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
nfs4_callback_getattr(void * argp,void * resp,struct cb_process_state * cps)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;
64 out_iput:
65 rcu_read_unlock();
66 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
67 nfs_iput_and_deactive(inode);
68 out:
69 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
70 return res->status;
71 }
72
nfs4_callback_recall(void * argp,void * resp,struct cb_process_state * cps)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);
110 out:
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 */
nfs_layout_find_inode_by_stateid(struct nfs_client * clp,const nfs4_stateid * stateid)122 static 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 (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
136 continue;
137 if (nfs_sb_active(server->super))
138 inode = igrab(lo->plh_inode);
139 else
140 inode = ERR_PTR(-EAGAIN);
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 */
nfs_layout_find_inode_by_fh(struct nfs_client * clp,const struct nfs_fh * fh)158 static 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 inode = igrab(lo->plh_inode);
176 else
177 inode = ERR_PTR(-EAGAIN);
178 rcu_read_unlock();
179 if (inode)
180 return inode;
181 nfs_sb_deactive(server->super);
182 return ERR_PTR(-EAGAIN);
183 }
184 }
185 rcu_read_unlock();
186 return ERR_PTR(-ENOENT);
187 }
188
nfs_layout_find_inode(struct nfs_client * clp,const struct nfs_fh * fh,const nfs4_stateid * stateid)189 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
190 const struct nfs_fh *fh,
191 const nfs4_stateid *stateid)
192 {
193 struct inode *inode;
194
195 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
196 if (inode == ERR_PTR(-ENOENT))
197 inode = nfs_layout_find_inode_by_fh(clp, fh);
198 return inode;
199 }
200
201 /*
202 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
203 */
pnfs_check_callback_stateid(struct pnfs_layout_hdr * lo,const nfs4_stateid * new)204 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
205 const nfs4_stateid *new)
206 {
207 u32 oldseq, newseq;
208
209 /* Is the stateid not initialised? */
210 if (!pnfs_layout_is_valid(lo))
211 return NFS4ERR_NOMATCHING_LAYOUT;
212
213 /* Mismatched stateid? */
214 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
215 return NFS4ERR_BAD_STATEID;
216
217 newseq = be32_to_cpu(new->seqid);
218 /* Are we already in a layout recall situation? */
219 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
220 lo->plh_return_seq != 0) {
221 if (newseq < lo->plh_return_seq)
222 return NFS4ERR_OLD_STATEID;
223 if (newseq > lo->plh_return_seq)
224 return NFS4ERR_DELAY;
225 goto out;
226 }
227
228 /* Check that the stateid matches what we think it should be. */
229 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
230 if (newseq > oldseq + 1)
231 return NFS4ERR_DELAY;
232 /* Crazy server! */
233 if (newseq <= oldseq)
234 return NFS4ERR_OLD_STATEID;
235 out:
236 return NFS_OK;
237 }
238
initiate_file_draining(struct nfs_client * clp,struct cb_layoutrecallargs * args)239 static u32 initiate_file_draining(struct nfs_client *clp,
240 struct cb_layoutrecallargs *args)
241 {
242 struct inode *ino;
243 struct pnfs_layout_hdr *lo;
244 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
245 LIST_HEAD(free_me_list);
246
247 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
248 if (IS_ERR(ino)) {
249 if (ino == ERR_PTR(-EAGAIN))
250 rv = NFS4ERR_DELAY;
251 goto out_noput;
252 }
253
254 pnfs_layoutcommit_inode(ino, false);
255
256
257 spin_lock(&ino->i_lock);
258 lo = NFS_I(ino)->layout;
259 if (!lo) {
260 spin_unlock(&ino->i_lock);
261 goto out;
262 }
263 pnfs_get_layout_hdr(lo);
264 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
265 if (rv != NFS_OK)
266 goto unlock;
267
268 /*
269 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
270 */
271 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
272 rv = NFS4ERR_DELAY;
273 goto unlock;
274 }
275
276 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
277 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
278 &args->cbl_range,
279 be32_to_cpu(args->cbl_stateid.seqid))) {
280 case 0:
281 case -EBUSY:
282 /* There are layout segments that need to be returned */
283 rv = NFS4_OK;
284 break;
285 case -ENOENT:
286 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
287 /* Embrace your forgetfulness! */
288 rv = NFS4ERR_NOMATCHING_LAYOUT;
289
290 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
291 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
292 &args->cbl_range);
293 }
294 }
295 unlock:
