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         if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 178                 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
 179         fput(ls->ls_file);
 180
 181         if (ls->ls_recalled)
 182                 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
 183
 184         kmem_cache_free(nfs4_layout_stateid_cache, ls);
 185 }
 186
 187 static int
 188 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
 189 {
 190         struct file_lock *fl;
 191         int status;
 192
 193         if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 194                 return 0;
 195
 196         fl = locks_alloc_lock();
 197         if (!fl)
 198                 return -ENOMEM;
 199         locks_init_lock(fl);
 200         fl->fl_lmops = &nfsd4_layouts_lm_ops;
 201         fl->fl_flags = FL_LAYOUT;
 202         fl->fl_type = F_RDLCK;
 203         fl->fl_end = OFFSET_MAX;
 204         fl->fl_owner = ls;
 205         fl->fl_pid = current->tgid;
 206         fl->fl_file = ls->ls_file;
 207
 208         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
 209         if (status) {
 210                 locks_free_lock(fl);
 211                 return status;
 212         }
 213         BUG_ON(fl != NULL);
 214         return 0;
 215 }
 216
 217 static struct nfs4_layout_stateid *
 218 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
 219                 struct nfs4_stid *parent, u32 layout_type)
 220 {
 221         struct nfs4_client *clp = cstate->clp;
 222         struct nfs4_file *fp = parent->sc_file;
 223         struct nfs4_layout_stateid *ls;
 224         struct nfs4_stid *stp;
 225
 226         stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache);
 227         if (!stp)
 228                 return NULL;
 229         stp->sc_free = nfsd4_free_layout_stateid;
 230         get_nfs4_file(fp);
 231         stp->sc_file = fp;
 232
 233         ls = layoutstateid(stp);
 234         INIT_LIST_HEAD(&ls->ls_perclnt);
 235         INIT_LIST_HEAD(&ls->ls_perfile);
 236         spin_lock_init(&ls->ls_lock);
 237         INIT_LIST_HEAD(&ls->ls_layouts);
 238         mutex_init(&ls->ls_mutex);
 239         ls->ls_layout_type = layout_type;
 240         nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
 241                         NFSPROC4_CLNT_CB_LAYOUT);
 242
 243         if (parent->sc_type == NFS4_DELEG_STID)
 244                 ls->ls_file = get_file(fp->fi_deleg_file);
 245         else
 246                 ls->ls_file = find_any_file(fp);
 247         BUG_ON(!ls->ls_file);
 248
 249         if (nfsd4_layout_setlease(ls)) {
 250                 fput(ls->ls_file);
 251                 put_nfs4_file(fp);
 252                 kmem_cache_free(nfs4_layout_stateid_cache, ls);
 253                 return NULL;
 254         }
 255
 256         spin_lock(&clp->cl_lock);
 257         stp->sc_type = NFS4_LAYOUT_STID;
 258         list_add(&ls->ls_perclnt, &clp->cl_lo_states);
 259         spin_unlock(&clp->cl_lock);
 260
 261         spin_lock(&fp->fi_lock);
 262         list_add(&ls->ls_perfile, &fp->fi_lo_states);
 263         spin_unlock(&fp->fi_lock);
 264
 265         trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
 266         return ls;
 267 }
 268
 269 __be32
 270 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
 271                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
 272                 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
 273 {
 274         struct nfs4_layout_stateid *ls;
 275         struct nfs4_stid *stid;
 276         unsigned char typemask = NFS4_LAYOUT_STID;
 277         __be32 status;
 278
 279         if (create)
 280                 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
 281
 282         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
 283                         net_generic(SVC_NET(rqstp), nfsd_net_id));
 284         if (status)
 285                 goto out;
 286
 287         if (!fh_match(&cstate->current_fh.fh_handle,
 288                       &stid->sc_file->fi_fhandle)) {
 289                 status = nfserr_bad_stateid;
 290                 goto out_put_stid;
 291         }
 292
 293         if (stid->sc_type != NFS4_LAYOUT_STID) {
 294                 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
 295                 nfs4_put_stid(stid);
