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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 inode *inode;
30
31 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
32 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
33 goto out;
34
35 res->bitmap[0] = res->bitmap[1] = 0;
36 res->status = htonl(NFS4ERR_BADHANDLE);
37
38 dprintk_rcu("NFS: GETATTR callback request from %s\n",
39 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
40
41 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
42 if (IS_ERR(inode)) {
43 if (inode == ERR_PTR(-EAGAIN))
44 res->status = htonl(NFS4ERR_DELAY);
45 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
46 -ntohl(res->status));
47 goto out;
48 }
49 rcu_read_lock();
50 delegation = nfs4_get_valid_delegation(inode);
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 nfs_iput_and_deactive(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 (IS_ERR(inode)) {
90 if (inode == ERR_PTR(-EAGAIN))
91 res = htonl(NFS4ERR_DELAY);
92 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
93 &args->stateid, -ntohl(res));
94 goto out;
95 }
96 /* Set up a helper thread to actually return the delegation */
97 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
98 case 0:
99 res = 0;
100 break;
101 case -ENOENT:
102 res = htonl(NFS4ERR_BAD_STATEID);
103 break;
104 default:
105 res = htonl(NFS4ERR_RESOURCE);
106 }
107 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
108 &args->stateid, -ntohl(res));
109 nfs_iput_and_deactive(inode);
110out:
111 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
112 return res;
113}
114
115#if defined(CONFIG_NFS_V4_1)
116
117/*
118 * Lookup a layout inode by stateid
119 *
120 * Note: returns a refcount on the inode and superblock
121 */
122static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
123 const nfs4_stateid *stateid)
124 __must_hold(RCU)
125{
126 struct nfs_server *server;
127 struct inode *inode;
128 struct pnfs_layout_hdr *lo;
129
130 rcu_read_lock();
131 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
132 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
133 if (!pnfs_layout_is_valid(lo))
134 continue;
135 if (stateid != NULL &&
136 !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
137 continue;
138 if (!nfs_sb_active(server->super))
139 continue;
140 inode = igrab(lo->plh_inode);
141 rcu_read_unlock();
142 if (inode)
143 return inode;
144 nfs_sb_deactive(server->super);
145 return ERR_PTR(-EAGAIN);
146 }
147 }
148 rcu_read_unlock();
149 return ERR_PTR(-ENOENT);
150}
151
152/*
153 * Lookup a layout inode by filehandle.
154 *
155 * Note: returns a refcount on the inode and superblock
156 *
157 */
158static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
159 const struct nfs_fh *fh)
160{
161 struct nfs_server *server;
162 struct nfs_inode *nfsi;
163 struct inode *inode;
164 struct pnfs_layout_hdr *lo;
165
166 rcu_read_lock();
167 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
168 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
169 nfsi = NFS_I(lo->plh_inode);
170 if (nfs_compare_fh(fh, &nfsi->fh))
171 continue;
172 if (nfsi->layout != lo)
173 continue;
174 if (!nfs_sb_active(server->super))
175 continue;
176 inode = igrab(lo->plh_inode);
177 rcu_read_unlock();
178 if (inode)
179 return inode;
180 nfs_sb_deactive(server->super);
181 return ERR_PTR(-EAGAIN);
182 }
183 }
184 rcu_read_unlock();
185 return ERR_PTR(-ENOENT);
186}
187
188static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
189 const struct nfs_fh *fh,
190 const nfs4_stateid *stateid)
191{
192 struct inode *inode;
193
194 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
195 if (inode == ERR_PTR(-ENOENT))
196 inode = nfs_layout_find_inode_by_fh(clp, fh);
197 return inode;
198}
199
200/*
201 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
202 */
203static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
204 const nfs4_stateid *new)
205{
206 u32 oldseq, newseq;
207
208 /* Is the stateid not initialised? */
209 if (!pnfs_layout_is_valid(lo))
210 return NFS4ERR_NOMATCHING_LAYOUT;
211
212 /* Mismatched stateid? */
213 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
214 return NFS4ERR_BAD_STATEID;
215
216 newseq = be32_to_cpu(new->seqid);
217 /* Are we already in a layout recall situation? */
218 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
219 lo->plh_return_seq != 0) {
220 if (newseq < lo->plh_return_seq)
221 return NFS4ERR_OLD_STATEID;
222 if (newseq > lo->plh_return_seq)
223 return NFS4ERR_DELAY;
224 goto out;
225 }
226
