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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->i_ctime;
63 res->mtime = inode->i_mtime;
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{
212 u32 oldseq, newseq;
213
214 /* Is the stateid not initialised? */
215 if (!pnfs_layout_is_valid(lo))
216 return NFS4ERR_NOMATCHING_LAYOUT;
217
218 /* Mismatched stateid? */
219 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
220 return NFS4ERR_BAD_STATEID;
221
222 newseq = be32_to_cpu(new->seqid);
223 /* Are we already in a layout recall situation? */
224 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
225 lo->plh_return_seq != 0) {
226 if (newseq < lo->plh_return_seq)
227 return NFS4ERR_OLD_STATEID;
228 if (newseq > lo->plh_return_seq)
229 return NFS4ERR_DELAY;
230 goto out;
231 }
232
233 /* Check that the stateid matches what we think it should be. */
234 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
235 if (newseq > oldseq + 1)
236 return NFS4ERR_DELAY;
237 /* Crazy server! */
238 if (newseq <= oldseq)
239 return NFS4ERR_OLD_STATEID;
240out:
241 return NFS_OK;
242}
243
244static u32 initiate_file_draining(struct nfs_client *clp,
245 struct cb_layoutrecallargs *args)
246{
247 struct inode *ino;
248 struct pnfs_layout_hdr *lo;
249 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
250 LIST_HEAD(free_me_list);
251
252 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
253 if (IS_ERR(ino)) {
254 if (ino == ERR_PTR(-EAGAIN))
255 rv = NFS4ERR_DELAY;
256 goto out_noput;
257 }
258
259 pnfs_layoutcommit_inode(ino, false);
260
261
262 spin_lock(&ino->i_lock);
263 lo = NFS_I(ino)->layout;
264 if (!lo) {
265 spin_unlock(&ino->i_lock);
266 goto out;
267 }
268 pnfs_get_layout_hdr(lo);
269 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
270 if (rv != NFS_OK)
271 goto unlock;
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 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
282 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
283 &args->cbl_range,
284 be32_to_cpu(args->cbl_stateid.seqid))) {
285 case 0:
286 case -EBUSY:
287 /* There are layout segments that need to be returned */
288 rv = NFS4_OK;
289 break;
290 case -ENOENT:
291 /* Embrace your forgetfulness! */
292 rv = NFS4ERR_NOMATCHING_LAYOUT;
293
294 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
295 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
296 &args->cbl_range);
297 }
298 }
299unlock:
300 spin_unlock(&ino->i_lock);
301 pnfs_free_lseg_list(&free_me_list);
302 /* Free all lsegs that are attached to commit buckets */
303 nfs_commit_inode(ino, 0);
304 pnfs_put_layout_hdr(lo);
305out:
306 nfs_iput_and_deactive(ino);
307out_noput:
308 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
309 &args->cbl_stateid, -rv);
310 return rv;
311}
312
313static u32 initiate_bulk_draining(struct nfs_client *clp,
314 struct cb_layoutrecallargs *args)
315{
316 int stat;
317
318 if (args->cbl_recall_type == RETURN_FSID)
319 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
320 else
321 stat = pnfs_destroy_layouts_byclid(clp, true);
322 if (stat != 0)
323 return NFS4ERR_DELAY;
324 return NFS4ERR_NOMATCHING_LAYOUT;
325}
326
327static u32 do_callback_layoutrecall(struct nfs_client *clp,
328 struct cb_layoutrecallargs *args)
329{
330 if (args->cbl_recall_type == RETURN_FILE)
331 return initiate_file_draining(clp, args);
332 return initiate_bulk_draining(clp, args);
333}
334
335__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
336 struct cb_process_state *cps)
337{
338 struct cb_layoutrecallargs *args = argp;
339 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
340
341 if (cps->clp)
342 res = do_callback_layoutrecall(cps->clp, args);
343 return cpu_to_be32(res);
344}
345
346static void pnfs_recall_all_layouts(struct nfs_client *clp)
347{
348 struct cb_layoutrecallargs args;
349
350 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
351 memset(&args, 0, sizeof(args));
352 args.cbl_recall_type = RETURN_ALL;
353 /* FIXME we ignore errors, what should we do? */
354 do_callback_layoutrecall(clp, &args);
355}
356
357__be32 nfs4_callback_devicenotify(void *argp, void *resp,
358 struct cb_process_state *cps)
359{
360 struct cb_devicenotifyargs *args = argp;
361 int i;
362 __be32 res = 0;
363 struct nfs_client *clp = cps->clp;
364 struct nfs_server *server = NULL;
365
366 if (!clp) {
367 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
368 goto out;
369 }
370
371 for (i = 0; i < args->ndevs; i++) {
372 struct cb_devicenotifyitem *dev = &args->devs[i];
373
374 if (!server ||
375 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
376 rcu_read_lock();
377 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
378 if (server->pnfs_curr_ld &&
379 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
380 rcu_read_unlock();
381 goto found;
382 }
383 rcu_read_unlock();
384 continue;
385 }
386
387 found:
388 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
389 }
390
391out:
392 kfree(args->devs);
393 return res;
394}
395
396/*
397 * Validate the sequenceID sent by the server.
