1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014 Christoph Hellwig. 4 */ 5 #include <linux/blkdev.h> 6 #include <linux/kmod.h> 7 #include <linux/file.h> 8 #include <linux/jhash.h> 9 #include <linux/sched.h> 10 #include <linux/sunrpc/addr.h> 11 12 #include "pnfs.h" 13 #include "netns.h" 14 #include "trace.h" 15 16 #define NFSDDBG_FACILITY NFSDDBG_PNFS 17 18 struct nfs4_layout { 19 struct list_head lo_perstate; 20 struct nfs4_layout_stateid *lo_state; 21 struct nfsd4_layout_seg lo_seg; 22 }; 23 24 static struct kmem_cache *nfs4_layout_cache; 25 static struct kmem_cache *nfs4_layout_stateid_cache; 26 27 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops; 28 static const struct lock_manager_operations nfsd4_layouts_lm_ops; 29 30 const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = { 31 #ifdef CONFIG_NFSD_FLEXFILELAYOUT 32 [LAYOUT_FLEX_FILES] = &ff_layout_ops, 33 #endif 34 #ifdef CONFIG_NFSD_BLOCKLAYOUT 35 [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops, 36 #endif 37 #ifdef CONFIG_NFSD_SCSILAYOUT 38 [LAYOUT_SCSI] = &scsi_layout_ops, 39 #endif 40 }; 41 42 /* pNFS device ID to export fsid mapping */ 43 #define DEVID_HASH_BITS 8 44 #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS) 45 #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1) 46 static u64 nfsd_devid_seq = 1; 47 static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE]; 48 static DEFINE_SPINLOCK(nfsd_devid_lock); 49 50 static inline u32 devid_hashfn(u64 idx) 51 { 52 return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK; 53 } 54 55 static void 56 nfsd4_alloc_devid_map(const struct svc_fh *fhp) 57 { 58 const struct knfsd_fh *fh = &fhp->fh_handle; 59 size_t fsid_len = key_len(fh->fh_fsid_type); 60 struct nfsd4_deviceid_map *map, *old; 61 int i; 62 63 map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL); 64 if (!map) 65 return; 66 67 map->fsid_type = fh->fh_fsid_type; 68 memcpy(&map->fsid, fh->fh_fsid, fsid_len); 69 70 spin_lock(&nfsd_devid_lock); 71 if (fhp->fh_export->ex_devid_map) 72 goto out_unlock; 73 74 for (i = 0; i < DEVID_HASH_SIZE; i++) { 75 list_for_each_entry(old, &nfsd_devid_hash[i], hash) { 76 if (old->fsid_type != fh->fh_fsid_type) 77 continue; 78 if (memcmp(old->fsid, fh->fh_fsid, 79 key_len(old->fsid_type))) 80 continue; 81 82 fhp->fh_export->ex_devid_map = old; 83 goto out_unlock; 84 } 85 } 86 87 map->idx = nfsd_devid_seq++; 88 list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]); 89 fhp->fh_export->ex_devid_map = map; 90 map = NULL; 91 92 out_unlock: 93 spin_unlock(&nfsd_devid_lock); 94 kfree(map); 95 } 96 97 struct nfsd4_deviceid_map * 98 nfsd4_find_devid_map(int idx) 99 { 100 struct nfsd4_deviceid_map *map, *ret = NULL; 101 102 rcu_read_lock(); 103 list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash) 104 if (map->idx == idx) 105 ret = map; 106 rcu_read_unlock(); 107 108 return ret; 109 } 110 111 int 112 nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp, 113 u32 device_generation) 114 { 115 if (!fhp->fh_export->ex_devid_map) { 116 nfsd4_alloc_devid_map(fhp); 117 if (!fhp->fh_export->ex_devid_map) 118 return -ENOMEM; 119 } 120 121 id->fsid_idx = fhp->fh_export->ex_devid_map->idx; 122 id->generation = device_generation; 123 id->pad = 0; 124 return 0; 125 } 126 127 void nfsd4_setup_layout_type(struct svc_export *exp) 128 { 129 #if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT) 130 struct super_block *sb = exp->ex_path.mnt->mnt_sb; 131 #endif 132 133 if (!