227 /* Check that the stateid matches what we think it should be. */
228 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
229 if (newseq > oldseq + 1)
230 return NFS4ERR_DELAY;
231 /* Crazy server! */
232 if (newseq <= oldseq)
233 return NFS4ERR_OLD_STATEID;
234out:
235 return NFS_OK;
236}
237
238static u32 initiate_file_draining(struct nfs_client *clp,
239 struct cb_layoutrecallargs *args)
240{
241 struct inode *ino;
242 struct pnfs_layout_hdr *lo;
243 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
244 LIST_HEAD(free_me_list);
245
246 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
247 if (IS_ERR(ino)) {
248 if (ino == ERR_PTR(-EAGAIN))
249 rv = NFS4ERR_DELAY;
250 goto out_noput;
251 }
252
253 pnfs_layoutcommit_inode(ino, false);
254
255
256 spin_lock(&ino->i_lock);
257 lo = NFS_I(ino)->layout;
258 if (!lo) {
259 spin_unlock(&ino->i_lock);
260 goto out;
261 }
262 pnfs_get_layout_hdr(lo);
263 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
264 if (rv != NFS_OK)
265 goto unlock;
266
267 /*
268 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
269 */
270 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
271 rv = NFS4ERR_DELAY;
272 goto unlock;
273 }
274
275 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
276 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
277 &args->cbl_range,
278 be32_to_cpu(args->cbl_stateid.seqid))) {
279 case 0:
280 case -EBUSY:
281 /* There are layout segments that need to be returned */
282 rv = NFS4_OK;
283 break;
284 case -ENOENT:
285 /* Embrace your forgetfulness! */
286 rv = NFS4ERR_NOMATCHING_LAYOUT;
287
288 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
289 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
290 &args->cbl_range);
291 }
292 }
293unlock:
294 spin_unlock(&ino->i_lock);
295 pnfs_free_lseg_list(&free_me_list);
296 /* Free all lsegs that are attached to commit buckets */
297 nfs_commit_inode(ino, 0);
298 pnfs_put_layout_hdr(lo);
299out:
300 nfs_iput_and_deactive(ino);
301out_noput:
302 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
303 &args->cbl_stateid, -rv);
304 return rv;
305}
306
307static u32 initiate_bulk_draining(struct nfs_client *clp,
308 struct cb_layoutrecallargs *args)
309{
310 int stat;
311
312 if (args->cbl_recall_type == RETURN_FSID)
313 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
314 else
315 stat = pnfs_destroy_layouts_byclid(clp, true);
316 if (stat != 0)
317 return NFS4ERR_DELAY;
318 return NFS4ERR_NOMATCHING_LAYOUT;
319}
320
321static u32 do_callback_layoutrecall(struct nfs_client *clp,
322 struct cb_layoutrecallargs *args)
323{
324 if (args->cbl_recall_type == RETURN_FILE)
325 return initiate_file_draining(clp, args);
326 return initiate_bulk_draining(clp, args);
327}
328
329__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
330 struct cb_process_state *cps)
331{
332 struct cb_layoutrecallargs *args = argp;
333 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
334
335 if (cps->clp)
336 res = do_callback_layoutrecall(cps->clp, args);
337 return cpu_to_be32(res);
338}
339
340static void pnfs_recall_all_layouts(struct nfs_client *clp)
341{
342 struct cb_layoutrecallargs args;
343
344 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
345 memset(&args, 0, sizeof(args));
346 args.cbl_recall_type = RETURN_ALL;
347 /* FIXME we ignore errors, what should we do? */
348 do_callback_layoutrecall(clp, &args);
349}
350
351__be32 nfs4_callback_devicenotify(void *argp, void *resp,
352 struct cb_process_state *cps)
353{
354 struct cb_devicenotifyargs *args = argp;
355 int i;
356 __be32 res = 0;
357 struct nfs_client *clp = cps->clp;
358 struct nfs_server *server = NULL;
359
360 if (!clp) {
361 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
362 goto out;
363 }
364
365 for (i = 0; i < args->ndevs; i++) {
366 struct cb_devicenotifyitem *dev = &args->devs[i];
367
368 if (!server ||
369 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
370 rcu_read_lock();
371 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
372 if (server->pnfs_curr_ld &&
373 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
374 rcu_read_unlock();
375 goto found;
376 }
377 rcu_read_unlock();
378 continue;
379 }
380
381 found:
382 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
383 }
384
385out:
386 kfree(args->devs);
387 return res;
388}
389
390/*
391 * Validate the sequenceID sent by the server.
392 * Return success if the sequenceID is one more than what we last saw on
393 * this slot, accounting for wraparound. Increments the slot's sequence.