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);
301 out:
302 nfs_iput_and_deactive(ino);
303 out_noput:
304 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
305 &args->cbl_stateid, -rv);
306 return rv;
307 }
308
initiate_bulk_draining(struct nfs_client * clp,struct cb_layoutrecallargs * args)309 static u32 initiate_bulk_draining(struct nfs_client *clp,
310 struct cb_layoutrecallargs *args)
311 {
312 int stat;
313
314 if (args->cbl_recall_type == RETURN_FSID)
315 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
316 else
317 stat = pnfs_destroy_layouts_byclid(clp, true);
318 if (stat != 0)
319 return NFS4ERR_DELAY;
320 return NFS4ERR_NOMATCHING_LAYOUT;
321 }
322
do_callback_layoutrecall(struct nfs_client * clp,struct cb_layoutrecallargs * args)323 static u32 do_callback_layoutrecall(struct nfs_client *clp,
324 struct cb_layoutrecallargs *args)
325 {
326 if (args->cbl_recall_type == RETURN_FILE)
327 return initiate_file_draining(clp, args);
328 return initiate_bulk_draining(clp, args);
329 }
330
nfs4_callback_layoutrecall(void * argp,void * resp,struct cb_process_state * cps)331 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
332 struct cb_process_state *cps)
333 {
334 struct cb_layoutrecallargs *args = argp;
335 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
336
337 if (cps->clp)
338 res = do_callback_layoutrecall(cps->clp, args);
339 return cpu_to_be32(res);
340 }
341
pnfs_recall_all_layouts(struct nfs_client * clp)342 static void pnfs_recall_all_layouts(struct nfs_client *clp)
343 {
344 struct cb_layoutrecallargs args;
345
346 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
347 memset(&args, 0, sizeof(args));
348 args.cbl_recall_type = RETURN_ALL;
349 /* FIXME we ignore errors, what should we do? */
350 do_callback_layoutrecall(clp, &args);
351 }
352
nfs4_callback_devicenotify(void * argp,void * resp,struct cb_process_state * cps)353 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
354 struct cb_process_state *cps)
355 {
356 struct cb_devicenotifyargs *args = argp;
357 const struct pnfs_layoutdriver_type *ld = NULL;
358 uint32_t i;
359 __be32 res = 0;
360
361 if (!cps->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 (!ld || ld->id != dev->cbd_layout_type) {
370 pnfs_put_layoutdriver(ld);
371 ld = pnfs_find_layoutdriver(dev->cbd_layout_type);
372 if (!ld)
373 continue;
374 }
375 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id);
376 }
377 pnfs_put_layoutdriver(ld);
378 out:
379 kfree(args->devs);
380 return res;
381 }
382
383 /*
384 * Validate the sequenceID sent by the server.
385 * Return success if the sequenceID is one more than what we last saw on
386 * this slot, accounting for wraparound. Increments the slot's sequence.
387 *
388 * We don't yet implement a duplicate request cache, instead we set the
389 * back channel ca_maxresponsesize_cached to zero. This is OK for now
390 * since we only currently implement idempotent callbacks anyway.
391 *
392 * We have a single slot backchannel at this time, so we don't bother
393 * checking the used_slots bit array on the table. The lower layer guarantees
394 * a single outstanding callback request at a time.
395 */
396 static __be32
validate_seqid(const struct nfs4_slot_table * tbl,const struct nfs4_slot * slot,const struct cb_sequenceargs * args)397 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
398 const struct cb_sequenceargs * args)
399 {
400 __be32 ret;
401
402 ret = cpu_to_be32(NFS4ERR_BADSLOT);
403 if (args->csa_slotid > tbl->server_highest_slotid)
404 goto out_err;
405
406 /* Replay */
407 if (args->csa_sequenceid == slot->seq_nr) {
408 ret = cpu_to_be32(NFS4ERR_DELAY);
409 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
410 goto out_err;
411
412 /* Signal process_op to set this error on next op */
413 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
414 if (args->csa_cachethis == 0)
415 goto out_err;
416
417 /* Liar! We never allowed you to set csa_cachethis != 0 */
418 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
419 goto out_err;
420 }
421
422 /* Note: wraparound relies on seq_nr being of type u32 */
423 /* Misordered request */
424 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
425 if (args->csa_sequenceid != slot->seq_nr + 1)
426 goto out_err;
427
428 return cpu_to_be32(NFS4_OK);
429
430 out_err:
431 trace_nfs4_cb_seqid_err(args, ret);
432 return ret;
433 }
434
435 /*
436 * For each referring call triple, check the session's slot table for
437 * a match. If the slot is in use and the sequence numbers match, the
438 * client is still waiting for a response to the original request.
