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                                         nfsd4_free_layout_stateid);
 228         if (!stp)
 229                 return NULL;
 230
 231         get_nfs4_file(fp);
 232         stp->sc_file = fp;
 233
 234         ls = layoutstateid(stp);
 235         INIT_LIST_HEAD(&ls->ls_perclnt);
 236         INIT_LIST_HEAD(&ls->ls_perfile);
 237         spin_lock_init(&ls->ls_lock);
 238         INIT_LIST_HEAD(&ls->ls_layouts);
 239         mutex_init(&ls->ls_mutex);
 240         ls->ls_layout_type = layout_type;
 241         nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
 242                         NFSPROC4_CLNT_CB_LAYOUT);
 243
 244         if (parent->sc_type == NFS4_DELEG_STID)
 245                 ls->ls_file = get_file(fp->fi_deleg_file);
 246         else
 247                 ls->ls_file = find_any_file(fp);
 248         BUG_ON(!ls->ls_file);
 249
 250         if (nfsd4_layout_setlease(ls)) {
 251                 fput(ls->ls_file);
 252                 put_nfs4_file(fp);
 253                 kmem_cache_free(nfs4_layout_stateid_cache, ls);
 254                 return NULL;
 255         }
 256
 257         spin_lock(&clp->cl_lock);
 258         stp->sc_type = NFS4_LAYOUT_STID;
 259         list_add(&ls->ls_perclnt, &clp->cl_lo_states);
 260         spin_unlock(&clp->cl_lock);
 261
 262         spin_lock(&fp->fi_lock);
 263         list_add(&ls->ls_perfile, &fp->fi_lo_states);
 264         spin_unlock(&fp->fi_lock);
 265
 266         trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
 267         return ls;
 268 }
 269
 270 __be32
 271 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
 272                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
 273                 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
 274 {
 275         struct nfs4_layout_stateid *ls;
 276         struct nfs4_stid *stid;
 277         unsigned char typemask = NFS4_LAYOUT_STID;
 278         __be32 status;
 279
 280         if (create)
 281                 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
 282
 283         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
 284                         net_generic(SVC_NET(rqstp), nfsd_net_id));
 285         if (status)
 286                 goto out;
 287
 288         if (!fh_match(&cstate->current_fh.fh_handle,
 289                       &stid->sc_file->fi_fhandle)) {
 290                 status = nfserr_bad_stateid;
 291                 goto out_put_stid;
 292         }
 293
 294         if (stid->sc_type != NFS4_LAYOUT_STID) {
 295                 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
 296                 nfs4_put_stid(stid);
 297
 298                 status = nfserr_jukebox;
 299                 if (!ls)
 300                         goto out;
 301                 mutex_lock(&ls->ls_mutex);
 302         } else {
 303                 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
 304
 305                 status = nfserr_bad_stateid;
 306                 mutex_lock(&ls->ls_mutex);
 307                 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
 308                         goto out_unlock_stid;
 309                 if (layout_type != ls->ls_layout_type)
 310                         goto out_unlock_stid;
 311         }
 312
 313         *lsp = ls;
 314         return 0;
 315
 316 out_unlock_stid:
 317         mutex_unlock(&ls->ls_mutex);
 318 out_put_stid:
 319         nfs4_put_stid(stid);
 320 out:
 321         return status;
 322 }
 323
 324 static void
 325 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 326 {
 327         spin_lock(&ls->ls_lock);
 328         if (ls->ls_recalled)
 329                 goto out_unlock;
 330
 331         ls->ls_recalled = true;
 332         atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
 333         if (list_empty(&ls->ls_layouts))
 334                 goto out_unlock;
 335
 336         trace_layout_recall(&ls->ls_stid.sc_stateid);
 337
 338         atomic_inc(&ls->ls_stid.sc_count);
 339         nfsd4_run_cb(&ls->ls_recall);
 340
 341 out_unlock:
 342         spin_unlock(&ls->ls_lock);
 343 }
 344
 345 static inline u64
 346 layout_end(struct nfsd4_layout_seg *seg)
 347 {
 348         u64 end = seg->offset + seg->length;
 349         return end >= seg->offset ? end : NFS4_MAX_UINT64;
 350 }
 351
 352 static void
 353 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
 354 {
 355         if (end == NFS4_MAX_UINT64)
 356                 lo->length = NFS4_MAX_UINT64;
 357         else
 358                 lo->length = end - lo->offset;
 359 }
 360
 361 static bool
 362 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
 363 {
 364         if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
 365                 return false;
 366         if (layout_end(&lo->lo_seg) <= s->offset)
 367                 return false;
 368         if (layout_end(s) <= lo->lo_seg.offset)
 369                 return false;
 370         return true;
 371 }
 372
 373 static bool
 374 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
 375 {
 376         if (lo->iomode != new->iomode)
 377                 return false;
 378         if (layout_end(new) < lo->offset)
 379                 return false;
 380         if (layout_end(lo) < new->offset)
