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 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls); 178 fput(ls->ls_file); 179 180 if (ls->ls_recalled) 181 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); 182 183 kmem_cache_free(nfs4_layout_stateid_cache, ls); 184 } 185 186 static int 187 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) 188 { 189 struct file_lock *fl; 190 int status; 191 192 fl = locks_alloc_lock(); 193 if (!fl) 194 return -ENOMEM; 195 locks_init_lock(fl); 196 fl->fl_lmops = &nfsd4_layouts_lm_ops; 197 fl->fl_flags = FL_LAYOUT; 198 fl->fl_type = F_RDLCK; 199 fl->fl_end = OFFSET_MAX; 200 fl->fl_owner = ls; 201 fl->fl_pid = current->tgid; 202 fl->fl_file = ls->ls_file; 203 204 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); 205 if (status) { 206 locks_free_lock(fl); 207 return status; 208 } 209 BUG_ON(fl != NULL); 210 return 0; 211 } 212 213 static struct nfs4_layout_stateid * 214 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, 215 struct nfs4_stid *parent, u32 layout_type) 216 { 217 struct nfs4_client *clp = cstate->clp; 218 struct nfs4_file *fp = parent->sc_file; 219 struct nfs4_layout_stateid *ls; 220 struct nfs4_stid *stp; 221 222 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache); 223 if (!stp) 224 return NULL; 225 stp->sc_free = nfsd4_free_layout_stateid; 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 = get_file(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 fput(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_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_layout_recall(&ls->ls_stid.sc_stateid); 332 333 atomic_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(lp->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 atomic_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_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_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 *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] = "/sbin/nfsd-recall-failed"; 628 argv[1] = addr_str; 629 argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id; 630 argv[3] = NULL; 631 632 error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); 633 if (error) { 634 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", 635 addr_str, error); 636 } 637 } 638 639 static void 640 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) 641 { 642 struct nfs4_layout_stateid *ls = 643 container_of(cb, struct nfs4_layout_stateid, ls_recall); 644 645 mutex_lock(&ls->ls_mutex); 646 nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); 647 mutex_unlock(&ls->ls_mutex); 648 } 649 650 static int 651 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) 652 { 653 struct nfs4_layout_stateid *ls = 654 container_of(cb, struct nfs4_layout_stateid, ls_recall); 655 struct nfsd_net *nn; 656 ktime_t now, cutoff; 657 const struct nfsd4_layout_ops *ops; 658 LIST_HEAD(reaplist); 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 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 case -NFS4ERR_NOMATCHING_LAYOUT: 686 trace_layout_recall_done(&ls->ls_stid.sc_stateid); 687 task->tk_status = 0; 688 return 1; 689 default: 690 /* 691 * Unknown error or non-responding client, we'll need to fence. 692 */ 693 trace_layout_recall_fail(&ls->ls_stid.sc_stateid); 694 695 ops = nfsd4_layout_ops[ls->ls_layout_type]; 696 if (ops->fence_client) 697 ops->fence_client(ls); 698 else 699 nfsd4_cb_layout_fail(ls); 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_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