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1 /*

3 */

4 #include <linux/kmod.h>

5 #include <linux/file.h>

6 #include <linux/jhash.h>

7 #include <linux/sched.h>

8 #include <linux/sunrpc/addr.h>

10 #include "pnfs.h"

11 #include "netns.h"

12 #include "trace.h"

14 #define NFSDDBG_FACILITY NFSDDBG_PNFS

16 struct nfs4_layout {

17 struct list_head lo_perstate;

18 struct nfs4_layout_stateid *lo_state;

19 struct nfsd4_layout_seg lo_seg;

20 };

22 static struct kmem_cache *nfs4_layout_cache;

23 static struct kmem_cache *nfs4_layout_stateid_cache;

25 static struct nfsd4_callback_ops nfsd4_cb_layout_ops;

26 static const struct lock_manager_operations nfsd4_layouts_lm_ops;

28 const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {

29 [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,

30 };

32 /* pNFS device ID to export fsid mapping */

33 #define DEVID_HASH_BITS 8

34 #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS)

35 #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1)

36 static u64 nfsd_devid_seq = 1;

37 static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];

38 static DEFINE_SPINLOCK(nfsd_devid_lock);

40 static inline u32 devid_hashfn(u64 idx)

41 {

42 return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;

43 }

45 static void

46 nfsd4_alloc_devid_map(const struct svc_fh *fhp)

47 {

48 const struct knfsd_fh *fh = &fhp->fh_handle;

49 size_t fsid_len = key_len(fh->fh_fsid_type);

50 struct nfsd4_deviceid_map *map, *old;

51 int i;

53 map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL);

54 if (!map)

55 return;

57 map->fsid_type = fh->fh_fsid_type;

58 memcpy(&map->fsid, fh->fh_fsid, fsid_len);

60 spin_lock(&nfsd_devid_lock);

61 if (fhp->fh_export->ex_devid_map)

62 goto out_unlock;

64 for (i = 0; i < DEVID_HASH_SIZE; i++) {

65 list_for_each_entry(old, &nfsd_devid_hash[i], hash) {

66 if (old->fsid_type != fh->fh_fsid_type)

67 continue;

68 if (memcmp(old->fsid, fh->fh_fsid,

69 key_len(old->fsid_type)))

70 continue;

72 fhp->fh_export->ex_devid_map = old;

73 goto out_unlock;

74 }

75 }

77 map->idx = nfsd_devid_seq++;

78 list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]);

79 fhp->fh_export->ex_devid_map = map;

80 map = NULL;

82 out_unlock:

83 spin_unlock(&nfsd_devid_lock);

84 kfree(map);

85 }

87 struct nfsd4_deviceid_map *

88 nfsd4_find_devid_map(int idx)

89 {

90 struct nfsd4_deviceid_map *map, *ret = NULL;

92 rcu_read_lock();

93 list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash)

94 if (map->idx == idx)

95 ret = map;

96 rcu_read_unlock();

98 return ret;

99 }

100

101 int

102 nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,

103 u32 device_generation)

104 {

105 if (!fhp->fh_export->ex_devid_map) {

106 nfsd4_alloc_devid_map(fhp);

107 if (!fhp->fh_export->ex_devid_map)

108 return -ENOMEM;

109 }

110

111 id->fsid_idx = fhp->fh_export->ex_devid_map->idx;

112 id->generation = device_generation;

113 id->pad = 0;

114 return 0;

115 }

116

117 void nfsd4_setup_layout_type(struct svc_export *exp)

118 {

119 struct super_block *sb = exp->ex_path.mnt->mnt_sb;

120

121 if (exp->ex_flags & NFSEXP_NOPNFS)

122 return;

123

124 if (sb->s_export_op->get_uuid &&

125 sb->s_export_op->map_blocks &&

126 sb->s_export_op->commit_blocks)

127 exp->ex_layout_type = LAYOUT_BLOCK_VOLUME;

128 }

129

130 static void

131 nfsd4_free_layout_stateid(struct nfs4_stid *stid)

132 {

133 struct nfs4_layout_stateid *ls = layoutstateid(stid);

134 struct nfs4_client *clp = ls->ls_stid.sc_client;

135 struct nfs4_file *fp = ls->ls_stid.sc_file;

136

137 trace_layoutstate_free(&ls->ls_stid.sc_stateid);

138

139 spin_lock(&clp->cl_lock);

140 list_del_init(&ls->ls_perclnt);

