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 lock_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         /*
 137          * If flex file is configured, use it by default. Otherwise
 138          * check if the file system supports exporting a block-like layout.
 139          * If the block device supports reservations prefer the SCSI layout,
 140          * otherwise advertise the block layout.
 141          */
 142 #ifdef CONFIG_NFSD_FLEXFILELAYOUT
 143         exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
 144 #endif
 145 #ifdef CONFIG_NFSD_BLOCKLAYOUT
 146         /* overwrite flex file layout selection if needed */
 147         if (sb->s_export_op->get_uuid &&
 148             sb->s_export_op->map_blocks &&
 149             sb->s_export_op->commit_blocks)
 150                 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME;
 151 #endif
 152 #ifdef CONFIG_NFSD_SCSILAYOUT
 153         /* overwrite block layout selection if needed */
 154         if (sb->s_export_op->map_blocks &&
 155             sb->s_export_op->commit_blocks &&
 156             sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops)
 157                 exp->ex_layout_types |= 1 << LAYOUT_SCSI;
 158 #endif
 159 }
 160
 161 static void
 162 nfsd4_free_layout_stateid(struct nfs4_stid *stid)
 163 {
 164         struct nfs4_layout_stateid *ls = layoutstateid(stid);
 165         struct nfs4_client *clp = ls->ls_stid.sc_client;
 166         struct nfs4_file *fp = ls->ls_stid.sc_file;
 167
 168         trace_layoutstate_free(&ls->ls_stid.sc_stateid);
 169
 170         spin_lock(&clp->cl_lock);
 171         list_del_init(&ls->ls_perclnt);
 172         spin_unlock(&clp->cl_lock);
 173
 174         spin_lock(&fp->fi_lock);
 175         list_del_init(&ls->ls_perfile);
 176         spin_unlock(&fp->fi_lock);
 177
 178         if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 179                 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
 180         fput(ls->ls_file);
 181
 182         if (ls->ls_recalled)
 183                 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
 184
 185         kmem_cache_free(nfs4_layout_stateid_cache, ls);
 186 }
 187
 188 static int
 189 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
 190 {
 191         struct file_lock *fl;
 192         int status;
 193
 194         if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 195                 return 0;
 196
 197         fl = locks_alloc_lock();
 198         if (!fl)
 199                 return -ENOMEM;
 200         locks_init_lock(fl);
 201         fl->fl_lmops = &nfsd4_layouts_lm_ops;
 202         fl->fl_flags = FL_LAYOUT;
 203         fl->fl_type = F_RDLCK;
 204         fl->fl_end = OFFSET_MAX;
 205         fl->fl_owner = ls;
 206         fl->fl_pid = current->tgid;
 207         fl->fl_file = ls->ls_file;
 208
 209         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
 210         if (status) {
 211                 locks_free_lock(fl);
 212                 return status;
 213         }
 214         BUG_ON(fl != NULL);
 215         return 0;
 216 }
 217
 218 static struct nfs4_layout_stateid *
 219 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
 220                 struct nfs4_stid *parent, u32 layout_type)
 221 {
 222         struct nfs4_client *clp = cstate->clp;
 223         struct nfs4_file *fp = parent->sc_file;
 224         struct nfs4_layout_stateid *ls;
 225         struct nfs4_stid *stp;
 226
 227         stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache,
 228                                         nfsd4_free_layout_stateid);
 229         if (!stp)
 230                 return NULL;
 231
 232         get_nfs4_file(fp);
 233         stp->sc_file = fp;
 234
 235         ls = layoutstateid(stp);
 236         INIT_LIST_HEAD(&ls->ls_perclnt);
 237         INIT_LIST_HEAD(&ls->ls_perfile);
 238         spin_lock_init(&ls->ls_lock);
 239         INIT_LIST_HEAD(&ls->ls_layouts);
 240         mutex_init(&ls->ls_mutex);
 241         ls->ls_layout_type = layout_type;
 242         nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
 243                         NFSPROC4_CLNT_CB_LAYOUT);
 244
 245         if (parent->sc_type == NFS4_DELEG_STID)
 246                 ls->ls_file = get_file(fp->fi_deleg_file);
 247         else
 248                 ls->ls_file = find_any_file(fp);
 249         BUG_ON(!ls->ls_file);
 250
 251         if (nfsd4_layout_setlease(ls)) {
 252                 fput(ls->ls_file);
 253                 put_nfs4_file(fp);
 254                 kmem_cache_free(nfs4_layout_stateid_cache, ls);
 255                 return NULL;
 256         }
 257
 258         spin_lock(&clp->cl_lock);
 259         stp->sc_type = NFS4_LAYOUT_STID;
 260         list_add(&ls->ls_perclnt, &clp->cl_lo_states);
 261         spin_unlock(&clp->cl_lock);
 262
