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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/callback_proc.c
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback procedures
8 */
9#include <linux/nfs4.h>
10#include <linux/nfs_fs.h>
11#include <linux/slab.h>
12#include <linux/rcupdate.h>
13#include "nfs4_fs.h"
14#include "callback.h"
15#include "delegation.h"
16#include "internal.h"
17#include "pnfs.h"
18#include "nfs4session.h"
19#include "nfs4trace.h"
20
21#define NFSDBG_FACILITY NFSDBG_CALLBACK
22
23__be32 nfs4_callback_getattr(void *argp, void *resp,
24 struct cb_process_state *cps)
25{
26 struct cb_getattrargs *args = argp;
27 struct cb_getattrres *res = resp;
28 struct nfs_delegation *delegation;
29 struct nfs_inode *nfsi;
30 struct inode *inode;
31
32 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
33 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
34 goto out;
35
36 res->bitmap[0] = res->bitmap[1] = 0;
37 res->status = htonl(NFS4ERR_BADHANDLE);
38
39 dprintk_rcu("NFS: GETATTR callback request from %s\n",
40 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
41
42 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
43 if (inode == NULL) {
44 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
45 -ntohl(res->status));
46 goto out;
47 }
48 nfsi = NFS_I(inode);
49 rcu_read_lock();
50 delegation = rcu_dereference(nfsi->delegation);
51 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
52 goto out_iput;
53 res->size = i_size_read(inode);
54 res->change_attr = delegation->change_attr;
55 if (nfs_have_writebacks(inode))
56 res->change_attr++;
57 res->ctime = inode->i_ctime;
58 res->mtime = inode->i_mtime;
59 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
60 args->bitmap[0];
61 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
62 args->bitmap[1];
63 res->status = 0;
64out_iput:
65 rcu_read_unlock();
66 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
67 iput(inode);
68out:
69 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
70 return res->status;
71}
72
73__be32 nfs4_callback_recall(void *argp, void *resp,
74 struct cb_process_state *cps)
75{
76 struct cb_recallargs *args = argp;
77 struct inode *inode;
78 __be32 res;
79
80 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
81 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
82 goto out;
83
84 dprintk_rcu("NFS: RECALL callback request from %s\n",
85 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
86
87 res = htonl(NFS4ERR_BADHANDLE);
88 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
89 if (inode == NULL) {
90 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
91 &args->stateid, -ntohl(res));
92 goto out;
93 }
94 /* Set up a helper thread to actually return the delegation */
95 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
96 case 0:
97 res = 0;
98 break;
99 case -ENOENT:
100 res = htonl(NFS4ERR_BAD_STATEID);
101 break;
102 default:
103 res = htonl(NFS4ERR_RESOURCE);
104 }
105 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
106 &args->stateid, -ntohl(res));
107 iput(inode);
108out:
109 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
110 return res;
111}
112
113#if defined(CONFIG_NFS_V4_1)
114
115/*
116 * Lookup a layout inode by stateid
117 *
118 * Note: returns a refcount on the inode and superblock
119 */
120static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
121 const nfs4_stateid *stateid)
122{
123 struct nfs_server *server;
124 struct inode *inode;
125 struct pnfs_layout_hdr *lo;
126
127restart:
128 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
129 list_for_each_entry(lo, &server->layouts, plh_layouts) {
130 if (stateid != NULL &&
131 !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
132 continue;
133 inode = igrab(lo->plh_inode);
134 if (!inode)
135 continue;
136 if (!nfs_sb_active(inode->i_sb)) {
137 rcu_read_unlock();
138 spin_unlock(&clp->cl_lock);
139 iput(inode);
140 spin_lock(&clp->cl_lock);
141 rcu_read_lock();
142 goto restart;
143 }
144 return inode;
145 }
146 }
147
148 return NULL;
149}
150
151/*
152 * Lookup a layout inode by filehandle.