(exp->ex_flags & NFSEXP_PNFS)) 134 return; 135 136 #ifdef CONFIG_NFSD_FLEXFILELAYOUT 137 exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES; 138 #endif 139 #ifdef CONFIG_NFSD_BLOCKLAYOUT 140 if (sb->s_export_op->get_uuid && 141 sb->s_export_op->map_blocks && 142 sb->s_export_op->commit_blocks) 143 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME; 144 #endif 145 #ifdef CONFIG_NFSD_SCSILAYOUT 146 if (sb->s_export_op->map_blocks && 147 sb->s_export_op->commit_blocks && 148 sb->s_bdev && 149 sb->s_bdev->bd_disk->fops->pr_ops && 150 sb->s_bdev->bd_disk->fops->get_unique_id) 151 exp->ex_layout_types |= 1 << LAYOUT_SCSI; 152 #endif 153 } 154 155 static void 156 nfsd4_free_layout_stateid(struct nfs4_stid *stid) 157 { 158 struct nfs4_layout_stateid *ls = layoutstateid(stid); 159 struct nfs4_client *clp = ls->ls_stid.sc_client; 160 struct nfs4_file *fp = ls->ls_stid.sc_file; 161 162 trace_nfsd_layoutstate_free(&ls->ls_stid.sc_stateid); 163 164 spin_lock(&clp->cl_lock); 165 list_del_init(&ls->ls_perclnt); 166 spin_unlock(&clp->cl_lock); 167 168 spin_lock(&fp->fi_lock); 169 list_del_init(&ls->ls_perfile); 170 spin_unlock(&fp->fi_lock); 171 172 if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 173 vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls); 174 nfsd_file_put(ls->ls_file); 175 176 if (ls->ls_recalled) 177 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); 178 179 kmem_cache_free(nfs4_layout_stateid_cache, ls); 180 } 181 182 static int 183 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) 184 { 185 struct file_lock *fl; 186 int status; 187 188 if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 189 return 0; 190 191 fl = locks_alloc_lock(); 192 if (!fl) 193 return -ENOMEM; 194 locks_init_lock(fl); 195 fl->fl_lmops = &nfsd4_layouts_lm_ops; 196 fl->fl_flags = FL_LAYOUT; 197 fl->fl_type = F_RDLCK; 198 fl->fl_end = OFFSET_MAX; 199 fl->fl_owner = ls; 200 fl->fl_pid = current->tgid; 201 fl->fl_file = ls->ls_file->nf_file; 202 203 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); 204 if (status) { 205 locks_free_lock(fl); 206 return status; 207 } 208 BUG_ON(fl != NULL); 209 return 0; 210 } 211 212 static struct nfs4_layout_stateid * 213 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, 214 struct nfs4_stid *parent, u32 layout_type) 215 { 216 struct nfs4_client *clp = cstate->clp; 217 struct nfs4_file *fp = parent->sc_file; 218 struct nfs4_layout_stateid *ls; 219 struct nfs4_stid *stp; 220 221 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache, 222 nfsd4_free_layout_stateid); 223 if (!stp) 224 return NULL; 225 226 get_nfs4_file(fp); 227 stp->sc_file = fp; 228 229 ls = layoutstateid(stp); 230 INIT_LIST_HEAD(&ls->ls_perclnt); 231 INIT_LIST_HEAD(&ls->ls_perfile); 232 spin_lock_init(&ls->ls_lock); 233 INIT_LIST_HEAD(&ls->ls_layouts); 234 mutex_init(&ls->ls_mutex); 235 ls->ls_layout_type = layout_type; 236 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, 237 NFSPROC4_CLNT_CB_LAYOUT); 238 239 if (parent->sc_type == NFS4_DELEG_STID) 240 ls->ls_file = nfsd_file_get(fp->fi_deleg_file); 241 else 242 ls->ls_file = find_any_file(fp); 243 BUG_ON(!ls->ls_file); 244 245 if (nfsd4_layout_setlease(ls)) { 246 nfsd_file_put(ls->ls_file); 247 put_nfs4_file(fp); 248 kmem_cache_free(nfs4_layout_stateid_cache, ls); 249 return NULL; 250 } 251 252 spin_lock(&clp->cl_lock); 253 stp->sc_type = NFS4_LAYOUT_STID; 254 list_add(&ls->ls_perclnt, &clp->cl_lo_states); 255 spin_unlock(&clp->cl_lock); 256 257 