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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.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
10 #include <linux/errno.h>
11 #include <linux/math.h>
12 #include <linux/nfs4.h>
13 #include <linux/nfs_fs.h>
14 #include <linux/slab.h>
15 #include <linux/rcupdate.h>
16 #include <linux/types.h>
17
18 #include "nfs4_fs.h"
19 #include "callback.h"
20 #include "delegation.h"
21 #include "internal.h"
22 #include "pnfs.h"
23 #include "nfs4session.h"
24 #include "nfs4trace.h"
25
26 #define NFSDBG_FACILITY NFSDBG_CALLBACK
27
28 __be32 nfs4_callback_getattr(void *argp, void *resp,
29                              struct cb_process_state *cps)
30 {
31         struct cb_getattrargs *args = argp;
32         struct cb_getattrres *res = resp;
33         struct nfs_delegation *delegation;
34         struct inode *inode;
35
36         res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
37         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
38                 goto out;
39
40         memset(res->bitmap, 0, sizeof(res->bitmap));
41         res->status = htonl(NFS4ERR_BADHANDLE);
42
43         dprintk_rcu("NFS: GETATTR callback request from %s\n",
44                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
45
46         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
47         if (IS_ERR(inode)) {
48                 if (inode == ERR_PTR(-EAGAIN))
49                         res->status = htonl(NFS4ERR_DELAY);
50                 trace_nfs4_cb_getattr(cps->clp, &args->fh, NULL,
51                                 -ntohl(res->status));
52                 goto out;
53         }
54         rcu_read_lock();
55         delegation = nfs4_get_valid_delegation(inode);
56         if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
57                 goto out_iput;
58         res->size = i_size_read(inode);
59         res->change_attr = delegation->change_attr;
60         if (nfs_have_writebacks(inode))
61                 res->change_attr++;
62         res->atime = inode_get_atime(inode);
63         res->ctime = inode_get_ctime(inode);
64         res->mtime = inode_get_mtime(inode);
65         res->bitmap[0] = (FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE) &
66                          args->bitmap[0];
67         res->bitmap[1] = (FATTR4_WORD1_TIME_ACCESS |
68                           FATTR4_WORD1_TIME_METADATA |
69                           FATTR4_WORD1_TIME_MODIFY) & args->bitmap[1];
70         res->bitmap[2] = (FATTR4_WORD2_TIME_DELEG_ACCESS |
71                           FATTR4_WORD2_TIME_DELEG_MODIFY) & args->bitmap[2];
72         res->status = 0;
73 out_iput:
74         rcu_read_unlock();
75         trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
76         nfs_iput_and_deactive(inode);
77 out:
78         dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
79         return res->status;
80 }
81
82 __be32 nfs4_callback_recall(void *argp, void *resp,
83                             struct cb_process_state *cps)
84 {
85         struct cb_recallargs *args = argp;
86         struct inode *inode;
87         __be32 res;
88         
89         res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
90         if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
91                 goto out;
92
93         dprintk_rcu("NFS: RECALL callback request from %s\n",
94                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
95
96         res = htonl(NFS4ERR_BADHANDLE);
97         inode = nfs_delegation_find_inode(cps->clp, &args->fh);
98         if (IS_ERR(inode)) {
99                 if (inode == ERR_PTR(-EAGAIN))
100                         res = htonl(NFS4ERR_DELAY);
101                 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
102                                 &args->stateid, -ntohl(res));
103                 goto out;
104         }
105         /* Set up a helper thread to actually return the delegation */
106         switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
107         case 0:
108                 res = 0;
109                 break;
110         case -ENOENT:
111                 res = htonl(NFS4ERR_BAD_STATEID);
112                 break;
113         default:
114                 res = htonl(NFS4ERR_RESOURCE);
115         }
116         trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
117                         &args->stateid, -ntohl(res));
118         nfs_iput_and_deactive(inode);
119 out:
120         dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
121         return res;
122 }
123
124 #if defined(CONFIG_NFS_V4_1)
125
126 /*
127  * Lookup a layout inode by stateid
128  *
129  * Note: returns a refcount on the inode and superblock
130  */
131 static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
132                 const nfs4_stateid *stateid)
133         __must_hold(RCU)
134 {
135         struct nfs_server *server;
136         struct inode *inode;
137         struct pnfs_layout_hdr *lo;
138
139         rcu_read_lock();
140         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
141                 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
142                         if (!pnfs_layout_is_valid(lo))
143                                 continue;
144                         if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
145                                 continue;
146                         if (nfs_sb_active(server->super))
147                                 inode = igrab(lo->plh_inode);
148                         else
149                                 inode = ERR_PTR(-EAGAIN);
150                         rcu_read_unlock();
151                         if (inode)
152                                 return inode;
153                         nfs_sb_deactive(server->super);
154                         return ERR_PTR(-EAGAIN);
155                 }
156         }
157         rcu_read_unlock();
158         return ERR_PTR(-ENOENT);
159 }
160
161 /*
162  * Lookup a layout inode by filehandle.
