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1/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
8#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
10#include <linux/slab.h>
11#include "nfs4_fs.h"
12#include "callback.h"
13#include "delegation.h"
14#include "internal.h"
15#include "pnfs.h"
16
17#ifdef NFS_DEBUG
18#define NFSDBG_FACILITY NFSDBG_CALLBACK
19#endif
20
21__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
22 struct cb_getattrres *res,
23 struct cb_process_state *cps)
24{
25 struct nfs_delegation *delegation;
26 struct nfs_inode *nfsi;
27 struct inode *inode;
28
29 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
30 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
31 goto out;
32
33 res->bitmap[0] = res->bitmap[1] = 0;
34 res->status = htonl(NFS4ERR_BADHANDLE);
35
36 dprintk("NFS: GETATTR callback request from %s\n",
37 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
38
39 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
40 if (inode == NULL)
41 goto out;
42 nfsi = NFS_I(inode);
43 rcu_read_lock();
44 delegation = rcu_dereference(nfsi->delegation);
45 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
46 goto out_iput;
47 res->size = i_size_read(inode);
48 res->change_attr = delegation->change_attr;
49 if (nfsi->npages != 0)
50 res->change_attr++;
51 res->ctime = inode->i_ctime;
52 res->mtime = inode->i_mtime;
53 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
54 args->bitmap[0];
55 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
56 args->bitmap[1];
57 res->status = 0;
58out_iput:
59 rcu_read_unlock();
60 iput(inode);
61out:
62 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
63 return res->status;
64}
65
66__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
67 struct cb_process_state *cps)
68{
69 struct inode *inode;
70 __be32 res;
71
72 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
73 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
74 goto out;
75
76 dprintk("NFS: RECALL callback request from %s\n",
77 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
78
79 res = htonl(NFS4ERR_BADHANDLE);
80 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
81 if (inode == NULL)
82 goto out;
83 /* Set up a helper thread to actually return the delegation */
84 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
85 case 0:
86 res = 0;
87 break;
88 case -ENOENT:
89 if (res != 0)
90 res = htonl(NFS4ERR_BAD_STATEID);
91 break;
92 default:
93 res = htonl(NFS4ERR_RESOURCE);
94 }
95 iput(inode);
96out:
97 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
98 return res;
99}
100
101int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
102{
103 if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
104 sizeof(delegation->stateid.data)) != 0)
105 return 0;
106 return 1;
107}
108
109#if defined(CONFIG_NFS_V4_1)
110
111static u32 initiate_file_draining(struct nfs_client *clp,
112 struct cb_layoutrecallargs *args)
113{
114 struct nfs_server *server;
115 struct pnfs_layout_hdr *lo;
116 struct inode *ino;
117 bool found = false;
118 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
119 LIST_HEAD(free_me_list);
120
121 spin_lock(&clp->cl_lock);
122 rcu_read_lock();
123 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
124 list_for_each_entry(lo, &server->layouts, plh_layouts) {
125 if (nfs_compare_fh(&args->cbl_fh,
126 &NFS_I(lo->plh_inode)->fh))
127 continue;
128 ino = igrab(lo->plh_inode);
129 if (!ino)
130 continue;
131 found = true;
132 /* Without this, layout can be freed as soon
133 * as we release cl_lock.
