 case NFS4ERR_SEQ_MISORDERED: 1328 dprintk("%s ERROR %d, Reset session. Exchangeid " 1329 "flags 0x%x\n", __func__, task->tk_status, 1330 clp->cl_exchange_flags); 1331 nfs4_schedule_session_recovery(clp->cl_session, task->tk_status); 1332 goto out_retry; 1333 case NFS4ERR_DELAY: 1334 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1335 fallthrough; 1336 case NFS4ERR_GRACE: 1337 rpc_delay(task, FF_LAYOUT_POLL_RETRY_MAX); 1338 goto out_retry; 1339 case NFS4ERR_RETRY_UNCACHED_REP: 1340 goto out_retry; 1341 /* Invalidate Layout errors */ 1342 case NFS4ERR_PNFS_NO_LAYOUT: 1343 case NFS4ERR_STALE: 1344 case NFS4ERR_BADHANDLE: 1345 case NFS4ERR_ISDIR: 1346 case NFS4ERR_FHEXPIRED: 1347 case NFS4ERR_WRONG_TYPE: 1348 dprintk("%s Invalid layout error %d\n", __func__, 1349 task->tk_status); 1350 /* 1351 * Destroy layout so new i/o will get a new layout. 1352 * Layout will not be destroyed until all current lseg 1353 * references are put. Mark layout as invalid to resend failed 1354 * i/o and all i/o waiting on the slot table to the MDS until 1355 * layout is destroyed and a new valid layout is obtained. 1356 */ 1357 pnfs_destroy_layout(NFS_I(inode)); 1358 rpc_wake_up(&tbl->slot_tbl_waitq); 1359 goto reset; 1360 default: 1361 break; 1362 } 1363 1364 switch (task->tk_status) { 1365 /* RPC connection errors */ 1366 case -ENETDOWN: 1367 case -ENETUNREACH: 1368 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 1369 return -NFS4ERR_FATAL_IOERROR; 1370 fallthrough; 1371 case -ECONNREFUSED: 1372 case -EHOSTDOWN: 1373 case -EHOSTUNREACH: 1374 case -EIO: 1375 case -ETIMEDOUT: 1376 case -EPIPE: 1377 case -EPROTO: 1378 case -ENODEV: 1379 dprintk("%s DS connection error %d\n", __func__, 1380 task->tk_status); 1381 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1382 &devid->deviceid); 1383 rpc_wake_up(&tbl->slot_tbl_waitq); 1384 break; 1385 default: 1386 break; 1387 } 1388 1389 if (ff_layout_avoid_mds_available_ds(lseg)) 1390 return -NFS4ERR_RESET_TO_PNFS; 1391 reset: 1392 dprintk("%s Retry through MDS. Error %d\n", __func__, 1393 task->tk_status); 1394 return -NFS4ERR_RESET_TO_MDS; 1395 1396 out_retry: 1397 task->tk_status = 0; 1398 return -EAGAIN; 1399 } 1400 1401 /* Retry all errors through either pNFS or MDS except for -EJUKEBOX */ 1402 static int ff_layout_async_handle_error_v3(struct rpc_task *task, 1403 u32 op_status, 1404 struct nfs_client *clp, 1405 struct pnfs_layout_segment *lseg, 1406 u32 idx, u32 dss_id) 1407 { 1408 struct nfs4_deviceid_node *devid = FF_LAYOUT_DEVID_NODE(lseg, idx, dss_id); 1409 1410 switch (op_status) { 1411 case NFS_OK: 1412 case NFSERR_NXIO: 1413 break; 1414 case NFSERR_PERM: 1415 if (!task->tk_xprt) 1416 break; 1417 xprt_force_disconnect(task->tk_xprt); 1418 goto out_retry; 1419 case NFSERR_ACCES: 1420 case NFSERR_BADHANDLE: 1421 case NFSERR_FBIG: 1422 case NFSERR_IO: 1423 case NFSERR_NOSPC: 1424 case NFSERR_ROFS: 1425 case NFSERR_STALE: 1426 goto out_reset_to_pnfs; 1427 case NFSERR_JUKEBOX: 1428 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1429 goto out_retry; 1430 default: 1431 break; 1432 } 1433 1434 switch (task->tk_status) { 1435 /* File access problems. Don't mark the device as unavailable */ 1436 case -EACCES: 1437 case -ESTALE: 1438 case -EISDIR: 1439 case -EBADHANDLE: 1440 case -ELOOP: 1441 case -ENOSPC: 1442 break; 1443 case -EJUKEBOX: 1444 nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY); 1445 goto out_retry; 1446 case -ENETDOWN: 1447 case -ENETUNREACH: 1448 if (test_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags)) 1449 return -NFS4ERR_FATAL_IOERROR; 1450 fallthrough; 1451 default: 1452 dprintk("%s DS connection error %d\n", __func__, 1453 task->tk_status); 1454 nfs4_delete_deviceid(devid->ld, devid->nfs_client, 1455 &devid->deviceid); 1456 } 1457 out_reset_to_pnfs: 1458 /* FIXME: Need to prevent infinite looping here. */ 1459 return -NFS4ERR_RESET_TO_PNFS; 1460 out_retry: 1461 task->tk_status = 0; 1462 rpc_restart_call_prepare(task); 1463 rpc_delay(task, NFS_JUKEBOX_RETRY_TIME); 1464 return -EAGAIN; 1465 } 1466 1467 static int ff_layout_async_handle_error(struct rpc_task *task, 1468 u32 op_status, 1469 struct nfs4_state *state, 1470 struct nfs_client *clp, 1471 struct pnfs_layout_segment *lseg, 1472 u32 idx, u32 dss_id) 1473 { 1474 int vers = clp->cl_nfs_mod->rpc_vers->number; 1475 1476 if (task->tk_status >= 0) { 1477 ff_layout_mark_ds_reachable(lseg, idx, dss_id); 1478 return 0; 1479 } 1480 1481 /* Handle the case of an invalid layout segment */ 1482 if (!pnfs_is_valid_lseg(lseg)) 1483 return -NFS4ERR_RESET_TO_PNFS; 1484 1485 switch (vers) { 1486 case 3: 1487 return ff_layout_async_handle_error_v3(task, op_status, clp, 1488 lseg, idx, dss_id); 1489 case 4: 1490 return ff_layout_async_handle_error_v4(task, op_status, state, 1491 clp, lseg, idx, dss_id); 1492 default: 1493 /* should never happen */ 1494 WARN_ON_ONCE(1); 1495 return 0; 1496 } 1497 } 1498 1499 static void ff_layout_io_track_ds_error(struct pnfs_layout_segment *lseg, 1500 u32 idx, u32 dss_id, u64 offset, u64 length, 1501 u32 *op_status, int opnum, int error) 1502 { 1503 struct nfs4_ff_layout_mirror *mirror; 1504 u32 status = *op_status; 1505 int err; 1506 1507 if (status == 0) { 1508 switch (error) { 1509 case -ETIMEDOUT: 1510 case -EPFNOSUPPORT: 1511 case -EPROTONOSUPPORT: 1512 case -EOPNOTSUPP: 1513 case -EINVAL: 1514 case -ECONNREFUSED: 1515 case -ECONNRESET: 1516 case -EHOSTDOWN: 1517 case -EHOSTUNREACH: 1518 case -ENETDOWN: 1519 case -ENETUNREACH: 1520 case -EADDRINUSE: 1521 case -ENOBUFS: 1522 case -EPIPE: 1523 case -EPERM: 1524 case -EPROTO: 1525 case -ENODEV: 1526 *op_status = status = NFS4ERR_NXIO; 1527 break; 1528 case -EACCES: 1529 *op_status = status = NFS4ERR_ACCESS; 1530 break; 1531 default: 1532 return; 1533 } 1534 } 1535 1536 mirror = FF_LAYOUT_COMP(lseg, idx); 1537 err = ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), 1538 mirror, dss_id, offset, length, status, opnum, 1539 nfs_io_gfp_mask()); 1540 1541 switch (status) { 1542 case NFS4ERR_DELAY: 1543 case NFS4ERR_GRACE: 1544 case NFS4ERR_PERM: 1545 break; 1546 case NFS4ERR_NXIO: 1547 ff_layout_mark_ds_unreachable(lseg, idx, dss_id); 1548 /* 1549 * Don't return the layout if this is a read and we still 1550 * have layouts to try 1551 */ 1552 if (opnum == OP_READ) 1553 break; 1554 fallthrough; 1555 default: 1556 pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, 1557 lseg); 1558 } 1559 1560 dprintk("%s: err %d op %d status %u\n", __func__, err, opnum, status); 1561 } 1562 1563 /* NFS_PROTO