fs/nfsd/nfs4layouts.c

   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 }