 296
 297                 status = nfserr_jukebox;
 298                 if (!ls)
 299                         goto out;
 300                 mutex_lock(&ls->ls_mutex);
 301         } else {
 302                 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
 303
 304                 status = nfserr_bad_stateid;
 305                 mutex_lock(&ls->ls_mutex);
 306                 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
 307                         goto out_unlock_stid;
 308                 if (layout_type != ls->ls_layout_type)
 309                         goto out_unlock_stid;
 310         }
 311
 312         *lsp = ls;
 313         return 0;
 314
 315 out_unlock_stid:
 316         mutex_unlock(&ls->ls_mutex);
 317 out_put_stid:
 318         nfs4_put_stid(stid);
 319 out:
 320         return status;
 321 }
 322
 323 static void
 324 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 325 {
 326         spin_lock(&ls->ls_lock);
 327         if (ls->ls_recalled)
 328                 goto out_unlock;
 329
 330         ls->ls_recalled = true;
 331         atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
 332         if (list_empty(&ls->ls_layouts))
 333                 goto out_unlock;
 334
 335         trace_layout_recall(&ls->ls_stid.sc_stateid);
 336
 337         atomic_inc(&ls->ls_stid.sc_count);
 338         nfsd4_run_cb(&ls->ls_recall);
 339
 340 out_unlock:
 341         spin_unlock(&ls->ls_lock);
 342 }
 343
 344 static inline u64
 345 layout_end(struct nfsd4_layout_seg *seg)
 346 {
 347         u64 end = seg->offset + seg->length;
 348         return end >= seg->offset ? end : NFS4_MAX_UINT64;
 349 }
 350
 351 static void
 352 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
 353 {
 354         if (end == NFS4_MAX_UINT64)
 355                 lo->length = NFS4_MAX_UINT64;
 356         else
 357                 lo->length = end - lo->offset;
 358 }
 359
 360 static bool
 361 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
 362 {
 363         if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
 364                 return false;
 365         if (layout_end(&lo->lo_seg) <= s->offset)
 366                 return false;
 367         if (layout_end(s) <= lo->lo_seg.offset)
 368                 return false;
 369         return true;
 370 }
 371
 372 static bool
 373 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
 374 {
 375         if (lo->iomode != new->iomode)
 376                 return false;
 377         if (layout_end(new) < lo->offset)
 378                 return false;
 379         if (layout_end(lo) < new->offset)
 380                 return false;
 381
 382         lo->offset = min(lo->offset, new->offset);
 383         layout_update_len(lo, max(layout_end(lo), layout_end(new)));
 384         return true;
 385 }
 386
 387 static __be32
 388 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
 389 {
 390         struct nfs4_file *fp = ls->ls_stid.sc_file;
 391         struct nfs4_layout_stateid *l, *n;
 392         __be32 nfserr = nfs_ok;
 393
 394         assert_spin_locked(&fp->fi_lock);
 395
 396         list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
 397                 if (l != ls) {
 398                         nfsd4_recall_file_layout(l);
 399                         nfserr = nfserr_recallconflict;
 400                 }
 401         }
 402
 403         return nfserr;
 404 }
 405
 406 __be32
 407 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 408 {
 409         struct nfsd4_layout_seg *seg = &lgp->lg_seg;
 410         struct nfs4_file *fp = ls->ls_stid.sc_file;
 411         struct nfs4_layout *lp, *new = NULL;
 412         __be32 nfserr;
 413
 414         spin_lock(&fp->fi_lock);
 415         nfserr = nfsd4_recall_conflict(ls);
 416         if (nfserr)
 417                 goto out;
 418         spin_lock(&ls->ls_lock);
 419         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 420                 if (layouts_try_merge(&lp->lo_seg, seg))
 421                         goto done;
 422         }
 423         spin_unlock(&ls->ls_lock);
 424         spin_unlock(&fp->fi_lock);
 425
 426         new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
 427         if (!new)
 428                 return nfserr_jukebox;
 429         memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
 430         new->lo_state = ls;