134 */
135 get_layout_hdr(lo);
136 break;
137 }
138 if (found)
139 break;
140 }
141 rcu_read_unlock();
142 spin_unlock(&clp->cl_lock);
143
144 if (!found)
145 return NFS4ERR_NOMATCHING_LAYOUT;
146
147 spin_lock(&ino->i_lock);
148 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
149 mark_matching_lsegs_invalid(lo, &free_me_list,
150 &args->cbl_range))
151 rv = NFS4ERR_DELAY;
152 else
153 rv = NFS4ERR_NOMATCHING_LAYOUT;
154 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
155 spin_unlock(&ino->i_lock);
156 pnfs_free_lseg_list(&free_me_list);
157 put_layout_hdr(lo);
158 iput(ino);
159 return rv;
160}
161
162static u32 initiate_bulk_draining(struct nfs_client *clp,
163 struct cb_layoutrecallargs *args)
164{
165 struct nfs_server *server;
166 struct pnfs_layout_hdr *lo;
167 struct inode *ino;
168 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
169 struct pnfs_layout_hdr *tmp;
170 LIST_HEAD(recall_list);
171 LIST_HEAD(free_me_list);
172 struct pnfs_layout_range range = {
173 .iomode = IOMODE_ANY,
174 .offset = 0,
175 .length = NFS4_MAX_UINT64,
176 };
177
178 spin_lock(&clp->cl_lock);
179 rcu_read_lock();
180 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
181 if ((args->cbl_recall_type == RETURN_FSID) &&
182 memcmp(&server->fsid, &args->cbl_fsid,
183 sizeof(struct nfs_fsid)))
184 continue;
185
186 list_for_each_entry(lo, &server->layouts, plh_layouts) {
187 if (!igrab(lo->plh_inode))
188 continue;
189 get_layout_hdr(lo);
190 BUG_ON(!list_empty(&lo->plh_bulk_recall));
191 list_add(&lo->plh_bulk_recall, &recall_list);
192 }
193 }
194 rcu_read_unlock();
195 spin_unlock(&clp->cl_lock);
196
197 list_for_each_entry_safe(lo, tmp,
198 &recall_list, plh_bulk_recall) {
199 ino = lo->plh_inode;
200 spin_lock(&ino->i_lock);
201 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
202 if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
203 rv = NFS4ERR_DELAY;
204 list_del_init(&lo->plh_bulk_recall);
205 spin_unlock(&ino->i_lock);
206 pnfs_free_lseg_list(&free_me_list);
207 put_layout_hdr(lo);
208 iput(ino);
209 }
210 return rv;
211}
212
213static u32 do_callback_layoutrecall(struct nfs_client *clp,
214 struct cb_layoutrecallargs *args)
215{
216 u32 res = NFS4ERR_DELAY;
217
218 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
219 if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
220 goto out;
221 if (args->cbl_recall_type == RETURN_FILE)
222 res = initiate_file_draining(clp, args);
223 else
224 res = initiate_bulk_draining(clp, args);
225 clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
226out:
227 dprintk("%s returning %i\n", __func__, res);
228 return res;
229
230}
231
232__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
233 void *dummy, struct cb_process_state *cps)
234{
235 u32 res;
236
237 dprintk("%s: -->\n", __func__);
238
239 if (cps->clp)
240 res = do_callback_layoutrecall(cps->clp, args);
241 else
242 res = NFS4ERR_OP_NOT_IN_SESSION;
243
244 dprintk("%s: exit with status = %d\n", __func__, res);
245 return cpu_to_be32(res);
246}
247
248static void pnfs_recall_all_layouts(struct nfs_client *clp)
249{
250 struct cb_layoutrecallargs args;
251
252 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
253 memset(&args, 0, sizeof(args));
254 args.cbl_recall_type = RETURN_ALL;
255 /* FIXME we ignore errors, what should we do? */
256 do_callback_layoutrecall(clp, &args);
257}
258
259__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
260 void *dummy, struct cb_process_state *cps)
261{
262 int i;
263 __be32 res = 0;
264 struct nfs_client *clp = cps->clp;
265 struct nfs_server *server = NULL;
266
267 dprintk("%s: -->\n", __func__);
268
269 if (!clp) {
270 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
271 goto out;
272 }
273
274 for (i = 0; i < args->ndevs; i++) {
275 struct cb_devicenotifyitem *dev = &args->devs[i];
276
277 if (!server ||
278 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
279 rcu_read_lock();
280 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
281 if (server->pnfs_curr_ld &&
282 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
283 rcu_read_unlock();
284 goto found;
285 }
286 rcu_read_unlock();
287 dprintk("%s: layout type %u not found\n",
288 __func__, dev->cbd_layout_type);
289 continue;
290 }
291
292 found:
293 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
294 dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
295 "deleting instead\n", __func__);
296 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
297 }
298
299out:
300 kfree(args->devs);
301 dprintk("%s: exit with status = %u\n",
302 __func__, be32_to_cpu(res));
303 return res;
304}
305
306int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
307{
308 if (delegation == NULL)
309 return 0;
310
311 if (stateid->stateid.seqid != 0)
312 return 0;
313 if (memcmp(&delegation->stateid.stateid.other,
314 &stateid->stateid.other,
315 NFS4_STATEID_OTHER_SIZE))
316 return 0;
317
318 return 1;
319}
320
321/*
322 * Validate the sequenceID sent by the server.
323 * Return success if the sequenceID is one more than what we last saw on
324 * this slot, accounting for wraparound. Increments the slot's sequence.
325 *
326 * We don't yet implement a duplicate request cache, instead we set the
327 * back channel ca_maxresponsesize_cached to zero. This is OK for now
328 * since we only currently implement idempotent callbacks anyway.
329 *
330 * We have a single slot backchannel at this time, so we don't bother
331 * checking the used_slots bit array on the table. The lower layer guarantees
332 * a single outstanding callback request at a time.
