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 lease_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 devid_hashfn(u64 idx)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 nfsd4_alloc_devid_map(const struct svc_fh * fhp)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 * nfsd4_find_devid_map(int idx)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 nfsd4_set_deviceid(struct nfsd4_deviceid * id,const struct svc_fh * fhp,u32 device_generation)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 nfsd4_setup_layout_type(struct svc_export * exp)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 nfsd4_close_layout(struct nfs4_layout_stateid * ls)155 void nfsd4_close_layout(struct nfs4_layout_stateid *ls) 156 { 157 struct nfsd_file *fl; 158 159 spin_lock(&ls->ls_stid.sc_file->fi_lock); 160 fl = ls->ls_file; 161 ls->ls_file = NULL; 162 spin_unlock(&ls->ls_stid.sc_file->fi_lock); 163 164 if (fl) { 165 if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 166 kernel_setlease(fl->nf_file, F_UNLCK, NULL, 167 (void **)&ls); 168 nfsd_file_put(fl); 169 } 170 } 171 172 static void nfsd4_free_layout_stateid(struct nfs4_stid * stid)173 nfsd4_free_layout_stateid(struct nfs4_stid *stid) 174 { 175 struct nfs4_layout_stateid *ls = layoutstateid(stid); 176 struct nfs4_client *clp = ls->ls_stid.sc_client; 177 struct nfs4_file *fp = ls->ls_stid.sc_file; 178 179 trace_nfsd_layoutstate_free(&ls->ls_stid.sc_stateid); 180 181 spin_lock(&clp->cl_lock); 182 list_del_init(&ls->ls_perclnt); 183 spin_unlock(&clp->cl_lock); 184 185 spin_lock(&fp->fi_lock); 186 list_del_init(&ls->ls_perfile); 187 spin_unlock(&fp->fi_lock); 188 189 nfsd4_close_layout(ls); 190 191 if (ls->ls_recalled) 192 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); 193 194 kmem_cache_free(nfs4_layout_stateid_cache, ls); 195 } 196 197 static int nfsd4_layout_setlease(struct nfs4_layout_stateid * ls)198 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) 199 { 200 struct file_lease *fl; 201 int status; 202 203 if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) 204 return 0; 205 206 fl = locks_alloc_lease(); 207 if (!fl) 208 return -ENOMEM; 209 locks_init_lease(fl); 210 fl->fl_lmops = &nfsd4_layouts_lm_ops; 211 fl->c.flc_flags = FL_LAYOUT; 212 fl->c.flc_type = F_RDLCK; 213 fl->c.flc_owner = ls; 214 fl->c.flc_pid = current->tgid; 215 fl->c.flc_file = ls->ls_file->nf_file; 216 217 status = kernel_setlease(fl->c.flc_file, fl->c.flc_type, &fl, NULL); 218 if (status) { 219 locks_free_lease(fl); 220 return status; 221 } 222 BUG_ON(fl != NULL); 223 return 0; 224 } 225 226 static struct nfs4_layout_stateid * nfsd4_alloc_layout_stateid(struct nfsd4_compound_state * cstate,struct nfs4_stid * parent,u32 layout_type)227 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, 228 struct nfs4_stid *parent, u32 layout_type) 229 { 230 struct nfs4_client *clp = cstate->clp; 231 struct nfs4_file *fp = parent->sc_file; 232 struct nfs4_layout_stateid *ls; 233 struct nfs4_stid *stp; 234 235 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache, 236 nfsd4_free_layout_stateid); 237 if (!stp) 238 return NULL; 239 240 get_nfs4_file(fp); 241 stp->sc_file = fp; 242 243 ls = layoutstateid(stp); 244 INIT_LIST_HEAD(&ls->ls_perclnt); 245 INIT_LIST_HEAD(&ls->ls_perfile); 246 