call done callback routines */ 1564 static int ff_layout_read_done_cb(struct rpc_task *task, 1565 struct nfs_pgio_header *hdr) 1566 { 1567 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg); 1568 u32 dss_id = nfs4_ff_layout_calc_dss_id( 1569 flseg->stripe_unit, 1570 flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count, 1571 hdr->args.offset); 1572 int err; 1573 1574 if (task->tk_status < 0) { 1575 ff_layout_io_track_ds_error(hdr->lseg, 1576 hdr->pgio_mirror_idx, dss_id, 1577 hdr->args.offset, hdr->args.count, 1578 &hdr->res.op_status, OP_READ, 1579 task->tk_status); 1580 trace_ff_layout_read_error(hdr, task->tk_status); 1581 } 1582 1583 err = ff_layout_async_handle_error(task, hdr->res.op_status, 1584 hdr->args.context->state, 1585 hdr->ds_clp, hdr->lseg, 1586 hdr->pgio_mirror_idx, 1587 dss_id); 1588 1589 trace_nfs4_pnfs_read(hdr, err); 1590 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1591 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1592 switch (err) { 1593 case -NFS4ERR_RESET_TO_PNFS: 1594 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1595 return task->tk_status; 1596 case -NFS4ERR_RESET_TO_MDS: 1597 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1598 return task->tk_status; 1599 case -EAGAIN: 1600 goto out_eagain; 1601 case -NFS4ERR_FATAL_IOERROR: 1602 task->tk_status = -EIO; 1603 return 0; 1604 } 1605 1606 return 0; 1607 out_eagain: 1608 rpc_restart_call_prepare(task); 1609 return -EAGAIN; 1610 } 1611 1612 static bool 1613 ff_layout_need_layoutcommit(struct pnfs_layout_segment *lseg) 1614 { 1615 return !(FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_LAYOUTCOMMIT); 1616 } 1617 1618 /* 1619 * We reference the rpc_cred of the first WRITE that triggers the need for 1620 * a LAYOUTCOMMIT, and use it to send the layoutcommit compound. 1621 * rfc5661 is not clear about which credential should be used. 1622 * 1623 * Flexlayout client should treat DS replied FILE_SYNC as DATA_SYNC, so 1624 * to follow http://www.rfc-editor.org/errata_search.php?rfc=5661&eid=2751 1625 * we always send layoutcommit after DS writes. 1626 */ 1627 static void 1628 ff_layout_set_layoutcommit(struct inode *inode, 1629 struct pnfs_layout_segment *lseg, 1630 loff_t end_offset) 1631 { 1632 if (!ff_layout_need_layoutcommit(lseg)) 1633 return; 1634 1635 pnfs_set_layoutcommit(inode, lseg, end_offset); 1636 dprintk("%s inode %lu pls_end_pos %llu\n", __func__, inode->i_ino, 1637 (unsigned long long) NFS_I(inode)->layout->plh_lwb); 1638 } 1639 1640 static void ff_layout_read_record_layoutstats_start(struct rpc_task *task, 1641 struct nfs_pgio_header *hdr) 1642 { 1643 struct nfs4_ff_layout_mirror *mirror; 1644 u32 dss_id; 1645 1646 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1647 return; 1648 1649 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1650 dss_id = nfs4_ff_layout_calc_dss_id( 1651 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1652 mirror->dss_count, 1653 hdr->args.offset); 1654 1655 nfs4_ff_layout_stat_io_start_read( 1656 hdr->inode, 1657 mirror, 1658 dss_id, 1659 hdr->args.count, 1660 task->tk_start); 1661 } 1662 1663 static void ff_layout_read_record_layoutstats_done(struct rpc_task *task, 1664 struct nfs_pgio_header *hdr) 1665 { 1666 struct nfs4_ff_layout_mirror *mirror; 1667 u32 dss_id; 1668 1669 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1670 return; 1671 1672 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1673 dss_id = nfs4_ff_layout_calc_dss_id( 1674 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1675 mirror->dss_count, 1676 hdr->args.offset); 1677 1678 nfs4_ff_layout_stat_io_end_read( 1679 task, 1680 mirror, 1681 dss_id, 1682 hdr->args.count, 1683 hdr->res.count); 1684 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1685 } 1686 1687 static int ff_layout_read_prepare_common(struct rpc_task *task, 1688 struct nfs_pgio_header *hdr) 1689 { 1690 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1691 rpc_exit(task, -EIO); 1692 return -EIO; 1693 } 1694 1695 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1696 rpc_exit(task, -EAGAIN); 1697 return -EAGAIN; 1698 } 1699 1700 ff_layout_read_record_layoutstats_start(task, hdr); 1701 return 0; 1702 } 1703 1704 /* 1705 * Call ops for the async read/write cases 1706 * In the case of dense layouts, the offset needs to be reset to its 1707 * original value. 1708 */ 1709 static void ff_layout_read_prepare_v3(struct rpc_task *task, void *data) 1710 { 1711 struct nfs_pgio_header *hdr = data; 1712 1713 if (ff_layout_read_prepare_common(task, hdr)) 1714 return; 1715 1716 rpc_call_start(task); 1717 } 1718 1719 static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data) 1720 { 1721 struct nfs_pgio_header *hdr = data; 1722 1723 if (nfs4_setup_sequence(hdr->ds_clp, 1724 &hdr->args.seq_args, 1725 &hdr->res.seq_res, 1726 task)) 1727 return; 1728 1729 ff_layout_read_prepare_common(task, hdr); 1730 } 1731 1732 static void ff_layout_read_call_done(struct rpc_task *task, void *data) 1733 { 1734 struct nfs_pgio_header *hdr = data; 1735 1736 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1737 task->tk_status == 0) { 1738 nfs4_sequence_done(task, &hdr->res.seq_res); 1739 return; 1740 } 1741 1742 /* Note this may cause RPC to be resent */ 1743 hdr->mds_ops->rpc_call_done(task, hdr); 1744 } 1745 1746 static void ff_layout_read_count_stats(struct rpc_task *task, void *data) 1747 { 1748 struct nfs_pgio_header *hdr = data; 1749 1750 ff_layout_read_record_layoutstats_done(task, hdr); 1751 rpc_count_iostats_metrics(task, 1752 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_READ]); 1753 } 1754 1755 static void ff_layout_read_release(void *data) 1756 { 1757 struct nfs_pgio_header *hdr = data; 1758 1759 ff_layout_read_record_layoutstats_done(&hdr->task, hdr); 1760 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) 1761 ff_layout_resend_pnfs_read(hdr); 1762 else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1763 ff_layout_reset_read(hdr); 1764 pnfs_generic_rw_release(data); 1765 } 1766 1767 1768 static int ff_layout_write_done_cb(struct rpc_task *task, 1769 struct nfs_pgio_header *hdr) 1770 { 1771 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(hdr->lseg); 1772 u32 dss_id = nfs4_ff_layout_calc_dss_id( 1773 flseg->stripe_unit, 1774 flseg->mirror_array[hdr->pgio_mirror_idx]->dss_count, 1775 hdr->args.offset); 1776 loff_t end_offs = 0; 1777 int err; 1778 1779 if (task->tk_status < 0) { 1780 ff_layout_io_track_ds_error(hdr->lseg, 1781 hdr->pgio_mirror_idx, dss_id, 1782 