 263         spin_lock(&fp->fi_lock);
 264         list_add(&ls->ls_perfile, &fp->fi_lo_states);
 265         spin_unlock(&fp->fi_lock);
 266
 267         trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
 268         return ls;
 269 }
 270
 271 __be32
 272 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
 273                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
 274                 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
 275 {
 276         struct nfs4_layout_stateid *ls;
 277         struct nfs4_stid *stid;
 278         unsigned char typemask = NFS4_LAYOUT_STID;
 279         __be32 status;
 280
 281         if (create)
 282                 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
 283
 284         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
 285                         net_generic(SVC_NET(rqstp), nfsd_net_id));
 286         if (status)
 287                 goto out;
 288
 289         if (!fh_match(&cstate->current_fh.fh_handle,
 290                       &stid->sc_file->fi_fhandle)) {
 291                 status = nfserr_bad_stateid;
 292                 goto out_put_stid;
 293         }
 294
 295         if (stid->sc_type != NFS4_LAYOUT_STID) {
 296                 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
 297                 nfs4_put_stid(stid);
 298
 299                 status = nfserr_jukebox;
 300                 if (!ls)
 301                         goto out;
 302                 mutex_lock(&ls->ls_mutex);
 303         } else {
 304                 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
 305
 306                 status = nfserr_bad_stateid;
 307                 mutex_lock(&ls->ls_mutex);
 308                 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
 309                         goto out_unlock_stid;
 310                 if (layout_type != ls->ls_layout_type)
 311                         goto out_unlock_stid;
 312         }
 313
 314         *lsp = ls;
 315         return 0;
 316
 317 out_unlock_stid:
 318         mutex_unlock(&ls->ls_mutex);
 319 out_put_stid:
 320         nfs4_put_stid(stid);
 321 out:
 322         return status;
 323 }
 324
 325 static void
 326 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 327 {
 328         spin_lock(&ls->ls_lock);
 329         if (ls->ls_recalled)
 330                 goto out_unlock;
 331
 332         ls->ls_recalled = true;
 333         atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
 334         if (list_empty(&ls->ls_layouts))
 335                 goto out_unlock;
 336
 337         trace_layout_recall(&ls->ls_stid.sc_stateid);
 338
 339         atomic_inc(&ls->ls_stid.sc_count);
 340         nfsd4_run_cb(&ls->ls_recall);
 341
 342 out_unlock:
 343         spin_unlock(&ls->ls_lock);
 344 }
 345
 346 static inline u64
 347 layout_end(struct nfsd4_layout_seg *seg)
 348 {
 349         u64 end = seg->offset + seg->length;
 350         return end >= seg->offset ? end : NFS4_MAX_UINT64;
 351 }
 352
 353 static void
 354 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
 355 {
 356         if (end == NFS4_MAX_UINT64)
 357                 lo->length = NFS4_MAX_UINT64;
 358         else
 359                 lo->length = end - lo->offset;
 360 }
 361
 362 static bool
 363 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
 364 {
 365         if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
 366                 return false;
 367         if (layout_end(&lo->lo_seg) <= s->offset)
 368                 return false;
 369         if (layout_end(s) <= lo->lo_seg.offset)
 370                 return false;
 371         return true;
 372 }
 373
 374 static bool
 375 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
 376 {
 377         if (lo->iomode != new->iomode)
 378                 return false;
 379         if (layout_end(new) < lo->offset)
 380                 return false;
 381         if (layout_end(lo) < new->offset)
 382                 return false;
 383
 384         lo->offset = min(lo->offset, new->offset);
 385         layout_update_len(lo, max(layout_end(lo), layout_end(new)));
 386         return true;
 387 }
 388
 389 static __be32
 390 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
 391 {
 392         struct nfs4_file *fp = ls->ls_stid.sc_file;
 393         struct nfs4_layout_stateid *l, *n;
 394         __be32 nfserr = nfs_ok;
 395
 396         assert_spin_locked(&fp->fi_lock);
 397
 398         list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
 399                 if (l != ls) {
 400                         nfsd4_recall_file_layout(l);
 401                         nfserr = nfserr_recallconflict;
 402                 }
 403         }
 404
 405         return nfserr;
 406 }
 407
 408 __be32
 409 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 410 {
 411         struct nfsd4_layout_seg *seg = &lgp->lg_seg;