 431
 432         spin_lock(&fp->fi_lock);
 433         nfserr = nfsd4_recall_conflict(ls);
 434         if (nfserr)
 435                 goto out;
 436         spin_lock(&ls->ls_lock);
 437         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 438                 if (layouts_try_merge(&lp->lo_seg, seg))
 439                         goto done;
 440         }
 441
 442         atomic_inc(&ls->ls_stid.sc_count);
 443         list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 444         new = NULL;
 445 done:
 446         nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
 447         spin_unlock(&ls->ls_lock);
 448 out:
 449         spin_unlock(&fp->fi_lock);
 450         if (new)
 451                 kmem_cache_free(nfs4_layout_cache, new);
 452         return nfserr;
 453 }
 454
 455 static void
 456 nfsd4_free_layouts(struct list_head *reaplist)
 457 {
 458         while (!list_empty(reaplist)) {
 459                 struct nfs4_layout *lp = list_first_entry(reaplist,
 460                                 struct nfs4_layout, lo_perstate);
 461
 462                 list_del(&lp->lo_perstate);
 463                 nfs4_put_stid(&lp->lo_state->ls_stid);
 464                 kmem_cache_free(nfs4_layout_cache, lp);
 465         }
 466 }
 467
 468 static void
 469 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
 470                 struct list_head *reaplist)
 471 {
 472         struct nfsd4_layout_seg *lo = &lp->lo_seg;
 473         u64 end = layout_end(lo);
 474
 475         if (seg->offset <= lo->offset) {
 476                 if (layout_end(seg) >= end) {
 477                         list_move_tail(&lp->lo_perstate, reaplist);
 478                         return;
 479                 }
 480                 lo->offset = layout_end(seg);
 481         } else {
 482                 /* retain the whole layout segment on a split. */
 483                 if (layout_end(seg) < end) {
 484                         dprintk("%s: split not supported\n", __func__);
 485                         return;
 486                 }
 487                 end = seg->offset;
 488         }
 489
 490         layout_update_len(lo, end);
 491 }
 492
 493 __be32
 494 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
 495                 struct nfsd4_compound_state *cstate,
 496                 struct nfsd4_layoutreturn *lrp)
 497 {
 498         struct nfs4_layout_stateid *ls;
 499         struct nfs4_layout *lp, *n;
 500         LIST_HEAD(reaplist);
 501         __be32 nfserr;
 502         int found = 0;
 503
 504         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
 505                                                 false, lrp->lr_layout_type,
 506                                                 &ls);
 507         if (nfserr) {
 508                 trace_layout_return_lookup_fail(&lrp->lr_sid);
 509                 return nfserr;
 510         }
 511
 512         spin_lock(&ls->ls_lock);
 513         list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
 514                 if (layouts_overlapping(lp, &lrp->lr_seg)) {
 515                         nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
 516                         found++;
 517                 }
 518         }
 519         if (!list_empty(&ls->ls_layouts)) {
 520                 if (found)
 521                         nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
 522                 lrp->lrs_present = 1;
 523         } else {
 524                 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
 525                 nfs4_unhash_stid(&ls->ls_stid);
 526                 lrp->lrs_present = 0;
 527         }
 528         spin_unlock(&ls->ls_lock);
 529
 530         mutex_unlock(&ls->ls_mutex);
 531         nfs4_put_stid(&ls->ls_stid);
 532         nfsd4_free_layouts(&reaplist);
 533         return nfs_ok;
 534 }
 535
 536 __be32
 537 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
 538                 struct nfsd4_compound_state *cstate,
 539                 struct nfsd4_layoutreturn *lrp)
 540 {
 541         struct nfs4_layout_stateid *ls, *n;
 542         struct nfs4_client *clp = cstate->clp;
 543         struct nfs4_layout *lp, *t;
 544         LIST_HEAD(reaplist);
 545
 546         lrp->lrs_present = 0;
 547
 548         spin_lock(&clp->cl_lock);
 549         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
