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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 */
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 memset(res->bitmap, 0, sizeof(res->bitmap));
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->atime = inode_get_atime(inode);
63 res->ctime = inode_get_ctime(inode);
64 res->mtime = inode_get_mtime(inode);
65 res->bitmap[0] = (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE) &
66 args->bitmap[0];
67 res->bitmap[1] = (FATTR4_WORD1_TIME_ACCESS |
68 FATTR4_WORD1_TIME_METADATA |
69 FATTR4_WORD1_TIME_MODIFY) & args->bitmap[1];
70 res->bitmap[2] = (FATTR4_WORD2_TIME_DELEG_ACCESS |
71 FATTR4_WORD2_TIME_DELEG_MODIFY) & args->bitmap[2];
72 res->status = 0;
73out_iput:
74 rcu_read_unlock();
75 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
76 nfs_iput_and_deactive(inode);
77out:
78 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
79 return res->status;
80}
81
82__be32 nfs4_callback_recall(void *argp, void *resp,
83 struct cb_process_state *cps)
84{
85 struct cb_recallargs *args = argp;
86 struct inode *inode;
87 __be32 res;
88
89 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
90 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
91 goto out;
92
93 dprintk_rcu("NFS: RECALL callback request from %s\n",
94 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
95
96 res = htonl(NFS4ERR_BADHANDLE);
97 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
98 if (IS_ERR(inode)) {
99 if (inode == ERR_PTR(-EAGAIN))
100 res = htonl(NFS4ERR_DELAY);
101 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
102 &args->stateid, -ntohl(res));
103 goto out;
104 }
105 /* Set up a helper thread to actually return the delegation */
106 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
107 case 0:
108 res = 0;
109 break;
110 case -ENOENT:
111 res = htonl(NFS4ERR_BAD_STATEID);
112 break;
113 default:
114 res = htonl(NFS4ERR_RESOURCE);
115 }
116 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
117 &args->stateid, -ntohl(res));
118 nfs_iput_and_deactive(inode);
119out:
120 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
121 return res;
122}
123
124#if defined(CONFIG_NFS_V4_1)
125
126/*
127 * Lookup a layout inode by stateid
128 *
129 * Note: returns a refcount on the inode and superblock
130 */
131static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
132 const nfs4_stateid *stateid)
133 __must_hold(RCU)
134{
135 struct nfs_server *server;
136 struct inode *inode;
137 struct pnfs_layout_hdr *lo;
138
139 rcu_read_lock();
140 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
141 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
142 if (!pnfs_layout_is_valid(lo))
143 continue;
144 if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
145 continue;
146 if (nfs_sb_active(server->super))
147 inode = igrab(lo->plh_inode);
148 else
149 inode = ERR_PTR(-EAGAIN);
150 rcu_read_unlock();
151 if (inode)
152 return inode;
153 nfs_sb_deactive(server->super);
154 return ERR_PTR(-EAGAIN);
155 }
156 }
157 rcu_read_unlock();
158 return ERR_PTR(-ENOENT);
159}
160
161/*
162 * Lookup a layout inode by filehandle.
163 *
164 * Note: returns a refcount on the inode and superblock
165 *
166 */
167static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
168 const struct nfs_fh *fh)
169{
170 struct nfs_server *server;
171 struct nfs_inode *nfsi;
172 struct inode *inode;
173 struct pnfs_layout_hdr *lo;
174
175 rcu_read_lock();
176 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
177 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
178 nfsi = NFS_I(lo->plh_inode);
179 if (nfs_compare_fh(fh, &nfsi->fh))
180 continue;
181 if (nfsi->layout != lo)
182 continue;
183 if (nfs_sb_active(server->super))
184 inode = igrab(lo->plh_inode);
185 else
186 inode = ERR_PTR(-EAGAIN);
187 rcu_read_unlock();
188 if (inode)
189 return inode;
190 nfs_sb_deactive(server->super);
191 return ERR_PTR(-EAGAIN);
192 }
193 }
194 rcu_read_unlock();
195 return ERR_PTR(-ENOENT);
196}
197
198static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
199 const struct nfs_fh *fh,
200 const nfs4_stateid *stateid)
201{
202 struct inode *inode;
203
204 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
205 if (inode == ERR_PTR(-ENOENT))
206 inode = nfs_layout_find_inode_by_fh(clp, fh);
207 return inode;
208}
209
210/*
211 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
212 */
213static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
214 const nfs4_stateid *new,
215 struct cb_process_state *cps)
216{
217 u32 oldseq, newseq;
218
219 /* Is the stateid not initialised? */
220 if (!pnfs_layout_is_valid(lo))
221 return NFS4ERR_NOMATCHING_LAYOUT;
222
223 /* Mismatched stateid? */
224 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
225 return NFS4ERR_BAD_STATEID;
226
227 newseq = be32_to_cpu(new->seqid);
228 /* Are we already in a layout recall situation? */
229 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
230 return NFS4ERR_DELAY;
231
232 /*
233 * Check that the stateid matches what we think it should be.