153 *
154 * Note: returns a refcount on the inode and superblock
155 *
156 */
157static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
158 const struct nfs_fh *fh)
159{
160 struct nfs_server *server;
161 struct nfs_inode *nfsi;
162 struct inode *inode;
163 struct pnfs_layout_hdr *lo;
164
165restart:
166 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
167 list_for_each_entry(lo, &server->layouts, plh_layouts) {
168 nfsi = NFS_I(lo->plh_inode);
169 if (nfs_compare_fh(fh, &nfsi->fh))
170 continue;
171 if (nfsi->layout != lo)
172 continue;
173 inode = igrab(lo->plh_inode);
174 if (!inode)
175 continue;
176 if (!nfs_sb_active(inode->i_sb)) {
177 rcu_read_unlock();
178 spin_unlock(&clp->cl_lock);
179 iput(inode);
180 spin_lock(&clp->cl_lock);
181 rcu_read_lock();
182 goto restart;
183 }
184 return inode;
185 }
186 }
187
188 return NULL;
189}
190
191static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
192 const struct nfs_fh *fh,
193 const nfs4_stateid *stateid)
194{
195 struct inode *inode;
196
197 spin_lock(&clp->cl_lock);
198 rcu_read_lock();
199 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
200 if (!inode)
201 inode = nfs_layout_find_inode_by_fh(clp, fh);
202 rcu_read_unlock();
203 spin_unlock(&clp->cl_lock);
204
205 return inode;
206}
207
208/*
209 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
210 */
211static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
212 const nfs4_stateid *new)
213{
214 u32 oldseq, newseq;
215
216 /* Is the stateid still not initialised? */
217 if (!pnfs_layout_is_valid(lo))
218 return NFS4ERR_DELAY;
219
220 /* Mismatched stateid? */
221 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
222 return NFS4ERR_BAD_STATEID;
223
224 newseq = be32_to_cpu(new->seqid);
225 /* Are we already in a layout recall situation? */
226 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
227 lo->plh_return_seq != 0) {
228 if (newseq < lo->plh_return_seq)
229 return NFS4ERR_OLD_STATEID;
230 if (newseq > lo->plh_return_seq)
231 return NFS4ERR_DELAY;
232 goto out;
233 }
234
235 /* Check that the stateid matches what we think it should be. */
236 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
237 if (newseq > oldseq + 1)
238 return NFS4ERR_DELAY;
239 /* Crazy server! */
240 if (newseq <= oldseq)
241 return NFS4ERR_OLD_STATEID;
242out:
243 return NFS_OK;
244}
245
246static u32 initiate_file_draining(struct nfs_client *clp,
247 struct cb_layoutrecallargs *args)
248{
249 struct inode *ino;
250 struct pnfs_layout_hdr *lo;
251 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
252 LIST_HEAD(free_me_list);
253
254 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
255 if (!ino)
256 goto out;
257
258 pnfs_layoutcommit_inode(ino, false);
259
260
261 spin_lock(&ino->i_lock);
262 lo = NFS_I(ino)->layout;
263 if (!lo) {
264 spin_unlock(&ino->i_lock);
265 goto out;
266 }
267 pnfs_get_layout_hdr(lo);
268 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
269 if (rv != NFS_OK)
270 goto unlock;
271 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
272
273 /*
274 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
275 */
276 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
277 rv = NFS4ERR_DELAY;
278 goto unlock;
279 }
280
281 if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
282 &args->cbl_range,
283 be32_to_cpu(args->cbl_stateid.seqid))) {
284 rv = NFS4_OK;
285 goto unlock;
286 }
287
288 /* Embrace your forgetfulness! */
289 rv = NFS4ERR_NOMATCHING_LAYOUT;
290
291 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
292 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
293 &args->cbl_range);
294 }
295unlock:
296 spin_unlock(&ino->i_lock);
297 pnfs_free_lseg_list(&free_me_list);
298 /* Free all lsegs that are attached to commit buckets */
299 nfs_commit_inode(ino, 0);
300 pnfs_put_layout_hdr(lo);
301out:
302 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
303 &args->cbl_stateid, -rv);
304 nfs_iput_and_deactive(ino);
305 return rv;
306}
307
308static u32 initiate_bulk_draining(struct nfs_client *clp,
309 struct cb_layoutrecallargs *args)
310{
311 int stat;
312
313 if (args->cbl_recall_type == RETURN_FSID)
314 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
315 else
316 stat = pnfs_destroy_layouts_byclid(clp, true);
317 if (stat != 0)
318 return NFS4ERR_DELAY;
319 return NFS4ERR_NOMATCHING_LAYOUT;
320}
321
322static u32 do_callback_layoutrecall(struct nfs_client *clp,
323 struct cb_layoutrecallargs *args)
324{
325 if (args->cbl_recall_type == RETURN_FILE)
326 return initiate_file_draining(clp, args);
327 return initiate_bulk_draining(clp, args);
328}
329
330__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
331 struct cb_process_state *cps)
332{
333 struct cb_layoutrecallargs *args = argp;
334 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
335
336 if (cps->clp)
337 res = do_callback_layoutrecall(cps->clp, args);
338 return cpu_to_be32(res);
339}
340
341static void pnfs_recall_all_layouts(struct nfs_client *clp)
342{
343 struct cb_layoutrecallargs args;
344