163  *
164  * Note: returns a refcount on the inode and superblock
165  *
166  */
167 static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
168                 const struct nfs_fh *fh)
169 {
170         struct nfs_server *server;
171         struct nfs_inode *nfsi;
172         struct inode *inode;
173         struct pnfs_layout_hdr *lo;
174
175         rcu_read_lock();
176         list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
177                 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
178                         nfsi = NFS_I(lo->plh_inode);
179                         if (nfs_compare_fh(fh, &nfsi->fh))
180                                 continue;
181                         if (nfsi->layout != lo)
182                                 continue;
183                         if (nfs_sb_active(server->super))
184                                 inode = igrab(lo->plh_inode);
185                         else
186                                 inode = ERR_PTR(-EAGAIN);
187                         rcu_read_unlock();
188                         if (inode)
189                                 return inode;
190                         nfs_sb_deactive(server->super);
191                         return ERR_PTR(-EAGAIN);
192                 }
193         }
194         rcu_read_unlock();
195         return ERR_PTR(-ENOENT);
196 }
197
198 static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
199                 const struct nfs_fh *fh,
200                 const nfs4_stateid *stateid)
201 {
202         struct inode *inode;
203
204         inode = nfs_layout_find_inode_by_stateid(clp, stateid);
205         if (inode == ERR_PTR(-ENOENT))
206                 inode = nfs_layout_find_inode_by_fh(clp, fh);
207         return inode;
208 }
209
210 /*
211  * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
212  */
213 static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
214                                         const nfs4_stateid *new,
215                                         struct cb_process_state *cps)
216 {
217         u32 oldseq, newseq;
218
219         /* Is the stateid not initialised? */
220         if (!pnfs_layout_is_valid(lo))
221                 return NFS4ERR_NOMATCHING_LAYOUT;
222
223         /* Mismatched stateid? */
224         if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
225                 return NFS4ERR_BAD_STATEID;
226
227         newseq = be32_to_cpu(new->seqid);
228         /* Are we already in a layout recall situation? */
229         if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags))
230                 return NFS4ERR_DELAY;
231
232         /*
233          * Check that the stateid matches what we think it should be.
234          * Note that if the server sent us a list of referring calls,
235          * and we know that those have completed, then we trust the
236          * stateid argument is correct.