 412         struct nfs4_file *fp = ls->ls_stid.sc_file;
 413         struct nfs4_layout *lp, *new = NULL;
 414         __be32 nfserr;
 415
 416         spin_lock(&fp->fi_lock);
 417         nfserr = nfsd4_recall_conflict(ls);
 418         if (nfserr)
 419                 goto out;
 420         spin_lock(&ls->ls_lock);
 421         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 422                 if (layouts_try_merge(&lp->lo_seg, seg))
 423                         goto done;
 424         }
 425         spin_unlock(&ls->ls_lock);
 426         spin_unlock(&fp->fi_lock);
 427
 428         new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
 429         if (!new)
 430                 return nfserr_jukebox;
 431         memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
 432         new->lo_state = ls;
 433
 434         spin_lock(&fp->fi_lock);
 435         nfserr = nfsd4_recall_conflict(ls);
 436         if (nfserr)
 437                 goto out;
 438         spin_lock(&ls->ls_lock);
 439         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 440                 if (layouts_try_merge(&lp->lo_seg, seg))
 441                         goto done;
 442         }
 443
 444         atomic_inc(&ls->ls_stid.sc_count);
 445         list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 446         new = NULL;
 447 done:
 448         nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
 449         spin_unlock(&ls->ls_lock);
 450 out:
 451         spin_unlock(&fp->fi_lock);
 452         if (new)
 453                 kmem_cache_free(nfs4_layout_cache, new);
 454         return nfserr;
 455 }
 456
 457 static void
 458 nfsd4_free_layouts(struct list_head *reaplist)
 459 {
 460         while (!list_empty(reaplist)) {
 461                 struct nfs4_layout *lp = list_first_entry(reaplist,
 462                                 struct nfs4_layout, lo_perstate);
 463
 464                 list_del(&lp->lo_perstate);
 465                 nfs4_put_stid(&lp->lo_state->ls_stid);
 466                 kmem_cache_free(nfs4_layout_cache, lp);
 467         }
 468 }
 469
 470 static void
 471 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
 472                 struct list_head *reaplist)
 473 {
 474         struct nfsd4_layout_seg *lo = &lp->lo_seg;
 475         u64 end = layout_end(lo);
 476
 477         if (seg->offset <= lo->offset) {
 478                 if (layout_end(seg) >= end) {
 479                         list_move_tail(&lp->lo_perstate, reaplist);
 480                         return;
 481                 }
 482                 lo->offset = layout_end(seg);
 483         } else {
 484                 /* retain the whole layout segment on a split. */
 485                 if (layout_end(seg) < end) {
 486                         dprintk("%s: split not supported\n", __func__);
 487                         return;
 488                 }
 489                 end = seg->offset;
 490         }
 491
 492         layout_update_len(lo, end);
 493 }
 494
 495 __be32
 496 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
 497                 struct nfsd4_compound_state *cstate,
 498                 struct nfsd4_layoutreturn *lrp)
 499 {
 500         struct nfs4_layout_stateid *ls;
 501         struct nfs4_layout *lp, *n;
 502         LIST_HEAD(reaplist);
 503         __be32 nfserr;
 504         int found = 0;
 505
 506         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
 507                                                 false, lrp->lr_layout_type,
 508                                                 &ls);
 509         if (nfserr) {
 510                 trace_layout_return_lookup_fail(&lrp->lr_sid);
 511                 return nfserr;
 512         }
 513
 514         spin_lock(&ls->ls_lock);
 515         list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
 516                 if (layouts_overlapping(lp, &lrp->lr_seg)) {
 517                         nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
 518                         found++;
 519                 }
 520         }
 521         if (!list_empty(&ls->ls_layouts)) {
 522                 if (found)
 523                         nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
 524                 lrp->lrs_present = 1;
 525         } else {
 526                 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
 527                 nfs4_unhash_stid(&ls->ls_stid);
 528                 lrp->lrs_present = 0;
 529         }
 530         spin_unlock(&ls->ls_lock);
 531
 532         mutex_unlock(&ls->ls_mutex);
 533         nfs4_put_stid(&ls->ls_stid);
 534         nfsd4_free_layouts(&reaplist);
 535         return nfs_ok;
 536 }
 537
 538 __be32
 539 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
 540                 struct nfsd4_compound_state *cstate,
 541                 struct nfsd4_layoutreturn *lrp)
