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 #ifdef CONFIG_NFSD_FLEXFILELAYOUT
 137         exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
 138 #endif
 139 #ifdef CONFIG_NFSD_BLOCKLAYOUT
 140         if (sb->s_export_op->get_uuid &&
 141             sb->s_export_op->map_blocks &&
 142             sb->s_export_op->commit_blocks)
 143                 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME;
 144 #endif
 145 #ifdef CONFIG_NFSD_SCSILAYOUT
 146         if (sb->s_export_op->map_blocks &&
 147             sb->s_export_op->commit_blocks &&
 148             sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops &&
 149                 blk_queue_scsi_passthrough(sb->s_bdev->bd_disk->queue))
 150                 exp->ex_layout_types |= 1 << LAYOUT_SCSI;
 151 #endif
 152 }
 153
 154 static void
 155 nfsd4_free_layout_stateid(struct nfs4_stid *stid)
 156 {
 157         struct nfs4_layout_stateid *ls = layoutstateid(stid);
 158         struct nfs4_client *clp = ls->ls_stid.sc_client;
 159         struct nfs4_file *fp = ls->ls_stid.sc_file;
 160
 161         trace_nfsd_layoutstate_free(&ls->ls_stid.sc_stateid);
 162
 163         spin_lock(&clp->cl_lock);
 164         list_del_init(&ls->ls_perclnt);
 165         spin_unlock(&clp->cl_lock);
 166
 167         spin_lock(&fp->fi_lock);
 168         list_del_init(&ls->ls_perfile);
 169         spin_unlock(&fp->fi_lock);
 170
 171         if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 172                 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
 173         fput(ls->ls_file);
 174
 175         if (ls->ls_recalled)
 176                 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
 177
 178         kmem_cache_free(nfs4_layout_stateid_cache, ls);
 179 }
 180
 181 static int
 182 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
 183 {
 184         struct file_lock *fl;
 185         int status;
 186
 187         if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
 188                 return 0;
 189
 190         fl = locks_alloc_lock();
 191         if (!fl)
 192                 return -ENOMEM;
 193         locks_init_lock(fl);
 194         fl->fl_lmops = &nfsd4_layouts_lm_ops;
 195         fl->fl_flags = FL_LAYOUT;
 196         fl->fl_type = F_RDLCK;
 197         fl->fl_end = OFFSET_MAX;
 198         fl->fl_owner = ls;
 199         fl->fl_pid = current->tgid;
 200         fl->fl_file = ls->ls_file;
 201
 202         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
 203         if (status) {
 204                 locks_free_lock(fl);
 205                 return status;
 206         }
 207         BUG_ON(fl != NULL);
 208         return 0;
 209 }
 210
 211 static struct nfs4_layout_stateid *
 212 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
 213                 struct nfs4_stid *parent, u32 layout_type)
 214 {
 215         struct nfs4_client *clp = cstate->clp;
 216         struct nfs4_file *fp = parent->sc_file;
 217         struct nfs4_layout_stateid *ls;
 218         struct nfs4_stid *stp;
 219
 220         stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache,
 221                                         nfsd4_free_layout_stateid);
 222         if (!stp)
 223                 return NULL;
 224
 225         get_nfs4_file(fp);
 226         stp->sc_file = fp;
 227
 228         ls = layoutstateid(stp);
 229         INIT_LIST_HEAD(&ls->ls_perclnt);
 230         INIT_LIST_HEAD(&ls->ls_perfile);
 231         spin_lock_init(&ls->ls_lock);
 232         INIT_LIST_HEAD(&ls->ls_layouts);
 233         mutex_init(&ls->ls_mutex);
 234         ls->ls_layout_type = layout_type;
 235         nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
 236                         NFSPROC4_CLNT_CB_LAYOUT);
 237
 238         if (parent->sc_type == NFS4_DELEG_STID)
 239                 ls->ls_file = get_file(fp->fi_deleg_file);
 240         else
 241                 ls->ls_file = find_any_file(fp);
 242         BUG_ON(!ls->ls_file);
 243
 244         if (nfsd4_layout_setlease(ls)) {
 245                 fput(ls->ls_file);
 246                 put_nfs4_file(fp);
 247                 kmem_cache_free(nfs4_layout_stateid_cache, ls);
 248                 return NULL;
 249         }
 250
 251         spin_lock(&clp->cl_lock);
 252         stp->sc_type = NFS4_LAYOUT_STID;
 253         list_add(&ls->ls_perclnt, &clp->cl_lo_states);
 254         spin_unlock(&clp->cl_lock);
 255
 256         spin_lock(&fp->fi_lock);
 257         list_add(&ls->ls_perfile, &fp->fi_lo_states);
 258         spin_unlock(&fp->fi_lock);
 259
 260         trace_nfsd_layoutstate_alloc(&ls->ls_stid.sc_stateid);