345 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
346 memset(&args, 0, sizeof(args));
347 args.cbl_recall_type = RETURN_ALL;
348 /* FIXME we ignore errors, what should we do? */
349 do_callback_layoutrecall(clp, &args);
350}
351
352__be32 nfs4_callback_devicenotify(void *argp, void *resp,
353 struct cb_process_state *cps)
354{
355 struct cb_devicenotifyargs *args = argp;
356 int i;
357 __be32 res = 0;
358 struct nfs_client *clp = cps->clp;
359 struct nfs_server *server = NULL;
360
361 if (!clp) {
362 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
363 goto out;
364 }
365
366 for (i = 0; i < args->ndevs; i++) {
367 struct cb_devicenotifyitem *dev = &args->devs[i];
368
369 if (!server ||
370 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
371 rcu_read_lock();
372 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
373 if (server->pnfs_curr_ld &&
374 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
375 rcu_read_unlock();
376 goto found;
377 }
378 rcu_read_unlock();
379 continue;
380 }
381
382 found:
383 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
384 }
385
386out:
387 kfree(args->devs);
388 return res;
389}
390
391/*
392 * Validate the sequenceID sent by the server.
393 * Return success if the sequenceID is one more than what we last saw on
394 * this slot, accounting for wraparound. Increments the slot's sequence.
395 *
396 * We don't yet implement a duplicate request cache, instead we set the
397 * back channel ca_maxresponsesize_cached to zero. This is OK for now
398 * since we only currently implement idempotent callbacks anyway.
399 *
400 * We have a single slot backchannel at this time, so we don't bother
401 * checking the used_slots bit array on the table. The lower layer guarantees
402 * a single outstanding callback request at a time.
403 */
404static __be32
405validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
406 const struct cb_sequenceargs * args)
407{
408 if (args->csa_slotid > tbl->server_highest_slotid)
409 return htonl(NFS4ERR_BADSLOT);
410
411 /* Replay */
412 if (args->csa_sequenceid == slot->seq_nr) {
413 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
414 return htonl(NFS4ERR_DELAY);
415 /* Signal process_op to set this error on next op */
416 if (args->csa_cachethis == 0)
417 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
418
419 /* Liar! We never allowed you to set csa_cachethis != 0 */
420 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
421 }
422
423 /* Wraparound */
424 if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
425 if (args->csa_sequenceid == 1)
426 return htonl(NFS4_OK);
427 } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
428 return htonl(NFS4_OK);
429
430 /* Misordered request */
431 return htonl(NFS4ERR_SEQ_MISORDERED);
432}
433
434/*
435 * For each referring call triple, check the session's slot table for
436 * a match. If the slot is in use and the sequence numbers match, the
437 * client is still waiting for a response to the original request.
438 */
439static bool referring_call_exists(struct nfs_client *clp,
440 uint32_t nrclists,
441 struct referring_call_list *rclists)
442{
443 bool status = false;
444 int i, j;
445 struct nfs4_session *session;
446 struct nfs4_slot_table *tbl;
447 struct referring_call_list *rclist;
448 struct referring_call *ref;
449
450 /*
451 * XXX When client trunking is implemented, this becomes
452 * a session lookup from within the loop
453 */
454 session = clp->cl_session;
455 tbl = &session->fc_slot_table;
456
457 for (i = 0; i < nrclists; i++) {
458 rclist = &rclists[i];
459 if (memcmp(session->sess_id.data,
460 rclist->rcl_sessionid.data,
461 NFS4_MAX_SESSIONID_LEN) != 0)
462 continue;
463
464 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
465 ref = &rclist->rcl_refcalls[j];
466 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
467 ref->rc_sequenceid, HZ >> 1) < 0;
468 if (status)
469 goto out;
470 }
471 }
472
473out:
474 return status;
475}
476
477__be32 nfs4_callback_sequence(void *argp, void *resp,
478 struct cb_process_state *cps)
479{
480 struct cb_sequenceargs *args = argp;
481 struct cb_sequenceres *res = resp;
482 struct nfs4_slot_table *tbl;
483 struct nfs4_slot *slot;
484 struct nfs_client *clp;
485 int i;
486 __be32 status = htonl(NFS4ERR_BADSESSION);
487
488 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
489 &args->csa_sessionid, cps->minorversion);
490 if (clp == NULL)
491 goto out;
492
493 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
494 goto out;
495
496 tbl = &clp->cl_session->bc_slot_table;
497
498 /* Set up res before grabbing the spinlock */
499 memcpy(&res->csr_sessionid, &args->csa_sessionid,
500 sizeof(res->csr_sessionid));
501 res->csr_sequenceid = args->csa_sequenceid;
502 res->csr_slotid = args->csa_slotid;
503
504 spin_lock(&tbl->slot_tbl_lock);
505 /* state manager is resetting the session */
506 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
507 status = htonl(NFS4ERR_DELAY);
508 /* Return NFS4ERR_BADSESSION if we're draining the session
509 * in order to reset it.