394 *
395 * We don't yet implement a duplicate request cache, instead we set the
396 * back channel ca_maxresponsesize_cached to zero. This is OK for now
397 * since we only currently implement idempotent callbacks anyway.
398 *
399 * We have a single slot backchannel at this time, so we don't bother
400 * checking the used_slots bit array on the table. The lower layer guarantees
401 * a single outstanding callback request at a time.
402 */
403static __be32
404validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
405 const struct cb_sequenceargs * args)
406{
407 __be32 ret;
408
409 ret = cpu_to_be32(NFS4ERR_BADSLOT);
410 if (args->csa_slotid > tbl->server_highest_slotid)
411 goto out_err;
412
413 /* Replay */
414 if (args->csa_sequenceid == slot->seq_nr) {
415 ret = cpu_to_be32(NFS4ERR_DELAY);
416 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
417 goto out_err;
418
419 /* Signal process_op to set this error on next op */
420 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
421 if (args->csa_cachethis == 0)
422 goto out_err;
423
424 /* Liar! We never allowed you to set csa_cachethis != 0 */
425 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
426 goto out_err;
427 }
428
429 /* Note: wraparound relies on seq_nr being of type u32 */
430 /* Misordered request */
431 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
432 if (args->csa_sequenceid != slot->seq_nr + 1)
433 goto out_err;
434
435 return cpu_to_be32(NFS4_OK);
436
437out_err:
438 trace_nfs4_cb_seqid_err(args, ret);
439 return ret;
440}
441
442/*
443 * For each referring call triple, check the session's slot table for
444 * a match. If the slot is in use and the sequence numbers match, the
445 * client is still waiting for a response to the original request.
446 */
447static int referring_call_exists(struct nfs_client *clp,
448 uint32_t nrclists,
449 struct referring_call_list *rclists,
450 spinlock_t *lock)
451 __releases(lock)
452 __acquires(lock)
453{
454 int status = 0;
455 int i, j;
456 struct nfs4_session *session;
457 struct nfs4_slot_table *tbl;
458 struct referring_call_list *rclist;
459 struct referring_call *ref;
460
461 /*
462 * XXX When client trunking is implemented, this becomes
463 * a session lookup from within the loop
464 */
465 session = clp->cl_session;
466 tbl = &session->fc_slot_table;
467
468 for (i = 0; i < nrclists; i++) {
469 rclist = &rclists[i];
470 if (memcmp(session->sess_id.data,
471 rclist->rcl_sessionid.data,
472 NFS4_MAX_SESSIONID_LEN) != 0)
473 continue;
474
475 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
476 ref = &rclist->rcl_refcalls[j];
477 spin_unlock(lock);
478 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
479 ref->rc_sequenceid, HZ >> 1) < 0;
480 spin_lock(lock);
481 if (status)
482 goto out;
483 }
484 }
485
486out:
487 return status;
488}
489
490__be32 nfs4_callback_sequence(void *argp, void *resp,
491 struct cb_process_state *cps)
492{
493 struct cb_sequenceargs *args = argp;
494 struct cb_sequenceres *res = resp;
495 struct nfs4_slot_table *tbl;
496 struct nfs4_slot *slot;
497 struct nfs_client *clp;
498 int i;
499 __be32 status = htonl(NFS4ERR_BADSESSION);
500
501 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
502 &args->csa_sessionid, cps->minorversion);
503 if (clp == NULL)
504 goto out;
505
506 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
507 goto out;
508
509 tbl = &clp->cl_session->bc_slot_table;
510
511 /* Set up res before grabbing the spinlock */
512 memcpy(&res->csr_sessionid, &args->csa_sessionid,
513 sizeof(res->csr_sessionid));
514 res->csr_sequenceid = args->csa_sequenceid;
515 res->csr_slotid = args->csa_slotid;
516
517 spin_lock(&tbl->slot_tbl_lock);
518 /* state manager is resetting the session */
519 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
520 status = htonl(NFS4ERR_DELAY);
521 /* Return NFS4ERR_BADSESSION if we're draining the session
522 * in order to reset it.
523 */
524 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
525 status = htonl(NFS4ERR_BADSESSION);
526 goto out_unlock;
527 }
528
529 status = htonl(NFS4ERR_BADSLOT);
530 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
531 if (IS_ERR(slot))
532 goto out_unlock;
533
534 res->csr_highestslotid = tbl->server_highest_slotid;
535 res->csr_target_highestslotid = tbl->target_highest_slotid;
536
537 status = validate_seqid(tbl, slot, args);
538 if (status)
539 goto out_unlock;
540 if (!nfs4_try_to_lock_slot(tbl, slot)) {
541 status = htonl(NFS4ERR_DELAY);
542 goto out_unlock;
543 }
544 cps->slot = slot;
545
546 /* The ca_maxresponsesize_cached is 0 with no DRC */
547 if (args->csa_cachethis != 0) {
548 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
549 goto out_unlock;
550 }
551
552 /*
553 * Check for pending referring calls. If a match is found, a
554 * related callback was received before the response to the original
555 * call.
