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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// 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
10#include <linux/errno.h>
11#include <linux/math.h>
12#include <linux/nfs4.h>
13#include <linux/nfs_fs.h>
14#include <linux/slab.h>
15#include <linux/rcupdate.h>
16#include <linux/types.h>
17
18#include "nfs4_fs.h"
19#include "callback.h"
20#include "delegation.h"
21#include "internal.h"
22#include "pnfs.h"
23#include "nfs4session.h"
24#include "nfs4trace.h"
25
26#define NFSDBG_FACILITY NFSDBG_CALLBACK
27
28__be32 nfs4_callback_getattr(void *argp, void *resp,
29 struct cb_process_state *cps)
30{
31 struct cb_getattrargs *args = argp;
32 struct cb_getattrres *res = resp;
33 struct nfs_delegation *delegation;
34 struct inode *inode;
35
36 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
37 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
38 goto out;
39
40 res->bitmap[0] = res->bitmap[1] = 0;
41 res->status = htonl(NFS4ERR_BADHANDLE);
42
43 dprintk_rcu("NFS: GETATTR callback request from %s\n",
44 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
45
46 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
47 if (IS_ERR(inode)) {
48 if (inode == ERR_PTR(-EAGAIN))
49 res->status = htonl(NFS4ERR_DELAY);
50 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
51 -ntohl(res->status));
52 goto out;
53 }
54 rcu_read_lock();
55 delegation = nfs4_get_valid_delegation(inode);
56 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
57 goto out_iput;
58 res->size = i_size_read(inode);
59 res->change_attr = delegation->change_attr;
60 if (nfs_have_writebacks(inode))
61 res->change_attr++;
62 res->ctime = inode_get_ctime(inode);
63 res->mtime = inode_get_mtime(inode);
64 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
65 args->bitmap[0];
66 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
67 args->bitmap[1];
68 res->status = 0;
69out_iput:
70 rcu_read_unlock();
71 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
72 nfs_iput_and_deactive(inode);
73out:
74 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
75 return res->status;
76}
77
78__be32 nfs4_callback_recall(void *argp, void *resp,
79 struct cb_process_state *cps)
80{
81 struct cb_recallargs *args = argp;
82 struct inode *inode;
83 __be32 res;
84
85 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
86 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
87 goto out;
88
89 dprintk_rcu("NFS: RECALL callback request from %s\n",
90 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
91
92 res = htonl(NFS4ERR_BADHANDLE);
93 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
94 if (IS_ERR(inode)) {
95 if (inode == ERR_PTR(-EAGAIN))
96 res = htonl(NFS4ERR_DELAY);
97 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
98 &args->stateid, -ntohl(res));
99 goto out;
100 }
101 /* Set up a helper thread to actually return the delegation */
102 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
103 case 0:
104 res = 0;
105 break;
106 case -ENOENT:
107 res = htonl(NFS4ERR_BAD_STATEID);
108 break;
109 default:
110 res = htonl(NFS4ERR_RESOURCE);
111 }
112 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
113 &args->stateid, -ntohl(res));
114 nfs_iput_and_deactive(inode);
115out:
116 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
117 return res;
118}
119
120#if defined(CONFIG_NFS_V4_1)
121
122/*
123 * Lookup a layout inode by stateid
124 *
125 * Note: returns a refcount on the inode and superblock
126 */
127static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
128 const nfs4_stateid *stateid)
129 __must_hold(RCU)
130{
131 struct nfs_server *server;
132 struct inode *inode;
133 struct pnfs_layout_hdr *lo;
134
135 rcu_read_lock();
136 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
137 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
138 if (!pnfs_layout_is_valid(lo))
139 continue;
140 if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
141 continue;
142 if (nfs_sb_active(server->super))
143 inode = igrab(lo->plh_inode);
144 else
145 inode = ERR_PTR(-EAGAIN);
146 rcu_read_unlock();
147 if (inode)
148 return inode;
149 nfs_sb_deactive(server->super);
150 return ERR_PTR(-EAGAIN);
151 }
152 }
153 rcu_read_unlock();
154 return ERR_PTR(-ENOENT);
155}
156
157/*
158 * Lookup a layout inode by filehandle.
