linux/fs/nfsd/nfs4layouts.c
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   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
  18struct nfs4_layout {
  19        struct list_head                lo_perstate;
  20        struct nfs4_layout_stateid      *lo_state;
  21        struct nfsd4_layout_seg         lo_seg;
  22};
  23
  24static struct kmem_cache *nfs4_layout_cache;
  25static struct kmem_cache *nfs4_layout_stateid_cache;
  26
  27static const struct nfsd4_callback_ops nfsd4_cb_layout_ops;
  28static const struct lock_manager_operations nfsd4_layouts_lm_ops;
  29
  30const 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)
  46static u64 nfsd_devid_seq = 1;
  47static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];
  48static DEFINE_SPINLOCK(nfsd_devid_lock);
  49
  50static inline u32 devid_hashfn(u64 idx)
  51{
  52        return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;
  53}
  54
  55static void
  56nfsd4_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
  92out_unlock:
  93        spin_unlock(&nfsd_devid_lock);
  94        kfree(map);
  95}
  96
  97struct nfsd4_deviceid_map *
  98nfsd4_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
 111int
 112nfsd4_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
 127void 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
 154static void
 155nfsd4_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
 181static int
 182nfsd4_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
 211static struct nfs4_layout_stateid *
 212nfsd4_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
 265nfsd4_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
 310out_unlock_stid:
 311        mutex_unlock(&ls->ls_mutex);
 312out_put_stid:
 313        nfs4_put_stid(stid);
 314out:
 315        return status;
 316}
 317
 318static void
 319nfsd4_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
 335out_unlock:
 336        spin_unlock(&ls->ls_lock);
 337}
 338
 339static inline u64
 340layout_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
 346static void
 347layout_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
 355static bool
 356layouts_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
 367static bool
 368layouts_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
 382static __be32
 383nfsd4_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
 402nfsd4_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;
 440done:
 441        nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
 442        spin_unlock(&ls->ls_lock);
 443out:
 444        spin_unlock(&fp->fi_lock);
 445        if (new)
 446                kmem_cache_free(nfs4_layout_cache, new);
 447        return nfserr;
 448}
 449
 450static void
 451nfsd4_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
 463static void
 464nfsd4_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
 489nfsd4_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
 532nfsd4_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
 567static void
 568nfsd4_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
 576void
 577nfsd4_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
 590void
 591nfsd4_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
 606static void
 607nfsd4_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
 640static void
 641nfsd4_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
 651static int
 652nfsd4_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
 660
 661        switch (task->tk_status) {
 662        case 0:
 663        case -NFS4ERR_DELAY:
 664                /*
 665                 * Anything left? If not, then call it done. Note that we don't
 666                 * take the spinlock since this is an optimization and nothing
 667                 * should get added until the cb counter goes to zero.
 668                 */
 669                if (list_empty(&ls->ls_layouts))
 670                        return 1;
 671
 672                /* Poll the client until it's done with the layout */
 673                now = ktime_get();
 674                nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
 675
 676                /* Client gets 2 lease periods to return it */
 677                cutoff = ktime_add_ns(task->tk_start,
 678                                         (u64)nn->nfsd4_lease * NSEC_PER_SEC * 2);
 679
 680                if (ktime_before(now, cutoff)) {
 681                        rpc_delay(task, HZ/100); /* 10 mili-seconds */
 682                        return 0;
 683                }
 684                /* Fallthrough */
 685        default:
 686                /*
 687                 * Unknown error or non-responding client, we'll need to fence.
 688                 */
 689                trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
 690
 691                ops = nfsd4_layout_ops[ls->ls_layout_type];
 692                if (ops->fence_client)
 693                        ops->fence_client(ls);
 694                else
 695                        nfsd4_cb_layout_fail(ls);
 696                return 1;
 697        case -NFS4ERR_NOMATCHING_LAYOUT:
 698                trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
 699                task->tk_status = 0;
 700                return 1;
 701        }
 702}
 703
 704static void
 705nfsd4_cb_layout_release(struct nfsd4_callback *cb)
 706{
 707        struct nfs4_layout_stateid *ls =
 708                container_of(cb, struct nfs4_layout_stateid, ls_recall);
 709        LIST_HEAD(reaplist);
 710
 711        trace_nfsd_layout_recall_release(&ls->ls_stid.sc_stateid);
 712
 713        nfsd4_return_all_layouts(ls, &reaplist);
 714        nfsd4_free_layouts(&reaplist);
 715        nfs4_put_stid(&ls->ls_stid);
 716}
 717
 718static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
 719        .prepare        = nfsd4_cb_layout_prepare,
 720        .done           = nfsd4_cb_layout_done,
 721        .release        = nfsd4_cb_layout_release,
 722};
 723
 724static bool
 725nfsd4_layout_lm_break(struct file_lock *fl)
 726{
 727        /*
 728         * We don't want the locks code to timeout the lease for us;
 729         * we'll remove it ourself if a layout isn't returned
 730         * in time:
 731         */
 732        fl->fl_break_time = 0;
 733        nfsd4_recall_file_layout(fl->fl_owner);
 734        return false;
 735}
 736
 737static int
 738nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
 739                struct list_head *dispose)
 740{
 741        BUG_ON(!(arg & F_UNLCK));
 742        return lease_modify(onlist, arg, dispose);
 743}
 744
 745static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
 746        .lm_break       = nfsd4_layout_lm_break,
 747        .lm_change      = nfsd4_layout_lm_change,
 748};
 749
 750int
 751nfsd4_init_pnfs(void)
 752{
 753        int i;
 754
 755        for (i = 0; i < DEVID_HASH_SIZE; i++)
 756                INIT_LIST_HEAD(&nfsd_devid_hash[i]);
 757
 758        nfs4_layout_cache = kmem_cache_create("nfs4_layout",
 759                        sizeof(struct nfs4_layout), 0, 0, NULL);
 760        if (!nfs4_layout_cache)
 761                return -ENOMEM;
 762
 763        nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
 764                        sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
 765        if (!nfs4_layout_stateid_cache) {
 766                kmem_cache_destroy(nfs4_layout_cache);
 767                return -ENOMEM;
 768        }
 769        return 0;
 770}
 771
 772void
 773nfsd4_exit_pnfs(void)
 774{
 775        int i;
 776
 777        kmem_cache_destroy(nfs4_layout_cache);
 778        kmem_cache_destroy(nfs4_layout_stateid_cache);
 779
 780        for (i = 0; i < DEVID_HASH_SIZE; i++) {
 781                struct nfsd4_deviceid_map *map, *n;
 782
 783                list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
 784                        kfree(map);
 785        }
 786}
 787