556 */
557 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
558 &tbl->slot_tbl_lock) < 0) {
559 status = htonl(NFS4ERR_DELAY);
560 goto out_unlock;
561 }
562
563 /*
564 * RFC5661 20.9.3
565 * If CB_SEQUENCE returns an error, then the state of the slot
566 * (sequence ID, cached reply) MUST NOT change.
567 */
568 slot->seq_nr = args->csa_sequenceid;
569out_unlock:
570 spin_unlock(&tbl->slot_tbl_lock);
571
572out:
573 cps->clp = clp; /* put in nfs4_callback_compound */
574 for (i = 0; i < args->csa_nrclists; i++)
575 kfree(args->csa_rclists[i].rcl_refcalls);
576 kfree(args->csa_rclists);
577
578 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
579 cps->drc_status = status;
580 status = 0;
581 } else
582 res->csr_status = status;
583
584 trace_nfs4_cb_sequence(args, res, status);
585 return status;
586}
587
588static bool
589validate_bitmap_values(unsigned int mask)
590{
591 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
592}
593
594__be32 nfs4_callback_recallany(void *argp, void *resp,
595 struct cb_process_state *cps)
596{
597 struct cb_recallanyargs *args = argp;
598 __be32 status;
599 fmode_t flags = 0;
600 bool schedule_manager = false;
601
602 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
603 if (!cps->clp) /* set in cb_sequence */
604 goto out;
605
606 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
607 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
608
609 status = cpu_to_be32(NFS4ERR_INVAL);
610 if (!validate_bitmap_values(args->craa_type_mask))
611 goto out;
612
613 status = cpu_to_be32(NFS4_OK);
614 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
615 flags = FMODE_READ;
616 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
617 flags |= FMODE_WRITE;
618 if (flags)
619 nfs_expire_unused_delegation_types(cps->clp, flags);
620
621 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
622 pnfs_recall_all_layouts(cps->clp);
623
624 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
625 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
626 schedule_manager = true;
627 }
628 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
629 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
630 schedule_manager = true;
631 }
632 if (schedule_manager)
633 nfs4_schedule_state_manager(cps->clp);
634
635out:
636 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
637 return status;
638}
639
640/* Reduce the fore channel's max_slots to the target value */
641__be32 nfs4_callback_recallslot(void *argp, void *resp,
642 struct cb_process_state *cps)
643{
644 struct cb_recallslotargs *args = argp;
645 struct nfs4_slot_table *fc_tbl;
646 __be32 status;
647
648 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
649 if (!cps->clp) /* set in cb_sequence */
650 goto out;
651
652 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
653 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
654 args->crsa_target_highest_slotid);
655
656 fc_tbl = &cps->clp->cl_session->fc_slot_table;
657
658 status = htonl(NFS4_OK);
659
660 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
661 nfs41_notify_server(cps->clp);
662out:
663 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
664 return status;
665}
666
667__be32 nfs4_callback_notify_lock(void *argp, void *resp,
668 struct cb_process_state *cps)
669{
670 struct cb_notify_lock_args *args = argp;
671
672 if (!cps->clp) /* set in cb_sequence */
673 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
674
675 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
676 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
677
678 /* Don't wake anybody if the string looked bogus */
679 if (args->cbnl_valid)
680 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
681
682 return htonl(NFS4_OK);
683}
684#endif /* CONFIG_NFS_V4_1 */
685#ifdef CONFIG_NFS_V4_2
686static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
687 struct cb_offloadargs *args)
688{
689 cp_state->count = args->wr_count;
690 cp_state->error = args->error;
691 if (!args->error) {
692 cp_state->verf.committed = args->wr_writeverf.committed;
693 memcpy(&cp_state->verf.verifier.data[0],
694 &args->wr_writeverf.verifier.data[0],
695 NFS4_VERIFIER_SIZE);
696 }
697}
698
699__be32 nfs4_callback_offload(void *data, void *dummy,