159 *
160 * Note: returns a refcount on the inode and superblock
161 *
162 */
163static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
164 const struct nfs_fh *fh)
165{
166 struct nfs_server *server;
167 struct nfs_inode *nfsi;
168 struct inode *inode;
169 struct pnfs_layout_hdr *lo;
170
171 rcu_read_lock();
172 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
173 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
174 nfsi = NFS_I(lo->plh_inode);
175 if (nfs_compare_fh(fh, &nfsi->fh))
176 continue;
177 if (nfsi->layout != lo)
178 continue;
179 if (nfs_sb_active(server->super))
180 inode = igrab(lo->plh_inode);
181 else
182 inode = ERR_PTR(-EAGAIN);
183 rcu_read_unlock();
184 if (inode)
185 return inode;
186 nfs_sb_deactive(server->super);
187 return ERR_PTR(-EAGAIN);
188 }
189 }
190 rcu_read_unlock();
191 return ERR_PTR(-ENOENT);
192}
193
194static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
195 const struct nfs_fh *fh,
196 const nfs4_stateid *stateid)
197{
198 struct inode *inode;
199
200 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
201 if (inode == ERR_PTR(-ENOENT))
202 inode = nfs_layout_find_inode_by_fh(clp, fh);
203 return inode;
204}
205
206/*
207 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
208 */
209static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
210 const nfs4_stateid *new,
211 struct cb_process_state *cps)
212{
213 u32 oldseq, newseq;
214
215 /* Is the stateid not initialised? */
216 if (!pnfs_layout_is_valid(lo))
217 return NFS4ERR_NOMATCHING_LAYOUT;
218
219 /* Mismatched stateid? */
220 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
221 return NFS4ERR_BAD_STATEID;
222
223 newseq = be32_to_cpu(new->seqid);
224 /* Are we already in a layout recall situation? */
225 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
226 return NFS4ERR_DELAY;
227
228 /*
229 * Check that the stateid matches what we think it should be.
230 * Note that if the server sent us a list of referring calls,
231 * and we know that those have completed, then we trust the
232 * stateid argument is correct.
233 */
234 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
235 if (newseq > oldseq + 1 && !cps->referring_calls)
236 return NFS4ERR_DELAY;
237
238 /* Crazy server! */
239 if (newseq <= oldseq)
240 return NFS4ERR_OLD_STATEID;
241
242 return NFS_OK;
243}
244
245static u32 initiate_file_draining(struct nfs_client *clp,
246 struct cb_layoutrecallargs *args,
247 struct cb_process_state *cps)
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 (IS_ERR(ino)) {
256 if (ino == ERR_PTR(-EAGAIN))
257 rv = NFS4ERR_DELAY;
258 goto out_noput;
259 }
260
261 pnfs_layoutcommit_inode(ino, false);
262
263
264 spin_lock(&ino->i_lock);
265 lo = NFS_I(ino)->layout;
266 if (!lo) {
267 spin_unlock(&ino->i_lock);
268 goto out;
269 }
270 pnfs_get_layout_hdr(lo);
271 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid, cps);
272 if (rv != NFS_OK)
273 goto unlock;
274
275 /*
276 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
277 */
278 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
279 rv = NFS4ERR_DELAY;
280 goto unlock;
281 }
282
283 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
284 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
285 &args->cbl_range,
286 be32_to_cpu(args->cbl_stateid.seqid))) {
287 case 0:
288 case -EBUSY:
289 /* There are layout segments that need to be returned */
290 rv = NFS4_OK;
291 break;
292 case -ENOENT:
293 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
294 /* Embrace your forgetfulness! */
295 rv = NFS4ERR_NOMATCHING_LAYOUT;
296
297 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
298 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
299 &args->cbl_range);
300 }
301 }
302unlock:
303 spin_unlock(&ino->i_lock);
304 pnfs_free_lseg_list(&free_me_list);
305 /* Free all lsegs that are attached to commit buckets */
306 nfs_commit_inode(ino, 0);
307 pnfs_put_layout_hdr(lo);
308out:
309 nfs_iput_and_deactive(ino);
310out_noput:
311 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
312 &args->cbl_stateid, -rv);
313 return rv;
314}
315