510 */
511 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
512 status = htonl(NFS4ERR_BADSESSION);
513 goto out_unlock;
514 }
515
516 status = htonl(NFS4ERR_BADSLOT);
517 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
518 if (IS_ERR(slot))
519 goto out_unlock;
520
521 res->csr_highestslotid = tbl->server_highest_slotid;
522 res->csr_target_highestslotid = tbl->target_highest_slotid;
523
524 status = validate_seqid(tbl, slot, args);
525 if (status)
526 goto out_unlock;
527 if (!nfs4_try_to_lock_slot(tbl, slot)) {
528 status = htonl(NFS4ERR_DELAY);
529 goto out_unlock;
530 }
531 cps->slot = slot;
532
533 /* The ca_maxresponsesize_cached is 0 with no DRC */
534 if (args->csa_cachethis != 0) {
535 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
536 goto out_unlock;
537 }
538
539 /*
540 * Check for pending referring calls. If a match is found, a
541 * related callback was received before the response to the original
542 * call.
543 */
544 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
545 status = htonl(NFS4ERR_DELAY);
546 goto out_unlock;
547 }
548
549 /*
550 * RFC5661 20.9.3
551 * If CB_SEQUENCE returns an error, then the state of the slot
552 * (sequence ID, cached reply) MUST NOT change.
553 */
554 slot->seq_nr = args->csa_sequenceid;
555out_unlock:
556 spin_unlock(&tbl->slot_tbl_lock);
557
558out:
559 cps->clp = clp; /* put in nfs4_callback_compound */
560 for (i = 0; i < args->csa_nrclists; i++)
561 kfree(args->csa_rclists[i].rcl_refcalls);
562 kfree(args->csa_rclists);
563
564 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
565 cps->drc_status = status;
566 status = 0;
567 } else
568 res->csr_status = status;
569
570 trace_nfs4_cb_sequence(args, res, status);
571 return status;
572}
573
574static bool
575validate_bitmap_values(unsigned int mask)
576{
577 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
578}
579
580__be32 nfs4_callback_recallany(void *argp, void *resp,
581 struct cb_process_state *cps)
582{
583 struct cb_recallanyargs *args = argp;
584 __be32 status;
585 fmode_t flags = 0;
586
587 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
588 if (!cps->clp) /* set in cb_sequence */
589 goto out;
590
591 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
592 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
593
594 status = cpu_to_be32(NFS4ERR_INVAL);
595 if (!validate_bitmap_values(args->craa_type_mask))
596 goto out;
597
598 status = cpu_to_be32(NFS4_OK);
599 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
600 flags = FMODE_READ;
601 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
602 flags |= FMODE_WRITE;
603 if (flags)
604 nfs_expire_unused_delegation_types(cps->clp, flags);
605
606 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
607 pnfs_recall_all_layouts(cps->clp);
608out:
609 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
610 return status;
611}
612
613/* Reduce the fore channel's max_slots to the target value */
614__be32 nfs4_callback_recallslot(void *argp, void *resp,
615 struct cb_process_state *cps)
616{
617 struct cb_recallslotargs *args = argp;
618 struct nfs4_slot_table *fc_tbl;
619 __be32 status;
620
621 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
622 if (!cps->clp) /* set in cb_sequence */
623 goto out;
624
625 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
626 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
627 args->crsa_target_highest_slotid);
628
629 fc_tbl = &cps->clp->cl_session->fc_slot_table;
630
631 status = htonl(NFS4_OK);
632
633 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
634 nfs41_notify_server(cps->clp);
635out:
636 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
637 return status;
638}
639
640__be32 nfs4_callback_notify_lock(void *argp, void *resp,