141 spin_unlock(&clp->cl_lock);

142

143 spin_lock(&fp->fi_lock);

144 list_del_init(&ls->ls_perfile);

145 spin_unlock(&fp->fi_lock);

146

147 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);

148 fput(ls->ls_file);

149

150 if (ls->ls_recalled)

151 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);

152

153 kmem_cache_free(nfs4_layout_stateid_cache, ls);

154 }

155

156 static int

157 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)

158 {

159 struct file_lock *fl;

160 int status;

161

162 fl = locks_alloc_lock();

163 if (!fl)

164 return -ENOMEM;

165 locks_init_lock(fl);

166 fl->fl_lmops = &nfsd4_layouts_lm_ops;

167 fl->fl_flags = FL_LAYOUT;

168 fl->fl_type = F_RDLCK;

169 fl->fl_end = OFFSET_MAX;

170 fl->fl_owner = ls;

171 fl->fl_pid = current->tgid;

172 fl->fl_file = ls->ls_file;

173

174 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);

175 if (status) {

176 locks_free_lock(fl);

177 return status;

178 }

179 BUG_ON(fl != NULL);

180 return 0;

181 }

182

183 static struct nfs4_layout_stateid *

184 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,

185 struct nfs4_stid *parent, u32 layout_type)

186 {

187 struct nfs4_client *clp = cstate->clp;

188 struct nfs4_file *fp = parent->sc_file;

189 struct nfs4_layout_stateid *ls;

190 struct nfs4_stid *stp;

191

192 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache);

193 if (!stp)

194 return NULL;

195 stp->sc_free = nfsd4_free_layout_stateid;

196 get_nfs4_file(fp);

197 stp->sc_file = fp;

198

199 ls = layoutstateid(stp);

200 INIT_LIST_HEAD(&ls->ls_perclnt);

201 INIT_LIST_HEAD(&ls->ls_perfile);

202 spin_lock_init(&ls->ls_lock);

203 INIT_LIST_HEAD(&ls->ls_layouts);

204 ls->ls_layout_type = layout_type;

205 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,

206 NFSPROC4_CLNT_CB_LAYOUT);

207

208 if (parent->sc_type == NFS4_DELEG_STID)

209 ls->ls_file = get_file(fp->fi_deleg_file);

210 else

211 ls->ls_file = find_any_file(fp);

212 BUG_ON(!ls->ls_file);

213

214 if (nfsd4_layout_setlease(ls)) {

215 put_nfs4_file(fp);

216 kmem_cache_free(nfs4_layout_stateid_cache, ls);

217 return NULL;

218 }

219

220 spin_lock(&clp->cl_lock);

221 stp->sc_type = NFS4_LAYOUT_STID;

222 list_add(&ls->ls_perclnt, &clp->cl_lo_states);

223 spin_unlock(&clp->cl_lock);

224

225 spin_lock(&fp->fi_lock);

226 list_add(&ls->ls_perfile, &fp->fi_lo_states);

227 spin_unlock(&fp->fi_lock);

228

229 trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);

230 return ls;

231 }

232

233 __be32

234 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,

235 struct nfsd4_compound_state *cstate, stateid_t *stateid,

236 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)

237 {

238 struct nfs4_layout_stateid *ls;

239 struct nfs4_stid *stid;

240 unsigned char typemask = NFS4_LAYOUT_STID;

241 __be32 status;

242

243 if (create)

244 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);

245

246 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,

247 net_generic(SVC_NET(rqstp), nfsd_net_id));

248 if (status)

249 goto out;

250

251 if (!fh_match(&cstate->current_fh.fh_handle,

252 &stid->sc_file->fi_fhandle)) {

253 status = nfserr_bad_stateid;

254 goto out_put_stid;

255 }

256

257 if (stid->sc_type != NFS4_LAYOUT_STID) {

258 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);

259 nfs4_put_stid(stid);

260

261 status = nfserr_jukebox;

262 if (!ls)

263 goto out;

264 } else {

265 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);

266

267 status = nfserr_bad_stateid;

268 if (stateid->si_generation > stid->sc_stateid.si_generation)

269 goto out_put_stid;

270 if (layout_type != ls->ls_layout_type)

271 goto out_put_stid;

272 }

273

274 *lsp = ls;

275 return 0;

276

277 out_put_stid:

278 nfs4_put_stid(stid);

279 out:

280 return status;

281 }

282

283 static void

284 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)