spin_lock_init(&ls->ls_lock); 247 INIT_LIST_HEAD(&ls->ls_layouts); 248 mutex_init(&ls->ls_mutex); 249 ls->ls_layout_type = layout_type; 250 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, 251 NFSPROC4_CLNT_CB_LAYOUT); 252 253 if (parent->sc_type == SC_TYPE_DELEG) 254 ls->ls_file = nfsd_file_get(fp->fi_deleg_file); 255 else 256 ls->ls_file = find_any_file(fp); 257 BUG_ON(!ls->ls_file); 258 259 if (nfsd4_layout_setlease(ls)) { 260 nfsd_file_put(ls->ls_file); 261 put_nfs4_file(fp); 262 kmem_cache_free(nfs4_layout_stateid_cache, ls); 263 return NULL; 264 } 265 266 spin_lock(&clp->cl_lock); 267 stp->sc_type = SC_TYPE_LAYOUT; 268 list_add(&ls->ls_perclnt, &clp->cl_lo_states); 269 spin_unlock(&clp->cl_lock); 270 271 spin_lock(&fp->fi_lock); 272 list_add(&ls->ls_perfile, &fp->fi_lo_states); 273 spin_unlock(&fp->fi_lock); 274 275 trace_nfsd_layoutstate_alloc(&ls->ls_stid.sc_stateid); 276 return ls; 277 } 278 279 __be32 nfsd4_preprocess_layout_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,stateid_t * stateid,bool create,u32 layout_type,struct nfs4_layout_stateid ** lsp)280 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, 281 struct nfsd4_compound_state *cstate, stateid_t *stateid, 282 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) 283 { 284 struct nfs4_layout_stateid *ls; 285 struct nfs4_stid *stid; 286 unsigned short typemask = SC_TYPE_LAYOUT; 287 __be32 status; 288 289 if (create) 290 typemask |= (SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG); 291 292 status = nfsd4_lookup_stateid(cstate, stateid, typemask, 0, &stid, 293 net_generic(SVC_NET(rqstp), nfsd_net_id)); 294 if (status) 295 goto out; 296 297 if (!fh_match(&cstate->current_fh.fh_handle, 298 &stid->sc_file->fi_fhandle)) { 299 status = nfserr_bad_stateid; 300 goto out_put_stid; 301 } 302 303 if (stid->sc_type != SC_TYPE_LAYOUT) { 304 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type); 305 nfs4_put_stid(stid); 306 307 status = nfserr_jukebox; 308 if (!ls) 309 goto out; 310 mutex_lock(&ls->ls_mutex); 311 } else { 312 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); 313 314 status = nfserr_bad_stateid; 315 mutex_lock(&ls->ls_mutex); 316 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid)) 317 goto out_unlock_stid; 318 if (layout_type != ls->ls_layout_type) 319 goto out_unlock_stid; 320 } 321 322 *lsp = ls; 323 return 0; 324 325 out_unlock_stid: 326 mutex_unlock(&ls->ls_mutex); 327 out_put_stid: 328 nfs4_put_stid(stid); 329 out: 330 return status; 331 } 332 333 static void nfsd4_recall_file_layout(struct nfs4_layout_stateid * ls)334 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) 335 { 336 spin_lock(&ls->ls_lock); 337 if (ls->ls_recalled) 338 goto out_unlock; 339 340 if (list_empty(&ls->ls_layouts)) 341 goto out_unlock; 342 343 ls->ls_recalled = true; 344 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); 345 trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid); 346 347 refcount_inc(&ls->ls_stid.sc_count); 348 nfsd4_run_cb(&ls->ls_recall); 349 350 out_unlock: 351 spin_unlock(&ls->ls_lock); 352 } 353 354 static inline u64 layout_end(struct nfsd4_layout_seg * seg)355 layout_end(struct nfsd4_layout_seg *seg) 356 { 357 u64 end = seg->offset + seg->length; 358 return end >= seg->offset ? end : NFS4_MAX_UINT64; 359 } 360 361 static