234 * Note that if the server sent us a list of referring calls,
235 * and we know that those have completed, then we trust the
236 * stateid argument is correct.
237 */
238 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
239 if (newseq > oldseq + 1 && !cps->referring_calls)
240 return NFS4ERR_DELAY;
241
242 /* Crazy server! */
243 if (newseq <= oldseq)
244 return NFS4ERR_OLD_STATEID;
245
246 return NFS_OK;
247}
248
249static u32 initiate_file_draining(struct nfs_client *clp,
250 struct cb_layoutrecallargs *args,
251 struct cb_process_state *cps)
252{
253 struct inode *ino;
254 struct pnfs_layout_hdr *lo;
255 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
256 LIST_HEAD(free_me_list);
257
258 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
259 if (IS_ERR(ino)) {
260 if (ino == ERR_PTR(-EAGAIN))
261 rv = NFS4ERR_DELAY;
262 goto out_noput;
263 }
264
265 pnfs_layoutcommit_inode(ino, false);
266
267
268 spin_lock(&ino->i_lock);
269 lo = NFS_I(ino)->layout;
270 if (!lo) {
271 spin_unlock(&ino->i_lock);
272 goto out;
273 }
274 pnfs_get_layout_hdr(lo);
275 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid, cps);
276 if (rv != NFS_OK)
277 goto unlock;
278
279 /*
280 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
281 */
282 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
283 rv = NFS4ERR_DELAY;
284 goto unlock;
285 }
286
287 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
288 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
289 &args->cbl_range,
290 be32_to_cpu(args->cbl_stateid.seqid))) {
291 case 0:
292 case -EBUSY:
293 /* There are layout segments that need to be returned */
294 rv = NFS4_OK;
295 break;
296 case -ENOENT:
297 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
298 /* Embrace your forgetfulness! */
299 rv = NFS4ERR_NOMATCHING_LAYOUT;
300
301 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
302 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
303 &args->cbl_range);
304 }
305 }
306unlock:
307 spin_unlock(&ino->i_lock);
308 pnfs_free_lseg_list(&free_me_list);
309 /* Free all lsegs that are attached to commit buckets */
310 nfs_commit_inode(ino, 0);
311 pnfs_put_layout_hdr(lo);
312out:
313 nfs_iput_and_deactive(ino);
314out_noput:
315 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
316 &args->cbl_stateid, -rv);
317 return rv;
318}
319
320static u32 initiate_bulk_draining(struct nfs_client *clp,
321 struct cb_layoutrecallargs *args)
322{
323 int stat;
324
325 if (args->cbl_recall_type == RETURN_FSID)
326 stat = pnfs_layout_destroy_byfsid(clp, &args->cbl_fsid,
327 PNFS_LAYOUT_BULK_RETURN);
328 else
329 stat = pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_BULK_RETURN);
330 if (stat != 0)
331 return NFS4ERR_DELAY;
332 return NFS4ERR_NOMATCHING_LAYOUT;
333}
334
335static u32 do_callback_layoutrecall(struct nfs_client *clp,
336 struct cb_layoutrecallargs *args,
337 struct cb_process_state *cps)
338{
339 if (args->cbl_recall_type == RETURN_FILE)
340 return initiate_file_draining(clp, args, cps);
341 return initiate_bulk_draining(clp, args);
342}
343
344__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
345 struct cb_process_state *cps)
346{
347 struct cb_layoutrecallargs *args = argp;
348 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