hdr->args.offset, hdr->args.count, 1783 &hdr->res.op_status, OP_WRITE, 1784 task->tk_status); 1785 trace_ff_layout_write_error(hdr, task->tk_status); 1786 } 1787 1788 err = ff_layout_async_handle_error(task, hdr->res.op_status, 1789 hdr->args.context->state, 1790 hdr->ds_clp, hdr->lseg, 1791 hdr->pgio_mirror_idx, 1792 dss_id); 1793 1794 trace_nfs4_pnfs_write(hdr, err); 1795 clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1796 clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1797 switch (err) { 1798 case -NFS4ERR_RESET_TO_PNFS: 1799 set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags); 1800 return task->tk_status; 1801 case -NFS4ERR_RESET_TO_MDS: 1802 set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags); 1803 return task->tk_status; 1804 case -EAGAIN: 1805 return -EAGAIN; 1806 case -NFS4ERR_FATAL_IOERROR: 1807 task->tk_status = -EIO; 1808 return 0; 1809 } 1810 1811 if (hdr->res.verf->committed == NFS_FILE_SYNC || 1812 hdr->res.verf->committed == NFS_DATA_SYNC) 1813 end_offs = hdr->mds_offset + (loff_t)hdr->res.count; 1814 1815 /* Note: if the write is unstable, don't set end_offs until commit */ 1816 ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs); 1817 1818 /* zero out fattr since we don't care DS attr at all */ 1819 hdr->fattr.valid = 0; 1820 if (task->tk_status >= 0) 1821 nfs_writeback_update_inode(hdr); 1822 1823 return 0; 1824 } 1825 1826 static int ff_layout_commit_done_cb(struct rpc_task *task, 1827 struct nfs_commit_data *data) 1828 { 1829 int err; 1830 u32 idx = calc_mirror_idx_from_commit(data->lseg, data->ds_commit_index); 1831 u32 dss_id = calc_dss_id_from_commit(data->lseg, data->ds_commit_index); 1832 1833 if (task->tk_status < 0) { 1834 ff_layout_io_track_ds_error(data->lseg, idx, dss_id, 1835 data->args.offset, data->args.count, 1836 &data->res.op_status, OP_COMMIT, 1837 task->tk_status); 1838 trace_ff_layout_commit_error(data, task->tk_status); 1839 } 1840 1841 err = ff_layout_async_handle_error(task, data->res.op_status, 1842 NULL, data->ds_clp, data->lseg, idx, 1843 dss_id); 1844 1845 trace_nfs4_pnfs_commit_ds(data, err); 1846 switch (err) { 1847 case -NFS4ERR_RESET_TO_PNFS: 1848 pnfs_generic_prepare_to_resend_writes(data); 1849 return -EAGAIN; 1850 case -NFS4ERR_RESET_TO_MDS: 1851 pnfs_generic_prepare_to_resend_writes(data); 1852 return -EAGAIN; 1853 case -EAGAIN: 1854 rpc_restart_call_prepare(task); 1855 return -EAGAIN; 1856 case -NFS4ERR_FATAL_IOERROR: 1857 task->tk_status = -EIO; 1858 return 0; 1859 } 1860 1861 ff_layout_set_layoutcommit(data->inode, data->lseg, data->lwb); 1862 return 0; 1863 } 1864 1865 static void ff_layout_write_record_layoutstats_start(struct rpc_task *task, 1866 struct nfs_pgio_header *hdr) 1867 { 1868 struct nfs4_ff_layout_mirror *mirror; 1869 u32 dss_id; 1870 1871 if (test_and_set_bit(NFS_IOHDR_STAT, &hdr->flags)) 1872 return; 1873 1874 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1875 dss_id = nfs4_ff_layout_calc_dss_id( 1876 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1877 mirror->dss_count, 1878 hdr->args.offset); 1879 1880 nfs4_ff_layout_stat_io_start_write( 1881 hdr->inode, 1882 mirror, 1883 dss_id, 1884 hdr->args.count, 1885 task->tk_start); 1886 } 1887 1888 static void ff_layout_write_record_layoutstats_done(struct rpc_task *task, 1889 struct nfs_pgio_header *hdr) 1890 { 1891 struct nfs4_ff_layout_mirror *mirror; 1892 u32 dss_id; 1893 1894 if (!test_and_clear_bit(NFS_IOHDR_STAT, &hdr->flags)) 1895 return; 1896 1897 mirror = FF_LAYOUT_COMP(hdr->lseg, hdr->pgio_mirror_idx); 1898 dss_id = nfs4_ff_layout_calc_dss_id( 1899 FF_LAYOUT_LSEG(hdr->lseg)->stripe_unit, 1900 mirror->dss_count, 1901 hdr->args.offset); 1902 1903 nfs4_ff_layout_stat_io_end_write( 1904 task, 1905 mirror, 1906 dss_id, 1907 hdr->args.count, 1908 hdr->res.count, 1909 hdr->res.verf->committed); 1910 set_bit(NFS_LSEG_LAYOUTRETURN, &hdr->lseg->pls_flags); 1911 } 1912 1913 static int ff_layout_write_prepare_common(struct rpc_task *task, 1914 struct nfs_pgio_header *hdr) 1915 { 1916 if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags))) { 1917 rpc_exit(task, -EIO); 1918 return -EIO; 1919 } 1920 1921 if (!pnfs_is_valid_lseg(hdr->lseg)) { 1922 rpc_exit(task, -EAGAIN); 1923 return -EAGAIN; 1924 } 1925 1926 ff_layout_write_record_layoutstats_start(task, hdr); 1927 return 0; 1928 } 1929 1930 static void ff_layout_write_prepare_v3(struct rpc_task *task, void *data) 1931 { 1932 struct nfs_pgio_header *hdr = data; 1933 1934 if (ff_layout_write_prepare_common(task, hdr)) 1935 return; 1936 1937 rpc_call_start(task); 1938 } 1939 1940 static void ff_layout_write_prepare_v4(struct rpc_task *task, void *data) 1941 { 1942 struct nfs_pgio_header *hdr = data; 1943 1944 if (nfs4_setup_sequence(hdr->ds_clp, 1945 &hdr->args.seq_args, 1946 &hdr->res.seq_res, 1947 task)) 1948 return; 1949 1950 ff_layout_write_prepare_common(task, hdr); 1951 } 1952 1953 static void ff_layout_write_call_done(struct rpc_task *task, void *data) 1954 { 1955 struct nfs_pgio_header *hdr = data; 1956 1957 if (test_bit(NFS_IOHDR_REDO, &hdr->flags) && 1958 task->tk_status == 0) { 1959 nfs4_sequence_done(task, &hdr->res.seq_res); 1960 return; 1961 } 1962 1963 /* Note this may cause RPC to be resent */ 1964 hdr->mds_ops->rpc_call_done(task, hdr); 1965 } 1966 1967 static void ff_layout_write_count_stats(struct rpc_task *task, void *data) 1968 { 1969 struct nfs_pgio_header *hdr = data; 1970 1971 ff_layout_write_record_layoutstats_done(task, hdr); 1972 rpc_count_iostats_metrics(task, 1973 &NFS_CLIENT(hdr->inode)->cl_metrics[NFSPROC4_CLNT_WRITE]); 1974 } 1975 1976 static void ff_layout_write_release(void *data) 1977 { 1978 struct nfs_pgio_header *hdr = data; 1979 1980 ff_layout_write_record_layoutstats_done(&hdr->task, hdr); 1981 if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags)) { 1982 ff_layout_send_layouterror(hdr->lseg); 1983 ff_layout_reset_write(hdr, true); 1984 } else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags)) 1985 ff_layout_reset_write(hdr, false); 1986 pnfs_generic_rw_release(data); 1987 } 1988 1989 static void ff_layout_commit_record_layoutstats_start(struct rpc_task *task, 1990 struct nfs_commit_data *cdata) 1991 { 1992 u32 idx, dss_id; 1993 1994 if (test_and_set_bit(NFS_IOHDR_STAT, &cdata->flags)) 1995 return; 1996 1997 idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index); 1998 dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index); 1999 nfs4_ff_layout_stat_io_start_write(cdata->inode, 2000 FF_LAYOUT_COMP(cdata->lseg, idx), 2001 dss_id, 