 550                 if (ls->ls_layout_type != lrp->lr_layout_type)
 551                         continue;
 552
 553                 if (lrp->lr_return_type == RETURN_FSID &&
 554                     !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
 555                                    &cstate->current_fh.fh_handle))
 556                         continue;
 557
 558                 spin_lock(&ls->ls_lock);
 559                 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
 560                         if (lrp->lr_seg.iomode == IOMODE_ANY ||
 561                             lrp->lr_seg.iomode == lp->lo_seg.iomode)
 562                                 list_move_tail(&lp->lo_perstate, &reaplist);
 563                 }
 564                 spin_unlock(&ls->ls_lock);
 565         }
 566         spin_unlock(&clp->cl_lock);
 567
 568         nfsd4_free_layouts(&reaplist);
 569         return 0;
 570 }
 571
 572 static void
 573 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
 574                 struct list_head *reaplist)
 575 {
 576         spin_lock(&ls->ls_lock);
 577         list_splice_init(&ls->ls_layouts, reaplist);
 578         spin_unlock(&ls->ls_lock);
 579 }
 580
 581 void
 582 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
 583 {
 584         struct nfs4_layout_stateid *ls, *n;
 585         LIST_HEAD(reaplist);
 586
 587         spin_lock(&clp->cl_lock);
 588         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
 589                 nfsd4_return_all_layouts(ls, &reaplist);
 590         spin_unlock(&clp->cl_lock);
 591
 592         nfsd4_free_layouts(&reaplist);
 593 }
 594
 595 void
 596 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
 597 {
 598         struct nfs4_layout_stateid *ls, *n;
 599         LIST_HEAD(reaplist);
 600
 601         spin_lock(&fp->fi_lock);
 602         list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
 603                 if (ls->ls_stid.sc_client == clp)
 604                         nfsd4_return_all_layouts(ls, &reaplist);
 605         }
 606         spin_unlock(&fp->fi_lock);
 607
 608         nfsd4_free_layouts(&reaplist);
 609 }
 610
 611 static void
 612 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
 613 {
 614         struct nfs4_client *clp = ls->ls_stid.sc_client;
 615         char addr_str[INET6_ADDRSTRLEN];
 616         static char *envp[] = {
 617                 "HOME=/",
 618                 "TERM=linux",
 619                 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 620                 NULL
 621         };
 622         char *argv[8];
 623         int error;
 624
 625         rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
 626
 627         printk(KERN_WARNING
 628                 "nfsd: client %s failed to respond to layout recall. "
 629                 "  Fencing..\n", addr_str);
 630
 631         argv[0] = "/sbin/nfsd-recall-failed";
 632         argv[1] = addr_str;
 633         argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
 634         argv[3] = NULL;
 635
 636         error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
 637         if (error) {
 638                 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
 639                         addr_str, error);
 640         }
 641 }
 642
 643 static void
 644 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
 645 {
 646         struct nfs4_layout_stateid *ls =
 647                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 648
 649         mutex_lock(&ls->ls_mutex);
 650         nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
 651         mutex_unlock(&ls->ls_mutex);
 652 }
 653
 654 static int
 655 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
 656 {
 657         struct nfs4_layout_stateid *ls =
 658                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 659         struct nfsd_net *nn;
 660         ktime_t now, cutoff;
 661         const struct nfsd4_layout_ops *ops;
 662         LIST_HEAD(reaplist);
 663
 664
 665         switch (task->tk_status) {
 666         case 0:
 667         case -NFS4ERR_DELAY:
 668                 /*
 669                  * Anything left? If not, then call it done. Note that we don't
 670                  * take the spinlock since this is an optimization and nothing
 671                  * should get added until the cb counter goes to zero.