 261         return ls;
 262 }
 263
 264 __be32
 265 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
 266                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
 267                 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
 268 {
 269         struct nfs4_layout_stateid *ls;
 270         struct nfs4_stid *stid;
 271         unsigned char typemask = NFS4_LAYOUT_STID;
 272         __be32 status;
 273
 274         if (create)
 275                 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
 276
 277         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
 278                         net_generic(SVC_NET(rqstp), nfsd_net_id));
 279         if (status)
 280                 goto out;
 281
 282         if (!fh_match(&cstate->current_fh.fh_handle,
 283                       &stid->sc_file->fi_fhandle)) {
 284                 status = nfserr_bad_stateid;
 285                 goto out_put_stid;
 286         }
 287
 288         if (stid->sc_type != NFS4_LAYOUT_STID) {
 289                 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
 290                 nfs4_put_stid(stid);
 291
 292                 status = nfserr_jukebox;
 293                 if (!ls)
 294                         goto out;
 295                 mutex_lock(&ls->ls_mutex);
 296         } else {
 297                 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
 298
 299                 status = nfserr_bad_stateid;
 300                 mutex_lock(&ls->ls_mutex);
 301                 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
 302                         goto out_unlock_stid;
 303                 if (layout_type != ls->ls_layout_type)
 304                         goto out_unlock_stid;
 305         }
 306
 307         *lsp = ls;
 308         return 0;
 309
 310 out_unlock_stid:
 311         mutex_unlock(&ls->ls_mutex);
 312 out_put_stid:
 313         nfs4_put_stid(stid);
 314 out:
 315         return status;
 316 }
 317
 318 static void
 319 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
 320 {
 321         spin_lock(&ls->ls_lock);
 322         if (ls->ls_recalled)
 323                 goto out_unlock;
 324
 325         ls->ls_recalled = true;
 326         atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
 327         if (list_empty(&ls->ls_layouts))
 328                 goto out_unlock;
 329
 330         trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid);
 331
 332         refcount_inc(&ls->ls_stid.sc_count);
 333         nfsd4_run_cb(&ls->ls_recall);
 334
 335 out_unlock:
 336         spin_unlock(&ls->ls_lock);
 337 }
 338
 339 static inline u64
 340 layout_end(struct nfsd4_layout_seg *seg)
 341 {
 342         u64 end = seg->offset + seg->length;
 343         return end >= seg->offset ? end : NFS4_MAX_UINT64;
 344 }
 345
 346 static void
 347 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
 348 {
 349         if (end == NFS4_MAX_UINT64)
 350                 lo->length = NFS4_MAX_UINT64;
 351         else
 352                 lo->length = end - lo->offset;
 353 }
 354
 355 static bool
 356 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
 357 {
 358         if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
 359                 return false;
 360         if (layout_end(&lo->lo_seg) <= s->offset)
 361                 return false;
 362         if (layout_end(s) <= lo->lo_seg.offset)
 363                 return false;
 364         return true;
 365 }
 366
 367 static bool
 368 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
 369 {
 370         if (lo->iomode != new->iomode)
 371                 return false;
 372         if (layout_end(new) < lo->offset)
 373                 return false;
 374         if (layout_end(lo) < new->offset)
 375                 return false;
 376
 377         lo->offset = min(lo->offset, new->offset);
 378         layout_update_len(lo, max(layout_end(lo), layout_end(new)));
 379         return true;
 380 }
 381
 382 static __be32
 383 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
 384 {
 385         struct nfs4_file *fp = ls->ls_stid.sc_file;
 386         struct nfs4_layout_stateid *l, *n;
 387         __be32 nfserr = nfs_ok;
 388
 389         assert_spin_locked(&fp->fi_lock);
 390
 391         list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
 392                 if (l != ls) {
 393                         nfsd4_recall_file_layout(l);
 394                         nfserr = nfserr_recallconflict;
 395                 }
 396         }
 397
 398         return nfserr;
 399 }
 400
 401 __be32