237          */
238         oldseq = be32_to_cpu(lo->plh_stateid.seqid);
239         if (newseq > oldseq + 1 && !cps->referring_calls)
240                 return NFS4ERR_DELAY;
241
242         /* Crazy server! */
243         if (newseq <= oldseq)
244                 return NFS4ERR_OLD_STATEID;
245
246         return NFS_OK;
247 }
248
249 static u32 initiate_file_draining(struct nfs_client *clp,
250                                   struct cb_layoutrecallargs *args,
251                                   struct cb_process_state *cps)
252 {
253         struct inode *ino;
254         struct pnfs_layout_hdr *lo;
255         u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
256         LIST_HEAD(free_me_list);
257
258         ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
259         if (IS_ERR(ino)) {
260                 if (ino == ERR_PTR(-EAGAIN))
261                         rv = NFS4ERR_DELAY;
262                 goto out_noput;
263         }
264
265         pnfs_layoutcommit_inode(ino, false);
266
267
268         spin_lock(&ino->i_lock);
269         lo = NFS_I(ino)->layout;
270         if (!lo) {
271                 spin_unlock(&ino->i_lock);
272                 goto out;
273         }
274         pnfs_get_layout_hdr(lo);
275         rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid, cps);
276         if (rv != NFS_OK)
277                 goto unlock;
278
279         /*
280          * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
281          */
282         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
283                 rv = NFS4ERR_DELAY;
284                 goto unlock;
285         }
286
287         pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
288         switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
289                                 &args->cbl_range,
290                                 be32_to_cpu(args->cbl_stateid.seqid))) {
291         case 0:
292         case -EBUSY:
293                 /* There are layout segments that need to be returned */
294                 rv = NFS4_OK;
295                 break;
296         case -ENOENT:
297                 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags);
298                 /* Embrace your forgetfulness! */
299                 rv = NFS4ERR_NOMATCHING_LAYOUT;
300
301                 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
302                         NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
303                                 &args->cbl_range);
304                 }
305         }
306 unlock:
307         spin_unlock(&ino->i_lock);
308         pnfs_free_lseg_list(&free_me_list);
309         /* Free all lsegs that are attached to commit buckets */
310         nfs_commit_inode(ino, 0);
311         pnfs_put_layout_hdr(lo);
312 out:
313         nfs_iput_and_deactive(ino);
314 out_noput:
315         trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
316                         &args->cbl_stateid, -rv);
317         return rv;
318 }
319
320 static u32 initiate_bulk_draining(struct nfs_client *clp,
321                                   struct cb_layoutrecallargs *args)
322 {
323         int stat;
324
325         if (args->cbl_recall_type == RETURN_FSID)
326                 stat = pnfs_layout_destroy_byfsid(clp, &args->cbl_fsid,
327                                                   PNFS_LAYOUT_BULK_RETURN);
328         else
329                 stat = pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_BULK_RETURN);
330         if (stat != 0)
331                 return NFS4ERR_DELAY;
332         return NFS4ERR_NOMATCHING_LAYOUT;
333 }
334
335 static u32 do_callback_layoutrecall(struct nfs_client *clp,
336                                     struct cb_layoutrecallargs *args,
337                                     struct cb_process_state *cps)
338 {
339         if (args->cbl_recall_type == RETURN_FILE)
340                 return initiate_file_draining(clp, args, cps);
341         return initiate_bulk_draining(clp, args);
342 }
343
344 __be32 nfs4_callback_layoutrecall(void *argp, void *resp,
345                                   struct cb_process_state *cps)
346 {
347         struct cb_layoutrecallargs *args = argp;
348         u32 res = NFS4ERR_OP_NOT_IN_SESSION;
349
350         if (cps->clp)
351                 res = do_callback_layoutrecall(cps->clp, args, cps);
352         return cpu_to_be32(res);
353 }
354
355 static void pnfs_recall_all_layouts(struct nfs_client *clp,
356                                     struct cb_process_state *cps)
357 {
358         struct cb_layoutrecallargs args;
359
360         /* Pretend we got a CB_LAYOUTRECALL(ALL) */
361         memset(&args, 0, sizeof(args));
362         args.cbl_recall_type = RETURN_ALL;
363         /* FIXME we ignore errors, what should we do? */
364         do_callback_layoutrecall(clp, &args, cps);
365 }
366
367 __be32 nfs4_callback_devicenotify(void *argp, void *resp,
368                                   struct cb_process_state *cps)
369 {
370         struct cb_devicenotifyargs *args = argp;
371         const struct pnfs_layoutdriver_type *ld = NULL;
372         uint32_t i;
373         __be32 res = 0;
374
375         if (!cps->clp) {
376                 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
377                 goto out;
378         }
379
380         for (i = 0; i < args->ndevs; i++) {
381                 struct cb_devicenotifyitem *dev = &args->devs[i];
382
383                 if (!ld || ld->id != dev->cbd_layout_type) {
384                         pnfs_put_layoutdriver(ld);
385                         ld = pnfs_find_layoutdriver(dev->cbd_layout_type);
386                         if (!ld)
387                                 continue;
388                 }
389                 nfs4_delete_deviceid(ld, cps->clp, &dev->cbd_dev_id);
390         }
391         pnfs_put_layoutdriver(ld);
392 out:
393         kfree(args->devs);
394         return res;
395 }
396
397 /*
398  * Validate the sequenceID sent by the server.