 381                 return false;
 382
 383         lo->offset = min(lo->offset, new->offset);
 384         layout_update_len(lo, max(layout_end(lo), layout_end(new)));
 385         return true;
 386 }
 387
 388 static __be32
 389 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
 390 {
 391         struct nfs4_file *fp = ls->ls_stid.sc_file;
 392         struct nfs4_layout_stateid *l, *n;
 393         __be32 nfserr = nfs_ok;
 394
 395         assert_spin_locked(&fp->fi_lock);
 396
 397         list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
 398                 if (l != ls) {
 399                         nfsd4_recall_file_layout(l);
 400                         nfserr = nfserr_recallconflict;
 401                 }
 402         }
 403
 404         return nfserr;
 405 }
 406
 407 __be32
 408 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 409 {
 410         struct nfsd4_layout_seg *seg = &lgp->lg_seg;
 411         struct nfs4_file *fp = ls->ls_stid.sc_file;
 412         struct nfs4_layout *lp, *new = NULL;
 413         __be32 nfserr;
 414
 415         spin_lock(&fp->fi_lock);
 416         nfserr = nfsd4_recall_conflict(ls);
 417         if (nfserr)
 418                 goto out;
 419         spin_lock(&ls->ls_lock);
 420         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 421                 if (layouts_try_merge(&lp->lo_seg, seg))
 422                         goto done;
 423         }
 424         spin_unlock(&ls->ls_lock);
 425         spin_unlock(&fp->fi_lock);
 426
 427         new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
 428         if (!new)
 429                 return nfserr_jukebox;
 430         memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
 431         new->lo_state = ls;
 432
 433         spin_lock(&fp->fi_lock);
 434         nfserr = nfsd4_recall_conflict(ls);
 435         if (nfserr)
 436                 goto out;
 437         spin_lock(&ls->ls_lock);
 438         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 439                 if (layouts_try_merge(&lp->lo_seg, seg))
 440                         goto done;
 441         }
 442
 443         atomic_inc(&ls->ls_stid.sc_count);
 444         list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 445         new = NULL;
 446 done:
 447         nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
 448         spin_unlock(&ls->ls_lock);
 449 out:
 450         spin_unlock(&fp->fi_lock);
 451         if (new)
 452                 kmem_cache_free(nfs4_layout_cache, new);
 453         return nfserr;
 454 }
 455
 456 static void
 457 nfsd4_free_layouts(struct list_head *reaplist)
 458 {
 459         while (!list_empty(reaplist)) {
 460                 struct nfs4_layout *lp = list_first_entry(reaplist,
 461                                 struct nfs4_layout, lo_perstate);
 462
 463                 list_del(&lp->lo_perstate);
 464                 nfs4_put_stid(&lp->lo_state->ls_stid);
 465                 kmem_cache_free(nfs4_layout_cache, lp);
 466         }
 467 }
 468
 469 static void
 470 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
 471                 struct list_head *reaplist)
 472 {
 473         struct nfsd4_layout_seg *lo = &lp->lo_seg;
 474         u64 end = layout_end(lo);
 475
 476         if (seg->offset <= lo->offset) {
 477                 if (layout_end(seg) >= end) {
 478                         list_move_tail(&lp->lo_perstate, reaplist);
 479                         return;
 480                 }
 481                 lo->offset = layout_end(seg);
 482         } else {
 483                 /* retain the whole layout segment on a split. */
 484                 if (layout_end(seg) < end) {
 485                         dprintk("%s: split not supported\n", __func__);
 486                         return;
 487                 }
 488                 end = seg->offset;
 489         }
 490
 491         layout_update_len(lo, end);
 492 }
 493
 494 __be32
 495 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
 496                 struct nfsd4_compound_state *cstate,
 497                 struct nfsd4_layoutreturn *lrp)
 498 {
 499         struct nfs4_layout_stateid *ls;
 500         struct nfs4_layout *lp, *n;
 501         LIST_HEAD(reaplist);
 502         __be32 nfserr;
 503         int found = 0;
 504
 505         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
 506                                                 false, lrp->lr_layout_type,
 507                                                 &ls);
 508         if (nfserr) {
 509                 trace_layout_return_lookup_fail(&lrp->lr_sid);
 510                 return nfserr;
 511         }
 512
 513         spin_lock(&ls->ls_lock);
 514         list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
 515                 if (layouts_overlapping(lp, &lrp->lr_seg)) {
 516                         nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
 517                         found++;
 518                 }
 519         }
 520         if (!list_empty(&ls->ls_layouts)) {
 521                 if (found)
 522                         nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
 523                 lrp->lrs_present = 1;
 524         } else {
 525                 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
 526                 nfs4_unhash_stid(&ls->ls_stid);