285 {

286 spin_lock(&ls->ls_lock);

287 if (ls->ls_recalled)

288 goto out_unlock;

289

290 ls->ls_recalled = true;

291 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);

292 if (list_empty(&ls->ls_layouts))

293 goto out_unlock;

294

295 trace_layout_recall(&ls->ls_stid.sc_stateid);

296

297 atomic_inc(&ls->ls_stid.sc_count);

298 update_stateid(&ls->ls_stid.sc_stateid);

299 memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));

300 nfsd4_run_cb(&ls->ls_recall);

301

302 out_unlock:

303 spin_unlock(&ls->ls_lock);

304 }

305

306 static inline u64

307 layout_end(struct nfsd4_layout_seg *seg)

308 {

309 u64 end = seg->offset + seg->length;

310 return end >= seg->offset ? end : NFS4_MAX_UINT64;

311 }

312

313 static void

314 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)

315 {

316 if (end == NFS4_MAX_UINT64)

317 lo->length = NFS4_MAX_UINT64;

318 else

319 lo->length = end - lo->offset;

320 }

321

322 static bool

323 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)

324 {

325 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)

326 return false;

327 if (layout_end(&lo->lo_seg) <= s->offset)

328 return false;

329 if (layout_end(s) <= lo->lo_seg.offset)

330 return false;

331 return true;

332 }

333

334 static bool

335 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)

336 {

337 if (lo->iomode != new->iomode)

338 return false;

339 if (layout_end(new) < lo->offset)

340 return false;

341 if (layout_end(lo) < new->offset)

342 return false;

343

344 lo->offset = min(lo->offset, new->offset);

345 layout_update_len(lo, max(layout_end(lo), layout_end(new)));

346 return true;

347 }

348

349 static __be32

350 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)

351 {

352 struct nfs4_file *fp = ls->ls_stid.sc_file;

353 struct nfs4_layout_stateid *l, *n;

354 __be32 nfserr = nfs_ok;

355

356 assert_spin_locked(&fp->fi_lock);

357

358 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {

359 if (l != ls) {

360 nfsd4_recall_file_layout(l);

361 nfserr = nfserr_recallconflict;

362 }

363 }

364

365 return nfserr;

366 }

367

368 __be32

369 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)

370 {

371 struct nfsd4_layout_seg *seg = &lgp->lg_seg;

372 struct nfs4_file *fp = ls->ls_stid.sc_file;

373 struct nfs4_layout *lp, *new = NULL;

374 __be32 nfserr;

375

376 spin_lock(&fp->fi_lock);

377 nfserr = nfsd4_recall_conflict(ls);

378 if (nfserr)

379 goto out;

380 spin_lock(&ls->ls_lock);

381 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {

382 if (layouts_try_merge(&lp->lo_seg, seg))

383 goto done;

384 }

385 spin_unlock(&ls->ls_lock);

386 spin_unlock(&fp->fi_lock);

387

388 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);

389 if (!new)

390 return nfserr_jukebox;

391 memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));

392 new->lo_state = ls;

393

394 spin_lock(&fp->fi_lock);

395 nfserr = nfsd4_recall_conflict(ls);

396 if (nfserr)

397 goto out;

398 spin_lock(&ls->ls_lock);

399 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {

400 if (layouts_try_merge(&lp->lo_seg, seg))

401 goto done;

402 }

403

404 atomic_inc(&ls->ls_stid.sc_count);

405 list_add_tail(&new->lo_perstate, &ls->ls_layouts);

406 new = NULL;

407 done:

408 update_stateid(&ls->ls_stid.sc_stateid);

409 memcpy(&lgp->lg_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));

410 spin_unlock(&ls->ls_lock);

411 out:

412 spin_unlock(&fp->fi_lock);

413 if (new)

414 kmem_cache_free(nfs4_layout_cache, new);

415 return nfserr;

416 }

417

418 static void

419 nfsd4_free_layouts(struct list_head *reaplist)

420 {

421 while (!list_empty(reaplist)) {

422 struct nfs4_layout *lp = list_first_entry(reaplist,

423 struct nfs4_layout, lo_perstate);

424

425 list_del(&lp->lo_perstate);

426 nfs4_put_stid(&lp->lo_state->ls_stid);

427 kmem_cache_free(nfs4_layout_cache, lp);

428 }

429 }

430

431 static void

432 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,

433 struct list_head *reaplist)