spin_lock(&fp->fi_lock); 258 list_add(&ls->ls_perfile, &fp->fi_lo_states); 259 spin_unlock(&fp->fi_lock); 260 261 trace_nfsd_layoutstate_alloc(&ls->ls_stid.sc_stateid); 262 return ls; 263 } 264 265 __be32 266 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, 267 struct nfsd4_compound_state *cstate, stateid_t *stateid, 268 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) 269 { 270 struct nfs4_layout_stateid *ls; 271 struct nfs4_stid *stid; 272 unsigned char typemask = NFS4_LAYOUT_STID; 273 __be32 status; 274 275 if (create) 276 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); 277 278 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid, 279 net_generic(SVC_NET(rqstp), nfsd_net_id)); 280 if (status) 281 goto out; 282 283 if (!fh_match(&cstate->current_fh.fh_handle, 284 &stid->sc_file->fi_fhandle)) { 285 status = nfserr_bad_stateid; 286 goto out_put_stid; 287 } 288 289 if (stid->sc_type != NFS4_LAYOUT_STID) { 290 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type); 291 nfs4_put_stid(stid); 292 293 status = nfserr_jukebox; 294 if (!ls) 295 goto out; 296 mutex_lock(&ls->ls_mutex); 297 } else { 298 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); 299 300 status = nfserr_bad_stateid; 301 mutex_lock(&ls->ls_mutex); 302 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid)) 303 goto out_unlock_stid; 304 if (layout_type != ls->ls_layout_type) 305 goto out_unlock_stid; 306 } 307 308 *lsp = ls; 309 return 0; 310 311 out_unlock_stid: 312 mutex_unlock(&ls->ls_mutex); 313 out_put_stid: 314 nfs4_put_stid(stid); 315 out: 316 return status; 317 } 318 319 static void 320 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) 321 { 322 spin_lock(&ls->ls_lock); 323 if (ls->ls_recalled) 324 goto out_unlock; 325 326 ls->ls_recalled = true; 327 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); 328 if (list_empty(&ls->ls_layouts)) 329 goto out_unlock; 330 331 trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid); 332 333 refcount_inc(&ls->ls_stid.sc_count); 334 nfsd4_run_cb(&ls->ls_recall); 335 336 out_unlock: 337 spin_unlock(&ls->ls_lock); 338 } 339 340 static inline u64 341 layout_end(struct nfsd4_layout_seg *seg) 342 { 343 u64 end = seg->offset + seg->length; 344 return end >= seg->offset ? end : NFS4_MAX_UINT64; 345 } 346 347 static void 348 layout_update_len(struct nfsd4_layout_seg *lo, u64 end) 349 { 350 if (end == NFS4_MAX_UINT64) 351 lo->length = NFS4_MAX_UINT64; 352 else 353 lo->length = end - lo->offset; 354 } 355 356 static bool 357 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) 358 { 359 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) 360 return false; 361 if (layout_end(&lo->lo_seg) <= s->offset) 362 return false; 363 if (layout_end(s) <= lo->lo_seg.offset) 364 return false; 365 return true; 366 } 367 368 static bool 369 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) 370 { 371 if (lo->iomode != new->iomode) 372 return false; 373 if (layout_end(new) < lo->offset) 374 return false; 375 if (layout_end(lo) < new->offset) 376 return false; 377 378 lo->offset = min(lo->offset, new->offset); 379 layout_update_len(lo, max(layout_end(lo), layout_end(new))); 380 return true; 381 } 382 383 static __be32 384 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) 385 { 386 struct nfs4_file *fp = ls->ls_stid.sc_file; 387 struct nfs4_layout_stateid *l, *n; 388 __be32 nfserr = nfs_ok; 389 390 assert_spin_locked(&fp->fi_lock); 391 392 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { 393 if (l != ls) { 394 nfsd4_recall_file_layout(l); 395 nfserr = nfserr_recallconflict; 396 } 397 } 398 399 return nfserr; 400 } 401 402 __be32 403 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) 404 { 405 struct nfsd4_layout_seg *seg = &lgp->lg_seg; 406 struct nfs4_file *fp = ls->ls_stid.sc_file; 407 struct nfs4_layout *lp, *new = NULL; 408 __be32 nfserr; 409 410 spin_lock(&fp->fi_lock); 411 nfserr = nfsd4_recall_conflict(ls); 412 if (nfserr) 413 goto out; 414 spin_lock(&ls->ls_lock); 415 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 416 if (layouts_try_merge(&lp->lo_seg, seg)) 417 goto done; 418 } 419 spin_unlock(&ls->ls_lock); 420 spin_unlock(&fp->fi_lock); 421 422 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); 423 if (!new) 424 return nfserr_jukebox; 425 memcpy(&new->lo_seg, seg, sizeof(new->lo_seg)); 426 new->lo_state = ls; 427 428 spin_lock(&fp->fi_lock); 429 nfserr = nfsd4_recall_conflict(ls); 430 if (nfserr) 431 goto out; 432 spin_lock(&ls->ls_lock); 433 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 434 if (layouts_try_merge(&lp->lo_seg, seg)) 435 goto done; 436 } 437 438 refcount_inc(&ls->ls_stid.sc_count); 439 list_add_tail(&new->lo_perstate, &ls->ls_layouts); 440 new = NULL; 441 done: 442 nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); 443 spin_unlock(&ls->ls_lock); 444 out: 445 spin_unlock(&fp->fi_lock); 446 if (new) 447 kmem_cache_free(nfs4_layout_cache, new); 448 return nfserr; 449 } 450 451 static void 452 nfsd4_free_layouts(struct list_head *reaplist) 453 { 454 while (!list_empty(reaplist)) { 455 struct nfs4_layout *lp = list_first_entry(reaplist, 456 struct nfs4_layout, lo_perstate); 457 458 list_del(&lp->lo_perstate); 459 nfs4_put_stid(&lp->lo_state->ls_stid); 460 kmem_cache_free(nfs4_layout_cache, lp); 461 } 462 } 463 464 static void 465 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, 466 struct list_head *reaplist) 467 { 468 struct nfsd4_layout_seg *lo = &lp->lo_seg; 469 u64 end = layout_end(lo); 470 471 if (seg->offset <= lo->offset) { 472 if (layout_end(seg) >= end) { 473 list_move_tail(&lp->lo_perstate, reaplist); 474 return; 475 } 476 lo->offset = layout_end(seg); 477 } else { 478 /* retain the whole layout segment on a split. */ 479 if (layout_end(seg) < end) { 480 dprintk("%s: split not supported\n", __func__); 481 return; 482 } 483 end = seg->offset; 484 } 485 486 layout_update_len(lo, end); 487 } 488 489 __be32 490 nfsd4_return_file_layouts(struct svc_rqst *rqstp, 491 struct nfsd4_compound_state *cstate, 492 struct nfsd4_layoutreturn *lrp) 493 { 494 struct nfs4_layout_stateid *ls; 495 struct nfs4_layout *lp, *n; 496 LIST_HEAD(reaplist); 497 __be32 nfserr; 498 int found = 0; 499 500 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid, 501 false, lrp->lr_layout_type, 502 &ls); 503 if (nfserr) { 504 trace_nfsd_layout_return_lookup_fail(&lrp->lr_sid); 505 return nfserr; 506 } 507 508 spin_lock(&ls->ls_lock); 509 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { 510 if (layouts_overlapping(lp, &lrp->lr_seg)) { 511 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); 512 found++; 513 } 514 } 515 if (!list_empty(&ls->ls_layouts)) { 516 if (found) 517 nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); 518 lrp->lrs_present = 1; 519 } else { 520 trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid); 521 nfs4_unhash_stid(&ls->ls_stid); 522 lrp->lrs_present = 0; 523 } 524 spin_unlock(&ls->ls_lock); 525 526 mutex_unlock(&ls->ls_mutex); 527 