333 */
334static __be32
335validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
336{
337 struct nfs4_slot *slot;
338
339 dprintk("%s enter. slotid %d seqid %d\n",
340 __func__, args->csa_slotid, args->csa_sequenceid);
341
342 if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
343 return htonl(NFS4ERR_BADSLOT);
344
345 slot = tbl->slots + args->csa_slotid;
346 dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
347
348 /* Normal */
349 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
350 slot->seq_nr++;
351 goto out_ok;
352 }
353
354 /* Replay */
355 if (args->csa_sequenceid == slot->seq_nr) {
356 dprintk("%s seqid %d is a replay\n",
357 __func__, args->csa_sequenceid);
358 /* Signal process_op to set this error on next op */
359 if (args->csa_cachethis == 0)
360 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
361
362 /* The ca_maxresponsesize_cached is 0 with no DRC */
363 else if (args->csa_cachethis == 1)
364 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
365 }
366
367 /* Wraparound */
368 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
369 slot->seq_nr = 1;
370 goto out_ok;
371 }
372
373 /* Misordered request */
374 return htonl(NFS4ERR_SEQ_MISORDERED);
375out_ok:
376 tbl->highest_used_slotid = args->csa_slotid;
377 return htonl(NFS4_OK);
378}
379
380/*
381 * For each referring call triple, check the session's slot table for
382 * a match. If the slot is in use and the sequence numbers match, the
383 * client is still waiting for a response to the original request.
384 */
385static bool referring_call_exists(struct nfs_client *clp,
386 uint32_t nrclists,
387 struct referring_call_list *rclists)
388{
389 bool status = 0;
390 int i, j;
391 struct nfs4_session *session;
392 struct nfs4_slot_table *tbl;
393 struct referring_call_list *rclist;
394 struct referring_call *ref;
395
396 /*
397 * XXX When client trunking is implemented, this becomes
398 * a session lookup from within the loop
399 */
400 session = clp->cl_session;
401 tbl = &session->fc_slot_table;
402
403 for (i = 0; i < nrclists; i++) {
404 rclist = &rclists[i];
405 if (memcmp(session->sess_id.data,
406 rclist->rcl_sessionid.data,
407 NFS4_MAX_SESSIONID_LEN) != 0)
408 continue;
409
410 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
411 ref = &rclist->rcl_refcalls[j];
412
413 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
414 "slotid %u\n", __func__,
415 ((u32 *)&rclist->rcl_sessionid.data)[0],
416 ((u32 *)&rclist->rcl_sessionid.data)[1],
417 ((u32 *)&rclist->rcl_sessionid.data)[2],
418 ((u32 *)&rclist->rcl_sessionid.data)[3],
419 ref->rc_sequenceid, ref->rc_slotid);
420
421 spin_lock(&tbl->slot_tbl_lock);
422 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
423 tbl->slots[ref->rc_slotid].seq_nr ==
424 ref->rc_sequenceid);
425 spin_unlock(&tbl->slot_tbl_lock);
426 if (status)
427 goto out;
428 }
429 }
430
431out:
432 return status;
433}
434
435__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
436 struct cb_sequenceres *res,
437 struct cb_process_state *cps)
438{
439 struct nfs4_slot_table *tbl;
440 struct nfs_client *clp;
441 int i;
442 __be32 status = htonl(NFS4ERR_BADSESSION);
443
444 clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
445 if (clp == NULL)
446 goto out;
447
448 tbl = &clp->cl_session->bc_slot_table;
449
450 spin_lock(&tbl->slot_tbl_lock);
451 /* state manager is resetting the session */
452 if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
453 spin_unlock(&tbl->slot_tbl_lock);
454 status = htonl(NFS4ERR_DELAY);
455 /* Return NFS4ERR_BADSESSION if we're draining the session
456 * in order to reset it.
457 */
458 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
459 status = htonl(NFS4ERR_BADSESSION);
460 goto out;
461 }
462
463 status = validate_seqid(&clp->cl_session->bc_slot_table, args);
464 spin_unlock(&tbl->slot_tbl_lock);
465 if (status)
466 goto out;
467
468 cps->slotid = args->csa_slotid;
469
470 /*
471 * Check for pending referring calls. If a match is found, a
472 * related callback was received before the response to the original
473 * call.