void layout_update_len(struct nfsd4_layout_seg * lo,u64 end)362 layout_update_len(struct nfsd4_layout_seg *lo, u64 end) 363 { 364 if (end == NFS4_MAX_UINT64) 365 lo->length = NFS4_MAX_UINT64; 366 else 367 lo->length = end - lo->offset; 368 } 369 370 static bool layouts_overlapping(struct nfs4_layout * lo,struct nfsd4_layout_seg * s)371 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) 372 { 373 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) 374 return false; 375 if (layout_end(&lo->lo_seg) <= s->offset) 376 return false; 377 if (layout_end(s) <= lo->lo_seg.offset) 378 return false; 379 return true; 380 } 381 382 static bool layouts_try_merge(struct nfsd4_layout_seg * lo,struct nfsd4_layout_seg * new)383 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) 384 { 385 if (lo->iomode != new->iomode) 386 return false; 387 if (layout_end(new) < lo->offset) 388 return false; 389 if (layout_end(lo) < new->offset) 390 return false; 391 392 lo->offset = min(lo->offset, new->offset); 393 layout_update_len(lo, max(layout_end(lo), layout_end(new))); 394 return true; 395 } 396 397 static __be32 nfsd4_recall_conflict(struct nfs4_layout_stateid * ls)398 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) 399 { 400 struct nfs4_file *fp = ls->ls_stid.sc_file; 401 struct nfs4_layout_stateid *l, *n; 402 __be32 nfserr = nfs_ok; 403 404 assert_spin_locked(&fp->fi_lock); 405 406 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { 407 if (l != ls) { 408 nfsd4_recall_file_layout(l); 409 nfserr = nfserr_recallconflict; 410 } 411 } 412 413 return nfserr; 414 } 415 416 __be32 nfsd4_insert_layout(struct nfsd4_layoutget * lgp,struct nfs4_layout_stateid * ls)417 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) 418 { 419 struct nfsd4_layout_seg *seg = &lgp->lg_seg; 420 struct nfs4_file *fp = ls->ls_stid.sc_file; 421 struct nfs4_layout *lp, *new = NULL; 422 __be32 nfserr; 423 424 spin_lock(&fp->fi_lock); 425 nfserr = nfsd4_recall_conflict(ls); 426 if (nfserr) 427 goto out; 428 spin_lock(&ls->ls_lock); 429 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 430 if (layouts_try_merge(&lp->lo_seg, seg)) 431 goto done; 432 } 433 spin_unlock(&ls->ls_lock); 434 spin_unlock(&fp->fi_lock); 435 436 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); 437 if (!new) 438 return nfserr_jukebox; 439 memcpy(&new->lo_seg, seg, sizeof(new->lo_seg)); 440 new->lo_state = ls; 441 442 spin_lock(&fp->fi_lock); 443 nfserr = nfsd4_recall_conflict(ls); 444 if (nfserr) 445 goto out; 446 spin_lock(&ls->ls_lock); 447 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { 448 if (layouts_try_merge(&lp->lo_seg, seg)) 449 goto done; 450 } 451 452 refcount_inc(&ls->ls_stid.sc_count); 453 list_add_tail(&new->lo_perstate, &ls->ls_layouts); 454 new = NULL; 455 done: 456 nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); 457 spin_unlock(&ls->ls_lock); 458 out: 459 spin_unlock(&fp->fi_lock); 460 if (new) 461 kmem_cache_free(nfs4_layout_cache, new); 462 return nfserr; 463 } 464 465 static void nfsd4_free_layouts(struct list_head * reaplist)466 nfsd4_free_layouts(struct list_head *reaplist) 467 { 468 while (!list_empty(reaplist)) { 469 struct nfs4_layout *lp = list_first_entry(reaplist, 470 struct nfs4_layout, lo_perstate); 471 472 list_del(&lp->lo_perstate); 473 