nfs4_put_stid(&ls->ls_stid); 528 nfsd4_free_layouts(&reaplist); 529 return nfs_ok; 530 } 531 532 __be32 533 nfsd4_return_client_layouts(struct svc_rqst *rqstp, 534 struct nfsd4_compound_state *cstate, 535 struct nfsd4_layoutreturn *lrp) 536 { 537 struct nfs4_layout_stateid *ls, *n; 538 struct nfs4_client *clp = cstate->clp; 539 struct nfs4_layout *lp, *t; 540 LIST_HEAD(reaplist); 541 542 lrp->lrs_present = 0; 543 544 spin_lock(&clp->cl_lock); 545 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { 546 if (ls->ls_layout_type != lrp->lr_layout_type) 547 continue; 548 549 if (lrp->lr_return_type == RETURN_FSID && 550 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, 551 &cstate->current_fh.fh_handle)) 552 continue; 553 554 spin_lock(&ls->ls_lock); 555 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { 556 if (lrp->lr_seg.iomode == IOMODE_ANY || 557 lrp->lr_seg.iomode == lp->lo_seg.iomode) 558 list_move_tail(&lp->lo_perstate, &reaplist); 559 } 560 spin_unlock(&ls->ls_lock); 561 } 562 spin_unlock(&clp->cl_lock); 563 564 nfsd4_free_layouts(&reaplist); 565 return 0; 566 } 567 568 static void 569 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, 570 struct list_head *reaplist) 571 { 572 spin_lock(&ls->ls_lock); 573 list_splice_init(&ls->ls_layouts, reaplist); 574 spin_unlock(&ls->ls_lock); 575 } 576 577 void 578 nfsd4_return_all_client_layouts(struct nfs4_client *clp) 579 { 580 struct nfs4_layout_stateid *ls, *n; 581 LIST_HEAD(reaplist); 582 583 spin_lock(&clp->cl_lock); 584 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) 585 nfsd4_return_all_layouts(ls, &reaplist); 586 spin_unlock(&clp->cl_lock); 587 588 nfsd4_free_layouts(&reaplist); 589 } 590 591 void 592 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) 593 { 594 struct nfs4_layout_stateid *ls, *n; 595 LIST_HEAD(reaplist); 596 597 spin_lock(&fp->fi_lock); 598 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { 599 if (ls->ls_stid.sc_client == clp) 600 nfsd4_return_all_layouts(ls, &reaplist); 601 } 602 spin_unlock(&fp->fi_lock); 603 604 nfsd4_free_layouts(&reaplist); 605 } 606 607 static void 608 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls) 609 { 610 struct nfs4_client *clp = ls->ls_stid.sc_client; 611 char addr_str[INET6_ADDRSTRLEN]; 612 static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed"; 613 static char *envp[] = { 614 "HOME=/", 615 "TERM=linux", 616 "PATH=/sbin:/usr/sbin:/bin:/usr/bin", 617 NULL 618 }; 619 char *argv[8]; 620 int error; 621 622 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); 623 624 printk(KERN_WARNING 625 "nfsd: client %s failed to respond to layout recall. " 626 " Fencing..\n", addr_str); 627 628 argv[0] = (char *)nfsd_recall_failed; 629 argv[1] = addr_str; 630 argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id; 631 argv[3] = NULL; 632 633 error = call_usermodehelper(nfsd_recall_failed, argv, envp, 634 UMH_WAIT_PROC); 635 if (error) { 636 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", 637 addr_str, error); 638 } 639 } 640 641 static void 642 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) 643 { 644 struct nfs4_layout_stateid *ls = 645 container_of(cb, struct nfs4_layout_stateid, ls_recall); 646 647 mutex_lock(&ls->ls_mutex); 648 nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); 649 mutex_unlock(&ls->ls_mutex); 650 } 651 652 static int 653 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) 654 { 655 struct nfs4_layout_stateid *ls = 656 container_of(cb, struct