474 */
475 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
476 status = htonl(NFS4ERR_DELAY);
477 goto out;
478 }
479
480 memcpy(&res->csr_sessionid, &args->csa_sessionid,
481 sizeof(res->csr_sessionid));
482 res->csr_sequenceid = args->csa_sequenceid;
483 res->csr_slotid = args->csa_slotid;
484 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
485 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
486
487out:
488 cps->clp = clp; /* put in nfs4_callback_compound */
489 for (i = 0; i < args->csa_nrclists; i++)
490 kfree(args->csa_rclists[i].rcl_refcalls);
491 kfree(args->csa_rclists);
492
493 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
494 cps->drc_status = status;
495 status = 0;
496 } else
497 res->csr_status = status;
498
499 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
500 ntohl(status), ntohl(res->csr_status));
501 return status;
502}
503
504static bool
505validate_bitmap_values(unsigned long mask)
506{
507 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
508}
509
510__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
511 struct cb_process_state *cps)
512{
513 __be32 status;
514 fmode_t flags = 0;
515
516 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
517 if (!cps->clp) /* set in cb_sequence */
518 goto out;
519
520 dprintk("NFS: RECALL_ANY callback request from %s\n",
521 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
522
523 status = cpu_to_be32(NFS4ERR_INVAL);
524 if (!validate_bitmap_values(args->craa_type_mask))
525 goto out;
526
527 status = cpu_to_be32(NFS4_OK);
528 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
529 &args->craa_type_mask))
530 flags = FMODE_READ;
531 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
532 &args->craa_type_mask))
533 flags |= FMODE_WRITE;
534 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
535 &args->craa_type_mask))
536 pnfs_recall_all_layouts(cps->clp);
537 if (flags)
538 nfs_expire_all_delegation_types(cps->clp, flags);
539out:
540 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
541 return status;
542}
543
544/* Reduce the fore channel's max_slots to the target value */
545__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
546 struct cb_process_state *cps)
547{
548 struct nfs4_slot_table *fc_tbl;
549 __be32 status;
550
551 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
552 if (!cps->clp) /* set in cb_sequence */
553 goto out;
554
555 dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
556 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
557 args->crsa_target_max_slots);
558
559 fc_tbl = &cps->clp->cl_session->fc_slot_table;
560
561 status = htonl(NFS4ERR_BAD_HIGH_SLOT);
562 if (args->crsa_target_max_slots > fc_tbl->max_slots ||
563 args->crsa_target_max_slots < 1)
564 goto out;
565
566 status = htonl(NFS4_OK);
567 if (args->crsa_target_max_slots == fc_tbl->max_slots)
568 goto out;
569
570 fc_tbl->target_max_slots = args->crsa_target_max_slots;
571 nfs41_handle_recall_slot(cps->clp);
572out:
573 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
574 return status;
575}
576#endif /* CONFIG_NFS_V4_1 */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/nfs/callback_proc.c
4 *
5 * Copyright (C) 2004 Trond Myklebust
6 *
7 * NFSv4 callback procedures
8 */
9
10#include <linux/errno.h>
11#include <linux/math.h>
12#include <linux/nfs4.h>
13#include <linux/nfs_fs.h>
14#include <linux/slab.h>
15#include <linux/rcupdate.h>
16#include <linux/types.h>
17
18#include "nfs4_fs.h"
19#include "callback.h"
20#include "delegation.h"
21#include "internal.h"
22#include "pnfs.h"
23#include "nfs4session.h"
24#include "nfs4trace.h"
25
26#define NFSDBG_FACILITY NFSDBG_CALLBACK
27
28__be32 nfs4_callback_getattr(void *argp, void *resp,
29 struct cb_process_state *cps)
30{
31 struct cb_getattrargs *args = argp;
32 struct cb_getattrres *res = resp;
33 struct nfs_delegation *delegation;
34 struct inode *inode;
35
36 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
37 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
38 goto out;
39
40 res->bitmap[0] = res->bitmap[1] = 0;
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->ctime = inode->i_ctime;
63 res->mtime = inode->i_mtime;
64 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
65 args->bitmap[0];
66 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
67 args->bitmap[1];
68 res->status = 0;
69out_iput:
70 rcu_read_unlock();