 527                 lrp->lrs_present = 0;
 528         }
 529         spin_unlock(&ls->ls_lock);
 530
 531         mutex_unlock(&ls->ls_mutex);
 532         nfs4_put_stid(&ls->ls_stid);
 533         nfsd4_free_layouts(&reaplist);
 534         return nfs_ok;
 535 }
 536
 537 __be32
 538 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
 539                 struct nfsd4_compound_state *cstate,
 540                 struct nfsd4_layoutreturn *lrp)
 541 {
 542         struct nfs4_layout_stateid *ls, *n;
 543         struct nfs4_client *clp = cstate->clp;
 544         struct nfs4_layout *lp, *t;
 545         LIST_HEAD(reaplist);
 546
 547         lrp->lrs_present = 0;
 548
 549         spin_lock(&clp->cl_lock);
 550         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
 551                 if (ls->ls_layout_type != lrp->lr_layout_type)
 552                         continue;
 553
 554                 if (lrp->lr_return_type == RETURN_FSID &&
 555                     !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
 556                                    &cstate->current_fh.fh_handle))
 557                         continue;
 558
 559                 spin_lock(&ls->ls_lock);
 560                 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
 561                         if (lrp->lr_seg.iomode == IOMODE_ANY ||
 562                             lrp->lr_seg.iomode == lp->lo_seg.iomode)
 563                                 list_move_tail(&lp->lo_perstate, &reaplist);
 564                 }
 565                 spin_unlock(&ls->ls_lock);
 566         }
 567         spin_unlock(&clp->cl_lock);
 568
 569         nfsd4_free_layouts(&reaplist);
 570         return 0;
 571 }
 572
 573 static void
 574 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
 575                 struct list_head *reaplist)
 576 {
 577         spin_lock(&ls->ls_lock);
 578         list_splice_init(&ls->ls_layouts, reaplist);
 579         spin_unlock(&ls->ls_lock);
 580 }
 581
 582 void
 583 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
 584 {
 585         struct nfs4_layout_stateid *ls, *n;
 586         LIST_HEAD(reaplist);
 587
 588         spin_lock(&clp->cl_lock);
 589         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
 590                 nfsd4_return_all_layouts(ls, &reaplist);
 591         spin_unlock(&clp->cl_lock);
 592
 593         nfsd4_free_layouts(&reaplist);
 594 }
 595
 596 void
 597 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
 598 {
 599         struct nfs4_layout_stateid *ls, *n;
 600         LIST_HEAD(reaplist);
 601
 602         spin_lock(&fp->fi_lock);
 603         list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
 604                 if (ls->ls_stid.sc_client == clp)
 605                         nfsd4_return_all_layouts(ls, &reaplist);
 606         }
 607         spin_unlock(&fp->fi_lock);
 608
 609         nfsd4_free_layouts(&reaplist);
 610 }
 611
 612 static void
 613 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
 614 {
 615         struct nfs4_client *clp = ls->ls_stid.sc_client;
 616         char addr_str[INET6_ADDRSTRLEN];
 617         static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
 618         static char *envp[] = {
 619                 "HOME=/",
 620                 "TERM=linux",
 621                 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 622                 NULL
 623         };
 624         char *argv[8];
 625         int error;
 626
 627         rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
 628
 629         printk(KERN_WARNING
 630                 "nfsd: client %s failed to respond to layout recall. "
 631                 "  Fencing..\n", addr_str);
 632
 633         argv[0] = (char *)nfsd_recall_failed;
 634         argv[1] = addr_str;
 635         argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
 636         argv[3] = NULL;
 637
 638         error = call_usermodehelper(nfsd_recall_failed, argv, envp,
 639                                     UMH_WAIT_PROC);
 640         if (error) {
 641                 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
 642                         addr_str, error);
 643         }
 644 }
 645
 646 static void
 647 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
 648 {
 649         struct nfs4_layout_stateid *ls =
 650                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 651
 652         mutex_lock(&ls->ls_mutex);
 653         nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
 654         mutex_unlock(&ls->ls_mutex);
 655 }
 656
 657 static int
 658 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
 659 {
 660         struct nfs4_layout_stateid *ls =
 661                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 662         struct nfsd_net *nn;
 663         ktime_t now, cutoff;
 664         const struct nfsd4_layout_ops *ops;
 665         LIST_HEAD(reaplist);
 666
 667
 668         switch (task->tk_status) {
 669         case 0:
 670         case -NFS4ERR_DELAY:
 671                 /*
 672                  * Anything left? If not, then call it done. Note that we don't
 673                  * take the spinlock since this is an optimization and nothing
 674                  * should get added until the cb counter goes to zero.