641 struct cb_process_state *cps)
642{
643 struct cb_notify_lock_args *args = argp;
644
645 if (!cps->clp) /* set in cb_sequence */
646 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
647
648 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
649 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
650
651 /* Don't wake anybody if the string looked bogus */
652 if (args->cbnl_valid)
653 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
654
655 return htonl(NFS4_OK);
656}
657#endif /* CONFIG_NFS_V4_1 */
1/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
8#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
10#include <linux/slab.h>
11#include <linux/rcupdate.h>
12#include "nfs4_fs.h"
13#include "callback.h"
14#include "delegation.h"
15#include "internal.h"
16#include "pnfs.h"
17#include "nfs4session.h"
18#include "nfs4trace.h"
19
20#define NFSDBG_FACILITY NFSDBG_CALLBACK
21
22__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
23 struct cb_getattrres *res,
24 struct cb_process_state *cps)
25{
26 struct nfs_delegation *delegation;
27 struct nfs_inode *nfsi;
28 struct inode *inode;
29
30 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
31 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
32 goto out;
33
34 res->bitmap[0] = res->bitmap[1] = 0;
35 res->status = htonl(NFS4ERR_BADHANDLE);
36
37 dprintk_rcu("NFS: GETATTR callback request from %s\n",
38 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
39
40 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
41 if (inode == NULL) {
42 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
43 -ntohl(res->status));
44 goto out;
45 }
46 nfsi = NFS_I(inode);
47 rcu_read_lock();
48 delegation = rcu_dereference(nfsi->delegation);
49 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
50 goto out_iput;
51 res->size = i_size_read(inode);
52 res->change_attr = delegation->change_attr;
53 if (nfsi->nrequests != 0)
54 res->change_attr++;
55 res->ctime = inode->i_ctime;
56 res->mtime = inode->i_mtime;
57 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
58 args->bitmap[0];
59 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
60 args->bitmap[1];
61 res->status = 0;
62out_iput:
63 rcu_read_unlock();
64 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
65 iput(inode);
66out:
67 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
68 return res->status;
69}
70
71__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
72 struct cb_process_state *cps)
73{
74 struct inode *inode;
75 __be32 res;
76
77 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
78 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
79 goto out;
80
81 dprintk_rcu("NFS: RECALL callback request from %s\n",
82 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
83
84 res = htonl(NFS4ERR_BADHANDLE);
85 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
86 if (inode == NULL) {
87 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
88 &args->stateid, -ntohl(res));
89 goto out;
90 }
91 /* Set up a helper thread to actually return the delegation */
92 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
93 case 0:
94 res = 0;
95 break;
96 case -ENOENT:
97 res = htonl(NFS4ERR_BAD_STATEID);
98 break;
99 default:
100 res = htonl(NFS4ERR_RESOURCE);
101 }
102 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
103 &args->stateid, -ntohl(res));
104 iput(inode);
105out:
106 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
107 return res;
108}
109
110#if defined(CONFIG_NFS_V4_1)
111
112/*
113 * Lookup a layout by filehandle.
114 *
115 * Note: gets a refcount on the layout hdr and on its respective inode.
116 * Caller must put the layout hdr and the inode.
117 *
118 * TODO: keep track of all layouts (and delegations) in a hash table
119 * hashed by filehandle.