 402 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
 403 {
 404         struct nfsd4_layout_seg *seg = &lgp->lg_seg;
 405         struct nfs4_file *fp = ls->ls_stid.sc_file;
 406         struct nfs4_layout *lp, *new = NULL;
 407         __be32 nfserr;
 408
 409         spin_lock(&fp->fi_lock);
 410         nfserr = nfsd4_recall_conflict(ls);
 411         if (nfserr)
 412                 goto out;
 413         spin_lock(&ls->ls_lock);
 414         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 415                 if (layouts_try_merge(&lp->lo_seg, seg))
 416                         goto done;
 417         }
 418         spin_unlock(&ls->ls_lock);
 419         spin_unlock(&fp->fi_lock);
 420
 421         new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
 422         if (!new)
 423                 return nfserr_jukebox;
 424         memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
 425         new->lo_state = ls;
 426
 427         spin_lock(&fp->fi_lock);
 428         nfserr = nfsd4_recall_conflict(ls);
 429         if (nfserr)
 430                 goto out;
 431         spin_lock(&ls->ls_lock);
 432         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
 433                 if (layouts_try_merge(&lp->lo_seg, seg))
 434                         goto done;
 435         }
 436
 437         refcount_inc(&ls->ls_stid.sc_count);
 438         list_add_tail(&new->lo_perstate, &ls->ls_layouts);
 439         new = NULL;
 440 done:
 441         nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
 442         spin_unlock(&ls->ls_lock);
 443 out:
 444         spin_unlock(&fp->fi_lock);
 445         if (new)
 446                 kmem_cache_free(nfs4_layout_cache, new);
 447         return nfserr;
 448 }
 449
 450 static void
 451 nfsd4_free_layouts(struct list_head *reaplist)
 452 {
 453         while (!list_empty(reaplist)) {
 454                 struct nfs4_layout *lp = list_first_entry(reaplist,
 455                                 struct nfs4_layout, lo_perstate);
 456
 457                 list_del(&lp->lo_perstate);
 458                 nfs4_put_stid(&lp->lo_state->ls_stid);
 459                 kmem_cache_free(nfs4_layout_cache, lp);
 460         }
 461 }
 462
 463 static void
 464 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
 465                 struct list_head *reaplist)
 466 {
 467         struct nfsd4_layout_seg *lo = &lp->lo_seg;
 468         u64 end = layout_end(lo);
 469
 470         if (seg->offset <= lo->offset) {
 471                 if (layout_end(seg) >= end) {
 472                         list_move_tail(&lp->lo_perstate, reaplist);
 473                         return;
 474                 }
 475                 lo->offset = layout_end(seg);
 476         } else {
 477                 /* retain the whole layout segment on a split. */
 478                 if (layout_end(seg) < end) {
 479                         dprintk("%s: split not supported\n", __func__);
 480                         return;
 481                 }
 482                 end = seg->offset;
 483         }
 484
 485         layout_update_len(lo, end);
 486 }
 487
 488 __be32
 489 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
 490                 struct nfsd4_compound_state *cstate,
 491                 struct nfsd4_layoutreturn *lrp)
 492 {
 493         struct nfs4_layout_stateid *ls;
 494         struct nfs4_layout *lp, *n;
 495         LIST_HEAD(reaplist);
 496         __be32 nfserr;
 497         int found = 0;
 498
 499         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
 500                                                 false, lrp->lr_layout_type,
 501                                                 &ls);
 502         if (nfserr) {
 503                 trace_nfsd_layout_return_lookup_fail(&lrp->lr_sid);
 504                 return nfserr;
 505         }
 506
 507         spin_lock(&ls->ls_lock);
 508         list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
 509                 if (layouts_overlapping(lp, &lrp->lr_seg)) {
 510                         nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
 511                         found++;
 512                 }
 513         }
 514         if (!list_empty(&ls->ls_layouts)) {
 515                 if (found)
 516                         nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
 517                 lrp->lrs_present = 1;
 518         } else {
 519                 trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid);
 520                 nfs4_unhash_stid(&ls->ls_stid);
 521                 lrp->lrs_present = 0;
 522         }