399  * Return success if the sequenceID is one more than what we last saw on
400  * this slot, accounting for wraparound.  Increments the slot's sequence.
401  *
402  * We don't yet implement a duplicate request cache, instead we set the
403  * back channel ca_maxresponsesize_cached to zero. This is OK for now
404  * since we only currently implement idempotent callbacks anyway.
405  *
406  * We have a single slot backchannel at this time, so we don't bother
407  * checking the used_slots bit array on the table.  The lower layer guarantees
408  * a single outstanding callback request at a time.
409  */
410 static __be32
411 validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
412                 const struct cb_sequenceargs * args)
413 {
414         __be32 ret;
415
416         ret = cpu_to_be32(NFS4ERR_BADSLOT);
417         if (args->csa_slotid > tbl->server_highest_slotid)
418                 goto out_err;
419
420         /* Replay */
421         if (args->csa_sequenceid == slot->seq_nr) {
422                 ret = cpu_to_be32(NFS4ERR_DELAY);
423                 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
424                         goto out_err;
425
426                 /* Signal process_op to set this error on next op */
427                 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
428                 if (args->csa_cachethis == 0)
429                         goto out_err;
430
431                 /* Liar! We never allowed you to set csa_cachethis != 0 */
432                 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
433                 goto out_err;
434         }
435
436         /* Note: wraparound relies on seq_nr being of type u32 */
437         /* Misordered request */
438         ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
439         if (args->csa_sequenceid != slot->seq_nr + 1)
440                 goto out_err;
441
442         return cpu_to_be32(NFS4_OK);
443
444 out_err:
445         trace_nfs4_cb_seqid_err(args, ret);
446         return ret;
447 }
448
449 /*
450  * For each referring call triple, check the session's slot table for
451  * a match.  If the slot is in use and the sequence numbers match, the
452  * client is still waiting for a response to the original request.
453  */
454 static int referring_call_exists(struct nfs_client *clp,
455                                   uint32_t nrclists,
456                                   struct referring_call_list *rclists,
457                                   spinlock_t *lock)
458         __releases(lock)
459         __acquires(lock)
460 {
461         int status = 0;
462         int found = 0;
463         int i, j;
464         struct nfs4_session *session;
465         struct nfs4_slot_table *tbl;
466         struct referring_call_list *rclist;
467         struct referring_call *ref;
468
469         /*
470          * XXX When client trunking is implemented, this becomes
471          * a session lookup from within the loop
472          */
473         session = clp->cl_session;
474         tbl = &session->fc_slot_table;
475
476         for (i = 0; i < nrclists; i++) {
477                 rclist = &rclists[i];
478                 if (memcmp(session->sess_id.data,
479                            rclist->rcl_sessionid.data,
480                            NFS4_MAX_SESSIONID_LEN) != 0)
481                         continue;
482
483                 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
484                         ref = &rclist->rcl_refcalls[j];
485                         spin_unlock(lock);
