1 /* 2 * Copyright (c) 2014 Christoph Hellwig. 3 */ 4 #include <linux/blkdev.h> 5 #include <linux/kmod.h> 6 #include <linux/file.h> 7 #include <linux/jhash.h> 8 #include <linux/sched.h> 9 #include <linux/sunrpc/addr.h> 10 11 #include "pnfs.h" 12 #include "netns.h" 13 #include "trace.h" 14 15 #define NFSDDBG_FACILITY NFSDDBG_PNFS 16 17 struct nfs4_layout { 18 struct list_head lo_perstate; 19 struct nfs4_layout_stateid *lo_state; 20 struct nfsd4_layout_seg lo_seg; 21 }; 22 23 static struct kmem_cache *nfs4_layout_cache; 24 static struct kmem_cache *nfs4_layout_stateid_cache; 25 26 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops; 27 static const struct lock_manager_operations nfsd4_layouts_lm_ops; 28 29 const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = { 30 #ifdef CONFIG_NFSD_FLEXFILELAYOUT 31 [LAYOUT_FLEX_FILES] = &ff_layout_ops, 32 #endif 33 #ifdef CONFIG_NFSD_BLOCKLAYOUT 34 [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops, 35 #endif 36 #ifdef CONFIG_NFSD_SCSILAYOUT 37 [LAYOUT_SCSI] = &scsi_layout_ops, 38 #endif 39 }; 40 41 /* pNFS device ID to export fsid mapping */ 42 #define DEVID_HASH_BITS 8 43 #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS) 44 #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1) 45 static u64 nfsd_devid_seq = 1; 46 static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE]; 47 static DEFINE_SPINLOCK(nfsd_devid_lock); 48 49 static inline u32 devid_hashfn(u64 idx) 50 { 51 return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK; 52 } 53 54 static void 55 nfsd4_alloc_devid_map(const struct svc_fh *fhp) 56 { 57 const struct knfsd_fh *fh = &fhp->fh_handle; 58 size_t fsid_len = key_len(fh->fh_fsid_type); 59 struct nfsd4_deviceid_map *map, *old; 60 int i; 61 62 map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL); 63 if (!map) 64 return; 65 66 map->fsid_type = fh->fh_fsid_type; 67 memcpy(&map->fsid, fh->fh_fsid, fsid_len); 68 69 spin_lock(&nfsd_devid_lock); 70 if (fhp->fh_export->ex_devid_map) 71 goto out_unlock; 72 73 for (i = 0; i < DEVID_HASH_SIZE; i++) { 74 list_for_each_entry(old, &nfsd_devid_hash[i], hash) { 75 if (old->fsid_type != fh->fh_fsid_type) 76 continue; 77 if (memcmp(old->fsid, fh->fh_fsid, 78 key_len(old->fsid_type))) 79 continue; 80 81 fhp->fh_export->ex_devid_map = old; 82 goto out_unlock; 83 } 84 } 85 86 map->idx = nfsd_devid_seq++; 87 list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]); 88 fhp->fh_export->ex_devid_map = map; 89 map = NULL; 90 91 out_unlock: 92 spin_unlock(&nfsd_devid_lock); 93 kfree(map); 94 } 95 96 struct nfsd4_deviceid_map * 97 nfsd4_find_devid_map(int idx) 98 { 99 struct nfsd4_deviceid_map *map, *ret = NULL; 100 101 rcu_read_lock(); 102 list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash) 103 if (map->idx == idx) 104 ret = map; 105 rcu_read_unlock(); 106 107 return ret; 108 } 109 110 int 111 nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp, 112 u32 device_generation) 113 { 114 if (!fhp->fh_export->ex_devid_map) { 115 nfsd4_alloc_devid_map(fhp); 116 if (!fhp->fh_export->ex_devid_map) 117 return -ENOMEM; 118 } 119 120 id->fsid_idx = fhp->fh_export->ex_devid_map->idx; 121 id->generation = device_generation; 122 id->pad = 0; 123 return 0; 124 } 125 126 void nfsd4_setup_layout_type(struct svc_export *exp) 127 { 128 #if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT) 129 struct super_block *sb = exp->ex_path.mnt->mnt_sb; 130 #endif 131 132 if (!