349
350 if (cps->clp)
351 res = do_callback_layoutrecall(cps->clp, args, cps);
352 return cpu_to_be32(res);
353}
354
355static void pnfs_recall_all_layouts(struct nfs_client *clp,
356 struct cb_process_state *cps)
357{
358 struct cb_layoutrecallargs args;
359
360 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
361 memset(&args, 0, sizeof(args));
362 args.cbl_recall_type = RETURN_ALL;
363 /* FIXME we ignore errors, what should we do? */
364 do_callback_layoutrecall(clp, &args, cps);
365}
366
367__be32 nfs4_callback_devicenotify(void *argp, void *resp,
368 struct cb_process_state *cps)
369{
370 struct cb_devicenotifyargs *args = argp;
371 const struct pnfs_layoutdriver_type *ld = NULL;
372 uint32_t i;
373 __be32 res = 0;
374
375 if (!cps->clp) {
376 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
377 goto out;
378 }
379
380 for (i = 0; i < args->ndevs; i++) {
381 struct cb_devicenotifyitem *dev = &args->devs[i];
382
383 if (!ld || ld->id != dev->cbd_layout_type) {
384 pnfs_put_layoutdriver(ld);
385 ld = pnfs_find_layoutdriver(dev->cbd_layout_type);
386 if (!ld)
387 continue;
388 }
389 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id);
390 }
391 pnfs_put_layoutdriver(ld);
392out:
393 kfree(args->devs);
394 return res;
395}
396
397/*
398 * Validate the sequenceID sent by the server.
399 * Return success if the sequenceID is one more than what we last saw on
400 * this slot, accounting for wraparound. Increments the slot's sequence.
401 *
402 * We don't yet implement a duplicate request cache, instead we set the
403 * back channel ca_maxresponsesize_cached to zero. This is OK for now
404 * since we only currently implement idempotent callbacks anyway.
405 *
406 * We have a single slot backchannel at this time, so we don't bother
407 * checking the used_slots bit array on the table. The lower layer guarantees
408 * a single outstanding callback request at a time.
409 */
410static __be32
411validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
412 const struct cb_sequenceargs * args)
413{
414 __be32 ret;
415
416 ret = cpu_to_be32(NFS4ERR_BADSLOT);
417 if (args->csa_slotid > tbl->server_highest_slotid)
418 goto out_err;
419
420 /* Replay */
421 if (args->csa_sequenceid == slot->seq_nr) {
422 ret = cpu_to_be32(NFS4ERR_DELAY);
423 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
424 goto out_err;
425
426 /* Signal process_op to set this error on next op */
427 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
428 if (args->csa_cachethis == 0)
429 goto out_err;
430
431 /* Liar! We never allowed you to set csa_cachethis != 0 */
432 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
433 goto out_err;
434 }
435
436 /* Note: wraparound relies on seq_nr being of type u32 */
437 /* Misordered request */
438 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
439 if (args->csa_sequenceid != slot->seq_nr + 1)
440 goto out_err;
441
442 return cpu_to_be32(NFS4_OK);
443
444out_err:
445 trace_nfs4_cb_seqid_err(args, ret);
446 return ret;
447}
448
449/*
450 * For each referring call triple, check the session's slot table for
451 * a match. If the slot is in use and the sequence numbers match, the
452 * client is still waiting for a response to the original request.