71 trace_nfs4_cb_getattr(cps->clp, &args->fh, inode, -ntohl(res->status));
72 nfs_iput_and_deactive(inode);
73out:
74 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
75 return res->status;
76}
77
78__be32 nfs4_callback_recall(void *argp, void *resp,
79 struct cb_process_state *cps)
80{
81 struct cb_recallargs *args = argp;
82 struct inode *inode;
83 __be32 res;
84
85 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
86 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
87 goto out;
88
89 dprintk_rcu("NFS: RECALL callback request from %s\n",
90 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
91
92 res = htonl(NFS4ERR_BADHANDLE);
93 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
94 if (IS_ERR(inode)) {
95 if (inode == ERR_PTR(-EAGAIN))
96 res = htonl(NFS4ERR_DELAY);
97 trace_nfs4_cb_recall(cps->clp, &args->fh, NULL,
98 &args->stateid, -ntohl(res));
99 goto out;
100 }
101 /* Set up a helper thread to actually return the delegation */
102 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
103 case 0:
104 res = 0;
105 break;
106 case -ENOENT:
107 res = htonl(NFS4ERR_BAD_STATEID);
108 break;
109 default:
110 res = htonl(NFS4ERR_RESOURCE);
111 }
112 trace_nfs4_cb_recall(cps->clp, &args->fh, inode,
113 &args->stateid, -ntohl(res));
114 nfs_iput_and_deactive(inode);
115out:
116 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
117 return res;
118}
119
120#if defined(CONFIG_NFS_V4_1)
121
122/*
123 * Lookup a layout inode by stateid
124 *
125 * Note: returns a refcount on the inode and superblock
126 */
127static struct inode *nfs_layout_find_inode_by_stateid(struct nfs_client *clp,
128 const nfs4_stateid *stateid)
129 __must_hold(RCU)
130{
131 struct nfs_server *server;
132 struct inode *inode;
133 struct pnfs_layout_hdr *lo;
134
135 rcu_read_lock();
136 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
137 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
138 if (!pnfs_layout_is_valid(lo))
139 continue;
140 if (!nfs4_stateid_match_other(stateid, &lo->plh_stateid))
141 continue;
142 if (nfs_sb_active(server->super))
143 inode = igrab(lo->plh_inode);
144 else
145 inode = ERR_PTR(-EAGAIN);
146 rcu_read_unlock();
147 if (inode)
148 return inode;
149 nfs_sb_deactive(server->super);
150 return ERR_PTR(-EAGAIN);
151 }
152 }
153 rcu_read_unlock();
154 return ERR_PTR(-ENOENT);
155}
156
157/*
158 * Lookup a layout inode by filehandle.
159 *
160 * Note: returns a refcount on the inode and superblock
161 *
162 */
163static struct inode *nfs_layout_find_inode_by_fh(struct nfs_client *clp,
164 const struct nfs_fh *fh)
165{
166 struct nfs_server *server;
167 struct nfs_inode *nfsi;
168 struct inode *inode;
169 struct pnfs_layout_hdr *lo;
170
171 rcu_read_lock();
172 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
173 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) {
174 nfsi = NFS_I(lo->plh_inode);
175 if (nfs_compare_fh(fh, &nfsi->fh))
176 continue;
177 if (nfsi->layout != lo)
178 continue;
179 if (nfs_sb_active(server->super))
180 inode = igrab(lo->plh_inode);
181 else
182 inode = ERR_PTR(-EAGAIN);
183 rcu_read_unlock();
184 if (inode)
185 return inode;
186 nfs_sb_deactive(server->super);
187 return ERR_PTR(-EAGAIN);
188 }
189 }
190 rcu_read_unlock();
191 return ERR_PTR(-ENOENT);
192}
193
194static struct inode *nfs_layout_find_inode(struct nfs_client *clp,
195 const struct nfs_fh *fh,
196 const nfs4_stateid *stateid)
197{
198 struct inode *inode;
199
200 inode = nfs_layout_find_inode_by_stateid(clp, stateid);
201 if (inode == ERR_PTR(-ENOENT))
202 inode = nfs_layout_find_inode_by_fh(clp, fh);
203 return inode;
204}
205
206/*
207 * Enforce RFC5661 section 12.5.5.2.1. (Layout Recall and Return Sequencing)
208 */
209static u32 pnfs_check_callback_stateid(struct pnfs_layout_hdr *lo,
210 const nfs4_stateid *new)
211{
212 u32 oldseq, newseq;
213
214 /* Is the stateid not initialised? */
215 if (!pnfs_layout_is_valid(lo))
216 return NFS4ERR_NOMATCHING_LAYOUT;
217
218 /* Mismatched stateid? */
219 if (!nfs4_stateid_match_other(&lo->plh_stateid, new))
220 return NFS4ERR_BAD_STATEID;
221
222 newseq = be32_to_cpu(new->seqid);
223 /* Are we already in a layout recall situation? */
224 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) &&
225 lo->plh_return_seq != 0) {
226 if (newseq < lo->plh_return_seq)
227 return NFS4ERR_OLD_STATEID;
228 if (newseq > lo->plh_return_seq)
229 return NFS4ERR_DELAY;
230 goto out;
231 }
232