439 */
referring_call_exists(struct nfs_client * clp,uint32_t nrclists,struct referring_call_list * rclists,spinlock_t * lock)440 static int referring_call_exists(struct nfs_client *clp,
441 uint32_t nrclists,
442 struct referring_call_list *rclists,
443 spinlock_t *lock)
444 __releases(lock)
445 __acquires(lock)
446 {
447 int status = 0;
448 int i, j;
449 struct nfs4_session *session;
450 struct nfs4_slot_table *tbl;
451 struct referring_call_list *rclist;
452 struct referring_call *ref;
453
454 /*
455 * XXX When client trunking is implemented, this becomes
456 * a session lookup from within the loop
457 */
458 session = clp->cl_session;
459 tbl = &session->fc_slot_table;
460
461 for (i = 0; i < nrclists; i++) {
462 rclist = &rclists[i];
463 if (memcmp(session->sess_id.data,
464 rclist->rcl_sessionid.data,
465 NFS4_MAX_SESSIONID_LEN) != 0)
466 continue;
467
468 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
469 ref = &rclist->rcl_refcalls[j];
470 spin_unlock(lock);
471 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
472 ref->rc_sequenceid, HZ >> 1) < 0;
473 spin_lock(lock);
474 if (status)
475 goto out;
476 }
477 }
478
479 out:
480 return status;
481 }
482
nfs4_callback_sequence(void * argp,void * resp,struct cb_process_state * cps)483 __be32 nfs4_callback_sequence(void *argp, void *resp,
484 struct cb_process_state *cps)
485 {
486 struct cb_sequenceargs *args = argp;
487 struct cb_sequenceres *res = resp;
488 struct nfs4_slot_table *tbl;
489 struct nfs4_slot *slot;
490 struct nfs_client *clp;
491 int i;
492 __be32 status = htonl(NFS4ERR_BADSESSION);
493
494 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
495 &args->csa_sessionid, cps->minorversion);
496 if (clp == NULL)
497 goto out;
498
499 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
500 goto out;
501
502 tbl = &clp->cl_session->bc_slot_table;
503
504 /* Set up res before grabbing the spinlock */
505 memcpy(&res->csr_sessionid, &args->csa_sessionid,
506 sizeof(res->csr_sessionid));
507 res->csr_sequenceid = args->csa_sequenceid;
508 res->csr_slotid = args->csa_slotid;
509
510 spin_lock(&tbl->slot_tbl_lock);
511 /* state manager is resetting the session */
512 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
513 status = htonl(NFS4ERR_DELAY);
514 /* Return NFS4ERR_BADSESSION if we're draining the session
515 * in order to reset it.
516 */
517 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
518 status = htonl(NFS4ERR_BADSESSION);
519 goto out_unlock;
520 }
521
522 status = htonl(NFS4ERR_BADSLOT);
523 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
524 if (IS_ERR(slot))
525 goto out_unlock;
526
527 res->csr_highestslotid = tbl->server_highest_slotid;
528 res->csr_target_highestslotid = tbl->target_highest_slotid;
529
530 status = validate_seqid(tbl, slot, args);
531 if (status)
532 goto out_unlock;
533 if (!nfs4_try_to_lock_slot(tbl, slot)) {
534 status = htonl(NFS4ERR_DELAY);
535 goto out_unlock;
536 }
537 cps->slot = slot;
538
539 /* The ca_maxresponsesize_cached is 0 with no DRC */
540 if (args->csa_cachethis != 0) {
541 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
542 goto out_unlock;
543 }
544
545 /*
546 * Check for pending referring calls. If a match is found, a
547 * related callback was received before the response to the original
548 * call.
549 */
550 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
551 &tbl->slot_tbl_lock) < 0) {
552 status = htonl(NFS4ERR_DELAY);
553 goto out_unlock;
554 }
555
556 /*
557 * RFC5661 20.9.3
558 * If CB_SEQUENCE returns an error, then the state of the slot
559 * (sequence ID, cached reply) MUST NOT change.