316static u32 initiate_bulk_draining(struct nfs_client *clp,
317 struct cb_layoutrecallargs *args)
318{
319 int stat;
320
321 if (args->cbl_recall_type == RETURN_FSID)
322 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
323 else
324 stat = pnfs_destroy_layouts_byclid(clp, true);
325 if (stat != 0)
326 return NFS4ERR_DELAY;
327 return NFS4ERR_NOMATCHING_LAYOUT;
328}
329
330static u32 do_callback_layoutrecall(struct nfs_client *clp,
331 struct cb_layoutrecallargs *args,
332 struct cb_process_state *cps)
333{
334 if (args->cbl_recall_type == RETURN_FILE)
335 return initiate_file_draining(clp, args, cps);
336 return initiate_bulk_draining(clp, args);
337}
338
339__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
340 struct cb_process_state *cps)
341{
342 struct cb_layoutrecallargs *args = argp;
343 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
344
345 if (cps->clp)
346 res = do_callback_layoutrecall(cps->clp, args, cps);
347 return cpu_to_be32(res);
348}
349
350static void pnfs_recall_all_layouts(struct nfs_client *clp,
351 struct cb_process_state *cps)
352{
353 struct cb_layoutrecallargs args;
354
355 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
356 memset(&args, 0, sizeof(args));
357 args.cbl_recall_type = RETURN_ALL;
358 /* FIXME we ignore errors, what should we do? */
359 do_callback_layoutrecall(clp, &args, cps);
360}
361
362__be32 nfs4_callback_devicenotify(void *argp, void *resp,
363 struct cb_process_state *cps)
364{
365 struct cb_devicenotifyargs *args = argp;
366 const struct pnfs_layoutdriver_type *ld = NULL;
367 uint32_t i;
368 __be32 res = 0;
369
370 if (!cps->clp) {
371 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
372 goto out;
373 }
374
375 for (i = 0; i < args->ndevs; i++) {
376 struct cb_devicenotifyitem *dev = &args->devs[i];
377
378 if (!ld || ld->id != dev->cbd_layout_type) {
379 pnfs_put_layoutdriver(ld);
380 ld = pnfs_find_layoutdriver(dev->cbd_layout_type);
381 if (!ld)
382 continue;
383 }
384 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id);
385 }
386 pnfs_put_layoutdriver(ld);
387out:
388 kfree(args->devs);
389 return res;
390}
391
392/*
393 * Validate the sequenceID sent by the server.
394 * Return success if the sequenceID is one more than what we last saw on
395 * this slot, accounting for wraparound. Increments the slot's sequence.
396 *
397 * We don't yet implement a duplicate request cache, instead we set the
398 * back channel ca_maxresponsesize_cached to zero. This is OK for now
399 * since we only currently implement idempotent callbacks anyway.
400 *
401 * We have a single slot backchannel at this time, so we don't bother
402 * checking the used_slots bit array on the table. The lower layer guarantees
403 * a single outstanding callback request at a time.
404 */
405static __be32
406validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
407 const struct cb_sequenceargs * args)
408{
409 __be32 ret;
410
411 ret = cpu_to_be32(NFS4ERR_BADSLOT);
412 if (args->csa_slotid > tbl->server_highest_slotid)
413 goto out_err;
414
415 /* Replay */
416 if (args->csa_sequenceid == slot->seq_nr) {
417 ret = cpu_to_be32(NFS4ERR_DELAY);
418 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
419 goto out_err;
420
421 /* Signal process_op to set this error on next op */
422 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
423 if (args->csa_cachethis == 0)
424 goto out_err;
425
426 /* Liar! We never allowed you to set csa_cachethis != 0 */
427 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
428 goto out_err;
429 }
430
431 /* Note: wraparound relies on seq_nr being of type u32 */
432 /* Misordered request */
433 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
434 if (args->csa_sequenceid != slot->seq_nr + 1)
435 goto out_err;
436
437 return cpu_to_be32(NFS4_OK);
438
439out_err:
440 trace_nfs4_cb_seqid_err(args, ret);
441 return ret;
442}
443
444/*
445 * For each referring call triple, check the session's slot table for
446 * a match. If the slot is in use and the sequence numbers match, the
447 * client is still waiting for a response to the original request.