 542 {
 543         struct nfs4_layout_stateid *ls, *n;
 544         struct nfs4_client *clp = cstate->clp;
 545         struct nfs4_layout *lp, *t;
 546         LIST_HEAD(reaplist);
 547
 548         lrp->lrs_present = 0;
 549
 550         spin_lock(&clp->cl_lock);
 551         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
 552                 if (ls->ls_layout_type != lrp->lr_layout_type)
 553                         continue;
 554
 555                 if (lrp->lr_return_type == RETURN_FSID &&
 556                     !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
 557                                    &cstate->current_fh.fh_handle))
 558                         continue;
 559
 560                 spin_lock(&ls->ls_lock);
 561                 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
 562                         if (lrp->lr_seg.iomode == IOMODE_ANY ||
 563                             lrp->lr_seg.iomode == lp->lo_seg.iomode)
 564                                 list_move_tail(&lp->lo_perstate, &reaplist);
 565                 }
 566                 spin_unlock(&ls->ls_lock);
 567         }
 568         spin_unlock(&clp->cl_lock);
 569
 570         nfsd4_free_layouts(&reaplist);
 571         return 0;
 572 }
 573
 574 static void
 575 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
 576                 struct list_head *reaplist)
 577 {
 578         spin_lock(&ls->ls_lock);
 579         list_splice_init(&ls->ls_layouts, reaplist);
 580         spin_unlock(&ls->ls_lock);
 581 }
 582
 583 void
 584 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
 585 {
 586         struct nfs4_layout_stateid *ls, *n;
 587         LIST_HEAD(reaplist);
 588
 589         spin_lock(&clp->cl_lock);
 590         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
 591                 nfsd4_return_all_layouts(ls, &reaplist);
 592         spin_unlock(&clp->cl_lock);
 593
 594         nfsd4_free_layouts(&reaplist);
 595 }
 596
 597 void
 598 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
 599 {
 600         struct nfs4_layout_stateid *ls, *n;
 601         LIST_HEAD(reaplist);
 602
 603         spin_lock(&fp->fi_lock);
 604         list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
 605                 if (ls->ls_stid.sc_client == clp)
 606                         nfsd4_return_all_layouts(ls, &reaplist);
 607         }
 608         spin_unlock(&fp->fi_lock);
 609
 610         nfsd4_free_layouts(&reaplist);
 611 }
 612
 613 static void
 614 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
 615 {
 616         struct nfs4_client *clp = ls->ls_stid.sc_client;
 617         char addr_str[INET6_ADDRSTRLEN];
 618         static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
 619         static char *envp[] = {
 620                 "HOME=/",
 621                 "TERM=linux",
 622                 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 623                 NULL
 624         };
 625         char *argv[8];
 626         int error;
 627
 628         rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
 629
 630         printk(KERN_WARNING
 631                 "nfsd: client %s failed to respond to layout recall. "
 632                 "  Fencing..\n", addr_str);
 633
 634         argv[0] = (char *)nfsd_recall_failed;
 635         argv[1] = addr_str;
 636         argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
 637         argv[3] = NULL;
 638
 639         error = call_usermodehelper(nfsd_recall_failed, argv, envp,
 640                                     UMH_WAIT_PROC);
 641         if (error) {
 642                 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
 643                         addr_str, error);
 644         }
 645 }
 646
 647 static void
 648 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
 649 {
 650         struct nfs4_layout_stateid *ls =
 651                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 652
 653         mutex_lock(&ls->ls_mutex);
 654         nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
 655         mutex_unlock(&ls->ls_mutex);
 656 }
 657
 658 static int
 659 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
 660 {
 661         struct nfs4_layout_stateid *ls =
 662                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 663         struct nfsd_net *nn;
 664         ktime_t now, cutoff;
 665         const struct nfsd4_layout_ops *ops;
 666         LIST_HEAD(reaplist);
 667
 668
 669         switch (task->tk_status) {
 670         case 0:
 671         case -NFS4ERR_DELAY:
 672                 /*
 673                  * Anything left? If not, then call it done. Note that we don't
 674                  * take the spinlock since this is an optimization and nothing
 675                  * should get added until the cb counter goes to zero.
