GNU Linux-libre 4.19.207-gnu1
[releases.git] / fs / nfs / callback_proc.c
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;
66 out_iput:
67         rcu_read_unlock();
68         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
69         nfs_iput_and_deactive(inode);
70 out:
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);
112 out:
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  */
124 static 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 (!pnfs_layout_is_valid(lo))
134                                 continue;
135                         if (stateid != NULL &&
136                             !nfs4_stateid_match_other(stateid, &lo->plh_stateid))
137                                 continue;
138                         inode = igrab(lo->plh_inode);
139                         if (!inode)
140                                 return ERR_PTR(-EAGAIN);
141                         if (!nfs_sb_active(inode->i_sb)) {
142                                 rcu_read_unlock();
143                                 spin_unlock(&clp->cl_lock);
144                                 iput(inode);
145                                 spin_lock(&clp->cl_lock);
146                                 rcu_read_lock();
147                                 return ERR_PTR(-EAGAIN);
148                         }
149                         return inode;
150                 }
151         }
152
153         return ERR_PTR(-ENOENT);
154 }
155
156 /*
157  * Lookup a layout inode by filehandle.
158  *
159  * Note: returns a refcount on the inode and superblock
160  *
161  */
162 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
163                 const struct nfs_fh *fh)
164 {
165         struct nfs_server *server;
166         struct nfs_inode *nfsi;
167         struct inode *inode;
168         struct pnfs_layout_hdr *lo;
169
170         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
171                 list_for_each_entry(lo, &server->layouts, plh_layouts) {
172                         nfsi = NFS_I(lo->plh_inode);
173                         if (nfs_compare_fh(fh, &nfsi->fh))
174                                 continue;
175                         if (nfsi->layout != lo)
176                                 continue;
177                         inode = igrab(lo->plh_inode);
178                         if (!inode)
179                                 return ERR_PTR(-EAGAIN);
180                         if (!nfs_sb_active(inode->i_sb)) {
181                                 rcu_read_unlock();
182                                 spin_unlock(&clp->cl_lock);
183                                 iput(inode);
184                                 spin_lock(&clp->cl_lock);
185                                 rcu_read_lock();
186                                 return ERR_PTR(-EAGAIN);
187                         }
188                         return inode;
189                 }
190         }
191
192         return ERR_PTR(-ENOENT);
193 }
194
195 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
196                 const struct nfs_fh *fh,
197                 const nfs4_stateid *stateid)
198 {
199         struct inode *inode;
200
201         spin_lock(&clp->cl_lock);
202         rcu_read_lock();
203         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
204         if (inode == ERR_PTR(-ENOENT))
205                 inode = nfs_layout_find_inode_by_fh(clp, fh);
206         rcu_read_unlock();
207         spin_unlock(&clp->cl_lock);
208
209         return inode;
210 }
211
212 /*
213  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
214  */
215 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
216                                         const nfs4_stateid *new)
217 {
218         u32 oldseq, newseq;
219
220         /* Is the stateid not initialised? */
221         if (!pnfs_layout_is_valid(lo))
222                 return NFS4ERR_NOMATCHING_LAYOUT;
223
224         /* Mismatched stateid? */
225         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
226                 return NFS4ERR_BAD_STATEID;
227
228         newseq = be32_to_cpu(new->seqid);
229         /* Are we already in a layout recall situation? */
230         if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
231             lo->plh_return_seq != 0) {
232                 if (newseq < lo->plh_return_seq)
233                         return NFS4ERR_OLD_STATEID;
234                 if (newseq > lo->plh_return_seq)
235                         return NFS4ERR_DELAY;
236                 goto out;
237         }
238
239         /* Check that the stateid matches what we think it should be. */
240         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
241         if (newseq > oldseq + 1)
242                 return NFS4ERR_DELAY;
243         /* Crazy server! */
244         if (newseq <= oldseq)
245                 return NFS4ERR_OLD_STATEID;