 672                  */
 673                 if (list_empty(&ls->ls_layouts))
 674                         return 1;
 675
 676                 /* Poll the client until it's done with the layout */
 677                 now = ktime_get();
 678                 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
 679
 680                 /* Client gets 2 lease periods to return it */
 681                 cutoff = ktime_add_ns(task->tk_start,
 682                                          nn->nfsd4_lease * NSEC_PER_SEC * 2);
 683
 684                 if (ktime_before(now, cutoff)) {
 685                         rpc_delay(task, HZ/100); /* 10 mili-seconds */
 686                         return 0;
 687                 }
 688                 /* Fallthrough */
 689         case -NFS4ERR_NOMATCHING_LAYOUT:
 690                 trace_layout_recall_done(&ls->ls_stid.sc_stateid);
 691                 task->tk_status = 0;
 692                 return 1;
 693         default:
 694                 /*
 695                  * Unknown error or non-responding client, we'll need to fence.
 696                  */
 697                 trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
 698
 699                 ops = nfsd4_layout_ops[ls->ls_layout_type];
 700                 if (ops->fence_client)
 701                         ops->fence_client(ls);
 702                 else
 703                         nfsd4_cb_layout_fail(ls);
 704                 return -1;
 705         }
 706 }
 707
 708 static void
 709 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
 710 {
 711         struct nfs4_layout_stateid *ls =
 712                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 713         LIST_HEAD(reaplist);
 714
 715         trace_layout_recall_release(&ls->ls_stid.sc_stateid);
 716
 717         nfsd4_return_all_layouts(ls, &reaplist);
 718         nfsd4_free_layouts(&reaplist);
 719         nfs4_put_stid(&ls->ls_stid);
 720 }
 721
 722 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
 723         .prepare        = nfsd4_cb_layout_prepare,
 724         .done           = nfsd4_cb_layout_done,
 725         .release        = nfsd4_cb_layout_release,
 726 };
 727
 728 static bool
 729 nfsd4_layout_lm_break(struct file_lock *fl)
 730 {
 731         /*
 732          * We don't want the locks code to timeout the lease for us;
 733          * we'll remove it ourself if a layout isn't returned
 734          * in time:
 735          */
 736         fl->fl_break_time = 0;
 737         nfsd4_recall_file_layout(fl->fl_owner);
 738         return false;
 739 }
 740
 741 static int
 742 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
 743                 struct list_head *dispose)
 744 {
 745         BUG_ON(!(arg & F_UNLCK));
 746         return lease_modify(onlist, arg, dispose);
 747 }
 748
 749 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
 750         .lm_break       = nfsd4_layout_lm_break,
 751         .lm_change      = nfsd4_layout_lm_change,
 752 };
 753
 754 int
 755 nfsd4_init_pnfs(void)
 756 {
 757         int i;
 758
 759         for (i = 0; i < DEVID_HASH_SIZE; i++)
 760                 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 761
 762         nfs4_layout_cache = kmem_cache_create("nfs4_layout",
 763                         sizeof(struct nfs4_layout), 0, 0, NULL);
 764         if (!nfs4_layout_cache)
 765                 return -ENOMEM;
 766
 767         nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
 768                         sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
 769         if (!nfs4_layout_stateid_cache) {
 770                 kmem_cache_destroy(nfs4_layout_cache);
 771                 return -ENOMEM;
 772         }
 773         return 0;
 774 }
 775
 776 void
 777 nfsd4_exit_pnfs(void)
 778 {
 779         int i;
 780
 781         kmem_cache_destroy(nfs4_layout_cache);
 782         kmem_cache_destroy(nfs4_layout_stateid_cache);
 783
 784         for (i = 0; i < DEVID_HASH_SIZE; i++) {
 785                 struct nfsd4_deviceid_map *map, *n;
 786
 787                 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
 788                         kfree(map);
 789         }
 790 }