398 * Return success if the sequenceID is one more than what we last saw on
399 * this slot, accounting for wraparound. Increments the slot's sequence.
400 *
401 * We don't yet implement a duplicate request cache, instead we set the
402 * back channel ca_maxresponsesize_cached to zero. This is OK for now
403 * since we only currently implement idempotent callbacks anyway.
404 *
405 * We have a single slot backchannel at this time, so we don't bother
406 * checking the used_slots bit array on the table. The lower layer guarantees
407 * a single outstanding callback request at a time.
408 */
409static __be32
410validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
411 const struct cb_sequenceargs * args)
412{
413 __be32 ret;
414
415 ret = cpu_to_be32(NFS4ERR_BADSLOT);
416 if (args->csa_slotid > tbl->server_highest_slotid)
417 goto out_err;
418
419 /* Replay */
420 if (args->csa_sequenceid == slot->seq_nr) {
421 ret = cpu_to_be32(NFS4ERR_DELAY);
422 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
423 goto out_err;
424
425 /* Signal process_op to set this error on next op */
426 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
427 if (args->csa_cachethis == 0)
428 goto out_err;
429
430 /* Liar! We never allowed you to set csa_cachethis != 0 */
431 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
432 goto out_err;
433 }
434
435 /* Note: wraparound relies on seq_nr being of type u32 */
436 /* Misordered request */
437 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
438 if (args->csa_sequenceid != slot->seq_nr + 1)
439 goto out_err;
440
441 return cpu_to_be32(NFS4_OK);
442
443out_err:
444 trace_nfs4_cb_seqid_err(args, ret);
445 return ret;
446}
447
448/*
449 * For each referring call triple, check the session's slot table for
450 * a match. If the slot is in use and the sequence numbers match, the
451 * client is still waiting for a response to the original request.
452 */
453static int referring_call_exists(struct nfs_client *clp,
454 uint32_t nrclists,
455 struct referring_call_list *rclists,
456 spinlock_t *lock)
457 __releases(lock)
458 __acquires(lock)
459{
460 int status = 0;
461 int i, j;
462 struct nfs4_session *session;
463 struct nfs4_slot_table *tbl;
464 struct referring_call_list *rclist;
465 struct referring_call *ref;
466
467 /*
468 * XXX When client trunking is implemented, this becomes
469 * a session lookup from within the loop
470 */
471 session = clp->cl_session;
472 tbl = &session->fc_slot_table;
473
474 for (i = 0; i < nrclists; i++) {
475 rclist = &rclists[i];
476 if (memcmp(session->sess_id.data,
477 rclist->rcl_sessionid.data,
478 NFS4_MAX_SESSIONID_LEN) != 0)
479 continue;
480
481 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
482 ref = &rclist->rcl_refcalls[j];
483 spin_unlock(lock);
484 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
485 ref->rc_sequenceid, HZ >> 1) < 0;
486 spin_lock(lock);
487 if (status)
488 goto out;
489 }
490 }
491
492out:
493 return status;
494}
495
496__be32 nfs4_callback_sequence(void *argp, void *resp,
497 struct cb_process_state *cps)
498{
499 struct cb_sequenceargs *args = argp;
500 struct cb_sequenceres *res = resp;
501 struct nfs4_slot_table *tbl;
502 struct nfs4_slot *slot;
503 struct nfs_client *clp;
504 int i;
505 __be32 status = htonl(NFS4ERR_BADSESSION);
506
507 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
508 &args->csa_sessionid, cps->minorversion);
509 if (clp == NULL)
510 goto out;
511
512 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
513 goto out;
514
515 tbl = &clp->cl_session->bc_slot_table;
516
517 /* Set up res before grabbing the spinlock */
518 memcpy(&res->csr_sessionid, &args->csa_sessionid,
519 sizeof(res->csr_sessionid));
520 res->csr_sequenceid = args->csa_sequenceid;
521 res->csr_slotid = args->csa_slotid;
522
523 spin_lock(&tbl->slot_tbl_lock);
524 /* state manager is resetting the session */
525 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
526 status = htonl(NFS4ERR_DELAY);
527 /* Return NFS4ERR_BADSESSION if we're draining the session
528 * in order to reset it.
529 */
530 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
531 status = htonl(NFS4ERR_BADSESSION);
532 goto out_unlock;
533 }
534
535 status = htonl(NFS4ERR_BADSLOT);
536 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
537 if (IS_ERR(slot))
538 goto out_unlock;
539
540 res->csr_highestslotid = tbl->server_highest_slotid;
541 res->csr_target_highestslotid = tbl->target_highest_slotid;
542
543 status = validate_seqid(tbl, slot, args);
544 if (status)
545 goto out_unlock;
546 if (!nfs4_try_to_lock_slot(tbl, slot)) {
547 status = htonl(NFS4ERR_DELAY);
548 goto out_unlock;
549 }
550 cps->slot = slot;
551
552 /* The ca_maxresponsesize_cached is 0 with no DRC */
553 if (args->csa_cachethis != 0) {
554 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
555 goto out_unlock;
556 }
557
558 /*
559 * Check for pending referring calls. If a match is found, a
560 * related callback was received before the response to the original
561 * call.