120 */
121static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
122 struct nfs_fh *fh, nfs4_stateid *stateid)
123{
124 struct nfs_server *server;
125 struct inode *ino;
126 struct pnfs_layout_hdr *lo;
127
128 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
129 list_for_each_entry(lo, &server->layouts, plh_layouts) {
130 if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid))
131 continue;
132 if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
133 continue;
134 ino = igrab(lo->plh_inode);
135 if (!ino)
136 break;
137 spin_lock(&ino->i_lock);
138 /* Is this layout in the process of being freed? */
139 if (NFS_I(ino)->layout != lo) {
140 spin_unlock(&ino->i_lock);
141 iput(ino);
142 break;
143 }
144 pnfs_get_layout_hdr(lo);
145 spin_unlock(&ino->i_lock);
146 return lo;
147 }
148 }
149
150 return NULL;
151}
152
153static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
154 struct nfs_fh *fh, nfs4_stateid *stateid)
155{
156 struct pnfs_layout_hdr *lo;
157
158 spin_lock(&clp->cl_lock);
159 rcu_read_lock();
160 lo = get_layout_by_fh_locked(clp, fh, stateid);
161 rcu_read_unlock();
162 spin_unlock(&clp->cl_lock);
163
164 return lo;
165}
166
167/*
168 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
169 */
170static bool pnfs_check_stateid_sequence(struct pnfs_layout_hdr *lo,
171 const nfs4_stateid *new)
172{
173 u32 oldseq, newseq;
174
175 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
176 newseq = be32_to_cpu(new->seqid);
177
178 if (newseq > oldseq + 1)
179 return false;
180 return true;
181}
182
183static u32 initiate_file_draining(struct nfs_client *clp,
184 struct cb_layoutrecallargs *args)
185{
186 struct inode *ino;
187 struct pnfs_layout_hdr *lo;
188 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
189 LIST_HEAD(free_me_list);
190
191 lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid);
192 if (!lo) {
193 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, NULL,
194 &args->cbl_stateid, -rv);
195 goto out;
196 }
197
198 ino = lo->plh_inode;
199
200 spin_lock(&ino->i_lock);
201 if (!pnfs_check_stateid_sequence(lo, &args->cbl_stateid)) {
202 rv = NFS4ERR_DELAY;
203 goto unlock;
204 }
205 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
206 spin_unlock(&ino->i_lock);
207
208 pnfs_layoutcommit_inode(ino, false);
209
210 spin_lock(&ino->i_lock);
211 /*
212 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
213 */
214 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
215 rv = NFS4ERR_DELAY;
216 goto unlock;
217 }
218
219 if (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
220 &args->cbl_range)) {
221 rv = NFS4_OK;
222 goto unlock;
223 }
224
225 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
226 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
227 &args->cbl_range);
228 }
229 pnfs_mark_layout_returned_if_empty(lo);
230unlock:
231 spin_unlock(&ino->i_lock);
232 pnfs_free_lseg_list(&free_me_list);
233 /* Free all lsegs that are attached to commit buckets */
234 nfs_commit_inode(ino, 0);
235 pnfs_put_layout_hdr(lo);
236 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
237 &args->cbl_stateid, -rv);
238 iput(ino);
239out:
240 return rv;
241}
242
243static u32 initiate_bulk_draining(struct nfs_client *clp,
244 struct cb_layoutrecallargs *args)
245{
246 int stat;
247
248 if (args->cbl_recall_type == RETURN_FSID)
249 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
250 else
251 stat = pnfs_destroy_layouts_byclid(clp, true);
252 if (stat != 0)
253 return NFS4ERR_DELAY;
254 return NFS4ERR_NOMATCHING_LAYOUT;
255}
256
257static u32 do_callback_layoutrecall(struct nfs_client *clp,
258 struct cb_layoutrecallargs *args)
259{
260 u32 res;
261
262 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
263 if (args->cbl_recall_type == RETURN_FILE)
264 res = initiate_file_draining(clp, args);
265 else
266 res = initiate_bulk_draining(clp, args);
267 dprintk("%s returning %i\n", __func__, res);
268 return res;
269
270}
271
272__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
273 void *dummy, struct cb_process_state *cps)
274{
275 u32 res;
276
277 dprintk("%s: -->\n", __func__);
278
279 if (cps->clp)
280 res = do_callback_layoutrecall(cps->clp, args);
281 else
282 res = NFS4ERR_OP_NOT_IN_SESSION;
283
284 dprintk("%s: exit with status = %d\n", __func__, res);
285 return cpu_to_be32(res);
286}
287
288static void pnfs_recall_all_layouts(struct nfs_client *clp)
289{
290 struct cb_layoutrecallargs args;
291
292 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
293 memset(&args, 0, sizeof(args));
294 args.cbl_recall_type = RETURN_ALL;
295 /* FIXME we ignore errors, what should we do? */
296 do_callback_layoutrecall(clp, &args);
297}
298
299__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
300 void *dummy, struct cb_process_state *cps)
301{
302 int i;
303 __be32 res = 0;
304 struct nfs_client *clp = cps->clp;
305 struct nfs_server *server = NULL;
306
307 dprintk("%s: -->\n", __func__);
308
309 if (!clp) {
310 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
311 goto out;
312 }
313
314 for (i = 0; i < args->ndevs; i++) {
315 struct cb_devicenotifyitem *dev = &args->devs[i];
316
317 if (!server ||
318 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
319 rcu_read_lock();
320 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
321 if (server->pnfs_curr_ld &&
322 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
323 rcu_read_unlock();
324 goto found;
325 }
326 rcu_read_unlock();
327 dprintk("%s: layout type %u not found\n",
328 __func__, dev->cbd_layout_type);
329 continue;
330 }
331
332 found:
333 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
334 }
335
336out:
337 kfree(args->devs);
338 dprintk("%s: exit with status = %u\n",
339 __func__, be32_to_cpu(res));
340 return res;
341}
342
343/*
344 * Validate the sequenceID sent by the server.