 676                  */
 677                 if (list_empty(&ls->ls_layouts))
 678                         return 1;
 679
 680                 /* Poll the client until it's done with the layout */
 681                 now = ktime_get();
 682                 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
 683
 684                 /* Client gets 2 lease periods to return it */
 685                 cutoff = ktime_add_ns(task->tk_start,
 686                                          nn->nfsd4_lease * NSEC_PER_SEC * 2);
 687
 688                 if (ktime_before(now, cutoff)) {
 689                         rpc_delay(task, HZ/100); /* 10 mili-seconds */
 690                         return 0;
 691                 }
 692                 /* Fallthrough */
 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         case -NFS4ERR_NOMATCHING_LAYOUT:
 706                 trace_layout_recall_done(&ls->ls_stid.sc_stateid);
 707                 task->tk_status = 0;
 708                 return 1;
 709         }
 710 }
 711
 712 static void
 713 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
 714 {
 715         struct nfs4_layout_stateid *ls =
 716                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 717         LIST_HEAD(reaplist);
 718
 719         trace_layout_recall_release(&ls->ls_stid.sc_stateid);
 720
 721         nfsd4_return_all_layouts(ls, &reaplist);
 722         nfsd4_free_layouts(&reaplist);
 723         nfs4_put_stid(&ls->ls_stid);
 724 }
 725
 726 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
 727         .prepare        = nfsd4_cb_layout_prepare,
 728         .done           = nfsd4_cb_layout_done,
 729         .release        = nfsd4_cb_layout_release,
 730 };
 731
 732 static bool
 733 nfsd4_layout_lm_break(struct file_lock *fl)
 734 {
 735         /*
 736          * We don't want the locks code to timeout the lease for us;
 737          * we'll remove it ourself if a layout isn't returned
 738          * in time:
 739          */
 740         fl->fl_break_time = 0;
 741         nfsd4_recall_file_layout(fl->fl_owner);
 742         return false;
 743 }
 744
 745 static int
 746 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
 747                 struct list_head *dispose)
 748 {
 749         BUG_ON(!(arg & F_UNLCK));
 750         return lease_modify(onlist, arg, dispose);
 751 }
 752
 753 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
 754         .lm_break       = nfsd4_layout_lm_break,
 755         .lm_change      = nfsd4_layout_lm_change,
 756 };
 757
 758 int
 759 nfsd4_init_pnfs(void)
 760 {
 761         int i;
 762
 763         for (i = 0; i < DEVID_HASH_SIZE; i++)
 764                 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 765
 766         nfs4_layout_cache = kmem_cache_create("nfs4_layout",
 767                         sizeof(struct nfs4_layout), 0, 0, NULL);
 768         if (!nfs4_layout_cache)
 769                 return -ENOMEM;
 770
 771         nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
 772                         sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
 773         if (!nfs4_layout_stateid_cache) {
 774                 kmem_cache_destroy(nfs4_layout_cache);
 775                 return -ENOMEM;
 776         }
 777         return 0;
 778 }
 779
 780 void
 781 nfsd4_exit_pnfs(void)
 782 {
 783         int i;
 784
 785         kmem_cache_destroy(nfs4_layout_cache);
 786         kmem_cache_destroy(nfs4_layout_stateid_cache);
 787
 788         for (i = 0; i < DEVID_HASH_SIZE; i++) {
 789                 struct nfsd4_deviceid_map *map, *n;
 790
 791                 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
 792                         kfree(map);
 793         }
 794 }