nfs4_put_stid(&lp->lo_state->ls_stid); 474 kmem_cache_free(nfs4_layout_cache, lp); 475 } 476 } 477 478 static void nfsd4_return_file_layout(struct nfs4_layout * lp,struct nfsd4_layout_seg * seg,struct list_head * reaplist)479 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, 480 struct list_head *reaplist) 481 { 482 struct nfsd4_layout_seg *lo = &lp->lo_seg; 483 u64 end = layout_end(lo); 484 485 if (seg->offset <= lo->offset) { 486 if (layout_end(seg) >= end) { 487 list_move_tail(&lp->lo_perstate, reaplist); 488 return; 489 } 490 lo->offset = layout_end(seg); 491 } else { 492 /* retain the whole layout segment on a split. */ 493 if (layout_end(seg) < end) { 494 dprintk("%s: split not supported\n", __func__); 495 return; 496 } 497 end = seg->offset; 498 } 499 500 layout_update_len(lo, end); 501 } 502 503 __be32 nfsd4_return_file_layouts(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_layoutreturn * lrp)504 nfsd4_return_file_layouts(struct svc_rqst *rqstp, 505 struct nfsd4_compound_state *cstate, 506 struct nfsd4_layoutreturn *lrp) 507 { 508 struct nfs4_layout_stateid *ls; 509 struct nfs4_layout *lp, *n; 510 LIST_HEAD(reaplist); 511 __be32 nfserr; 512 int found = 0; 513 514 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid, 515 false, lrp->lr_layout_type, 516 &ls); 517 if (nfserr) { 518 trace_nfsd_layout_return_lookup_fail(&lrp->lr_sid); 519 return nfserr; 520 } 521 522 spin_lock(&ls->ls_lock); 523 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { 524 if (layouts_overlapping(lp, &lrp->lr_seg)) { 525 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); 526 found++; 527 } 528 } 529 if (!list_empty(&ls->ls_layouts)) { 530 if (found) 531 nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); 532 lrp->lrs_present = true; 533 } else { 534 trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid); 535 ls->ls_stid.sc_status |= SC_STATUS_CLOSED; 536 lrp->lrs_present = false; 537 } 538 spin_unlock(&ls->ls_lock); 539 540 mutex_unlock(&ls->ls_mutex); 541 nfs4_put_stid(&ls->ls_stid); 542 nfsd4_free_layouts(&reaplist); 543 return nfs_ok; 544 } 545 546 __be32 nfsd4_return_client_layouts(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_layoutreturn * lrp)547 nfsd4_return_client_layouts(struct svc_rqst *rqstp, 548 struct nfsd4_compound_state *cstate, 549 struct nfsd4_layoutreturn *lrp) 550 { 551 struct nfs4_layout_stateid *ls, *n; 552 struct nfs4_client *clp = cstate->clp; 553 struct nfs4_layout *lp, *t; 554 LIST_HEAD(reaplist); 555 556 lrp->lrs_present = false; 557 558 spin_lock(&clp->cl_lock); 559 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { 560 if (ls->ls_layout_type != lrp->lr_layout_type) 561 continue; 562 563 if (lrp->lr_return_type == RETURN_FSID && 564 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, 565 &cstate->current_fh.fh_handle)) 566 continue; 567 568 spin_lock(&ls->ls_lock); 569 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { 570 if (lrp->lr_seg.iomode == IOMODE_ANY || 571 lrp->lr_seg.iomode == lp->lo_seg.iomode) 572 list_move_tail(&lp->lo_perstate, &reaplist); 573 } 574 spin_unlock(&ls->ls_lock); 575 } 576 spin_unlock(&clp->cl_lock); 577 578 nfsd4_free_layouts(&reaplist); 579 return 0; 580 } 581 582 static void nfsd4_return_all_layouts(struct nfs4_layout_stateid * ls,struct list_head * reaplist)583 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, 584 struct list_head *reaplist) 585 { 586 spin_lock(&ls->ls_lock); 587 list_splice_init(&ls->ls_layouts, reaplist); 588 spin_unlock(&ls->ls_lock); 589 } 590 591 void nfsd4_return_all_client_layouts(struct nfs4_client * clp)592 nfsd4_return_all_client_layouts(struct nfs4_client *clp) 593 { 594 struct nfs4_layout_stateid *ls, *n; 595 LIST_HEAD(reaplist); 596 597 spin_lock(&clp->cl_lock); 598 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) 599 nfsd4_return_all_layouts(ls, &reaplist); 600 spin_unlock(&clp->cl_lock); 601 602 nfsd4_free_layouts(&reaplist); 603 } 604 605 void nfsd4_return_all_file_layouts(struct nfs4_client * clp,struct nfs4_file * fp)606 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) 607 { 608 struct nfs4_layout_stateid *ls, *n; 609 LIST_HEAD(reaplist); 610 611 spin_lock(&fp->fi_lock); 612 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { 613 if (ls->ls_stid.sc_client == clp) 614 nfsd4_return_all_layouts(ls, &reaplist); 615 } 616 spin_unlock(&fp->fi_lock); 617 618 nfsd4_free_layouts(&reaplist); 619 } 620 621 static void nfsd4_cb_layout_fail(struct nfs4_layout_stateid * ls,struct nfsd_file * file)622 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls, struct nfsd_file *file) 623 { 624 struct nfs4_client *clp = ls->ls_stid.sc_client; 625 char addr_str[INET6_ADDRSTRLEN]; 626 static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed"; 627 static char *envp[] = { 628 "HOME=/", 629 "TERM=linux", 630 "PATH=/sbin:/usr/sbin:/bin:/usr/bin", 631 NULL 632 }; 633 char *argv[8]; 634 int error; 635 636 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); 637 638 printk(KERN_WARNING 639 "nfsd: client %s failed to respond to layout recall. " 640 " Fencing..\n", addr_str); 641 642 argv[0] = (char *)nfsd_recall_failed; 643 argv[1] = addr_str; 644 argv[2] = file->nf_file->f_path.mnt->mnt_sb->s_id; 645 argv[3] = NULL; 646 647 error = call_usermodehelper(nfsd_recall_failed, argv, envp, 648 UMH_WAIT_PROC); 649 if (error) { 650 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", 651 addr_str, error); 652 } 653 } 654 655 static void nfsd4_cb_layout_prepare(struct nfsd4_callback * cb)656 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) 657 { 658 struct nfs4_layout_stateid *ls = 659 container_of(cb, struct nfs4_layout_stateid, ls_recall); 660 661 mutex_lock(&ls->ls_mutex); 662 nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); 663 mutex_unlock(&ls->ls_mutex); 664 } 665 666 static int nfsd4_cb_layout_done(struct nfsd4_callback * cb,struct rpc_task * task)667 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) 668 { 669 struct nfs4_layout_stateid *ls = 670 container_of(cb, struct nfs4_layout_stateid, ls_recall); 671 struct nfsd_net *nn; 672 ktime_t now, cutoff; 673 const struct nfsd4_layout_ops *ops; 674 struct nfsd_file *fl; 675 676 trace_nfsd_cb_layout_done(&ls->ls_stid.sc_stateid, task); 677 switch (task->tk_status) { 678 case 0: 679 case -NFS4ERR_DELAY: 680 /* 681 * Anything left? If not, then call it done. Note that we don't 682 * take the spinlock since this is an optimization and nothing 683 * should get added until the cb counter goes to zero. 684 */ 685 if (list_empty(&ls->ls_layouts)) 686 return 1; 687 688 /* Poll the client until it's done with the layout */ 689 now = ktime_get(); 690 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id); 691 692 /* Client gets 2 lease periods to return it */ 693 cutoff = ktime_add_ns(task->tk_start, 694 (u64)nn->nfsd4_lease * NSEC_PER_SEC * 2); 695 696 if (ktime_before(now, cutoff)) { 697 rpc_delay(task, HZ/100); /* 10 mili-seconds */ 698 return 0; 699 } 700 fallthrough; 701 default: 702 /* 703 * Unknown error or non-responding client, we'll need to fence. 