2002 0, task->tk_start); 2003 } 2004 2005 static void ff_layout_commit_record_layoutstats_done(struct rpc_task *task, 2006 struct nfs_commit_data *cdata) 2007 { 2008 struct nfs_page *req; 2009 __u64 count = 0; 2010 u32 idx, dss_id; 2011 2012 if (!test_and_clear_bit(NFS_IOHDR_STAT, &cdata->flags)) 2013 return; 2014 2015 if (task->tk_status == 0) { 2016 list_for_each_entry(req, &cdata->pages, wb_list) 2017 count += req->wb_bytes; 2018 } 2019 2020 idx = calc_mirror_idx_from_commit(cdata->lseg, cdata->ds_commit_index); 2021 dss_id = calc_dss_id_from_commit(cdata->lseg, cdata->ds_commit_index); 2022 nfs4_ff_layout_stat_io_end_write(task, 2023 FF_LAYOUT_COMP(cdata->lseg, idx), 2024 dss_id, 2025 count, count, NFS_FILE_SYNC); 2026 set_bit(NFS_LSEG_LAYOUTRETURN, &cdata->lseg->pls_flags); 2027 } 2028 2029 static int ff_layout_commit_prepare_common(struct rpc_task *task, 2030 struct nfs_commit_data *cdata) 2031 { 2032 if (!pnfs_is_valid_lseg(cdata->lseg)) { 2033 rpc_exit(task, -EAGAIN); 2034 return -EAGAIN; 2035 } 2036 2037 ff_layout_commit_record_layoutstats_start(task, cdata); 2038 return 0; 2039 } 2040 2041 static void ff_layout_commit_prepare_v3(struct rpc_task *task, void *data) 2042 { 2043 if (ff_layout_commit_prepare_common(task, data)) 2044 return; 2045 2046 rpc_call_start(task); 2047 } 2048 2049 static void ff_layout_commit_prepare_v4(struct rpc_task *task, void *data) 2050 { 2051 struct nfs_commit_data *wdata = data; 2052 2053 if (nfs4_setup_sequence(wdata->ds_clp, 2054 &wdata->args.seq_args, 2055 &wdata->res.seq_res, 2056 task)) 2057 return; 2058 ff_layout_commit_prepare_common(task, data); 2059 } 2060 2061 static void ff_layout_commit_done(struct rpc_task *task, void *data) 2062 { 2063 pnfs_generic_write_commit_done(task, data); 2064 } 2065 2066 static void ff_layout_commit_count_stats(struct rpc_task *task, void *data) 2067 { 2068 struct nfs_commit_data *cdata = data; 2069 2070 ff_layout_commit_record_layoutstats_done(task, cdata); 2071 rpc_count_iostats_metrics(task, 2072 &NFS_CLIENT(cdata->inode)->cl_metrics[NFSPROC4_CLNT_COMMIT]); 2073 } 2074 2075 static void ff_layout_commit_release(void *data) 2076 { 2077 struct nfs_commit_data *cdata = data; 2078 2079 ff_layout_commit_record_layoutstats_done(&cdata->task, cdata); 2080 pnfs_generic_commit_release(data); 2081 } 2082 2083 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = { 2084 .rpc_call_prepare = ff_layout_read_prepare_v3, 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_read_call_ops_v4 = { 2091 .rpc_call_prepare = ff_layout_read_prepare_v4, 2092 .rpc_call_done = ff_layout_read_call_done, 2093 .rpc_count_stats = ff_layout_read_count_stats, 2094 .rpc_release = ff_layout_read_release, 2095 }; 2096 2097 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = { 2098 .rpc_call_prepare = ff_layout_write_prepare_v3, 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_write_call_ops_v4 = { 2105 .rpc_call_prepare = ff_layout_write_prepare_v4, 2106 .rpc_call_done = ff_layout_write_call_done, 2107 .rpc_count_stats = ff_layout_write_count_stats, 2108 .rpc_release = ff_layout_write_release, 2109 }; 2110 2111 static const struct rpc_call_ops ff_layout_commit_call_ops_v3 = { 2112 .rpc_call_prepare = ff_layout_commit_prepare_v3, 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 const struct rpc_call_ops ff_layout_commit_call_ops_v4 = { 2119 .rpc_call_prepare = ff_layout_commit_prepare_v4, 2120 .rpc_call_done = ff_layout_commit_done, 2121 .rpc_count_stats = ff_layout_commit_count_stats, 2122 .rpc_release = ff_layout_commit_release, 2123 }; 2124 2125 static enum pnfs_try_status 2126 ff_layout_read_pagelist(struct nfs_pgio_header *hdr) 2127 { 2128 struct pnfs_layout_segment *lseg = hdr->lseg; 2129 struct nfs4_pnfs_ds *ds; 2130 struct rpc_clnt *ds_clnt; 2131 struct nfsd_file *localio; 2132 struct nfs4_ff_layout_mirror *mirror; 2133 const struct cred *ds_cred; 2134 loff_t offset = hdr->args.offset; 2135 u32 idx = hdr->pgio_mirror_idx; 2136 int vers; 2137 struct nfs_fh *fh; 2138 u32 dss_id; 2139 bool ds_fatal_error = false; 2140 2141 dprintk("--> %s ino %lu pgbase %u req %zu@%llu\n", 2142 __func__, hdr->inode->i_ino, 2143 hdr->args.pgbase, (size_t)hdr->args.count, offset); 2144 2145 mirror = FF_LAYOUT_COMP(lseg, idx); 2146 dss_id = nfs4_ff_layout_calc_dss_id( 2147 FF_LAYOUT_LSEG(lseg)->stripe_unit, 2148 mirror->dss_count, 2149 offset); 2150 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, false); 2151 if (IS_ERR(ds)) { 2152 ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds)); 2153 goto out_failed; 2154 } 2155 2156 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2157 hdr->inode, dss_id); 2158 if (IS_ERR(ds_clnt)) 2159 goto out_failed; 2160 2161 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id); 2162 if (!ds_cred) 2163 goto out_failed; 2164 2165 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2166 2167 dprintk("%s USE DS: %s cl_count %d vers %d\n", __func__, 2168 ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), vers); 2169 2170 hdr->pgio_done_cb = ff_layout_read_done_cb; 2171 refcount_inc(&ds->ds_clp->cl_count); 2172 hdr->ds_clp = ds->ds_clp; 2173 fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id); 2174 if (fh) 2175 hdr->args.fh = fh; 2176 2177 nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid); 2178 2179 /* 2180 * Note that if we ever decide to split across DSes, 2181 * then we may need to handle dense-like offsets. 2182 */ 2183 hdr->args.offset = offset; 2184 hdr->mds_offset = offset; 2185 2186 /* Start IO accounting for local read */ 2187 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2188 FMODE_READ); 2189 if (localio) { 2190 hdr->task.tk_start = ktime_get(); 2191 ff_layout_read_record_layoutstats_start(&hdr->task, hdr); 2192 } 2193 2194 /* Perform an asynchronous read to ds */ 2195 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 2196 vers == 3 ? &ff_layout_read_call_ops_v3 : 2197 &ff_layout_read_call_ops_v4, 2198 0, RPC_TASK_SOFTCONN, localio); 2199 put_cred(ds_cred); 2200 return PNFS_ATTEMPTED; 2201 2202 out_failed: 2203 if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error) 2204 return PNFS_TRY_AGAIN; 2205 trace_pnfs_mds_fallback_read_pagelist(hdr->inode, 2206 hdr->args.offset, hdr->args.count, 2207 IOMODE_READ, NFS_I(hdr->inode)->layout, lseg); 2208 return PNFS_NOT_ATTEMPTED; 2209 } 2210 2211 /* Perform async writes. */ 2212 static enum pnfs_try_status 2213 ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync) 2214 { 2215 struct pnfs_layout_segment *lseg = hdr->lseg; 