fs/nfsd/nfs4layouts.c

   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
  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 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
 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
 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 *
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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 }