345 * Return success if the sequenceID is one more than what we last saw on
346 * this slot, accounting for wraparound. Increments the slot's sequence.
347 *
348 * We don't yet implement a duplicate request cache, instead we set the
349 * back channel ca_maxresponsesize_cached to zero. This is OK for now
350 * since we only currently implement idempotent callbacks anyway.
351 *
352 * We have a single slot backchannel at this time, so we don't bother
353 * checking the used_slots bit array on the table. The lower layer guarantees
354 * a single outstanding callback request at a time.
355 */
356static __be32
357validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
358 const struct cb_sequenceargs * args)
359{
360 dprintk("%s enter. slotid %u seqid %u, slot table seqid: %u\n",
361 __func__, args->csa_slotid, args->csa_sequenceid, slot->seq_nr);
362
363 if (args->csa_slotid > tbl->server_highest_slotid)
364 return htonl(NFS4ERR_BADSLOT);
365
366 /* Replay */
367 if (args->csa_sequenceid == slot->seq_nr) {
368 dprintk("%s seqid %u is a replay\n",
369 __func__, args->csa_sequenceid);
370 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
371 return htonl(NFS4ERR_DELAY);
372 /* Signal process_op to set this error on next op */
373 if (args->csa_cachethis == 0)
374 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
375
376 /* Liar! We never allowed you to set csa_cachethis != 0 */
377 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
378 }
379
380 /* Wraparound */
381 if (unlikely(slot->seq_nr == 0xFFFFFFFFU)) {
382 if (args->csa_sequenceid == 1)
383 return htonl(NFS4_OK);
384 } else if (likely(args->csa_sequenceid == slot->seq_nr + 1))
385 return htonl(NFS4_OK);
386
387 /* Misordered request */
388 return htonl(NFS4ERR_SEQ_MISORDERED);
389}
390
391/*
392 * For each referring call triple, check the session's slot table for
393 * a match. If the slot is in use and the sequence numbers match, the
394 * client is still waiting for a response to the original request.
395 */
396static bool referring_call_exists(struct nfs_client *clp,
397 uint32_t nrclists,
398 struct referring_call_list *rclists)
399{
400 bool status = 0;
401 int i, j;
402 struct nfs4_session *session;
403 struct nfs4_slot_table *tbl;
404 struct referring_call_list *rclist;
405 struct referring_call *ref;
406
407 /*
408 * XXX When client trunking is implemented, this becomes
409 * a session lookup from within the loop
410 */
411 session = clp->cl_session;
412 tbl = &session->fc_slot_table;
413
414 for (i = 0; i < nrclists; i++) {
415 rclist = &rclists[i];
416 if (memcmp(session->sess_id.data,
417 rclist->rcl_sessionid.data,
418 NFS4_MAX_SESSIONID_LEN) != 0)
419 continue;
420
421 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
422 ref = &rclist->rcl_refcalls[j];
423
424 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
425 "slotid %u\n", __func__,
426 ((u32 *)&rclist->rcl_sessionid.data)[0],
427 ((u32 *)&rclist->rcl_sessionid.data)[1],
428 ((u32 *)&rclist->rcl_sessionid.data)[2],
429 ((u32 *)&rclist->rcl_sessionid.data)[3],
430 ref->rc_sequenceid, ref->rc_slotid);
431
432 spin_lock(&tbl->slot_tbl_lock);
433 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
434 tbl->slots[ref->rc_slotid].seq_nr ==
435 ref->rc_sequenceid);
436 spin_unlock(&tbl->slot_tbl_lock);
437 if (status)
438 goto out;
439 }
440 }
441
442out:
443 return status;
444}
445
446__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
447 struct cb_sequenceres *res,
448 struct cb_process_state *cps)
449{
450 struct nfs4_slot_table *tbl;
451 struct nfs4_slot *slot;
452 struct nfs_client *clp;
453 int i;
454 __be32 status = htonl(NFS4ERR_BADSESSION);
455
456 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
457 &args->csa_sessionid, cps->minorversion);
458 if (clp == NULL)
459 goto out;
460
461 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
462 goto out;
463
464 tbl = &clp->cl_session->bc_slot_table;
465 slot = tbl->slots + args->csa_slotid;
466
467 /* Set up res before grabbing the spinlock */
468 memcpy(&res->csr_sessionid, &args->csa_sessionid,
469 sizeof(res->csr_sessionid));
470 res->csr_sequenceid = args->csa_sequenceid;
471 res->csr_slotid = args->csa_slotid;
472
473 spin_lock(&tbl->slot_tbl_lock);
474 /* state manager is resetting the session */
475 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
476 status = htonl(NFS4ERR_DELAY);
477 /* Return NFS4ERR_BADSESSION if we're draining the session
478 * in order to reset it.