2216 struct nfs4_pnfs_ds *ds; 2217 struct rpc_clnt *ds_clnt; 2218 struct nfsd_file *localio; 2219 struct nfs4_ff_layout_mirror *mirror; 2220 const struct cred *ds_cred; 2221 loff_t offset = hdr->args.offset; 2222 int vers; 2223 struct nfs_fh *fh; 2224 u32 idx = hdr->pgio_mirror_idx; 2225 u32 dss_id; 2226 bool ds_fatal_error = false; 2227 2228 mirror = FF_LAYOUT_COMP(lseg, idx); 2229 dss_id = nfs4_ff_layout_calc_dss_id( 2230 FF_LAYOUT_LSEG(lseg)->stripe_unit, 2231 mirror->dss_count, 2232 offset); 2233 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true); 2234 if (IS_ERR(ds)) { 2235 ds_fatal_error = nfs_error_is_fatal(PTR_ERR(ds)); 2236 goto out_failed; 2237 } 2238 2239 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2240 hdr->inode, dss_id); 2241 if (IS_ERR(ds_clnt)) 2242 goto out_failed; 2243 2244 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, hdr->cred, dss_id); 2245 if (!ds_cred) 2246 goto out_failed; 2247 2248 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2249 2250 dprintk("%s ino %lu sync %d req %zu@%llu DS: %s cl_count %d vers %d\n", 2251 __func__, hdr->inode->i_ino, sync, (size_t) hdr->args.count, 2252 offset, ds->ds_remotestr, refcount_read(&ds->ds_clp->cl_count), 2253 vers); 2254 2255 hdr->pgio_done_cb = ff_layout_write_done_cb; 2256 refcount_inc(&ds->ds_clp->cl_count); 2257 hdr->ds_clp = ds->ds_clp; 2258 hdr->ds_commit_idx = calc_commit_idx(lseg, idx, dss_id); 2259 fh = nfs4_ff_layout_select_ds_fh(mirror, dss_id); 2260 if (fh) 2261 hdr->args.fh = fh; 2262 2263 nfs4_ff_layout_select_ds_stateid(mirror, dss_id, &hdr->args.stateid); 2264 2265 /* 2266 * Note that if we ever decide to split across DSes, 2267 * then we may need to handle dense-like offsets. 2268 */ 2269 hdr->args.offset = offset; 2270 2271 /* Start IO accounting for local write */ 2272 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2273 FMODE_READ|FMODE_WRITE); 2274 if (localio) { 2275 hdr->task.tk_start = ktime_get(); 2276 ff_layout_write_record_layoutstats_start(&hdr->task, hdr); 2277 } 2278 2279 /* Perform an asynchronous write */ 2280 nfs_initiate_pgio(ds_clnt, hdr, ds_cred, ds->ds_clp->rpc_ops, 2281 vers == 3 ? &ff_layout_write_call_ops_v3 : 2282 &ff_layout_write_call_ops_v4, 2283 sync, RPC_TASK_SOFTCONN, localio); 2284 put_cred(ds_cred); 2285 return PNFS_ATTEMPTED; 2286 2287 out_failed: 2288 if (ff_layout_avoid_mds_available_ds(lseg) && !ds_fatal_error) 2289 return PNFS_TRY_AGAIN; 2290 trace_pnfs_mds_fallback_write_pagelist(hdr->inode, 2291 hdr->args.offset, hdr->args.count, 2292 IOMODE_RW, NFS_I(hdr->inode)->layout, lseg); 2293 return PNFS_NOT_ATTEMPTED; 2294 } 2295 2296 static struct nfs_fh * 2297 select_ds_fh_from_commit(struct pnfs_layout_segment *lseg, u32 i, u32 dss_id) 2298 { 2299 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2300 2301 /* FIXME: Assume that there is only one NFS version available 2302 * for the DS. 2303 */ 2304 return &flseg->mirror_array[i]->dss[dss_id].fh_versions[0]; 2305 } 2306 2307 static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how) 2308 { 2309 struct pnfs_layout_segment *lseg = data->lseg; 2310 struct nfs4_pnfs_ds *ds; 2311 struct rpc_clnt *ds_clnt; 2312 struct nfsd_file *localio; 2313 struct nfs4_ff_layout_mirror *mirror; 2314 const struct cred *ds_cred; 2315 u32 idx, dss_id; 2316 int vers, ret; 2317 struct nfs_fh *fh; 2318 2319 if (!lseg || !(pnfs_is_valid_lseg(lseg) || 2320 test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags))) 2321 goto out_err; 2322 2323 idx = calc_mirror_idx_from_commit(lseg, data->ds_commit_index); 2324 mirror = FF_LAYOUT_COMP(lseg, idx); 2325 dss_id = calc_dss_id_from_commit(lseg, data->ds_commit_index); 2326 ds = nfs4_ff_layout_prepare_ds(lseg, mirror, dss_id, true); 2327 if (IS_ERR(ds)) 2328 goto out_err; 2329 2330 ds_clnt = nfs4_ff_find_or_create_ds_client(mirror, ds->ds_clp, 2331 data->inode, dss_id); 2332 if (IS_ERR(ds_clnt)) 2333 goto out_err; 2334 2335 ds_cred = ff_layout_get_ds_cred(mirror, &lseg->pls_range, data->cred, dss_id); 2336 if (!ds_cred) 2337 goto out_err; 2338 2339 vers = nfs4_ff_layout_ds_version(mirror, dss_id); 2340 2341 dprintk("%s ino %lu, how %d cl_count %d vers %d\n", __func__, 2342 data->inode->i_ino, how, refcount_read(&ds->ds_clp->cl_count), 2343 vers); 2344 data->commit_done_cb = ff_layout_commit_done_cb; 2345 data->cred = ds_cred; 2346 refcount_inc(&ds->ds_clp->cl_count); 2347 data->ds_clp = ds->ds_clp; 2348 fh = select_ds_fh_from_commit(lseg, idx, dss_id); 2349 if (fh) 2350 data->args.fh = fh; 2351 2352 /* Start IO accounting for local commit */ 2353 localio = ff_local_open_fh(lseg, idx, dss_id, ds->ds_clp, ds_cred, fh, 2354 FMODE_READ|FMODE_WRITE); 2355 if (localio) { 2356 data->task.tk_start = ktime_get(); 2357 ff_layout_commit_record_layoutstats_start(&data->task, data); 2358 } 2359 2360 ret = nfs_initiate_commit(ds_clnt, data, ds->ds_clp->rpc_ops, 2361 vers == 3 ? &ff_layout_commit_call_ops_v3 : 2362 &ff_layout_commit_call_ops_v4, 2363 how, RPC_TASK_SOFTCONN, localio); 2364 put_cred(ds_cred); 2365 return ret; 2366 out_err: 2367 pnfs_generic_prepare_to_resend_writes(data); 2368 pnfs_generic_commit_release(data); 2369 return -EAGAIN; 2370 } 2371 2372 static int 2373 ff_layout_commit_pagelist(struct inode *inode, struct list_head *mds_pages, 2374 int how, struct nfs_commit_info *cinfo) 2375 { 2376 return pnfs_generic_commit_pagelist(inode, mds_pages, how, cinfo, 2377 ff_layout_initiate_commit); 2378 } 2379 2380 static bool ff_layout_match_rw(const struct rpc_task *task, 2381 const struct nfs_pgio_header *hdr, 2382 const struct pnfs_layout_segment *lseg) 2383 { 2384 return hdr->lseg == lseg; 2385 } 2386 2387 static bool ff_layout_match_commit(const struct rpc_task *task, 2388 const struct nfs_commit_data *cdata, 2389 const struct pnfs_layout_segment *lseg) 2390 { 2391 return cdata->lseg == lseg; 2392 } 2393 2394 static bool ff_layout_match_io(const struct rpc_task *task, const void *data) 2395 { 2396 const struct rpc_call_ops *ops = task->tk_ops; 2397 2398 if (ops == &ff_layout_read_call_ops_v3 || 2399 ops == &ff_layout_read_call_ops_v4 || 2400 ops == &ff_layout_write_call_ops_v3 || 2401 ops == &ff_layout_write_call_ops_v4) 2402 return ff_layout_match_rw(task, task->tk_calldata, data); 2403 if (ops == &ff_layout_commit_call_ops_v3 || 2404 ops == &ff_layout_commit_call_ops_v4) 2405 return ff_layout_match_commit(task, task->tk_calldata, data); 2406 return false; 2407 } 2408 2409 static void ff_layout_cancel_io(struct pnfs_layout_segment *lseg) 2410 { 2411 