562 */
563 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
564 &tbl->slot_tbl_lock) < 0) {
565 status = htonl(NFS4ERR_DELAY);
566 goto out_unlock;
567 }
568
569 /*
570 * RFC5661 20.9.3
571 * If CB_SEQUENCE returns an error, then the state of the slot
572 * (sequence ID, cached reply) MUST NOT change.
573 */
574 slot->seq_nr = args->csa_sequenceid;
575out_unlock:
576 spin_unlock(&tbl->slot_tbl_lock);
577
578out:
579 cps->clp = clp; /* put in nfs4_callback_compound */
580 for (i = 0; i < args->csa_nrclists; i++)
581 kfree(args->csa_rclists[i].rcl_refcalls);
582 kfree(args->csa_rclists);
583
584 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
585 cps->drc_status = status;
586 status = 0;
587 } else
588 res->csr_status = status;
589
590 trace_nfs4_cb_sequence(args, res, status);
591 return status;
592}
593
594static bool
595validate_bitmap_values(unsigned int mask)
596{
597 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
598}
599
600__be32 nfs4_callback_recallany(void *argp, void *resp,
601 struct cb_process_state *cps)
602{
603 struct cb_recallanyargs *args = argp;
604 __be32 status;
605 fmode_t flags = 0;
606 bool schedule_manager = false;
607
608 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
609 if (!cps->clp) /* set in cb_sequence */
610 goto out;
611
612 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
613 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
614
615 status = cpu_to_be32(NFS4ERR_INVAL);
616 if (!validate_bitmap_values(args->craa_type_mask))
617 goto out;
618
619 status = cpu_to_be32(NFS4_OK);
620 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
621 flags = FMODE_READ;
622 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
623 flags |= FMODE_WRITE;
624 if (flags)
625 nfs_expire_unused_delegation_types(cps->clp, flags);
626
627 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
628 pnfs_recall_all_layouts(cps->clp);
629
630 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
631 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
632 schedule_manager = true;
633 }
634 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
635 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
636 schedule_manager = true;
637 }
638 if (schedule_manager)
639 nfs4_schedule_state_manager(cps->clp);
640
641out:
642 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
643 return status;
644}
645
646/* Reduce the fore channel's max_slots to the target value */
647__be32 nfs4_callback_recallslot(void *argp, void *resp,
648 struct cb_process_state *cps)
649{
650 struct cb_recallslotargs *args = argp;
651 struct nfs4_slot_table *fc_tbl;
652 __be32 status;
653
654 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
655 if (!cps->clp) /* set in cb_sequence */
656 goto out;
657
658 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
659 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
660 args->crsa_target_highest_slotid);
661
662 fc_tbl = &cps->clp->cl_session->fc_slot_table;
663
664 status = htonl(NFS4_OK);
665
666 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
667 nfs41_notify_server(cps->clp);
668out:
669 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
670 return status;
671}
672
673__be32 nfs4_callback_notify_lock(void *argp, void *resp,
674 struct cb_process_state *cps)
675{
676 struct cb_notify_lock_args *args = argp;
677
678 if (!cps->clp) /* set in cb_sequence */
679 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
680
681 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
682 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
683
684 /* Don't wake anybody if the string looked bogus */
685 if (args->cbnl_valid)
686 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
687
688 return htonl(NFS4_OK);
689}
690#endif /* CONFIG_NFS_V4_1 */
691#ifdef CONFIG_NFS_V4_2
692static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
693 struct cb_offloadargs *args)
694{
695 cp_state->count = args->wr_count;
696 cp_state->error = args->error;
697 if (!args->error) {
698 cp_state->verf.committed = args->wr_writeverf.committed;
699 memcpy(&cp_state->verf.verifier.data[0],
700 &args->wr_writeverf.verifier.data[0],
701 NFS4_VERIFIER_SIZE);
702 }
703}
704
705__be32 nfs4_callback_offload(void *data, void *dummy,
706 struct cb_process_state *cps)
707{
708 struct cb_offloadargs *args = data;
709 struct nfs_server *server;
710 struct nfs4_copy_state *copy, *tmp_copy;
711 bool found = false;
712
713 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
714 if (!copy)
715 return htonl(NFS4ERR_SERVERFAULT);
716
717 spin_lock(&cps->clp->cl_lock);
718 rcu_read_lock();
719 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
720 client_link) {
721 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
722 if (memcmp(args->coa_stateid.other,
723 tmp_copy->stateid.other,
724 sizeof(args->coa_stateid.other)))
725 continue;
726 nfs4_copy_cb_args(tmp_copy, args);
727 complete(&tmp_copy->completion);
728 found = true;
729 goto out;
730 }
731 }
732out:
733 rcu_read_unlock();
734 if (!found) {
735 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
736 nfs4_copy_cb_args(copy, args);
737 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
738 } else
739 kfree(copy);
740 spin_unlock(&cps->clp->cl_lock);
741
742 return 0;
743}
744#endif /* CONFIG_NFS_V4_2 */