 675                  */
 676                 if (list_empty(&ls->ls_layouts))
 677                         return 1;
 678
 679                 /* Poll the client until it's done with the layout */
 680                 now = ktime_get();
 681                 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
 682
 683                 /* Client gets 2 lease periods to return it */
 684                 cutoff = ktime_add_ns(task->tk_start,
 685                                          nn->nfsd4_lease * NSEC_PER_SEC * 2);
 686
 687                 if (ktime_before(now, cutoff)) {
 688                         rpc_delay(task, HZ/100); /* 10 mili-seconds */
 689                         return 0;
 690                 }
 691                 /* Fallthrough */
 692         default:
 693                 /*
 694                  * Unknown error or non-responding client, we'll need to fence.
 695                  */
 696                 trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
 697
 698                 ops = nfsd4_layout_ops[ls->ls_layout_type];
 699                 if (ops->fence_client)
 700                         ops->fence_client(ls);
 701                 else
 702                         nfsd4_cb_layout_fail(ls);
 703                 return -1;
 704         case -NFS4ERR_NOMATCHING_LAYOUT:
 705                 trace_layout_recall_done(&ls->ls_stid.sc_stateid);
 706                 task->tk_status = 0;
 707                 return 1;
 708         }
 709 }
 710
 711 static void
 712 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
 713 {
 714         struct nfs4_layout_stateid *ls =
 715                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 716         LIST_HEAD(reaplist);
 717
 718         trace_layout_recall_release(&ls->ls_stid.sc_stateid);
 719
 720         nfsd4_return_all_layouts(ls, &reaplist);
 721         nfsd4_free_layouts(&reaplist);
 722         nfs4_put_stid(&ls->ls_stid);
 723 }
 724
 725 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
 726         .prepare        = nfsd4_cb_layout_prepare,
 727         .done           = nfsd4_cb_layout_done,
 728         .release        = nfsd4_cb_layout_release,
 729 };
 730
 731 static bool
 732 nfsd4_layout_lm_break(struct file_lock *fl)
 733 {
 734         /*
 735          * We don't want the locks code to timeout the lease for us;
 736          * we'll remove it ourself if a layout isn't returned
 737          * in time:
 738          */
 739         fl->fl_break_time = 0;
 740         nfsd4_recall_file_layout(fl->fl_owner);
 741         return false;
 742 }
 743
 744 static int
 745 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
 746                 struct list_head *dispose)
 747 {
 748         BUG_ON(!(arg & F_UNLCK));
 749         return lease_modify(onlist, arg, dispose);
 750 }
 751
 752 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
 753         .lm_break       = nfsd4_layout_lm_break,
 754         .lm_change      = nfsd4_layout_lm_change,
 755 };
 756
 757 int
 758 nfsd4_init_pnfs(void)
 759 {
 760         int i;
 761
 762         for (i = 0; i < DEVID_HASH_SIZE; i++)
 763                 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 764
 765         nfs4_layout_cache = kmem_cache_create("nfs4_layout",
 766                         sizeof(struct nfs4_layout), 0, 0, NULL);
 767         if (!nfs4_layout_cache)
 768                 return -ENOMEM;
 769
 770         nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
 771                         sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
 772         if (!nfs4_layout_stateid_cache) {
 773                 kmem_cache_destroy(nfs4_layout_cache);
 774                 return -ENOMEM;
 775         }
 776         return 0;
 777 }
 778
 779 void
 780 nfsd4_exit_pnfs(void)
 781 {
 782         int i;
 783
 784         kmem_cache_destroy(nfs4_layout_cache);
 785         kmem_cache_destroy(nfs4_layout_stateid_cache);
 786
 787         for (i = 0; i < DEVID_HASH_SIZE; i++) {
 788                 struct nfsd4_deviceid_map *map, *n;
 789
 790                 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
 791                         kfree(map);
 792         }
 793 }