(exp->ex_flags & NFSEXP_PNFS)) 133 return; 134 135 /* 136 * If flex file is configured, use it by default. Otherwise 137 * check if the file system supports exporting a block-like layout. 138 * If the block device supports reservations prefer the SCSI layout, 139 * otherwise advertise the block layout. 140 */ 141 #ifdef CONFIG_NFSD_FLEXFILELAYOUT 142 exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES; 143 #endif 144 #ifdef CONFIG_NFSD_BLOCKLAYOUT 145 /* overwrite flex file layout selection if needed */ 146 if (sb->s_export_op->get_uuid && 147 sb->s_export_op->map_blocks && 148 sb->s_export_op->commit_blocks) 149 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME; 150 #endif 151 #ifdef CONFIG_NFSD_SCSILAYOUT 152 /* overwrite block layout selection if needed */ 153 if (sb->s_export_op->map_blocks && 154 sb->s_export_op->commit_blocks && 155 sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops) 156 exp->ex_layout_types |= 1 << LAYOUT_SCSI; 157 #endif 158 } 159 160 static void 161 nfsd4_free_layout_stateid(struct nfs4_stid *stid) 162 { 163 struct nfs4_layout_stateid *ls = layoutstateid(stid); 164 struct nfs4_client *clp = ls->ls_stid.sc_client; 165 struct nfs4_file *fp = ls->ls_stid.sc_file; 166 167 trace_layoutstate_free(&ls->ls_stid.sc_stateid); 168 169 spin_lock(&clp->cl_lock); 170 list_del_init(&ls->ls_perclnt); 171 spin_unlock(&clp->cl_lock); 172 173 spin_lock(&fp->fi_lock); 174 list_del_init(&ls->ls_perfile); 175 spin_unlock(&fp->fi_lock); 176 177 if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 178 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls); 179 fput(ls->ls_file); 180 181 if (ls->ls_recalled) 182 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); 183 184 kmem_cache_free(nfs4_layout_stateid_cache, ls); 185 } 186 187 static int 188 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) 189 { 190 struct file_lock *fl; 191 int status; 192 193 if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 194 return 0; 195 196 fl = locks_alloc_lock(); 197 if (!fl) 198 return -ENOMEM; 199 locks_init_lock(fl); 200 fl->fl_lmops = &nfsd4_layouts_lm_ops; 201 fl->fl_flags = FL_LAYOUT; 202 fl->fl_type = F_RDLCK; 203 fl->fl_end = OFFSET_MAX; 204 fl->fl_owner = ls; 205 fl->fl_pid = current->tgid; 206 fl->fl_file = ls->ls_file; 207 208 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); 209 if (status) { 210 locks_free_lock(fl); 211 return status; 212 } 213 BUG_ON(fl != NULL); 214 return 0; 215 } 216 217 static struct nfs4_layout_stateid * 218 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, 219 struct nfs4_stid *parent, u32 layout_type) 220 { 221 struct nfs4_client *clp = cstate->clp; 222 struct nfs4_file *fp = parent->sc_file; 223 struct nfs4_layout_stateid *ls; 224 struct nfs4_stid *stp; 225 226 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache, 227 nfsd4_free_layout_stateid); 228 if (!stp) 229 return NULL; 230 231 get_nfs4_file(fp); 232 stp->sc_file = fp; 233 234 ls = layoutstateid(stp); 235 INIT_LIST_HEAD(&ls->ls_perclnt); 236 INIT_LIST_HEAD(&ls->ls_perfile); 237 spin_lock_init(&ls->ls_lock); 238 INIT_LIST_HEAD(&ls->ls_layouts); 239 mutex_init(&ls->ls_mutex); 240 ls->ls_layout_type = layout_type; 241 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, 242 NFSPROC4_CLNT_CB_LAYOUT); 243 244 if (parent->sc_type == NFS4_DELEG_STID) 245 ls->ls_file = get_file(fp->fi_deleg_file); 246 else 247 ls->ls_file = find_any_file(fp); 248 BUG_ON(!ls->ls_file); 249 250 if (nfsd4_layout_setlease(ls)) { 251 fput(ls->ls_file); 252 put_nfs4_file(fp); 253 kmem_cache_free(nfs4_layout_stateid_cache, ls); 254 return NULL; 