700 struct cb_process_state *cps)
701{
702 struct cb_offloadargs *args = data;
703 struct nfs_server *server;
704 struct nfs4_copy_state *copy, *tmp_copy;
705 bool found = false;
706
707 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
708 if (!copy)
709 return htonl(NFS4ERR_SERVERFAULT);
710
711 spin_lock(&cps->clp->cl_lock);
712 rcu_read_lock();
713 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
714 client_link) {
715 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
716 if (memcmp(args->coa_stateid.other,
717 tmp_copy->stateid.other,
718 sizeof(args->coa_stateid.other)))
719 continue;
720 nfs4_copy_cb_args(tmp_copy, args);
721 complete(&tmp_copy->completion);
722 found = true;
723 goto out;
724 }
725 }
726out:
727 rcu_read_unlock();
728 if (!found) {
729 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
730 nfs4_copy_cb_args(copy, args);
731 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
732 } else
733 kfree(copy);
734 spin_unlock(&cps->clp->cl_lock);
735
736 return 0;
737}
738#endif /* CONFIG_NFS_V4_2 */
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 (IS_ERR(inode)) {
44 if (inode == ERR_PTR(-EAGAIN))
45 res->status = htonl(NFS4ERR_DELAY);
46 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
47 -ntohl(res->status));
48 goto out;
49 }
50 nfsi = NFS_I(inode);
51 rcu_read_lock();
52 delegation = rcu_dereference(nfsi->delegation);
53 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
54 goto out_iput;
55 res->size = i_size_read(inode);
56 res->change_attr = delegation->change_attr;
57 if (nfs_have_writebacks(inode))
58 res->change_attr++;
59 res->ctime = timespec64_to_timespec(inode->i_ctime);
60 res->mtime = timespec64_to_timespec(inode->i_mtime);
61 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
62 args->bitmap[0];
63 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
64 args->bitmap[1];
65 res->status = 0;
66out_iput:
67 rcu_read_unlock();
68 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
69 nfs_iput_and_deactive(inode);
70out:
71 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
72 return res->status;
73}
74
75__be32 nfs4_callback_recall(void *argp, void *resp,
76 struct cb_process_state *cps)
77{
78 struct cb_recallargs *args = argp;
79 struct inode *inode;
80 __be32 res;
81
82 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
83 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
84 goto out;
85
86 dprintk_rcu("NFS: RECALL callback request from %s\n",
87 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
88
89 res = htonl(NFS4ERR_BADHANDLE);
90 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
91 if (IS_ERR(inode)) {
92 if (inode == ERR_PTR(-EAGAIN))
93 res = htonl(NFS4ERR_DELAY);
94 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
95 &args->stateid, -ntohl(res));
96 goto out;
97 }
98 /* Set up a helper thread to actually return the delegation */
99 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
100 case 0:
101 res = 0;
102 break;
103 case -ENOENT:
104 res = htonl(NFS4ERR_BAD_STATEID);
105 break;
106 default:
107 res = htonl(NFS4ERR_RESOURCE);
108 }
109 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
110 &args->stateid, -ntohl(res));
111 nfs_iput_and_deactive(inode);
112out:
113 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
114 return res;
115}
116
117#if defined(CONFIG_NFS_V4_1)
118
119/*
120 * Lookup a layout inode by stateid
121 *
122 * Note: returns a refcount on the inode and superblock
123 */
124static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
125 const nfs4_stateid *stateid)
126{
127 struct nfs_server *server;
128 struct inode *inode;
129 struct pnfs_layout_hdr *lo;
130
131 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
132 list_for_each_entry(lo, &server->layouts, plh_layouts) {
133 if (stateid != NULL &&
134 !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
135 continue;
136 inode = igrab(lo->plh_inode);
137 if (!inode)
138 return ERR_PTR(-EAGAIN);
139 if (!nfs_sb_active(inode->i_sb)) {
140 rcu_read_unlock();
141 spin_unlock(&clp->cl_lock);
142 iput(inode);
143 spin_lock(&clp->cl_lock);
144 rcu_read_lock();
145 return ERR_PTR(-EAGAIN);
146 }
147 return inode;
148 }
149 }
150
151 return ERR_PTR(-ENOENT);
152}
153
154/*
155 * Lookup a layout inode by filehandle.