233 /* Check that the stateid matches what we think it should be. */
234 oldseq = be32_to_cpu(lo->plh_stateid.seqid);
235 if (newseq > oldseq + 1)
236 return NFS4ERR_DELAY;
237 /* Crazy server! */
238 if (newseq <= oldseq)
239 return NFS4ERR_OLD_STATEID;
240out:
241 return NFS_OK;
242}
243
244static u32 initiate_file_draining(struct nfs_client *clp,
245 struct cb_layoutrecallargs *args)
246{
247 struct inode *ino;
248 struct pnfs_layout_hdr *lo;
249 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
250 LIST_HEAD(free_me_list);
251
252 ino = nfs_layout_find_inode(clp, &args->cbl_fh, &args->cbl_stateid);
253 if (IS_ERR(ino)) {
254 if (ino == ERR_PTR(-EAGAIN))
255 rv = NFS4ERR_DELAY;
256 goto out_noput;
257 }
258
259 pnfs_layoutcommit_inode(ino, false);
260
261
262 spin_lock(&ino->i_lock);
263 lo = NFS_I(ino)->layout;
264 if (!lo) {
265 spin_unlock(&ino->i_lock);
266 goto out;
267 }
268 pnfs_get_layout_hdr(lo);
269 rv = pnfs_check_callback_stateid(lo, &args->cbl_stateid);
270 if (rv != NFS_OK)
271 goto unlock;
272
273 /*
274 * Enforce RFC5661 Section 12.5.5.2.1.5 (Bulk Recall and Return)
275 */
276 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
277 rv = NFS4ERR_DELAY;
278 goto unlock;
279 }
280
281 pnfs_set_layout_stateid(lo, &args->cbl_stateid, NULL, true);
282 switch (pnfs_mark_matching_lsegs_return(lo, &free_me_list,
283 &args->cbl_range,
284 be32_to_cpu(args->cbl_stateid.seqid))) {
285 case 0:
286 case -EBUSY:
287 /* There are layout segments that need to be returned */
288 rv = NFS4_OK;
289 break;
290 case -ENOENT:
291 /* Embrace your forgetfulness! */
292 rv = NFS4ERR_NOMATCHING_LAYOUT;
293
294 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
295 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
296 &args->cbl_range);
297 }
298 }
299unlock:
300 spin_unlock(&ino->i_lock);
301 pnfs_free_lseg_list(&free_me_list);
302 /* Free all lsegs that are attached to commit buckets */
303 nfs_commit_inode(ino, 0);
304 pnfs_put_layout_hdr(lo);
305out:
306 nfs_iput_and_deactive(ino);
307out_noput:
308 trace_nfs4_cb_layoutrecall_file(clp, &args->cbl_fh, ino,
309 &args->cbl_stateid, -rv);
310 return rv;
311}
312
313static u32 initiate_bulk_draining(struct nfs_client *clp,
314 struct cb_layoutrecallargs *args)
315{
316 int stat;
317
318 if (args->cbl_recall_type == RETURN_FSID)
319 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
320 else
321 stat = pnfs_destroy_layouts_byclid(clp, true);
322 if (stat != 0)
323 return NFS4ERR_DELAY;
324 return NFS4ERR_NOMATCHING_LAYOUT;
325}
326
327static u32 do_callback_layoutrecall(struct nfs_client *clp,
328 struct cb_layoutrecallargs *args)
329{
330 if (args->cbl_recall_type == RETURN_FILE)
331 return initiate_file_draining(clp, args);
332 return initiate_bulk_draining(clp, args);
333}
334
335__be32 nfs4_callback_layoutrecall(void *argp, void *resp,
336 struct cb_process_state *cps)
337{
338 struct cb_layoutrecallargs *args = argp;
339 u32 res = NFS4ERR_OP_NOT_IN_SESSION;
340
341 if (cps->clp)
342 res = do_callback_layoutrecall(cps->clp, args);
343 return cpu_to_be32(res);
344}
345
346static void pnfs_recall_all_layouts(struct nfs_client *clp)
347{
348 struct cb_layoutrecallargs args;
349
350 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
351 memset(&args, 0, sizeof(args));
352 args.cbl_recall_type = RETURN_ALL;
353 /* FIXME we ignore errors, what should we do? */
354 do_callback_layoutrecall(clp, &args);
355}
356
357__be32 nfs4_callback_devicenotify(void *argp, void *resp,
358 struct cb_process_state *cps)
359{
360 struct cb_devicenotifyargs *args = argp;
361 int i;
362 __be32 res = 0;
363 struct nfs_client *clp = cps->clp;
364 struct nfs_server *server = NULL;
365
366 if (!clp) {
367 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
368 goto out;
369 }
370
371 for (i = 0; i < args->ndevs; i++) {
372 struct cb_devicenotifyitem *dev = &args->devs[i];
373
374 if (!server ||
375 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
376 rcu_read_lock();
377 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
378 if (server->pnfs_curr_ld &&
379 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
380 rcu_read_unlock();
381 goto found;
382 }
383 rcu_read_unlock();
384 continue;
385 }
386
387 found:
388 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
389 }
390
391out:
392 kfree(args->devs);
393 return res;
394}
395
396/*
397 * Validate the sequenceID sent by the server.