453 */
454static int referring_call_exists(struct nfs_client *clp,
455 uint32_t nrclists,
456 struct referring_call_list *rclists,
457 spinlock_t *lock)
458 __releases(lock)
459 __acquires(lock)
460{
461 int status = 0;
462 int found = 0;
463 int i, j;
464 struct nfs4_session *session;
465 struct nfs4_slot_table *tbl;
466 struct referring_call_list *rclist;
467 struct referring_call *ref;
468
469 /*
470 * XXX When client trunking is implemented, this becomes
471 * a session lookup from within the loop
472 */
473 session = clp->cl_session;
474 tbl = &session->fc_slot_table;
475
476 for (i = 0; i < nrclists; i++) {
477 rclist = &rclists[i];
478 if (memcmp(session->sess_id.data,
479 rclist->rcl_sessionid.data,
480 NFS4_MAX_SESSIONID_LEN) != 0)
481 continue;
482
483 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
484 ref = &rclist->rcl_refcalls[j];
485 spin_unlock(lock);
486 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
487 ref->rc_sequenceid, HZ >> 1) < 0;
488 spin_lock(lock);
489 if (status)
490 goto out;
491 found++;
492 }
493 }
494
495out:
496 return status < 0 ? status : found;
497}
498
499__be32 nfs4_callback_sequence(void *argp, void *resp,
500 struct cb_process_state *cps)
501{
502 struct cb_sequenceargs *args = argp;
503 struct cb_sequenceres *res = resp;
504 struct nfs4_slot_table *tbl;
505 struct nfs4_slot *slot;
506 struct nfs_client *clp;
507 int ret;
508 int i;
509 __be32 status = htonl(NFS4ERR_BADSESSION);
510
511 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
512 &args->csa_sessionid, cps->minorversion);
513 if (clp == NULL)
514 goto out;
515
516 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
517 goto out;
518
519 tbl = &clp->cl_session->bc_slot_table;
520
521 /* Set up res before grabbing the spinlock */
522 memcpy(&res->csr_sessionid, &args->csa_sessionid,
523 sizeof(res->csr_sessionid));
524 res->csr_sequenceid = args->csa_sequenceid;
525 res->csr_slotid = args->csa_slotid;
526
527 spin_lock(&tbl->slot_tbl_lock);
528 /* state manager is resetting the session */
529 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
530 status = htonl(NFS4ERR_DELAY);
531 /* Return NFS4ERR_BADSESSION if we're draining the session
532 * in order to reset it.
533 */
534 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
535 status = htonl(NFS4ERR_BADSESSION);
536 goto out_unlock;
537 }
538
539 status = htonl(NFS4ERR_BADSLOT);
540 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
541 if (IS_ERR(slot))
542 goto out_unlock;
543
544 res->csr_highestslotid = tbl->server_highest_slotid;
545 res->csr_target_highestslotid = tbl->target_highest_slotid;
546
547 status = validate_seqid(tbl, slot, args);
548 if (status)
549 goto out_unlock;
550 if (!nfs4_try_to_lock_slot(tbl, slot)) {
551 status = htonl(NFS4ERR_DELAY);
552 goto out_unlock;
553 }
554 cps->slot = slot;
555
556 /* The ca_maxresponsesize_cached is 0 with no DRC */
557 if (args->csa_cachethis != 0) {
558 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
559 goto out_unlock;
560 }
561
562 /*
563 * Check for pending referring calls. If a match is found, a
564 * related callback was received before the response to the original
565 * call.
566 */
567 ret = referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
568 &tbl->slot_tbl_lock);
569 if (ret < 0) {
570 status = htonl(NFS4ERR_DELAY);
571 goto out_unlock;
572 }
573 cps->referring_calls = ret;
574
575 /*
576 * RFC5661 20.9.3
577 * If CB_SEQUENCE returns an error, then the state of the slot
578 * (sequence ID, cached reply) MUST NOT change.