448 */
449static int referring_call_exists(struct nfs_client *clp,
450 uint32_t nrclists,
451 struct referring_call_list *rclists,
452 spinlock_t *lock)
453 __releases(lock)
454 __acquires(lock)
455{
456 int status = 0;
457 int found = 0;
458 int i, j;
459 struct nfs4_session *session;
460 struct nfs4_slot_table *tbl;
461 struct referring_call_list *rclist;
462 struct referring_call *ref;
463
464 /*
465 * XXX When client trunking is implemented, this becomes
466 * a session lookup from within the loop
467 */
468 session = clp->cl_session;
469 tbl = &session->fc_slot_table;
470
471 for (i = 0; i < nrclists; i++) {
472 rclist = &rclists[i];
473 if (memcmp(session->sess_id.data,
474 rclist->rcl_sessionid.data,
475 NFS4_MAX_SESSIONID_LEN) != 0)
476 continue;
477
478 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
479 ref = &rclist->rcl_refcalls[j];
480 spin_unlock(lock);
481 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
482 ref->rc_sequenceid, HZ >> 1) < 0;
483 spin_lock(lock);
484 if (status)
485 goto out;
486 found++;
487 }
488 }
489
490out:
491 return status < 0 ? status : found;
492}
493
494__be32 nfs4_callback_sequence(void *argp, void *resp,
495 struct cb_process_state *cps)
496{
497 struct cb_sequenceargs *args = argp;
498 struct cb_sequenceres *res = resp;
499 struct nfs4_slot_table *tbl;
500 struct nfs4_slot *slot;
501 struct nfs_client *clp;
502 int ret;
503 int i;
504 __be32 status = htonl(NFS4ERR_BADSESSION);
505
506 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
507 &args->csa_sessionid, cps->minorversion);
508 if (clp == NULL)
509 goto out;
510
511 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
512 goto out;
513
514 tbl = &clp->cl_session->bc_slot_table;
515
516 /* Set up res before grabbing the spinlock */
517 memcpy(&res->csr_sessionid, &args->csa_sessionid,
518 sizeof(res->csr_sessionid));
519 res->csr_sequenceid = args->csa_sequenceid;
520 res->csr_slotid = args->csa_slotid;
521
522 spin_lock(&tbl->slot_tbl_lock);
523 /* state manager is resetting the session */
524 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
525 status = htonl(NFS4ERR_DELAY);
526 /* Return NFS4ERR_BADSESSION if we're draining the session
527 * in order to reset it.
528 */
529 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
530 status = htonl(NFS4ERR_BADSESSION);
531 goto out_unlock;
532 }
533
534 status = htonl(NFS4ERR_BADSLOT);
535 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
536 if (IS_ERR(slot))
537 goto out_unlock;
538
539 res->csr_highestslotid = tbl->server_highest_slotid;
540 res->csr_target_highestslotid = tbl->target_highest_slotid;
541
542 status = validate_seqid(tbl, slot, args);
543 if (status)
544 goto out_unlock;
545 if (!nfs4_try_to_lock_slot(tbl, slot)) {
546 status = htonl(NFS4ERR_DELAY);
547 goto out_unlock;
548 }
549 cps->slot = slot;
550
551 /* The ca_maxresponsesize_cached is 0 with no DRC */
552 if (args->csa_cachethis != 0) {
553 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
554 goto out_unlock;
555 }
556
557 /*
558 * Check for pending referring calls. If a match is found, a
559 * related callback was received before the response to the original
560 * call.
561 */
562 ret = referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
563 &tbl->slot_tbl_lock);
564 if (ret < 0) {
565 status = htonl(NFS4ERR_DELAY);
566 goto out_unlock;
567 }
568 cps->referring_calls = ret;
569
570 /*
571 * RFC5661 20.9.3
572 * If CB_SEQUENCE returns an error, then the state of the slot
573 * (sequence ID, cached reply) MUST NOT change.