434 {

435 struct nfsd4_layout_seg *lo = &lp->lo_seg;

436 u64 end = layout_end(lo);

437

438 if (seg->offset <= lo->offset) {

439 if (layout_end(seg) >= end) {

440 list_move_tail(&lp->lo_perstate, reaplist);

441 return;

442 }

443 end = seg->offset;

444 } else {

445 /* retain the whole layout segment on a split. */

446 if (layout_end(seg) < end) {

447 dprintk("%s: split not supported\n", __func__);

448 return;

449 }

450

451 lo->offset = layout_end(seg);

452 }

453

454 layout_update_len(lo, end);

455 }

456

457 __be32

458 nfsd4_return_file_layouts(struct svc_rqst *rqstp,

459 struct nfsd4_compound_state *cstate,

460 struct nfsd4_layoutreturn *lrp)

461 {

462 struct nfs4_layout_stateid *ls;

463 struct nfs4_layout *lp, *n;

464 LIST_HEAD(reaplist);

465 __be32 nfserr;

466 int found = 0;

467

468 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,

469 false, lrp->lr_layout_type,

470 &ls);

471 if (nfserr) {

472 trace_layout_return_lookup_fail(&lrp->lr_sid);

473 return nfserr;

474 }

475

476 spin_lock(&ls->ls_lock);

477 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {

478 if (layouts_overlapping(lp, &lrp->lr_seg)) {

479 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);

480 found++;

481 }

482 }

483 if (!list_empty(&ls->ls_layouts)) {

484 if (found) {

485 update_stateid(&ls->ls_stid.sc_stateid);

486 memcpy(&lrp->lr_sid, &ls->ls_stid.sc_stateid,

487 sizeof(stateid_t));

488 }

489 lrp->lrs_present = 1;

490 } else {

491 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);

492 nfs4_unhash_stid(&ls->ls_stid);

493 lrp->lrs_present = 0;

494 }

495 spin_unlock(&ls->ls_lock);

496

497 nfs4_put_stid(&ls->ls_stid);

498 nfsd4_free_layouts(&reaplist);

499 return nfs_ok;

500 }

501

502 __be32

503 nfsd4_return_client_layouts(struct svc_rqst *rqstp,

504 struct nfsd4_compound_state *cstate,

505 struct nfsd4_layoutreturn *lrp)

506 {

507 struct nfs4_layout_stateid *ls, *n;

508 struct nfs4_client *clp = cstate->clp;

509 struct nfs4_layout *lp, *t;

510 LIST_HEAD(reaplist);

511

512 lrp->lrs_present = 0;

513

514 spin_lock(&clp->cl_lock);

515 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {

516 if (lrp->lr_return_type == RETURN_FSID &&

517 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,

518 &cstate->current_fh.fh_handle))

519 continue;

520

521 spin_lock(&ls->ls_lock);

522 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {

523 if (lrp->lr_seg.iomode == IOMODE_ANY ||

524 lrp->lr_seg.iomode == lp->lo_seg.iomode)

525 list_move_tail(&lp->lo_perstate, &reaplist);

526 }

527 spin_unlock(&ls->ls_lock);

528 }

529 spin_unlock(&clp->cl_lock);

530

531 nfsd4_free_layouts(&reaplist);

532 return 0;

533 }

534

535 static void

536 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,

537 struct list_head *reaplist)

538 {

539 spin_lock(&ls->ls_lock);

540 list_splice_init(&ls->ls_layouts, reaplist);

541 spin_unlock(&ls->ls_lock);

542 }

543

544 void

545 nfsd4_return_all_client_layouts(struct nfs4_client *clp)

546 {

547 struct nfs4_layout_stateid *ls, *n;

548 LIST_HEAD(reaplist);

549

550 spin_lock(&clp->cl_lock);

551 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)

552 nfsd4_return_all_layouts(ls, &reaplist);

553 spin_unlock(&clp->cl_lock);

554

555 nfsd4_free_layouts(&reaplist);

556 }

557

558 void

559 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)

560 {

561 struct nfs4_layout_stateid *ls, *n;

562 LIST_HEAD(reaplist);

563

564 spin_lock(&fp->fi_lock);

565 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {

566 if (ls->ls_stid.sc_client == clp)

567 nfsd4_return_all_layouts(ls, &reaplist);

568 }

569 spin_unlock(&fp->fi_lock);

570

571 nfsd4_free_layouts(&reaplist);

572 }

573

574 static void

575 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)