579 */
580 slot->seq_nr = args->csa_sequenceid;
581out_unlock:
582 spin_unlock(&tbl->slot_tbl_lock);
583
584out:
585 cps->clp = clp; /* put in nfs4_callback_compound */
586 for (i = 0; i < args->csa_nrclists; i++)
587 kfree(args->csa_rclists[i].rcl_refcalls);
588 kfree(args->csa_rclists);
589
590 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
591 cps->drc_status = status;
592 status = 0;
593 } else
594 res->csr_status = status;
595
596 trace_nfs4_cb_sequence(args, res, status);
597 return status;
598}
599
600static bool
601validate_bitmap_values(unsigned int mask)
602{
603 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
604}
605
606__be32 nfs4_callback_recallany(void *argp, void *resp,
607 struct cb_process_state *cps)
608{
609 struct cb_recallanyargs *args = argp;
610 __be32 status;
611 fmode_t flags = 0;
612 bool schedule_manager = false;
613
614 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
615 if (!cps->clp) /* set in cb_sequence */
616 goto out;
617
618 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
619 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
620
621 status = cpu_to_be32(NFS4ERR_INVAL);
622 if (!validate_bitmap_values(args->craa_type_mask))
623 goto out;
624
625 status = cpu_to_be32(NFS4_OK);
626 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
627 flags = FMODE_READ;
628 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
629 flags |= FMODE_WRITE;
630 if (flags)
631 nfs_expire_unused_delegation_types(cps->clp, flags);
632
633 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
634 pnfs_recall_all_layouts(cps->clp, cps);
635
636 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
637 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
638 schedule_manager = true;
639 }
640 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
641 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
642 schedule_manager = true;
643 }
644 if (schedule_manager)
645 nfs4_schedule_state_manager(cps->clp);
646
647out:
648 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
649 return status;
650}
651
652/* Reduce the fore channel's max_slots to the target value */
653__be32 nfs4_callback_recallslot(void *argp, void *resp,
654 struct cb_process_state *cps)
655{
656 struct cb_recallslotargs *args = argp;
657 struct nfs4_slot_table *fc_tbl;
658 __be32 status;
659
660 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
661 if (!cps->clp) /* set in cb_sequence */
662 goto out;
663
664 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
665 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
666 args->crsa_target_highest_slotid);
667
668 fc_tbl = &cps->clp->cl_session->fc_slot_table;
669
670 status = htonl(NFS4_OK);
671
672 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
673 nfs41_notify_server(cps->clp);
674out:
675 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
676 return status;
677}
678
679__be32 nfs4_callback_notify_lock(void *argp, void *resp,
680 struct cb_process_state *cps)
681{
682 struct cb_notify_lock_args *args = argp;
683
684 if (!cps->clp) /* set in cb_sequence */
685 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
686
687 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
688 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
689
690 /* Don't wake anybody if the string looked bogus */
691 if (args->cbnl_valid)
692 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
693
694 return htonl(NFS4_OK);
695}
696#endif /* CONFIG_NFS_V4_1 */
697#ifdef CONFIG_NFS_V4_2
698static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
699 struct cb_offloadargs *args)
700{
701 cp_state->count = args->wr_count;
702 cp_state->error = args->error;
703 if (!args->error) {
704 cp_state->verf.committed = args->wr_writeverf.committed;
705 memcpy(&cp_state->verf.verifier.data[0],
706 &args->wr_writeverf.verifier.data[0],
707 NFS4_VERIFIER_SIZE);
708 }
709}
710
711__be32 nfs4_callback_offload(void *data, void *dummy,
712 struct cb_process_state *cps)
713{
714 struct cb_offloadargs *args = data;
715 struct nfs_server *server;
716 struct nfs4_copy_state *copy, *tmp_copy;
717 bool found = false;
718
719 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
720 if (!copy)
721 return htonl(NFS4ERR_SERVERFAULT);
722
723 spin_lock(&cps->clp->cl_lock);
724 rcu_read_lock();
725 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
726 client_link) {
727 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
728 if (memcmp(args->coa_stateid.other,
729 tmp_copy->stateid.other,
730 sizeof(args->coa_stateid.other)))
731 continue;
732 nfs4_copy_cb_args(tmp_copy, args);
733 complete(&tmp_copy->completion);
734 found = true;
735 goto out;
736 }
737 }
738out:
739 rcu_read_unlock();
740 if (!found) {
741 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
742 nfs4_copy_cb_args(copy, args);
743 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
744 } else
745 kfree(copy);
746 spin_unlock(&cps->clp->cl_lock);
747
748 trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid,
749 args->wr_count, args->error,
750 args->wr_writeverf.committed);
751 return 0;
752}
753#endif /* CONFIG_NFS_V4_2 */