246 out:
247         return NFS_OK;
248 }
249
250 static u32 initiate_file_draining(struct nfs_client *clp,
251                                   struct cb_layoutrecallargs *args)
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);
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, 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                 /* Embrace your forgetfulness! */
298                 rv = NFS4ERR_NOMATCHING_LAYOUT;
299
300                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
301                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
302                                 &args->cbl_range);
303                 }
304         }
305 unlock:
306         spin_unlock(&ino->i_lock);
307         pnfs_free_lseg_list(&free_me_list);
308         /* Free all lsegs that are attached to commit buckets */
309         nfs_commit_inode(ino, 0);
310         pnfs_put_layout_hdr(lo);
311 out:
312         nfs_iput_and_deactive(ino);
313 out_noput:
314         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
315                         &args->cbl_stateid, -rv);
316         return rv;
317 }
318
319 static u32 initiate_bulk_draining(struct nfs_client *clp,
320                                   struct cb_layoutrecallargs *args)
321 {
322         int stat;
323
324         if (args->cbl_recall_type == RETURN_FSID)
325                 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
326         else
327                 stat = pnfs_destroy_layouts_byclid(clp, true);
328         if (stat != 0)
329                 return NFS4ERR_DELAY;
330         return NFS4ERR_NOMATCHING_LAYOUT;
331 }
332
333 static u32 do_callback_layoutrecall(struct nfs_client *clp,
334                                     struct cb_layoutrecallargs *args)
335 {
336         if (args->cbl_recall_type == RETURN_FILE)
337                 return initiate_file_draining(clp, args);
338         return initiate_bulk_draining(clp, args);
339 }
340
341 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
342                                   struct cb_process_state *cps)
343 {
344         struct cb_layoutrecallargs *args = argp;
345         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
346
347         if (cps->clp)
348                 res = do_callback_layoutrecall(cps->clp, args);
349         return cpu_to_be32(res);
350 }
351
352 static void pnfs_recall_all_layouts(struct nfs_client *clp)
353 {
354         struct cb_layoutrecallargs args;
355
356         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
357         memset(&args, 0, sizeof(args));
358         args.cbl_recall_type = RETURN_ALL;
359         /* FIXME we ignore errors, what should we do? */
360         do_callback_layoutrecall(clp, &args);
361 }
362
363 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
364                                   struct cb_process_state *cps)
365 {
366         struct cb_devicenotifyargs *args = argp;
367         int i;
368         __be32 res = 0;
369         struct nfs_client *clp = cps->clp;
370         struct nfs_server *server = NULL;
371
372         if (!clp) {
373                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
374                 goto out;
375         }
376
377         for (i = 0; i < args->ndevs; i++) {
378                 struct cb_devicenotifyitem *dev = &args->devs[i];
379
380                 if (!server ||
381                     server->pnfs_curr_ld->id != dev->cbd_layout_type) {
382                         rcu_read_lock();
383                         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
384                                 if (server->pnfs_curr_ld &&
385                                     server->pnfs_curr_ld->id == dev->cbd_layout_type) {
386                                         rcu_read_unlock();
387                                         goto found;
388                                 }
389                         rcu_read_unlock();
390                         continue;
391                 }
392
393         found:
394                 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
395         }
396
397 out:
398         kfree(args->devs);
399         return res;
400 }
401
402 /*
403  * Validate the sequenceID sent by the server.
404  * Return success if the sequenceID is one more than what we last saw on
405  * this slot, accounting for wraparound.  Increments the slot's sequence.
406  *
407  * We don't yet implement a duplicate request cache, instead we set the
408  * back channel ca_maxresponsesize_cached to zero. This is OK for now
409  * since we only currently implement idempotent callbacks anyway.
410  *
411  * We have a single slot backchannel at this time, so we don't bother
412  * checking the used_slots bit array on the table.  The lower layer guarantees
413  * a single outstanding callback request at a time.