486                         status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
487                                         ref->rc_sequenceid, HZ >> 1) < 0;
488                         spin_lock(lock);
489                         if (status)
490                                 goto out;
491                         found++;
492                 }
493         }
494
495 out:
496         return status < 0 ? status : found;
497 }
498
499 __be32 nfs4_callback_sequence(void *argp, void *resp,
500                               struct cb_process_state *cps)
501 {
502         struct cb_sequenceargs *args = argp;
503         struct cb_sequenceres *res = resp;
504         struct nfs4_slot_table *tbl;
505         struct nfs4_slot *slot;
506         struct nfs_client *clp;
507         int ret;
508         int i;
509         __be32 status = htonl(NFS4ERR_BADSESSION);
510
511         clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
512                                          &args->csa_sessionid, cps->minorversion);
513         if (clp == NULL)
514                 goto out;
515
516         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
517                 goto out;
518
519         tbl = &clp->cl_session->bc_slot_table;
520
521         /* Set up res before grabbing the spinlock */
522         memcpy(&res->csr_sessionid, &args->csa_sessionid,
523                sizeof(res->csr_sessionid));
524         res->csr_sequenceid = args->csa_sequenceid;
525         res->csr_slotid = args->csa_slotid;
526
527         spin_lock(&tbl->slot_tbl_lock);
528         /* state manager is resetting the session */
529         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
530                 status = htonl(NFS4ERR_DELAY);
531                 /* Return NFS4ERR_BADSESSION if we're draining the session
532                  * in order to reset it.
533                  */
534                 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
535                         status = htonl(NFS4ERR_BADSESSION);
536                 goto out_unlock;
537         }
538
539         status = htonl(NFS4ERR_BADSLOT);
540         slot = nfs4_lookup_slot(tbl, args->csa_slotid);
541         if (IS_ERR(slot))
542                 goto out_unlock;
543
544         res->csr_highestslotid = tbl->server_highest_slotid;
545         res->csr_target_highestslotid = tbl->target_highest_slotid;
546
547         status = validate_seqid(tbl, slot, args);
548         if (status)
549                 goto out_unlock;
550         if (!nfs4_try_to_lock_slot(tbl, slot)) {
551                 status = htonl(NFS4ERR_DELAY);
552                 goto out_unlock;
553         }
554         cps->slot = slot;
555
556         /* The ca_maxresponsesize_cached is 0 with no DRC */
557         if (args->csa_cachethis != 0) {
558                 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
559                 goto out_unlock;
560         }
561
562         /*
563          * Check for pending referring calls.  If a match is found, a
564          * related callback was received before the response to the original
565          * call.
566          */
567         ret = referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
568                                     &tbl->slot_tbl_lock);
569         if (ret < 0) {
570                 status = htonl(NFS4ERR_DELAY);
571                 goto out_unlock;
572         }
573         cps->referring_calls = ret;
574
575         /*
576          * RFC5661 20.9.3
577          * If CB_SEQUENCE returns an error, then the state of the slot
578          * (sequence ID, cached reply) MUST NOT change.