574 */
575 slot->seq_nr = args->csa_sequenceid;
576out_unlock:
577 spin_unlock(&tbl->slot_tbl_lock);
578
579out:
580 cps->clp = clp; /* put in nfs4_callback_compound */
581 for (i = 0; i < args->csa_nrclists; i++)
582 kfree(args->csa_rclists[i].rcl_refcalls);
583 kfree(args->csa_rclists);
584
585 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
586 cps->drc_status = status;
587 status = 0;
588 } else
589 res->csr_status = status;
590
591 trace_nfs4_cb_sequence(args, res, status);
592 return status;
593}
594
595static bool
596validate_bitmap_values(unsigned int mask)
597{
598 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
599}
600
601__be32 nfs4_callback_recallany(void *argp, void *resp,
602 struct cb_process_state *cps)
603{
604 struct cb_recallanyargs *args = argp;
605 __be32 status;
606 fmode_t flags = 0;
607 bool schedule_manager = false;
608
609 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
610 if (!cps->clp) /* set in cb_sequence */
611 goto out;
612
613 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
614 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
615
616 status = cpu_to_be32(NFS4ERR_INVAL);
617 if (!validate_bitmap_values(args->craa_type_mask))
618 goto out;
619
620 status = cpu_to_be32(NFS4_OK);
621 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
622 flags = FMODE_READ;
623 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
624 flags |= FMODE_WRITE;
625 if (flags)
626 nfs_expire_unused_delegation_types(cps->clp, flags);
627
628 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
629 pnfs_recall_all_layouts(cps->clp, cps);
630
631 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
632 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
633 schedule_manager = true;
634 }
635 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
636 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
637 schedule_manager = true;
638 }
639 if (schedule_manager)
640 nfs4_schedule_state_manager(cps->clp);
641
642out:
643 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
644 return status;
645}
646
647/* Reduce the fore channel's max_slots to the target value */
648__be32 nfs4_callback_recallslot(void *argp, void *resp,
649 struct cb_process_state *cps)
650{
651 struct cb_recallslotargs *args = argp;
652 struct nfs4_slot_table *fc_tbl;
653 __be32 status;
654
655 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
656 if (!cps->clp) /* set in cb_sequence */
657 goto out;
658
659 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
660 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
661 args->crsa_target_highest_slotid);
662
663 fc_tbl = &cps->clp->cl_session->fc_slot_table;
664
665 status = htonl(NFS4_OK);
666
667 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
668 nfs41_notify_server(cps->clp);
669out:
670 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
671 return status;
672}
673
674__be32 nfs4_callback_notify_lock(void *argp, void *resp,
675 struct cb_process_state *cps)
676{
677 struct cb_notify_lock_args *args = argp;
678
679 if (!cps->clp) /* set in cb_sequence */
680 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
681
682 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
683 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
684
685 /* Don't wake anybody if the string looked bogus */
686 if (args->cbnl_valid)
687 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
688
689 return htonl(NFS4_OK);
690}
691#endif /* CONFIG_NFS_V4_1 */
692#ifdef CONFIG_NFS_V4_2
693static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
694 struct cb_offloadargs *args)
695{
696 cp_state->count = args->wr_count;
697 cp_state->error = args->error;
698 if (!args->error) {
699 cp_state->verf.committed = args->wr_writeverf.committed;
700 memcpy(&cp_state->verf.verifier.data[0],
701 &args->wr_writeverf.verifier.data[0],
702 NFS4_VERIFIER_SIZE);
703 }
704}
705
706__be32 nfs4_callback_offload(void *data, void *dummy,
707 struct cb_process_state *cps)
708{
709 struct cb_offloadargs *args = data;
710 struct nfs_server *server;
711 struct nfs4_copy_state *copy, *tmp_copy;
712 bool found = false;
713
714 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
715 if (!copy)
716 return htonl(NFS4ERR_SERVERFAULT);
717
718 spin_lock(&cps->clp->cl_lock);
719 rcu_read_lock();
720 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
721 client_link) {
722 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
723 if (memcmp(args->coa_stateid.other,
724 tmp_copy->stateid.other,
725 sizeof(args->coa_stateid.other)))
726 continue;
727 nfs4_copy_cb_args(tmp_copy, args);
728 complete(&tmp_copy->completion);
729 found = true;
730 goto out;
731 }
732 }
733out:
734 rcu_read_unlock();
735 if (!found) {
736 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
737 nfs4_copy_cb_args(copy, args);
738 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
739 } else
740 kfree(copy);
741 spin_unlock(&cps->clp->cl_lock);
742
743 trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid,
744 args->wr_count, args->error,
745 args->wr_writeverf.committed);
746 return 0;
747}
748#endif /* CONFIG_NFS_V4_2 */