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2412 struct nfs4_ff_layout_mirror *mirror; 2413 struct nfs4_ff_layout_ds *mirror_ds; 2414 struct nfs4_pnfs_ds *ds; 2415 struct nfs_client *ds_clp; 2416 struct rpc_clnt *clnt; 2417 u32 idx, dss_id; 2418 2419 for (idx = 0; idx < flseg->mirror_array_cnt; idx++) { 2420 mirror = flseg->mirror_array[idx]; 2421 for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { 2422 mirror_ds = mirror->dss[dss_id].mirror_ds; 2423 if (IS_ERR_OR_NULL(mirror_ds)) 2424 continue; 2425 ds = mirror->dss[dss_id].mirror_ds->ds; 2426 if (!ds) 2427 continue; 2428 ds_clp = ds->ds_clp; 2429 if (!ds_clp) 2430 continue; 2431 clnt = ds_clp->cl_rpcclient; 2432 if (!clnt) 2433 continue; 2434 if (!rpc_cancel_tasks(clnt, -EAGAIN, 2435 ff_layout_match_io, lseg)) 2436 continue; 2437 rpc_clnt_disconnect(clnt); 2438 } 2439 } 2440 } 2441 2442 static struct pnfs_ds_commit_info * 2443 ff_layout_get_ds_info(struct inode *inode) 2444 { 2445 struct pnfs_layout_hdr *layout = NFS_I(inode)->layout; 2446 2447 if (layout == NULL) 2448 return NULL; 2449 2450 return &FF_LAYOUT_FROM_HDR(layout)->commit_info; 2451 } 2452 2453 static void 2454 ff_layout_setup_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2455 struct pnfs_layout_segment *lseg) 2456 { 2457 struct nfs4_ff_layout_segment *flseg = FF_LAYOUT_LSEG(lseg); 2458 struct inode *inode = lseg->pls_layout->plh_inode; 2459 struct pnfs_commit_array *array, *new; 2460 u32 size = flseg->mirror_array_cnt * flseg->mirror_array[0]->dss_count; 2461 2462 new = pnfs_alloc_commit_array(size, 2463 nfs_io_gfp_mask()); 2464 if (new) { 2465 spin_lock(&inode->i_lock); 2466 array = pnfs_add_commit_array(fl_cinfo, new, lseg); 2467 spin_unlock(&inode->i_lock); 2468 if (array != new) 2469 pnfs_free_commit_array(new); 2470 } 2471 } 2472 2473 static void 2474 ff_layout_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, 2475 struct inode *inode) 2476 { 2477 spin_lock(&inode->i_lock); 2478 pnfs_generic_ds_cinfo_destroy(fl_cinfo); 2479 spin_unlock(&inode->i_lock); 2480 } 2481 2482 static void 2483 ff_layout_free_deviceid_node(struct nfs4_deviceid_node *d) 2484 { 2485 nfs4_ff_layout_free_deviceid(container_of(d, struct nfs4_ff_layout_ds, 2486 id_node)); 2487 } 2488 2489 static int ff_layout_encode_ioerr(struct xdr_stream *xdr, 2490 const struct nfs4_layoutreturn_args *args, 2491 const struct nfs4_flexfile_layoutreturn_args *ff_args) 2492 { 2493 __be32 *start; 2494 2495 start = xdr_reserve_space(xdr, 4); 2496 if (unlikely(!start)) 2497 return -E2BIG; 2498 2499 *start = cpu_to_be32(ff_args->num_errors); 2500 /* This assume we always return _ALL_ layouts */ 2501 return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors); 2502 } 2503 2504 static void 2505 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr, 2506 const nfs4_stateid *stateid, 2507 const struct nfs42_layoutstat_devinfo *devinfo) 2508 { 2509 __be32 *p; 2510 2511 p = xdr_reserve_space(xdr, 8 + 8); 2512 p = xdr_encode_hyper(p, devinfo->offset); 2513 p = xdr_encode_hyper(p, devinfo->length); 2514 encode_opaque_fixed(xdr, stateid->data, NFS4_STATEID_SIZE); 2515 p = xdr_reserve_space(xdr, 4*8); 2516 p = xdr_encode_hyper(p, devinfo->read_count); 2517 p = xdr_encode_hyper(p, devinfo->read_bytes); 2518 p = xdr_encode_hyper(p, devinfo->write_count); 2519 p = xdr_encode_hyper(p, devinfo->write_bytes); 2520 encode_opaque_fixed(xdr, devinfo->dev_id.data, NFS4_DEVICEID4_SIZE); 2521 } 2522 2523 static void 2524 ff_layout_encode_ff_iostat(struct xdr_stream *xdr, 2525 const nfs4_stateid *stateid, 2526 const struct nfs42_layoutstat_devinfo *devinfo) 2527 { 2528 ff_layout_encode_ff_iostat_head(xdr, stateid, devinfo); 2529 ff_layout_encode_ff_layoutupdate(xdr, devinfo, 2530 devinfo->ld_private.data); 2531 } 2532 2533 /* report nothing for now */ 2534 static void ff_layout_encode_iostats_array(struct xdr_stream *xdr, 2535 const struct nfs4_layoutreturn_args *args, 2536 struct nfs4_flexfile_layoutreturn_args *ff_args) 2537 { 2538 __be32 *p; 2539 int i; 2540 2541 p = xdr_reserve_space(xdr, 4); 2542 *p = cpu_to_be32(ff_args->num_dev); 2543 for (i = 0; i < ff_args->num_dev; i++) 2544 ff_layout_encode_ff_iostat(xdr, 2545 &args->layout->plh_stateid, 2546 &ff_args->devinfo[i]); 2547 } 2548 2549 static void 2550 ff_layout_free_iostats_array(struct nfs42_layoutstat_devinfo *devinfo, 2551 unsigned int num_entries) 2552 { 2553 unsigned int i; 2554 2555 for (i = 0; i < num_entries; i++) { 2556 if (!devinfo[i].ld_private.ops) 2557 continue; 2558 if (!devinfo[i].ld_private.ops->free) 2559 continue; 2560 devinfo[i].ld_private.ops->free(&devinfo[i].ld_private); 2561 } 2562 } 2563 2564 static struct nfs4_deviceid_node * 2565 ff_layout_alloc_deviceid_node(struct nfs_server *server, 2566 struct pnfs_device *pdev, gfp_t gfp_flags) 2567 { 2568 struct nfs4_ff_layout_ds *dsaddr; 2569 2570 dsaddr = nfs4_ff_alloc_deviceid_node(server, pdev, gfp_flags); 2571 if (!dsaddr) 2572 return NULL; 2573 return &dsaddr->id_node; 2574 } 2575 2576 static void 2577 ff_layout_encode_layoutreturn(struct xdr_stream *xdr, 2578 const void *voidargs, 2579 const struct nfs4_xdr_opaque_data *ff_opaque) 2580 { 2581 const struct nfs4_layoutreturn_args *args = voidargs; 2582 struct nfs4_flexfile_layoutreturn_args *ff_args = ff_opaque->data; 2583 struct xdr_buf tmp_buf = { 2584 .head = { 2585 [0] = { 2586 .iov_base = page_address(ff_args->pages[0]), 2587 }, 2588 }, 2589 .buflen = PAGE_SIZE, 2590 }; 2591 struct xdr_stream tmp_xdr; 2592 __be32 *start; 2593 2594 dprintk("%s: Begin\n", __func__); 2595 2596 xdr_init_encode(&tmp_xdr, &tmp_buf, NULL, NULL); 2597 2598 ff_layout_encode_ioerr(&tmp_xdr, args, ff_args); 2599 ff_layout_encode_iostats_array(&tmp_xdr, args, ff_args); 2600 2601 start = xdr_reserve_space(xdr, 4); 2602 *start = cpu_to_be32(tmp_buf.len); 2603 xdr_write_pages(xdr, ff_args->pages, 0, tmp_buf.len); 2604 2605 dprintk("%s: Return\n", __func__); 2606 } 2607 2608 static void 2609 ff_layout_free_layoutreturn(struct nfs4_xdr_opaque_data *args) 2610 { 2611 struct nfs4_flexfile_layoutreturn_args *ff_args; 2612 2613 if (!args->data) 2614 return; 2615 ff_args = args->data; 2616 args->data = NULL; 2617 2618 ff_layout_free_ds_ioerr(&ff_args->errors); 2619 ff_layout_free_iostats_array(ff_args->devinfo, ff_args->num_dev); 2620 2621 put_page(ff_args->pages[0]); 2622 kfree(ff_args); 2623 } 2624 2625 static const struct nfs4_xdr_opaque_ops layoutreturn_ops = { 2626 .encode = ff_layout_encode_layoutreturn, 2627 .free = ff_layout_free_layoutreturn, 2628 }; 2629 2630 static int 2631 