479 */
480 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
481 status = htonl(NFS4ERR_BADSESSION);
482 goto out_unlock;
483 }
484
485 status = htonl(NFS4ERR_BADSLOT);
486 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
487 if (IS_ERR(slot))
488 goto out_unlock;
489
490 res->csr_highestslotid = tbl->server_highest_slotid;
491 res->csr_target_highestslotid = tbl->target_highest_slotid;
492
493 status = validate_seqid(tbl, slot, args);
494 if (status)
495 goto out_unlock;
496 if (!nfs4_try_to_lock_slot(tbl, slot)) {
497 status = htonl(NFS4ERR_DELAY);
498 goto out_unlock;
499 }
500 cps->slot = slot;
501
502 /* The ca_maxresponsesize_cached is 0 with no DRC */
503 if (args->csa_cachethis != 0)
504 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
505
506 /*
507 * Check for pending referring calls. If a match is found, a
508 * related callback was received before the response to the original
509 * call.
510 */
511 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
512 status = htonl(NFS4ERR_DELAY);
513 goto out_unlock;
514 }
515
516 /*
517 * RFC5661 20.9.3
518 * If CB_SEQUENCE returns an error, then the state of the slot
519 * (sequence ID, cached reply) MUST NOT change.
520 */
521 slot->seq_nr = args->csa_sequenceid;
522out_unlock:
523 spin_unlock(&tbl->slot_tbl_lock);
524
525out:
526 cps->clp = clp; /* put in nfs4_callback_compound */
527 for (i = 0; i < args->csa_nrclists; i++)
528 kfree(args->csa_rclists[i].rcl_refcalls);
529 kfree(args->csa_rclists);
530
531 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
532 cps->drc_status = status;
533 status = 0;
534 } else
535 res->csr_status = status;
536
537 trace_nfs4_cb_sequence(args, res, status);
538 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
539 ntohl(status), ntohl(res->csr_status));
540 return status;
541}
542
543static bool
544validate_bitmap_values(unsigned long mask)
545{
546 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
547}
548
549__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
550 struct cb_process_state *cps)
551{
552 __be32 status;
553 fmode_t flags = 0;
554
555 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
556 if (!cps->clp) /* set in cb_sequence */
557 goto out;
558
559 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
560 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
561
562 status = cpu_to_be32(NFS4ERR_INVAL);
563 if (!validate_bitmap_values(args->craa_type_mask))
564 goto out;
565
566 status = cpu_to_be32(NFS4_OK);
567 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
568 &args->craa_type_mask))
569 flags = FMODE_READ;
570 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
571 &args->craa_type_mask))
572 flags |= FMODE_WRITE;
573 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
574 &args->craa_type_mask))
575 pnfs_recall_all_layouts(cps->clp);
576 if (flags)
577 nfs_expire_unused_delegation_types(cps->clp, flags);
578out:
579 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
580 return status;
581}
582
583/* Reduce the fore channel's max_slots to the target value */
584__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
585 struct cb_process_state *cps)
586{
587 struct nfs4_slot_table *fc_tbl;
588 __be32 status;
589
590 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
591 if (!cps->clp) /* set in cb_sequence */
592 goto out;
593
594 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
595 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
596 args->crsa_target_highest_slotid);
597
598 fc_tbl = &cps->clp->cl_session->fc_slot_table;
599
600 status = htonl(NFS4_OK);
601
602 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
603 nfs41_notify_server(cps->clp);
604out:
605 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
606 return status;
607}
608#endif /* CONFIG_NFS_V4_1 */