579          */
580         slot->seq_nr = args->csa_sequenceid;
581 out_unlock:
582         spin_unlock(&tbl->slot_tbl_lock);
583
584 out:
585         cps->clp = clp; /* put in nfs4_callback_compound */
586         for (i = 0; i < args->csa_nrclists; i++)
587                 kfree(args->csa_rclists[i].rcl_refcalls);
588         kfree(args->csa_rclists);
589
590         if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
591                 cps->drc_status = status;
592                 status = 0;
593         } else
594                 res->csr_status = status;
595
596         trace_nfs4_cb_sequence(args, res, status);
597         return status;
598 }
599
600 static bool
601 validate_bitmap_values(unsigned int mask)
602 {
603         return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
604 }
605
606 __be32 nfs4_callback_recallany(void *argp, void *resp,
607                                struct cb_process_state *cps)
608 {
609         struct cb_recallanyargs *args = argp;
610         __be32 status;
611         fmode_t flags = 0;
612         bool schedule_manager = false;
613
614         status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
615         if (!cps->clp) /* set in cb_sequence */
616                 goto out;
617
618         dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
619                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
620
621         status = cpu_to_be32(NFS4ERR_INVAL);
622         if (!validate_bitmap_values(args->craa_type_mask))
623                 goto out;
624
625         status = cpu_to_be32(NFS4_OK);
626         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
627                 flags = FMODE_READ;
628         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
629                 flags |= FMODE_WRITE;
630         if (flags)
631                 nfs_expire_unused_delegation_types(cps->clp, flags);
632
633         if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
634                 pnfs_recall_all_layouts(cps->clp, cps);
635
636         if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
637                 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
638                 schedule_manager = true;
639         }
640         if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
641                 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
642                 schedule_manager = true;
643         }
644         if (schedule_manager)
645                 nfs4_schedule_state_manager(cps->clp);
646
647 out:
648         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
649         return status;
650 }
651
652 /* Reduce the fore channel's max_slots to the target value */
653 __be32 nfs4_callback_recallslot(void *argp, void *resp,
654                                 struct cb_process_state *cps)
655 {
656         struct cb_recallslotargs *args = argp;
657         struct nfs4_slot_table *fc_tbl;
658         __be32 status;
659
660         status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
661         if (!cps->clp) /* set in cb_sequence */
662                 goto out;
663
664         dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
665                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
666                 args->crsa_target_highest_slotid);
667
668         fc_tbl = &cps->clp->cl_session->fc_slot_table;
669
670         status = htonl(NFS4_OK);
671
672         nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
673         nfs41_notify_server(cps->clp);
674 out:
675         dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
676         return status;
677 }
678
679 __be32 nfs4_callback_notify_lock(void *argp, void *resp,
680                                  struct cb_process_state *cps)
681 {
682         struct cb_notify_lock_args *args = argp;
683
684         if (!cps->clp) /* set in cb_sequence */
685                 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
686
687         dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
688                 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
689
690         /* Don't wake anybody if the string looked bogus */
691         if (args->cbnl_valid)
692                 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
693
694         return htonl(NFS4_OK);
695 }
696 #endif /* CONFIG_NFS_V4_1 */
697 #ifdef CONFIG_NFS_V4_2
698 static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
699                                 struct cb_offloadargs *args)
700 {
701         cp_state->count = args->wr_count;
702         cp_state->error = args->error;
703         if (!args->error) {
704                 cp_state->verf.committed = args->wr_writeverf.committed;
705                 memcpy(&cp_state->verf.verifier.data[0],
706                         &args->wr_writeverf.verifier.data[0],
707                         NFS4_VERIFIER_SIZE);
708         }
709 }
710
711 __be32 nfs4_callback_offload(void *data, void *dummy,
712                              struct cb_process_state *cps)
713 {
714         struct cb_offloadargs *args = data;
715         struct nfs_server *server;
716         struct nfs4_copy_state *copy, *tmp_copy;
717         bool found = false;
718
719         copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
720         if (!copy)
721                 return htonl(NFS4ERR_SERVERFAULT);
722
723         spin_lock(&cps->clp->cl_lock);
724         rcu_read_lock();
725         list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
726                                 client_link) {
727                 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
728                         if (memcmp(args->coa_stateid.other,
729                                         tmp_copy->stateid.other,
730                                         sizeof(args->coa_stateid.other)))
731                                 continue;
732                         nfs4_copy_cb_args(tmp_copy, args);
733                         complete(&tmp_copy->completion);
734                         found = true;
735                         goto out;
736                 }
737         }
738 out:
739         rcu_read_unlock();
740         if (!found) {
741                 memcpy(&copy->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
742                 nfs4_copy_cb_args(copy, args);
743                 list_add_tail(&copy->copies, &cps->clp->pending_cb_stateids);
744         } else
745                 kfree(copy);
746         spin_unlock(&cps->clp->cl_lock);
747
748         trace_nfs4_cb_offload(&args->coa_fh, &args->coa_stateid,
749                         args->wr_count, args->error,
750                         args->wr_writeverf.committed);
751         return 0;
752 }
753 #endif /* CONFIG_NFS_V4_2 */
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