156 *
157 * Note: returns a refcount on the inode and superblock
158 *
159 */
160static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
161 const struct nfs_fh *fh)
162{
163 struct nfs_server *server;
164 struct nfs_inode *nfsi;
165 struct inode *inode;
166 struct pnfs_layout_hdr *lo;
167
168 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
169 list_for_each_entry(lo, &server->layouts, plh_layouts) {
170 nfsi = NFS_I(lo->plh_inode);
171 if (nfs_compare_fh(fh, &nfsi->fh))
172 continue;
173 if (nfsi->layout != lo)
174 continue;
175 inode = igrab(lo->plh_inode);
176 if (!inode)
177 return ERR_PTR(-EAGAIN);
178 if (!nfs_sb_active(inode->i_sb)) {
179 rcu_read_unlock();
180 spin_unlock(&clp->cl_lock);
181 iput(inode);
182 spin_lock(&clp->cl_lock);
183 rcu_read_lock();
184 return ERR_PTR(-EAGAIN);
185 }
186 return inode;
187 }
188 }
189
190 return ERR_PTR(-ENOENT);
191}
192
193static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
194 const struct nfs_fh *fh,
195 const nfs4_stateid *stateid)
196{
197 struct inode *inode;
198
199 spin_lock(&clp->cl_lock);
200 rcu_read_lock();
201 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
202 if (inode == ERR_PTR(-ENOENT))
203 inode = nfs_layout_find_inode_by_fh(clp, fh);
204 rcu_read_unlock();
205 spin_unlock(&clp->cl_lock);
206
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{
216 u32 oldseq, newseq;
217
218 /* Is the stateid not initialised? */
219 if (!pnfs_layout_is_valid(lo))
220 return NFS4ERR_NOMATCHING_LAYOUT;
221
222 /* Mismatched stateid? */
223 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
224 return NFS4ERR_BAD_STATEID;
225
226 newseq = be32_to_cpu(new->seqid);
227 /* Are we already in a layout recall situation? */
228 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
229 lo->plh_return_seq != 0) {
230 if (newseq < lo->plh_return_seq)
231 return NFS4ERR_OLD_STATEID;
232 if (newseq > lo->plh_return_seq)
233 return NFS4ERR_DELAY;
234 goto out;
235 }
236
237 /* Check that the stateid matches what we think it should be. */
238 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
239 if (newseq > oldseq + 1)
240 return NFS4ERR_DELAY;
241 /* Crazy server! */
242 if (newseq <= oldseq)
243 return NFS4ERR_OLD_STATEID;
244out:
245 return NFS_OK;
246}
247
248static u32 initiate_file_draining(struct nfs_client *clp,
249 struct cb_layoutrecallargs *args)
250{
251 struct inode *ino;
252 struct pnfs_layout_hdr *lo;
253 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
254 LIST_HEAD(free_me_list);
255
256 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
257 if (IS_ERR(ino)) {
258 if (ino == ERR_PTR(-EAGAIN))
259 rv = NFS4ERR_DELAY;
260 goto out_noput;
261 }
262
263 pnfs_layoutcommit_inode(ino, false);
264
265
266 spin_lock(&ino->i_lock);
267 lo = NFS_I(ino)->layout;
268 if (!lo) {
269 spin_unlock(&ino->i_lock);
270 goto out;
271 }
272 pnfs_get_layout_hdr(lo);
273 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
274 if (rv != NFS_OK)
275 goto unlock;
276
277 /*
278 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
279 */
280 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
281 rv = NFS4ERR_DELAY;
282 goto unlock;
283 }
284
285 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
286 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
287 &args->cbl_range,
288 be32_to_cpu(args->cbl_stateid.seqid))) {
289 case 0:
290 case -EBUSY:
291 /* There are layout segments that need to be returned */
292 rv = NFS4_OK;
293 break;
294 case -ENOENT:
295 /* Embrace your forgetfulness! */
296 rv = NFS4ERR_NOMATCHING_LAYOUT;
297
298 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
299 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
300 &args->cbl_range);
301 }
302 }
303unlock:
304 spin_unlock(&ino->i_lock);
305 pnfs_free_lseg_list(&free_me_list);
306 /* Free all lsegs that are attached to commit buckets */
307 nfs_commit_inode(ino, 0);
308 pnfs_put_layout_hdr(lo);
309out:
310 nfs_iput_and_deactive(ino);
311out_noput:
312 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
313 &args->cbl_stateid, -rv);
314 return rv;
315}
316
317static u32 initiate_bulk_draining(struct nfs_client *clp,
318 struct cb_layoutrecallargs *args)
319{
320 int stat;
321
322 if (args->cbl_recall_type == RETURN_FSID)
323 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
324 else
325 stat = pnfs_destroy_layouts_byclid(clp, true);
326 if (stat != 0)
327 return NFS4ERR_DELAY;
328 return NFS4ERR_NOMATCHING_LAYOUT;
329}
330
331static u32 do_callback_layoutrecall(struct nfs_client *clp,
332 struct cb_layoutrecallargs *args)
333{
334 if (args->cbl_recall_type == RETURN_FILE)
335 return initiate_file_draining(clp, args);
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);
347 return cpu_to_be32(res);
348}
349
350static void pnfs_recall_all_layouts(struct nfs_client *clp)
351{
352 struct cb_layoutrecallargs args;
353
354 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
355 memset(&args, 0, sizeof(args));
356 args.cbl_recall_type = RETURN_ALL;
357 /* FIXME we ignore errors, what should we do? */
358 do_callback_layoutrecall(clp, &args);
359}
360
361__be32 nfs4_callback_devicenotify(void *argp, void *resp,
362 struct cb_process_state *cps)
363{
364 struct cb_devicenotifyargs *args = argp;
365 int i;
366 __be32 res = 0;
367 struct nfs_client *clp = cps->clp;
368 struct nfs_server *server = NULL;
369
370 if (!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 (!server ||
379 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
380 rcu_read_lock();
381 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
382 if (server->pnfs_curr_ld &&
383 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
384 rcu_read_unlock();
385 goto found;
386 }
387 rcu_read_unlock();
388 continue;
389 }
390
391 found:
392 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
393 }
394
395out:
396 kfree(args->devs);
397 return res;
398}
399
400/*
401 * Validate the sequenceID sent by the server.