 523         spin_unlock(&ls->ls_lock);
 524
 525         mutex_unlock(&ls->ls_mutex);
 526         nfs4_put_stid(&ls->ls_stid);
 527         nfsd4_free_layouts(&reaplist);
 528         return nfs_ok;
 529 }
 530
 531 __be32
 532 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
 533                 struct nfsd4_compound_state *cstate,
 534                 struct nfsd4_layoutreturn *lrp)
 535 {
 536         struct nfs4_layout_stateid *ls, *n;
 537         struct nfs4_client *clp = cstate->clp;
 538         struct nfs4_layout *lp, *t;
 539         LIST_HEAD(reaplist);
 540
 541         lrp->lrs_present = 0;
 542
 543         spin_lock(&clp->cl_lock);
 544         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
 545                 if (ls->ls_layout_type != lrp->lr_layout_type)
 546                         continue;
 547
 548                 if (lrp->lr_return_type == RETURN_FSID &&
 549                     !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
 550                                    &cstate->current_fh.fh_handle))
 551                         continue;
 552
 553                 spin_lock(&ls->ls_lock);
 554                 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
 555                         if (lrp->lr_seg.iomode == IOMODE_ANY ||
 556                             lrp->lr_seg.iomode == lp->lo_seg.iomode)
 557                                 list_move_tail(&lp->lo_perstate, &reaplist);
 558                 }
 559                 spin_unlock(&ls->ls_lock);
 560         }
 561         spin_unlock(&clp->cl_lock);
 562
 563         nfsd4_free_layouts(&reaplist);
 564         return 0;
 565 }
 566
 567 static void
 568 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
 569                 struct list_head *reaplist)
 570 {
 571         spin_lock(&ls->ls_lock);
 572         list_splice_init(&ls->ls_layouts, reaplist);
 573         spin_unlock(&ls->ls_lock);
 574 }
 575
 576 void
 577 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
 578 {
 579         struct nfs4_layout_stateid *ls, *n;
 580         LIST_HEAD(reaplist);
 581
 582         spin_lock(&clp->cl_lock);
 583         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
 584                 nfsd4_return_all_layouts(ls, &reaplist);
 585         spin_unlock(&clp->cl_lock);
 586
 587         nfsd4_free_layouts(&reaplist);
 588 }
 589
 590 void
 591 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
 592 {
 593         struct nfs4_layout_stateid *ls, *n;
 594         LIST_HEAD(reaplist);
 595
 596         spin_lock(&fp->fi_lock);
 597         list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
 598                 if (ls->ls_stid.sc_client == clp)
 599                         nfsd4_return_all_layouts(ls, &reaplist);
 600         }
 601         spin_unlock(&fp->fi_lock);
 602
 603         nfsd4_free_layouts(&reaplist);
 604 }
 605
 606 static void
 607 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
 608 {
 609         struct nfs4_client *clp = ls->ls_stid.sc_client;
 610         char addr_str[INET6_ADDRSTRLEN];
 611         static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
 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] = (char *)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(nfsd_recall_failed, argv, envp,
 633                                     UMH_WAIT_PROC);
 634         if (error) {
 635                 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
 636                         addr_str, error);
 637         }
 638 }
 639
 640 static void
 641 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
 642 {
 643         struct nfs4_layout_stateid *ls =
 644                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 645
 646         mutex_lock(&ls->ls_mutex);
 647         nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
 648         mutex_unlock(&ls->ls_mutex);
 649 }
 650
 651 static int
 652 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
 653 {
 654         struct nfs4_layout_stateid *ls =
 655                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 656         struct nfsd_net *nn;
 657         ktime_t now, cutoff;
 658         const struct nfsd4_layout_ops *ops;
 659         LIST_HEAD(reaplist);
 660
 661
 662         switch (task->tk_status) {
 663         case 0:
 664         case -NFS4ERR_DELAY:
 665                 /*
 666                  * Anything left? If not, then call it done. Note that we don't
 667                  * take the spinlock since this is an optimization and nothing
 668                  * should get added until the cb counter goes to zero.