414  */
415 static __be32
416 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
417                 const struct cb_sequenceargs * args)
418 {
419         if (args->csa_slotid > tbl->server_highest_slotid)
420                 return htonl(NFS4ERR_BADSLOT);
421
422         /* Replay */
423         if (args->csa_sequenceid == slot->seq_nr) {
424                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
425                         return htonl(NFS4ERR_DELAY);
426                 /* Signal process_op to set this error on next op */
427                 if (args->csa_cachethis == 0)
428                         return htonl(NFS4ERR_RETRY_UNCACHED_REP);
429
430                 /* Liar! We never allowed you to set csa_cachethis != 0 */
431                 return htonl(NFS4ERR_SEQ_FALSE_RETRY);
432         }
433
434         /* Note: wraparound relies on seq_nr being of type u32 */
435         if (likely(args->csa_sequenceid == slot->seq_nr + 1))
436                 return htonl(NFS4_OK);
437
438         /* Misordered request */
439         return htonl(NFS4ERR_SEQ_MISORDERED);
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  */
447 static 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
486 out:
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;
569 out_unlock:
570         spin_unlock(&tbl->slot_tbl_lock);
571
572 out:
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
588 static bool
589 validate_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
601         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
602         if (!cps->clp) /* set in cb_sequence */
603                 goto out;
604
605         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
606                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
607
608         status = cpu_to_be32(NFS4ERR_INVAL);
609         if (!validate_bitmap_values(args->craa_type_mask))
610                 goto out;
611
612         status = cpu_to_be32(NFS4_OK);
613         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
614                 flags = FMODE_READ;
615         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
616                 flags |= FMODE_WRITE;
617         if (flags)
618                 nfs_expire_unused_delegation_types(cps->clp, flags);
619
620         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
621                 pnfs_recall_all_layouts(cps->clp);
622 out:
623         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
624         return status;
625 }
626
627 /* Reduce the fore channel's max_slots to the target value */
628 __be32 nfs4_callback_recallslot(void *argp, void *resp,
629                                 struct cb_process_state *cps)
630 {
631         struct cb_recallslotargs *args = argp;
632         struct nfs4_slot_table *fc_tbl;
633         __be32 status;
634
635         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
636         if (!cps->clp) /* set in cb_sequence */
637                 goto out;
638
639         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
640                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
641                 args->crsa_target_highest_slotid);
642
643         fc_tbl = &cps->clp->cl_session->fc_slot_table;
644
645         status = htonl(NFS4_OK);
646
647         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
648         nfs41_notify_server(cps->clp);
649 out:
650         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
651         return status;
652 }
653
654 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
655                                  struct cb_process_state *cps)
656 {
657         struct cb_notify_lock_args *args = argp;
658
659         if (!cps->clp) /* set in cb_sequence */
660                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
661
662         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
663                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
664
665         /* Don't wake anybody if the string looked bogus */
666         if (args->cbnl_valid)
667                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
668
669         return htonl(NFS4_OK);
670 }
671 #endif /* CONFIG_NFS_V4_1 */
672 #ifdef CONFIG_NFS_V4_2
673 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
674                                 struct cb_offloadargs *args)
675 {
676         cp_state->count = args->wr_count;
677         cp_state->error = args->error;
678         if (!args->error) {
679                 cp_state->verf.committed = args->wr_writeverf.committed;
680                 memcpy(&cp_state->verf.verifier.data[0],
681                         &args->wr_writeverf.verifier.data[0],
682                         NFS4_VERIFIER_SIZE);
683         }
684 }
685
686 __be32 nfs4_callback_offload(void *data, void *dummy,
687                              struct cb_process_state *cps)
688 {
689         struct cb_offloadargs *args = data;
690         struct nfs_server *server;
691         struct nfs4_copy_state *copy, *tmp_copy;
692         bool found = false;
693
694         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
695         if (!copy)
696                 return htonl(NFS4ERR_SERVERFAULT);
697
698         spin_lock(&cps->clp->cl_lock);
699         rcu_read_lock();
700         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
701                                 client_link) {
702                 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
703                         if (memcmp(args->coa_stateid.other,
704                                         tmp_copy->stateid.other,
705                                         sizeof(args->coa_stateid.other)))
706                                 continue;
707                         nfs4_copy_cb_args(tmp_copy, args);
708                         complete(&tmp_copy->completion);
709                         found = true;
710                         goto out;
711                 }
712         }
713 out:
714         rcu_read_unlock();
715         if (!found) {
716                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
717                 nfs4_copy_cb_args(copy, args);
718                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
719         } else
720                 kfree(copy);
721         spin_unlock(&cps->clp->cl_lock);
722
723         return 0;
724 }
725 #endif /* CONFIG_NFS_V4_2 */