ff_layout_prepare_layoutreturn(struct nfs4_layoutreturn_args *args) 2632 { 2633 struct nfs4_flexfile_layoutreturn_args *ff_args; 2634 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(args->layout); 2635 2636 ff_args = kmalloc(sizeof(*ff_args), nfs_io_gfp_mask()); 2637 if (!ff_args) 2638 goto out_nomem; 2639 ff_args->pages[0] = alloc_page(nfs_io_gfp_mask()); 2640 if (!ff_args->pages[0]) 2641 goto out_nomem_free; 2642 2643 INIT_LIST_HEAD(&ff_args->errors); 2644 ff_args->num_errors = ff_layout_fetch_ds_ioerr(args->layout, 2645 &args->range, &ff_args->errors, 2646 FF_LAYOUTRETURN_MAXERR); 2647 2648 spin_lock(&args->inode->i_lock); 2649 ff_args->num_dev = ff_layout_mirror_prepare_stats( 2650 &ff_layout->generic_hdr, &ff_args->devinfo[0], 2651 ARRAY_SIZE(ff_args->devinfo), NFS4_FF_OP_LAYOUTRETURN); 2652 spin_unlock(&args->inode->i_lock); 2653 2654 args->ld_private->ops = &layoutreturn_ops; 2655 args->ld_private->data = ff_args; 2656 return 0; 2657 out_nomem_free: 2658 kfree(ff_args); 2659 out_nomem: 2660 return -ENOMEM; 2661 } 2662 2663 #ifdef CONFIG_NFS_V4_2 2664 void 2665 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2666 { 2667 struct pnfs_layout_hdr *lo = lseg->pls_layout; 2668 struct nfs42_layout_error *errors; 2669 LIST_HEAD(head); 2670 2671 if (!nfs_server_capable(lo->plh_inode, NFS_CAP_LAYOUTERROR)) 2672 return; 2673 ff_layout_fetch_ds_ioerr(lo, &lseg->pls_range, &head, -1); 2674 if (list_empty(&head)) 2675 return; 2676 2677 errors = kmalloc_array(NFS42_LAYOUTERROR_MAX, sizeof(*errors), 2678 nfs_io_gfp_mask()); 2679 if (errors != NULL) { 2680 const struct nfs4_ff_layout_ds_err *pos; 2681 size_t n = 0; 2682 2683 list_for_each_entry(pos, &head, list) { 2684 errors[n].offset = pos->offset; 2685 errors[n].length = pos->length; 2686 nfs4_stateid_copy(&errors[n].stateid, &pos->stateid); 2687 errors[n].errors[0].dev_id = pos->deviceid; 2688 errors[n].errors[0].status = pos->status; 2689 errors[n].errors[0].opnum = pos->opnum; 2690 n++; 2691 if (!list_is_last(&pos->list, &head) && 2692 n < NFS42_LAYOUTERROR_MAX) 2693 continue; 2694 if (nfs42_proc_layouterror(lseg, errors, n) < 0) 2695 break; 2696 n = 0; 2697 } 2698 kfree(errors); 2699 } 2700 ff_layout_free_ds_ioerr(&head); 2701 } 2702 #else 2703 void 2704 ff_layout_send_layouterror(struct pnfs_layout_segment *lseg) 2705 { 2706 } 2707 #endif 2708 2709 static int 2710 ff_layout_ntop4(const struct sockaddr *sap, char *buf, const size_t buflen) 2711 { 2712 const struct sockaddr_in *sin = (struct sockaddr_in *)sap; 2713 2714 return snprintf(buf, buflen, "%pI4", &sin->sin_addr); 2715 } 2716 2717 static size_t 2718 ff_layout_ntop6_noscopeid(const struct sockaddr *sap, char *buf, 2719 const int buflen) 2720 { 2721 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 2722 const struct in6_addr *addr = &sin6->sin6_addr; 2723 2724 /* 2725 * RFC 4291, Section 2.2.2 2726 * 2727 * Shorthanded ANY address 2728 */ 2729 if (ipv6_addr_any(addr)) 2730 return snprintf(buf, buflen, "::"); 2731 2732 /* 2733 * RFC 4291, Section 2.2.2 2734 * 2735 * Shorthanded loopback address 2736 */ 2737 if (ipv6_addr_loopback(addr)) 2738 return snprintf(buf, buflen, "::1"); 2739 2740 /* 2741 * RFC 4291, Section 2.2.3 2742 * 2743 * Special presentation address format for mapped v4 2744 * addresses. 2745 */ 2746 if (ipv6_addr_v4mapped(addr)) 2747 return snprintf(buf, buflen, "::ffff:%pI4", 2748 &addr->s6_addr32[3]); 2749 2750 /* 2751 * RFC 4291, Section 2.2.1 2752 */ 2753 return snprintf(buf, buflen, "%pI6c", addr); 2754 } 2755 2756 /* Derived from rpc_sockaddr2uaddr */ 2757 static void 2758 ff_layout_encode_netaddr(struct xdr_stream *xdr, struct nfs4_pnfs_ds_addr *da) 2759 { 2760 struct sockaddr *sap = (struct sockaddr *)&da->da_addr; 2761 char portbuf[RPCBIND_MAXUADDRPLEN]; 2762 char addrbuf[RPCBIND_MAXUADDRLEN]; 2763 unsigned short port; 2764 int len, netid_len; 2765 __be32 *p; 2766 2767 switch (sap->sa_family) { 2768 case AF_INET: 2769 if (ff_layout_ntop4(sap, addrbuf, sizeof(addrbuf)) == 0) 2770 return; 2771 port = ntohs(((struct sockaddr_in *)sap)->sin_port); 2772 break; 2773 case AF_INET6: 2774 if (ff_layout_ntop6_noscopeid(sap, addrbuf, sizeof(addrbuf)) == 0) 2775 return; 2776 port = ntohs(((struct sockaddr_in6 *)sap)->sin6_port); 2777 break; 2778 default: 2779 WARN_ON_ONCE(1); 2780 return; 2781 } 2782 2783 snprintf(portbuf, sizeof(portbuf), ".%u.%u", port >> 8, port & 0xff); 2784 len = strlcat(addrbuf, portbuf, sizeof(addrbuf)); 2785 2786 netid_len = strlen(da->da_netid); 2787 p = xdr_reserve_space(xdr, 4 + netid_len); 2788 xdr_encode_opaque(p, da->da_netid, netid_len); 2789 2790 p = xdr_reserve_space(xdr, 4 + len); 2791 xdr_encode_opaque(p, addrbuf, len); 2792 } 2793 2794 static void 2795 ff_layout_encode_nfstime(struct xdr_stream *xdr, 2796 ktime_t t) 2797 { 2798 struct timespec64 ts; 2799 __be32 *p; 2800 2801 p = xdr_reserve_space(xdr, 12); 2802 ts = ktime_to_timespec64(t); 2803 p = xdr_encode_hyper(p, ts.tv_sec); 2804 *p++ = cpu_to_be32(ts.tv_nsec); 2805 } 2806 2807 static void 2808 ff_layout_encode_io_latency(struct xdr_stream *xdr, 2809 struct nfs4_ff_io_stat *stat) 2810 { 2811 __be32 *p; 2812 2813 p = xdr_reserve_space(xdr, 5 * 8); 2814 p = xdr_encode_hyper(p, stat->ops_requested); 2815 p = xdr_encode_hyper(p, stat->bytes_requested); 2816 p = xdr_encode_hyper(p, stat->ops_completed); 2817 p = xdr_encode_hyper(p, stat->bytes_completed); 2818 p = xdr_encode_hyper(p, stat->bytes_not_delivered); 2819 ff_layout_encode_nfstime(xdr, stat->total_busy_time); 2820 ff_layout_encode_nfstime(xdr, stat->aggregate_completion_time); 2821 } 2822 2823 static void 2824 ff_layout_encode_ff_layoutupdate(struct xdr_stream *xdr, 2825 const struct nfs42_layoutstat_devinfo *devinfo, 2826 struct nfs4_ff_layout_ds_stripe *dss_info) 2827 { 2828 struct nfs4_pnfs_ds_addr *da; 2829 struct nfs4_pnfs_ds *ds = dss_info->mirror_ds->ds; 2830 struct nfs_fh *fh = &dss_info->fh_versions[0]; 2831 __be32 *p; 2832 2833 da = list_first_entry(&ds->ds_addrs, struct nfs4_pnfs_ds_addr, da_node); 2834 dprintk("%s: DS %s: encoding address %s\n", 2835 __func__, ds->ds_remotestr, da->da_remotestr); 2836 /* netaddr4 */ 2837 ff_layout_encode_netaddr(xdr, da); 2838 /* nfs_fh4 */ 2839 p = xdr_reserve_space(xdr, 4 + fh->size); 2840 xdr_encode_opaque(p, fh->data, fh->size); 2841 /* ff_io_latency4 read */ 2842 spin_lock(&dss_info->mirror->lock); 2843 ff_layout_encode_io_latency(xdr, 2844 &dss_info->read_stat.io_stat); 2845 /* ff_io_latency4 write */ 2846 ff_layout_encode_io_latency(xdr, 2847 &dss_info->write_stat.io_stat); 