 669                  */
 670                 if (list_empty(&ls->ls_layouts))
 671                         return 1;
 672
 673                 /* Poll the client until it's done with the layout */
 674                 now = ktime_get();
 675                 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
 676
 677                 /* Client gets 2 lease periods to return it */
 678                 cutoff = ktime_add_ns(task->tk_start,
 679                                          (u64)nn->nfsd4_lease * NSEC_PER_SEC * 2);
 680
 681                 if (ktime_before(now, cutoff)) {
 682                         rpc_delay(task, HZ/100); /* 10 mili-seconds */
 683                         return 0;
 684                 }
 685                 /* Fallthrough */
 686         default:
 687                 /*
 688                  * Unknown error or non-responding client, we'll need to fence.
 689                  */
 690                 trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
 691
 692                 ops = nfsd4_layout_ops[ls->ls_layout_type];
 693                 if (ops->fence_client)
 694                         ops->fence_client(ls);
 695                 else
 696                         nfsd4_cb_layout_fail(ls);
 697                 return -1;
 698         case -NFS4ERR_NOMATCHING_LAYOUT:
 699                 trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
 700                 task->tk_status = 0;
 701                 return 1;
 702         }
 703 }
 704
 705 static void
 706 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
 707 {
 708         struct nfs4_layout_stateid *ls =
 709                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
 710         LIST_HEAD(reaplist);
 711
 712         trace_nfsd_layout_recall_release(&ls->ls_stid.sc_stateid);
 713
 714         nfsd4_return_all_layouts(ls, &reaplist);
 715         nfsd4_free_layouts(&reaplist);
 716         nfs4_put_stid(&ls->ls_stid);
 717 }
 718
 719 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
 720         .prepare        = nfsd4_cb_layout_prepare,
 721         .done           = nfsd4_cb_layout_done,
 722         .release        = nfsd4_cb_layout_release,
 723 };
 724
 725 static bool
 726 nfsd4_layout_lm_break(struct file_lock *fl)
 727 {
 728         /*
 729          * We don't want the locks code to timeout the lease for us;
 730          * we'll remove it ourself if a layout isn't returned
 731          * in time:
 732          */
 733         fl->fl_break_time = 0;
 734         nfsd4_recall_file_layout(fl->fl_owner);
 735         return false;
 736 }
 737
 738 static int
 739 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
 740                 struct list_head *dispose)
 741 {
 742         BUG_ON(!(arg & F_UNLCK));
 743         return lease_modify(onlist, arg, dispose);
 744 }
 745
 746 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
 747         .lm_break       = nfsd4_layout_lm_break,
 748         .lm_change      = nfsd4_layout_lm_change,
 749 };
 750
 751 int
 752 nfsd4_init_pnfs(void)
 753 {
 754         int i;
 755
 756         for (i = 0; i < DEVID_HASH_SIZE; i++)
 757                 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 758
 759         nfs4_layout_cache = kmem_cache_create("nfs4_layout",
 760                         sizeof(struct nfs4_layout), 0, 0, NULL);
 761         if (!nfs4_layout_cache)
 762                 return -ENOMEM;
 763
 764         nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
 765                         sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
 766         if (!nfs4_layout_stateid_cache) {
 767                 kmem_cache_destroy(nfs4_layout_cache);
 768                 return -ENOMEM;
 769         }
 770         return 0;
 771 }
 772
 773 void
 774 nfsd4_exit_pnfs(void)
 775 {
 776         int i;
 777
 778         kmem_cache_destroy(nfs4_layout_cache);
 779         kmem_cache_destroy(nfs4_layout_stateid_cache);
 780
 781         for (i = 0; i < DEVID_HASH_SIZE; i++) {
 782                 struct nfsd4_deviceid_map *map, *n;
 783
 784                 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
 785                         kfree(map);
 786         }
 787 }