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