576 {

577 struct nfs4_client *clp = ls->ls_stid.sc_client;

578 char addr_str[INET6_ADDRSTRLEN];

579 static char *envp[] = {

580 "HOME=/",

581 "TERM=linux",

582 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",

583 NULL

584 };

585 char *argv[8];

586 int error;

587

588 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));

589

590 printk(KERN_WARNING

591 "nfsd: client %s failed to respond to layout recall. "

592 " Fencing..\n", addr_str);

593

594 argv[0] = "/sbin/nfsd-recall-failed";

595 argv[1] = addr_str;

596 argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;

597 argv[3] = NULL;

598

599 error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);

600 if (error) {

601 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",

602 addr_str, error);

603 }

604 }

605

606 static int

607 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)

608 {

609 struct nfs4_layout_stateid *ls =

610 container_of(cb, struct nfs4_layout_stateid, ls_recall);

611 LIST_HEAD(reaplist);

612

613 switch (task->tk_status) {

614 case 0:

615 return 1;

616 case -NFS4ERR_NOMATCHING_LAYOUT:

617 trace_layout_recall_done(&ls->ls_stid.sc_stateid);

618 task->tk_status = 0;

619 return 1;

620 case -NFS4ERR_DELAY:

621 /* Poll the client until it's done with the layout */

622 /* FIXME: cap number of retries.

623 * The pnfs standard states that we need to only expire

624 * the client after at-least "lease time" .eg lease-time * 2

625 * when failing to communicate a recall

626 */

627 rpc_delay(task, HZ/100); /* 10 mili-seconds */

628 return 0;

629 default:

630 /*

631 * Unknown error or non-responding client, we'll need to fence.

632 */

633 nfsd4_cb_layout_fail(ls);

634 return -1;

635 }

636 }

637

638 static void

639 nfsd4_cb_layout_release(struct nfsd4_callback *cb)

640 {

641 struct nfs4_layout_stateid *ls =

642 container_of(cb, struct nfs4_layout_stateid, ls_recall);

643 LIST_HEAD(reaplist);

644

645 trace_layout_recall_release(&ls->ls_stid.sc_stateid);

646

647 nfsd4_return_all_layouts(ls, &reaplist);

648 nfsd4_free_layouts(&reaplist);

649 nfs4_put_stid(&ls->ls_stid);

650 }

651

652 static struct nfsd4_callback_ops nfsd4_cb_layout_ops = {

653 .done = nfsd4_cb_layout_done,

654 .release = nfsd4_cb_layout_release,

655 };

656

657 static bool

658 nfsd4_layout_lm_break(struct file_lock *fl)

659 {

660 /*

661 * We don't want the locks code to timeout the lease for us;

662 * we'll remove it ourself if a layout isn't returned

663 * in time:

664 */

665 fl->fl_break_time = 0;

666 nfsd4_recall_file_layout(fl->fl_owner);

667 return false;

668 }

669

670 static int

671 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,

672 struct list_head *dispose)

673 {

674 BUG_ON(!(arg & F_UNLCK));

675 return lease_modify(onlist, arg, dispose);

676 }

677

678 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {

679 .lm_break = nfsd4_layout_lm_break,

680 .lm_change = nfsd4_layout_lm_change,

681 };

682

683 int

684 nfsd4_init_pnfs(void)

685 {

686 int i;

687

688 for (i = 0; i < DEVID_HASH_SIZE; i++)

689 INIT_LIST_HEAD(&nfsd_devid_hash[i]);

690

691 nfs4_layout_cache = kmem_cache_create("nfs4_layout",

692 sizeof(struct nfs4_layout), 0, 0, NULL);

693 if (!nfs4_layout_cache)

694 return -ENOMEM;

695

696 nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",

697 sizeof(struct nfs4_layout_stateid), 0, 0, NULL);

698 if (!nfs4_layout_stateid_cache) {

699 kmem_cache_destroy(nfs4_layout_cache);

700 return -ENOMEM;

701 }

702 return 0;

703 }

704

705 void

706 nfsd4_exit_pnfs(void)

707 {

708 int i;

709

710 kmem_cache_destroy(nfs4_layout_cache);

711 kmem_cache_destroy(nfs4_layout_stateid_cache);

712

713 for (i = 0; i < DEVID_HASH_SIZE; i++) {

714 struct nfsd4_deviceid_map *map, *n;

715

716 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)

717 kfree(map);

718 }

719 }