704 */ 705 trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid); 706 rcu_read_lock(); 707 fl = nfsd_file_get(ls->ls_file); 708 rcu_read_unlock(); 709 if (fl) { 710 ops = nfsd4_layout_ops[ls->ls_layout_type]; 711 if (ops->fence_client) 712 ops->fence_client(ls, fl); 713 else 714 nfsd4_cb_layout_fail(ls, fl); 715 nfsd_file_put(fl); 716 } 717 return 1; 718 case -NFS4ERR_NOMATCHING_LAYOUT: 719 trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid); 720 task->tk_status = 0; 721 return 1; 722 } 723 } 724 725 static void nfsd4_cb_layout_release(struct nfsd4_callback * cb)726 nfsd4_cb_layout_release(struct nfsd4_callback *cb) 727 { 728 struct nfs4_layout_stateid *ls = 729 container_of(cb, struct nfs4_layout_stateid, ls_recall); 730 LIST_HEAD(reaplist); 731 732 trace_nfsd_layout_recall_release(&ls->ls_stid.sc_stateid); 733 734 nfsd4_return_all_layouts(ls, &reaplist); 735 nfsd4_free_layouts(&reaplist); 736 nfs4_put_stid(&ls->ls_stid); 737 } 738 739 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { 740 .prepare = nfsd4_cb_layout_prepare, 741 .done = nfsd4_cb_layout_done, 742 .release = nfsd4_cb_layout_release, 743 .opcode = OP_CB_LAYOUTRECALL, 744 }; 745 746 static bool nfsd4_layout_lm_break(struct file_lease * fl)747 nfsd4_layout_lm_break(struct file_lease *fl) 748 { 749 /* 750 * We don't want the locks code to timeout the lease for us; 751 * we'll remove it ourself if a layout isn't returned 752 * in time: 753 */ 754 fl->fl_break_time = 0; 755 nfsd4_recall_file_layout(fl->c.flc_owner); 756 return false; 757 } 758 759 static int nfsd4_layout_lm_change(struct file_lease * onlist,int arg,struct list_head * dispose)760 nfsd4_layout_lm_change(struct file_lease *onlist, int arg, 761 struct list_head *dispose) 762 { 763 BUG_ON(!(arg & F_UNLCK)); 764 return lease_modify(onlist, arg, dispose); 765 } 766 767 static const struct lease_manager_operations nfsd4_layouts_lm_ops = { 768 .lm_break = nfsd4_layout_lm_break, 769 .lm_change = nfsd4_layout_lm_change, 770 }; 771 772 int nfsd4_init_pnfs(void)773 nfsd4_init_pnfs(void) 774 { 775 int i; 776 777 for (i = 0; i < DEVID_HASH_SIZE; i++) 778 INIT_LIST_HEAD(&nfsd_devid_hash[i]); 779 780 nfs4_layout_cache = KMEM_CACHE(nfs4_layout, 0); 781 if (!nfs4_layout_cache) 782 return -ENOMEM; 783 784 nfs4_layout_stateid_cache = KMEM_CACHE(nfs4_layout_stateid, 0); 785 if (!nfs4_layout_stateid_cache) { 786 kmem_cache_destroy(nfs4_layout_cache); 787 return -ENOMEM; 788 } 789 return 0; 790 } 791 792 void nfsd4_exit_pnfs(void)793 nfsd4_exit_pnfs(void) 794 { 795 int i; 796 797 kmem_cache_destroy(nfs4_layout_cache); 798 kmem_cache_destroy(nfs4_layout_stateid_cache); 799 800 for (i = 0; i < DEVID_HASH_SIZE; i++) { 801 struct nfsd4_deviceid_map *map, *n; 802 803 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) 804 kfree(map); 805 } 806 } 807