2848 spin_unlock(&dss_info->mirror->lock); 2849 /* nfstime4 */ 2850 ff_layout_encode_nfstime(xdr, 2851 ktime_sub(ktime_get(), 2852 dss_info->start_time)); 2853 /* bool */ 2854 p = xdr_reserve_space(xdr, 4); 2855 *p = cpu_to_be32(false); 2856 } 2857 2858 static void 2859 ff_layout_encode_layoutstats(struct xdr_stream *xdr, const void *args, 2860 const struct nfs4_xdr_opaque_data *opaque) 2861 { 2862 struct nfs42_layoutstat_devinfo *devinfo = container_of(opaque, 2863 struct nfs42_layoutstat_devinfo, ld_private); 2864 __be32 *start; 2865 2866 /* layoutupdate length */ 2867 start = xdr_reserve_space(xdr, 4); 2868 ff_layout_encode_ff_layoutupdate(xdr, devinfo, opaque->data); 2869 2870 *start = cpu_to_be32((xdr->p - start - 1) * 4); 2871 } 2872 2873 static void 2874 ff_layout_free_layoutstats(struct nfs4_xdr_opaque_data *opaque) 2875 { 2876 struct nfs4_ff_layout_ds_stripe *dss_info = opaque->data; 2877 struct nfs4_ff_layout_mirror *mirror = dss_info->mirror; 2878 2879 ff_layout_put_mirror(mirror); 2880 } 2881 2882 static const struct nfs4_xdr_opaque_ops layoutstat_ops = { 2883 .encode = ff_layout_encode_layoutstats, 2884 .free = ff_layout_free_layoutstats, 2885 }; 2886 2887 static int 2888 ff_layout_mirror_prepare_stats(struct pnfs_layout_hdr *lo, 2889 struct nfs42_layoutstat_devinfo *devinfo, 2890 int dev_limit, enum nfs4_ff_op_type type) 2891 { 2892 struct nfs4_flexfile_layout *ff_layout = FF_LAYOUT_FROM_HDR(lo); 2893 struct nfs4_ff_layout_mirror *mirror; 2894 struct nfs4_ff_layout_ds_stripe *dss_info; 2895 struct nfs4_deviceid_node *dev; 2896 int i = 0, dss_id; 2897 2898 list_for_each_entry(mirror, &ff_layout->mirrors, mirrors) { 2899 for (dss_id = 0; dss_id < mirror->dss_count; ++dss_id) { 2900 dss_info = &mirror->dss[dss_id]; 2901 if (i >= dev_limit) 2902 break; 2903 if (IS_ERR_OR_NULL(dss_info->mirror_ds)) 2904 continue; 2905 if (!test_and_clear_bit(NFS4_FF_MIRROR_STAT_AVAIL, 2906 &mirror->flags) && 2907 type != NFS4_FF_OP_LAYOUTRETURN) 2908 continue; 2909 /* mirror refcount put in cleanup_layoutstats */ 2910 if (!refcount_inc_not_zero(&mirror->ref)) 2911 continue; 2912 dev = &dss_info->mirror_ds->id_node; 2913 memcpy(&devinfo->dev_id, 2914 &dev->deviceid, 2915 NFS4_DEVICEID4_SIZE); 2916 devinfo->offset = 0; 2917 devinfo->length = NFS4_MAX_UINT64; 2918 spin_lock(&mirror->lock); 2919 devinfo->read_count = 2920 dss_info->read_stat.io_stat.ops_completed; 2921 devinfo->read_bytes = 2922 dss_info->read_stat.io_stat.bytes_completed; 2923 devinfo->write_count = 2924 dss_info->write_stat.io_stat.ops_completed; 2925 devinfo->write_bytes = 2926 dss_info->write_stat.io_stat.bytes_completed; 2927 spin_unlock(&mirror->lock); 2928 devinfo->layout_type = LAYOUT_FLEX_FILES; 2929 devinfo->ld_private.ops = &layoutstat_ops; 2930 devinfo->ld_private.data = &mirror->dss[dss_id]; 2931 2932 devinfo++; 2933 i++; 2934 } 2935 } 2936 return i; 2937 } 2938 2939 static int ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args) 2940 { 2941 struct pnfs_layout_hdr *lo; 2942 struct nfs4_flexfile_layout *ff_layout; 2943 const int dev_count = PNFS_LAYOUTSTATS_MAXDEV; 2944 2945 /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */ 2946 args->devinfo = kmalloc_array(dev_count, sizeof(*args->devinfo), 2947 nfs_io_gfp_mask()); 2948 if (!args->devinfo) 2949 return -ENOMEM; 2950 2951 spin_lock(&args->inode->i_lock); 2952 lo = NFS_I(args->inode)->layout; 2953 if (lo && pnfs_layout_is_valid(lo)) { 2954 ff_layout = FF_LAYOUT_FROM_HDR(lo); 2955 args->num_dev = ff_layout_mirror_prepare_stats( 2956 &ff_layout->generic_hdr, &args->devinfo[0], dev_count, 2957 NFS4_FF_OP_LAYOUTSTATS); 2958 } else 2959 args->num_dev = 0; 2960 spin_unlock(&args->inode->i_lock); 2961 if (!args->num_dev) { 2962 kfree(args->devinfo); 2963 args->devinfo = NULL; 2964 return -ENOENT; 2965 } 2966 2967 return 0; 2968 } 2969 2970 static int 2971 ff_layout_set_layoutdriver(struct nfs_server *server, 2972 const struct nfs_fh *dummy) 2973 { 2974 #if IS_ENABLED(CONFIG_NFS_V4_2) 2975 server->caps |= NFS_CAP_LAYOUTSTATS | NFS_CAP_REBOOT_LAYOUTRETURN; 2976 #endif 2977 return 0; 2978 } 2979 2980 static const struct pnfs_commit_ops ff_layout_commit_ops = { 2981 .setup_ds_info = ff_layout_setup_ds_info, 2982 .release_ds_info = ff_layout_release_ds_info, 2983 .mark_request_commit = pnfs_layout_mark_request_commit, 2984 .clear_request_commit = pnfs_generic_clear_request_commit, 2985 .scan_commit_lists = pnfs_generic_scan_commit_lists, 2986 .recover_commit_reqs = pnfs_generic_recover_commit_reqs, 2987 .commit_pagelist = ff_layout_commit_pagelist, 2988 }; 2989 2990 static struct pnfs_layoutdriver_type flexfilelayout_type = { 2991 .id = LAYOUT_FLEX_FILES, 2992 .name = "LAYOUT_FLEX_FILES", 2993 .owner = THIS_MODULE, 2994 .flags = PNFS_LAYOUTGET_ON_OPEN, 2995 .max_layoutget_response = 4096, /* 1 page or so... */ 2996 .set_layoutdriver = ff_layout_set_layoutdriver, 2997 .alloc_layout_hdr = ff_layout_alloc_layout_hdr, 2998 .free_layout_hdr = ff_layout_free_layout_hdr, 2999 .alloc_lseg = ff_layout_alloc_lseg, 3000 .free_lseg = ff_layout_free_lseg, 3001 .add_lseg = ff_layout_add_lseg, 3002 .pg_read_ops = &ff_layout_pg_read_ops, 3003 .pg_write_ops = &ff_layout_pg_write_ops, 3004 .get_ds_info = ff_layout_get_ds_info, 3005 .free_deviceid_node = ff_layout_free_deviceid_node, 3006 .read_pagelist = ff_layout_read_pagelist, 3007 .write_pagelist = ff_layout_write_pagelist, 3008 .alloc_deviceid_node = ff_layout_alloc_deviceid_node, 3009 .prepare_layoutreturn = ff_layout_prepare_layoutreturn, 3010 .sync = pnfs_nfs_generic_sync, 3011 .prepare_layoutstats = ff_layout_prepare_layoutstats, 3012 .cancel_io = ff_layout_cancel_io, 3013 }; 3014 3015 static int __init nfs4flexfilelayout_init(void) 3016 { 3017 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Registering...\n", 3018 __func__); 3019 return pnfs_register_layoutdriver(&flexfilelayout_type); 3020 } 3021 3022 static void __exit nfs4flexfilelayout_exit(void) 3023 { 3024 printk(KERN_INFO "%s: NFSv4 Flexfile Layout Driver Unregistering...\n", 3025 __func__); 3026 pnfs_unregister_layoutdriver(&flexfilelayout_type); 3027 } 3028 3029 MODULE_ALIAS("nfs-layouttype4-4"); 3030 3031 MODULE_LICENSE("GPL"); 3032 MODULE_DESCRIPTION("The NFSv4 flexfile layout driver"); 3033 3034 module_init(nfs4flexfilelayout_init); 3035 module_exit(nfs4flexfilelayout_exit); 3036 3037 module_param(io_maxretrans, ushort, 0644); 3038 MODULE_PARM_DESC(io_maxretrans, "The number of times the NFSv4.1 client " 3039 "retries an I/O request before returning an error. "); 3040