560 */
561 slot->seq_nr = args->csa_sequenceid;
562 out_unlock:
563 spin_unlock(&tbl->slot_tbl_lock);
564
565 out:
566 cps->clp = clp; /* put in nfs4_callback_compound */
567 for (i = 0; i < args->csa_nrclists; i++)
568 kfree(args->csa_rclists[i].rcl_refcalls);
569 kfree(args->csa_rclists);
570
571 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
572 cps->drc_status = status;
573 status = 0;
574 } else
575 res->csr_status = status;
576
577 trace_nfs4_cb_sequence(args, res, status);
578 return status;
579 }
580
581 static bool
validate_bitmap_values(unsigned int mask)582 validate_bitmap_values(unsigned int mask)
583 {
584 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
585 }
586
nfs4_callback_recallany(void * argp,void * resp,struct cb_process_state * cps)587 __be32 nfs4_callback_recallany(void *argp, void *resp,
588 struct cb_process_state *cps)
589 {
590 struct cb_recallanyargs *args = argp;
591 __be32 status;
592 fmode_t flags = 0;
593 bool schedule_manager = false;
594
595 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
596 if (!cps->clp) /* set in cb_sequence */
597 goto out;
598
599 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
600 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
601
602 status = cpu_to_be32(NFS4ERR_INVAL);
603 if (!validate_bitmap_values(args->craa_type_mask))
604 goto out;
605
606 status = cpu_to_be32(NFS4_OK);
607 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
608 flags = FMODE_READ;
609 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
610 flags |= FMODE_WRITE;
611 if (flags)
612 nfs_expire_unused_delegation_types(cps->clp, flags);
613
614 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
615 pnfs_recall_all_layouts(cps->clp);
616
617 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
618 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
619 schedule_manager = true;
620 }
621 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
622 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
623 schedule_manager = true;
624 }
625 if (schedule_manager)
626 nfs4_schedule_state_manager(cps->clp);
627
628 out:
629 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
630 return status;
631 }
632
633 /* Reduce the fore channel's max_slots to the target value */
nfs4_callback_recallslot(void * argp,void * resp,struct cb_process_state * cps)634 __be32 nfs4_callback_recallslot(void *argp, void *resp,
635 struct cb_process_state *cps)
636 {
637 struct cb_recallslotargs *args = argp;
638 struct nfs4_slot_table *fc_tbl;
639 __be32 status;
640
641 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
642 if (!cps->clp) /* set in cb_sequence */
643 goto out;
644
645 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
646 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
647 args->crsa_target_highest_slotid);
648
649 fc_tbl = &cps->clp->cl_session->fc_slot_table;
650
651 status = htonl(NFS4_OK);
652
653 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
654 nfs41_notify_server(cps->clp);
655 out:
656 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
657 return status;
658 }
659
nfs4_callback_notify_lock(void * argp,void * resp,struct cb_process_state * cps)660 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
661 struct cb_process_state *cps)
662 {
663 struct cb_notify_lock_args *args = argp;
664
665 if (!cps->clp) /* set in cb_sequence */
666 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
667
668 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
669 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
670
671 /* Don't wake anybody if the string looked bogus */
672 if (args->cbnl_valid)
673 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
674
675 return htonl(NFS4_OK);
676 }
677 #endif /* CONFIG_NFS_V4_1 */
678 #ifdef CONFIG_NFS_V4_2
nfs4_copy_cb_args(struct nfs4_copy_state * cp_state,struct cb_offloadargs * args)679 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
680 struct cb_offloadargs *args)
681 {
682 cp_state->count = args->wr_count;
683 cp_state->error = args->error;
684 if (!args->error) {
685 cp_state->verf.committed = args->wr_writeverf.committed;
686 memcpy(&cp_state->verf.verifier.data[0],
687 &args->wr_writeverf.verifier.data[0],
688 NFS4_VERIFIER_SIZE);
689 }
690 }
691
nfs4_callback_offload(void * data,void * dummy,struct cb_process_state * cps)692 __be32 nfs4_callback_offload(void *data, void *dummy,
693 struct cb_process_state *cps)
694 {
695 struct cb_offloadargs *args = data;
696 struct nfs_server *server;
697 struct nfs4_copy_state *copy, *tmp_copy;
698 bool found = false;
699
700 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
701 if (!copy)
702 return htonl(NFS4ERR_SERVERFAULT);
703
704 spin_lock(&cps->clp->cl_lock);
705 rcu_read_lock();
706 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
707 client_link) {
708 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
709 if (memcmp(args->coa_stateid.other,
710 tmp_copy->stateid.other,
711 sizeof(args->coa_stateid.other)))
712 continue;
713 nfs4_copy_cb_args(tmp_copy, args);
714 complete(&tmp_copy->completion);
715 found = true;
716 goto out;
717 }
718 }
719 out:
720 rcu_read_unlock();
721 if (!found) {
722 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
723 nfs4_copy_cb_args(copy, args);
724 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
725 } else
726 kfree(copy);
727 spin_unlock(&cps->clp->cl_lock);
728
729 return 0;
730 }
731 #endif /* CONFIG_NFS_V4_2 */
732