402 * Return success if the sequenceID is one more than what we last saw on
403 * this slot, accounting for wraparound. Increments the slot's sequence.
404 *
405 * We don't yet implement a duplicate request cache, instead we set the
406 * back channel ca_maxresponsesize_cached to zero. This is OK for now
407 * since we only currently implement idempotent callbacks anyway.
408 *
409 * We have a single slot backchannel at this time, so we don't bother
410 * checking the used_slots bit array on the table. The lower layer guarantees
411 * a single outstanding callback request at a time.
412 */
413static __be32
414validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
415 const struct cb_sequenceargs * args)
416{
417 __be32 ret;
418
419 ret = cpu_to_be32(NFS4ERR_BADSLOT);
420 if (args->csa_slotid > tbl->server_highest_slotid)
421 goto out_err;
422
423 /* Replay */
424 if (args->csa_sequenceid == slot->seq_nr) {
425 ret = cpu_to_be32(NFS4ERR_DELAY);
426 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
427 goto out_err;
428
429 /* Signal process_op to set this error on next op */
430 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
431 if (args->csa_cachethis == 0)
432 goto out_err;
433
434 /* Liar! We never allowed you to set csa_cachethis != 0 */
435 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
436 goto out_err;
437 }
438
439 /* Note: wraparound relies on seq_nr being of type u32 */
440 /* Misordered request */
441 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
442 if (args->csa_sequenceid != slot->seq_nr + 1)
443 goto out_err;
444
445 return cpu_to_be32(NFS4_OK);
446
447out_err:
448 trace_nfs4_cb_seqid_err(args, ret);
449 return ret;
450}
451
452/*
453 * For each referring call triple, check the session's slot table for
454 * a match. If the slot is in use and the sequence numbers match, the
455 * client is still waiting for a response to the original request.
456 */
457static int referring_call_exists(struct nfs_client *clp,
458 uint32_t nrclists,
459 struct referring_call_list *rclists,
460 spinlock_t *lock)
461 __releases(lock)
462 __acquires(lock)
463{
464 int status = 0;
465 int i, j;
466 struct nfs4_session *session;
467 struct nfs4_slot_table *tbl;
468 struct referring_call_list *rclist;
469 struct referring_call *ref;
470
471 /*
472 * XXX When client trunking is implemented, this becomes
473 * a session lookup from within the loop
474 */
475 session = clp->cl_session;
476 tbl = &session->fc_slot_table;
477
478 for (i = 0; i < nrclists; i++) {
479 rclist = &rclists[i];
480 if (memcmp(session->sess_id.data,
481 rclist->rcl_sessionid.data,
482 NFS4_MAX_SESSIONID_LEN) != 0)
483 continue;
484
485 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
486 ref = &rclist->rcl_refcalls[j];
487 spin_unlock(lock);
488 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
489 ref->rc_sequenceid, HZ >> 1) < 0;
490 spin_lock(lock);
491 if (status)
492 goto out;
493 }
494 }
495
496out:
497 return status;
498}
499
500__be32 nfs4_callback_sequence(void *argp, void *resp,
501 struct cb_process_state *cps)
502{
503 struct cb_sequenceargs *args = argp;
504 struct cb_sequenceres *res = resp;
505 struct nfs4_slot_table *tbl;
506 struct nfs4_slot *slot;
507 struct nfs_client *clp;
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 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
568 &tbl->slot_tbl_lock) < 0) {
569 status = htonl(NFS4ERR_DELAY);
570 goto out_unlock;
571 }
572
573 /*
574 * RFC5661 20.9.3
575 * If CB_SEQUENCE returns an error, then the state of the slot
576 * (sequence ID, cached reply) MUST NOT change.