398 * Return success if the sequenceID is one more than what we last saw on
399 * this slot, accounting for wraparound. Increments the slot's sequence.
400 *
401 * We don't yet implement a duplicate request cache, instead we set the
402 * back channel ca_maxresponsesize_cached to zero. This is OK for now
403 * since we only currently implement idempotent callbacks anyway.
404 *
405 * We have a single slot backchannel at this time, so we don't bother
406 * checking the used_slots bit array on the table. The lower layer guarantees
407 * a single outstanding callback request at a time.
408 */
409static __be32
410validate_seqid(const struct nfs4_slot_table *tbl, const struct nfs4_slot *slot,
411 const struct cb_sequenceargs * args)
412{
413 __be32 ret;
414
415 ret = cpu_to_be32(NFS4ERR_BADSLOT);
416 if (args->csa_slotid > tbl->server_highest_slotid)
417 goto out_err;
418
419 /* Replay */
420 if (args->csa_sequenceid == slot->seq_nr) {
421 ret = cpu_to_be32(NFS4ERR_DELAY);
422 if (nfs4_test_locked_slot(tbl, slot->slot_nr))
423 goto out_err;
424
425 /* Signal process_op to set this error on next op */
426 ret = cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP);
427 if (args->csa_cachethis == 0)
428 goto out_err;
429
430 /* Liar! We never allowed you to set csa_cachethis != 0 */
431 ret = cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY);
432 goto out_err;
433 }
434
435 /* Note: wraparound relies on seq_nr being of type u32 */
436 /* Misordered request */
437 ret = cpu_to_be32(NFS4ERR_SEQ_MISORDERED);
438 if (args->csa_sequenceid != slot->seq_nr + 1)
439 goto out_err;
440
441 return cpu_to_be32(NFS4_OK);
442
443out_err:
444 trace_nfs4_cb_seqid_err(args, ret);
445 return ret;
446}
447
448/*
449 * For each referring call triple, check the session's slot table for
450 * a match. If the slot is in use and the sequence numbers match, the
451 * client is still waiting for a response to the original request.
452 */
453static int referring_call_exists(struct nfs_client *clp,
454 uint32_t nrclists,
455 struct referring_call_list *rclists,
456 spinlock_t *lock)
457 __releases(lock)
458 __acquires(lock)
459{
460 int status = 0;
461 int i, j;
462 struct nfs4_session *session;
463 struct nfs4_slot_table *tbl;
464 struct referring_call_list *rclist;
465 struct referring_call *ref;
466
467 /*
468 * XXX When client trunking is implemented, this becomes
469 * a session lookup from within the loop
470 */
471 session = clp->cl_session;
472 tbl = &session->fc_slot_table;
473
474 for (i = 0; i < nrclists; i++) {
475 rclist = &rclists[i];
476 if (memcmp(session->sess_id.data,
477 rclist->rcl_sessionid.data,
478 NFS4_MAX_SESSIONID_LEN) != 0)
479 continue;
480
481 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
482 ref = &rclist->rcl_refcalls[j];
483 spin_unlock(lock);
484 status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
485 ref->rc_sequenceid, HZ >> 1) < 0;
486 spin_lock(lock);
487 if (status)
488 goto out;
489 }
490 }
491
492out:
493 return status;
494}
495
496__be32 nfs4_callback_sequence(void *argp, void *resp,
497 struct cb_process_state *cps)
498{
499 struct cb_sequenceargs *args = argp;
500 struct cb_sequenceres *res = resp;
501 struct nfs4_slot_table *tbl;
502 struct nfs4_slot *slot;
503 struct nfs_client *clp;
504 int i;
505 __be32 status = htonl(NFS4ERR_BADSESSION);
506
507 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
508 &args->csa_sessionid, cps->minorversion);
509 if (clp == NULL)
510 goto out;
511
512 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
513 goto out;
514
515 tbl = &clp->cl_session->bc_slot_table;
516
517 /* Set up res before grabbing the spinlock */
518 memcpy(&res->csr_sessionid, &args->csa_sessionid,
519 sizeof(res->csr_sessionid));
520 res->csr_sequenceid = args->csa_sequenceid;
521 res->csr_slotid = args->csa_slotid;
522
523 spin_lock(&tbl->slot_tbl_lock);
524 /* state manager is resetting the session */
525 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
526 status = htonl(NFS4ERR_DELAY);
527 /* Return NFS4ERR_BADSESSION if we're draining the session
528 * in order to reset it.