nfs4_layout_stateid, ls_recall); 657 struct nfsd_net *nn; 658 ktime_t now, cutoff; 659 const struct nfsd4_layout_ops *ops; 660 661 662 switch (task->tk_status) { 663 case 0: 664 case -NFS4ERR_DELAY: 665 /* 666 * Anything left? If not, then call it done. Note that we don't 667 * take the spinlock since this is an optimization and nothing 668 * should get added until the cb counter goes to zero. 669 */ 670 if (list_empty(&ls->ls_layouts)) 671 return 1; 672 673 /* Poll the client until it's done with the layout */ 674 now = ktime_get(); 675 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id); 676 677 /* Client gets 2 lease periods to return it */ 678 cutoff = ktime_add_ns(task->tk_start, 679 (u64)nn->nfsd4_lease * NSEC_PER_SEC * 2); 680 681 if (ktime_before(now, cutoff)) { 682 rpc_delay(task, HZ/100); /* 10 mili-seconds */ 683 return 0; 684 } 685 fallthrough; 686 default: 687 /* 688 * Unknown error or non-responding client, we'll need to fence. 689 */ 690 trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid); 691 692 ops = nfsd4_layout_ops[ls->ls_layout_type]; 693 if (ops->fence_client) 694 ops->fence_client(ls); 695 else 696 nfsd4_cb_layout_fail(ls); 697 return 1; 698 case -NFS4ERR_NOMATCHING_LAYOUT: 699 trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid); 700 task->tk_status = 0; 701 return 1; 702 } 703 } 704 705 static void 706 nfsd4_cb_layout_release(struct nfsd4_callback *cb) 707 { 708 struct nfs4_layout_stateid *ls = 709 container_of(cb, struct nfs4_layout_stateid, ls_recall); 710 LIST_HEAD(reaplist); 711 712 trace_nfsd_layout_recall_release(&ls->ls_stid.sc_stateid); 713 714 nfsd4_return_all_layouts(ls, &reaplist); 715 nfsd4_free_layouts(&reaplist); 716 nfs4_put_stid(&ls->ls_stid); 717 } 718 719 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { 720 .prepare = nfsd4_cb_layout_prepare, 721 .done = nfsd4_cb_layout_done, 722 .release = nfsd4_cb_layout_release, 723 }; 724 725 static bool 726 nfsd4_layout_lm_break(struct file_lock *fl) 727 { 728 /* 729 * We don't want the locks code to timeout the lease for us; 730 * we'll remove it ourself if a layout isn't returned 731 * in time: 732 */ 733 fl->fl_break_time = 0; 734 nfsd4_recall_file_layout(fl->fl_owner); 735 return false; 736 } 737 738 static int 739 nfsd4_layout_lm_change(struct file_lock *onlist, int arg, 740 struct list_head *dispose) 741 { 742 BUG_ON(!(arg & F_UNLCK)); 743 return lease_modify(onlist, arg, dispose); 744 } 745 746 static const struct lock_manager_operations nfsd4_layouts_lm_ops = { 747 .lm_break = nfsd4_layout_lm_break, 748 .lm_change = nfsd4_layout_lm_change, 749 }; 750 751 int 752 nfsd4_init_pnfs(void) 753 { 754 int i; 755 756 for (i = 0; i < DEVID_HASH_SIZE; i++) 757 INIT_LIST_HEAD(&nfsd_devid_hash[i]); 758 759 nfs4_layout_cache = kmem_cache_create("nfs4_layout", 760 sizeof(struct nfs4_layout), 0, 0, NULL); 761 if (!nfs4_layout_cache) 762 return -ENOMEM; 763 764 nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid", 765 sizeof(struct nfs4_layout_stateid), 0, 0, NULL); 766 if (!nfs4_layout_stateid_cache) { 767 kmem_cache_destroy(nfs4_layout_cache); 768 return -ENOMEM; 769 } 770 return 0; 771 } 772 773 void 774 nfsd4_exit_pnfs(void) 775 { 776 int i; 777 778 kmem_cache_destroy(nfs4_layout_cache); 779 kmem_cache_destroy(nfs4_layout_stateid_cache); 780 781 for (i = 0; i < DEVID_HASH_SIZE; i++) { 782 struct nfsd4_deviceid_map *map, *n; 783 784 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) 785 kfree(map); 786 } 787 } 788