255 } 256 257 spin_lock(&clp->cl_lock); 258 stp->sc_type = NFS4_LAYOUT_STID; 259 list_add(&ls->ls_perclnt, &clp->cl_lo_states); 260 spin_unlock(&clp->cl_lock); 261 262 spin_lock(&fp->fi_lock); 263 list_add(&ls->ls_perfile, &fp->fi_lo_states); 264 spin_unlock(&fp->fi_lock); 265 266 trace_layoutstate_alloc(&ls->ls_stid.sc_stateid); 267 return ls; 268 } 269 270 __be32 271 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, 272 struct nfsd4_compound_state *cstate, stateid_t *stateid, 273 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) 274 { 275 struct nfs4_layout_stateid *ls; 276 struct nfs4_stid *stid; 277 unsigned char typemask = NFS4_LAYOUT_STID; 278 __be32 status; 279 280 if (create) 281 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); 282 283 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid, 284 net_generic(SVC_NET(rqstp), nfsd_net_id)); 285 if (status) 286 goto out; 287 288 if (!fh_match(&cstate->current_fh.fh_handle, 289 &stid->sc_file->fi_fhandle)) { 290 status = nfserr_bad_stateid; 291 goto out_put_stid; 292 } 293 294 if (stid->sc_type != NFS4_LAYOUT_STID) { 295 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type); 296 nfs4_put_stid(stid); 297 298 status = nfserr_jukebox; 299 if (!ls) 300 goto out; 301 mutex_lock(&ls->ls_mutex); 302 } else { 303 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); 304 305 status = nfserr_bad_stateid; 306 mutex_lock(&ls->ls_mutex); 307 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid)) 308 goto out_unlock_stid; 309 if (layout_type != ls->ls_layout_type) 310 goto out_unlock_stid; 311 } 312 313 *lsp = ls; 314 return 0; 315 316 out_unlock_stid: 317 mutex_unlock(&ls->ls_mutex); 318 out_put_stid: 319 nfs4_put_stid(stid); 320 out: 321 return status; 322 } 323 324 static void 325 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) 326 { 327 spin_lock(&ls->ls_lock); 328 if (ls->ls_recalled) 329 goto out_unlock; 330 331 ls->ls_recalled = true; 332 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); 333 if (list_empty(&ls->ls_layouts)) 334 goto out_unlock; 335 336 trace_layout_recall(&ls->ls_stid.sc_stateid); 337 338 atomic_inc(&ls->ls_stid.sc_count); 339 nfsd4_run_cb(&ls->ls_recall); 340 341 out_unlock: 342 spin_unlock(&ls->ls_lock); 343 } 344 345 static inline u64 346 layout_end(struct nfsd4_layout_seg *seg) 347 { 348 u64 end = seg->offset + seg->length; 349 return end >= seg->offset ? end : NFS4_MAX_UINT64; 350 } 351 352 static void 353 layout_update_len(struct nfsd4_layout_seg *lo, u64 end) 354 { 355 if (end == NFS4_MAX_UINT64) 356 lo->length = NFS4_MAX_UINT64; 357 else 358 lo->length = end - lo->offset; 359 } 360 361 static bool 362 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) 363 { 364 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) 365 return false; 366 if (layout_end(&lo->lo_seg) <= s->offset) 367 return false; 368 if (layout_end(s) <= lo->lo_seg.offset) 369 return false; 370 return true; 371 } 372 373 static bool 374 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) 375 { 376 if (lo->iomode != new->iomode) 377 return false; 378 if (layout_end(new) < lo->offset) 379 return false; 380 if (layout_end(lo) < new->offset) 381 return false; 382 383 lo->offset = min(lo->offset, new->offset); 384 layout_update_len(lo, max(layout_end(lo), layout_end(new))); 385 return true; 386 } 387 388 static __be32 389 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) 390 { 391 struct nfs4_file *fp = ls->ls_stid.sc_file; 392 struct nfs4_layout_stateid *l, *n; 393 __be32 nfserr = nfs_ok; 394 395 assert_spin_locked(&fp->fi_lock); 396 397 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { 398 if (l != ls) { 399 nfsd4_recall_file_layout(l); 400 nfserr = nfserr_recallconflict; 401 } 402 } 403 404 return nfserr; 405 } 406 407 __be32 408 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) 409 { 410 struct nfsd4_layout_seg *seg = &lgp->lg_seg; 411 struct nfs4_file *fp = ls->ls_stid.sc_file; 412 struct nfs4_layout *lp, *new = NULL; 413 __be32 nfserr; 414 415 spin_lock(&fp->fi_lock); 416 nfserr = nfsd4_recall_conflict(ls); 417 if (nfserr) 418 goto out; 419 spin_lock(&ls->ls_lock); 420 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 421 if (layouts_try_merge(&lp->lo_seg, seg)) 422 goto done; 423 } 424 spin_unlock(&ls->ls_lock); 425 spin_unlock(&fp->fi_lock); 426 427 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); 428 if (!new) 429 return nfserr_jukebox; 430 memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg)); 431 new->lo_state = ls; 432 433 spin_lock(&fp->fi_lock); 434 nfserr = nfsd4_recall_conflict(ls); 435 if (nfserr) 436 goto out; 437 spin_lock(&ls->ls_lock); 438 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 439 if (layouts_try_merge(&lp->lo_seg, seg)) 440 goto done; 441 } 442 443 atomic_inc(&ls->ls_stid.sc_count); 444 list_add_tail(&new->lo_perstate, &ls->ls_layouts); 445 new = NULL; 446 done: 447 nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); 448 spin_unlock(&ls->ls_lock); 449 out: 450 spin_unlock(&fp->fi_lock); 451 if (new) 452 kmem_cache_free(nfs4_layout_cache, new); 453 return nfserr; 454 } 455 456 static void 457 nfsd4_free_layouts(struct list_head *reaplist) 458 { 459 while (!list_empty(reaplist)) { 460 struct nfs4_layout *lp = list_first_entry(reaplist, 461 struct nfs4_layout, lo_perstate); 462 463 list_del(&lp->lo_perstate); 464 nfs4_put_stid(&lp->lo_state->ls_stid); 465 kmem_cache_free(nfs4_layout_cache, lp); 466 } 467 } 468 469 static void 470 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, 471 struct list_head *reaplist) 472 { 473 struct nfsd4_layout_seg *lo = &lp->lo_seg; 474 u64 end = layout_end(lo); 475 476 if (seg->offset <= lo->offset) { 477 if (layout_end(seg) >= end) { 478 list_move_tail(&lp->lo_perstate, reaplist); 479 return; 480 } 481 lo->offset = layout_end(seg); 482 } else { 483 /* retain the whole layout segment on a split. */ 484 if (layout_end(seg) < end) { 485 dprintk("%s: split not supported\n", __func__); 486 return; 487 } 488 end = seg->offset; 489 } 490 491 layout_update_len(lo, end); 492 } 493 494 __be32 495 nfsd4_return_file_layouts(struct svc_rqst *rqstp, 496 struct nfsd4_compound_state *cstate, 497 struct nfsd4_layoutreturn *lrp) 498 { 499 struct nfs4_layout_stateid *ls; 500 struct nfs4_layout *lp, *n; 501 LIST_HEAD(reaplist); 502 __be32 nfserr; 503 int found = 0; 504 505 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid, 506 false, lrp->lr_layout_type, 507 &ls); 508 if (nfserr) { 509 trace_layout_return_lookup_fail(&lrp->lr_sid); 510 return nfserr; 511 } 512 513 spin_lock(&ls->ls_lock); 514 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { 515 if (layouts_overlapping(lp, &lrp->lr_seg)) { 516 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); 517 found++; 518 } 519 } 520 if (!list_empty(&ls->ls_layouts)) { 521 if (found) 522 nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); 523 lrp->lrs_present = 1; 524 } else { 525 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid); 526 nfs4_unhash_stid(&ls->ls_stid); 527 lrp->lrs_present = 