577 */
578 slot->seq_nr = args->csa_sequenceid;
579out_unlock:
580 spin_unlock(&tbl->slot_tbl_lock);
581
582out:
583 cps->clp = clp; /* put in nfs4_callback_compound */
584 for (i = 0; i < args->csa_nrclists; i++)
585 kfree(args->csa_rclists[i].rcl_refcalls);
586 kfree(args->csa_rclists);
587
588 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
589 cps->drc_status = status;
590 status = 0;
591 } else
592 res->csr_status = status;
593
594 trace_nfs4_cb_sequence(args, res, status);
595 return status;
596}
597
598static bool
599validate_bitmap_values(unsigned int mask)
600{
601 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
602}
603
604__be32 nfs4_callback_recallany(void *argp, void *resp,
605 struct cb_process_state *cps)
606{
607 struct cb_recallanyargs *args = argp;
608 __be32 status;
609 fmode_t flags = 0;
610
611 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
612 if (!cps->clp) /* set in cb_sequence */
613 goto out;
614
615 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
616 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
617
618 status = cpu_to_be32(NFS4ERR_INVAL);
619 if (!validate_bitmap_values(args->craa_type_mask))
620 goto out;
621
622 status = cpu_to_be32(NFS4_OK);
623 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
624 flags = FMODE_READ;
625 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
626 flags |= FMODE_WRITE;
627 if (flags)
628 nfs_expire_unused_delegation_types(cps->clp, flags);
629
630 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
631 pnfs_recall_all_layouts(cps->clp);
632out:
633 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
634 return status;
635}
636
637/* Reduce the fore channel's max_slots to the target value */
638__be32 nfs4_callback_recallslot(void *argp, void *resp,
639 struct cb_process_state *cps)
640{
641 struct cb_recallslotargs *args = argp;
642 struct nfs4_slot_table *fc_tbl;
643 __be32 status;
644
645 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
646 if (!cps->clp) /* set in cb_sequence */
647 goto out;
648
649 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
650 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
651 args->crsa_target_highest_slotid);
652
653 fc_tbl = &cps->clp->cl_session->fc_slot_table;
654
655 status = htonl(NFS4_OK);
656
657 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
658 nfs41_notify_server(cps->clp);
659out:
660 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
661 return status;
662}
663
664__be32 nfs4_callback_notify_lock(void *argp, void *resp,
665 struct cb_process_state *cps)
666{
667 struct cb_notify_lock_args *args = argp;
668
669 if (!cps->clp) /* set in cb_sequence */
670 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
671
672 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
673 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
674
675 /* Don't wake anybody if the string looked bogus */
676 if (args->cbnl_valid)
677 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
678
679 return htonl(NFS4_OK);
680}
681#endif /* CONFIG_NFS_V4_1 */
682#ifdef CONFIG_NFS_V4_2
683static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
684 struct cb_offloadargs *args)
685{
686 cp_state->count = args->wr_count;
687 cp_state->error = args->error;
688 if (!args->error) {
689 cp_state->verf.committed = args->wr_writeverf.committed;
690 memcpy(&cp_state->verf.verifier.data[0],
691 &args->wr_writeverf.verifier.data[0],
692 NFS4_VERIFIER_SIZE);
693 }
694}
695
696__be32 nfs4_callback_offload(void *data, void *dummy,
697 struct cb_process_state *cps)
698{
699 struct cb_offloadargs *args = data;
700 struct nfs_server *server;
701 struct nfs4_copy_state *copy, *tmp_copy;
702 bool found = false;
703
704 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
705 if (!copy)
706 return htonl(NFS4ERR_SERVERFAULT);
707
708 spin_lock(&cps->clp->cl_lock);
709 rcu_read_lock();
710 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
711 client_link) {
712 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
713 if (memcmp(args->coa_stateid.other,
714 tmp_copy->stateid.other,
715 sizeof(args->coa_stateid.other)))
716 continue;
717 nfs4_copy_cb_args(tmp_copy, args);
718 complete(&tmp_copy->completion);
719 found = true;
720 goto out;
721 }
722 }
723out:
724 rcu_read_unlock();
725 if (!found) {
726 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
727 nfs4_copy_cb_args(copy, args);
728 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
729 } else
730 kfree(copy);
731 spin_unlock(&cps->clp->cl_lock);
732
733 return 0;
734}
735#endif /* CONFIG_NFS_V4_2 */