0; 528 } 529 spin_unlock(&ls->ls_lock); 530 531 mutex_unlock(&ls->ls_mutex); 532 nfs4_put_stid(&ls->ls_stid); 533 nfsd4_free_layouts(&reaplist); 534 return nfs_ok; 535 } 536 537 __be32 538 nfsd4_return_client_layouts(struct svc_rqst *rqstp, 539 struct nfsd4_compound_state *cstate, 540 struct nfsd4_layoutreturn *lrp) 541 { 542 struct nfs4_layout_stateid *ls, *n; 543 struct nfs4_client *clp = cstate->clp; 544 struct nfs4_layout *lp, *t; 545 LIST_HEAD(reaplist); 546 547 lrp->lrs_present = 0; 548 549 spin_lock(&clp->cl_lock); 550 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { 551 if (ls->ls_layout_type != lrp->lr_layout_type) 552 continue; 553 554 if (lrp->lr_return_type == RETURN_FSID && 555 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, 556 &cstate->current_fh.fh_handle)) 557 continue; 558 559 spin_lock(&ls->ls_lock); 560 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { 561 if (lrp->lr_seg.iomode == IOMODE_ANY || 562 lrp->lr_seg.iomode == lp->lo_seg.iomode) 563 list_move_tail(&lp->lo_perstate, &reaplist); 564 } 565 spin_unlock(&ls->ls_lock); 566 } 567 spin_unlock(&clp->cl_lock); 568 569 nfsd4_free_layouts(&reaplist); 570 return 0; 571 } 572 573 static void 574 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, 575 struct list_head *reaplist) 576 { 577 spin_lock(&ls->ls_lock); 578 list_splice_init(&ls->ls_layouts, reaplist); 579 spin_unlock(&ls->ls_lock); 580 } 581 582 void 583 nfsd4_return_all_client_layouts(struct nfs4_client *clp) 584 { 585 struct nfs4_layout_stateid *ls, *n; 586 LIST_HEAD(reaplist); 587 588 spin_lock(&clp->cl_lock); 589 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) 590 nfsd4_return_all_layouts(ls, &reaplist); 591 spin_unlock(&clp->cl_lock); 592 593 nfsd4_free_layouts(&reaplist); 594 } 595 596 void 597 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) 598 { 599 struct nfs4_layout_stateid *ls, *n; 600 LIST_HEAD(reaplist); 601 602 spin_lock(&fp->fi_lock); 603 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { 604 if (ls->ls_stid.sc_client == clp) 605 nfsd4_return_all_layouts(ls, &reaplist); 606 } 607 spin_unlock(&fp->fi_lock); 608 609 nfsd4_free_layouts(&reaplist); 610 } 611 612 static void 613 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls) 614 { 615 struct nfs4_client *clp = ls->ls_stid.sc_client; 616 char addr_str[INET6_ADDRSTRLEN]; 617 static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed"; 618 static char *envp[] = { 619 "HOME=/", 620 "TERM=linux", 621 "PATH=/sbin:/usr/sbin:/bin:/usr/bin", 622 NULL 623 }; 624 char *argv[8]; 625 int error; 626 627 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); 628 629 printk(KERN_WARNING 630 "nfsd: client %s failed to respond to layout recall. " 631 " Fencing..\n", addr_str); 632 633 argv[0] = (char *)nfsd_recall_failed; 634 argv[1] = addr_str; 635 argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id; 636 argv[3] = NULL; 637 638 error = call_usermodehelper(nfsd_recall_failed, argv, envp, 639 UMH_WAIT_PROC); 640 if (error) { 641 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", 642 addr_str, error); 643 } 644 } 645 646 static void 647 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) 648 { 649 struct nfs4_layout_stateid *ls = 650 container_of(cb, struct nfs4_layout_stateid, ls_recall); 651 652 mutex_lock(&ls->ls_mutex); 653 nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); 654 mutex_unlock(&ls->ls_mutex); 655 } 656 657 static int 658 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) 659 { 660 struct nfs4_layout_stateid *ls = 661 container_of(cb, struct nfs4_layout_stateid, ls_recall); 662 struct nfsd_net *nn; 663 ktime_t now, cutoff; 664 const struct nfsd4_layout_ops *ops; 665 LIST_HEAD(reaplist); 666 667 668 switch (task->tk_status) { 669 case 0: 670 case -NFS4ERR_DELAY: 671 /* 672 * Anything left? If not, then call it done. Note that we don't 673 * take the spinlock since this is an optimization and nothing 674 * should get added until the cb counter goes to zero. 675 */ 676 if (list_empty(&ls->ls_layouts)) 677 return 1; 678 679 /* Poll the client until it's done with the layout */ 680 now = ktime_get(); 681 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id); 682 683 /* Client gets 2 lease periods to return it */ 684 cutoff = ktime_add_ns(task->tk_start, 685 nn->nfsd4_lease * NSEC_PER_SEC * 2); 686 687 if (ktime_before(now, cutoff)) { 688 rpc_delay(task, HZ/100); /* 10 mili-seconds */ 689 return 0; 690 } 691 /* Fallthrough */ 692 default: 693 /* 694 * Unknown error or non-responding client, we'll need to fence. 695 */ 696 trace_layout_recall_fail(&ls->ls_stid.sc_stateid); 697 698 ops = nfsd4_layout_ops[ls->ls_layout_type]; 699 if (ops->fence_client) 700 ops->fence_client(ls); 701 else 702 nfsd4_cb_layout_fail(ls); 703 return -1; 704 case -NFS4ERR_NOMATCHING_LAYOUT: 705 trace_layout_recall_done(&ls->ls_stid.sc_stateid); 706 task->tk_status = 0; 707 return 1; 708 } 709 } 710 711 static void 712 nfsd4_cb_layout_release(struct nfsd4_callback *cb) 713 { 714 struct nfs4_layout_stateid *ls = 715 container_of(cb, struct nfs4_layout_stateid, ls_recall); 716 LIST_HEAD(reaplist); 717 718 trace_layout_recall_release(&ls->ls_stid.sc_stateid); 719 720 nfsd4_return_all_layouts(ls, &reaplist); 721 nfsd4_free_layouts(&reaplist); 722 nfs4_put_stid(&ls->ls_stid); 723 } 724 725 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { 726 .prepare = nfsd4_cb_layout_prepare, 727 .done = nfsd4_cb_layout_done, 728 .release = nfsd4_cb_layout_release, 729 }; 730 731 static bool 732 nfsd4_layout_lm_break(struct file_lock *fl) 733 { 734 /* 735 * We don't want the locks code to timeout the lease for us; 736 * we'll remove it ourself if a layout isn't returned 737 * in time: 738 */ 739 fl->fl_break_time = 0; 740 nfsd4_recall_file_layout(fl->fl_owner); 741 return false; 742 } 743 744 static int 745 nfsd4_layout_lm_change(struct file_lock *onlist, int arg, 746 struct list_head *dispose) 747 { 748 BUG_ON(!(arg & F_UNLCK)); 749 return lease_modify(onlist, arg, dispose); 750 } 751 752 static const struct lock_manager_operations nfsd4_layouts_lm_ops = { 753 .lm_break = nfsd4_layout_lm_break, 754 .lm_change = nfsd4_layout_lm_change, 755 }; 756 757 int 758 nfsd4_init_pnfs(void) 759 { 760 int i; 761 762 for (i = 0; i < DEVID_HASH_SIZE; i++) 763 INIT_LIST_HEAD(&nfsd_devid_hash[i]); 764 765 nfs4_layout_cache = kmem_cache_create("nfs4_layout", 766 sizeof(struct nfs4_layout), 0, 0, NULL); 767 if (!nfs4_layout_cache) 768 return -ENOMEM; 769 770 nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid", 771 sizeof(struct nfs4_layout_stateid), 0, 0, NULL); 772 if (!nfs4_layout_stateid_cache) { 773 kmem_cache_destroy(nfs4_layout_cache); 774 return -ENOMEM; 775 } 776 return 0; 777 } 778 779 void 780 nfsd4_exit_pnfs(void) 781 { 782 int i; 783 784 kmem_cache_destroy(nfs4_layout_cache); 785 kmem_cache_destroy(nfs4_layout_stateid_cache); 786 787 for (i = 0; i < DEVID_HASH_SIZE; i++) { 788 struct nfsd4_deviceid_map *map, *n; 789 790 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) 791 kfree(map); 792 } 793 } 794