529 */
530 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
531 status = htonl(NFS4ERR_BADSESSION);
532 goto out_unlock;
533 }
534
535 status = htonl(NFS4ERR_BADSLOT);
536 slot = nfs4_lookup_slot(tbl, args->csa_slotid);
537 if (IS_ERR(slot))
538 goto out_unlock;
539
540 res->csr_highestslotid = tbl->server_highest_slotid;
541 res->csr_target_highestslotid = tbl->target_highest_slotid;
542
543 status = validate_seqid(tbl, slot, args);
544 if (status)
545 goto out_unlock;
546 if (!nfs4_try_to_lock_slot(tbl, slot)) {
547 status = htonl(NFS4ERR_DELAY);
548 goto out_unlock;
549 }
550 cps->slot = slot;
551
552 /* The ca_maxresponsesize_cached is 0 with no DRC */
553 if (args->csa_cachethis != 0) {
554 status = htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
555 goto out_unlock;
556 }
557
558 /*
559 * Check for pending referring calls. If a match is found, a
560 * related callback was received before the response to the original
561 * call.
562 */
563 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists,
564 &tbl->slot_tbl_lock) < 0) {
565 status = htonl(NFS4ERR_DELAY);
566 goto out_unlock;
567 }
568
569 /*
570 * RFC5661 20.9.3
571 * If CB_SEQUENCE returns an error, then the state of the slot
572 * (sequence ID, cached reply) MUST NOT change.
573 */
574 slot->seq_nr = args->csa_sequenceid;
575out_unlock:
576 spin_unlock(&tbl->slot_tbl_lock);
577
578out:
579 cps->clp = clp; /* put in nfs4_callback_compound */
580 for (i = 0; i < args->csa_nrclists; i++)
581 kfree(args->csa_rclists[i].rcl_refcalls);
582 kfree(args->csa_rclists);
583
584 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
585 cps->drc_status = status;
586 status = 0;
587 } else
588 res->csr_status = status;
589
590 trace_nfs4_cb_sequence(args, res, status);
591 return status;
592}
593
594static bool
595validate_bitmap_values(unsigned int mask)
596{
597 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
598}
599
600__be32 nfs4_callback_recallany(void *argp, void *resp,
601 struct cb_process_state *cps)
602{
603 struct cb_recallanyargs *args = argp;
604 __be32 status;
605 fmode_t flags = 0;
606 bool schedule_manager = false;
607
608 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
609 if (!cps->clp) /* set in cb_sequence */
610 goto out;
611
612 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
613 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
614
615 status = cpu_to_be32(NFS4ERR_INVAL);
616 if (!validate_bitmap_values(args->craa_type_mask))
617 goto out;
618
619 status = cpu_to_be32(NFS4_OK);
620 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_RDATA_DLG))
621 flags = FMODE_READ;
622 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_WDATA_DLG))
623 flags |= FMODE_WRITE;
624 if (flags)
625 nfs_expire_unused_delegation_types(cps->clp, flags);
626
627 if (args->craa_type_mask & BIT(RCA4_TYPE_MASK_FILE_LAYOUT))
628 pnfs_recall_all_layouts(cps->clp);
629
630 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_READ)) {
631 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &cps->clp->cl_state);
632 schedule_manager = true;
633 }
634 if (args->craa_type_mask & BIT(PNFS_FF_RCA4_TYPE_MASK_RW)) {
635 set_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &cps->clp->cl_state);
636 schedule_manager = true;
637 }
638 if (schedule_manager)
639 nfs4_schedule_state_manager(cps->clp);
640
641out:
642 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
643 return status;
644}
645
646/* Reduce the fore channel's max_slots to the target value */
647__be32 nfs4_callback_recallslot(void *argp, void *resp,
648 struct cb_process_state *cps)
649{
650 struct cb_recallslotargs *args = argp;
651 struct nfs4_slot_table *fc_tbl;
652 __be32 status;
653
654 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
655 if (!cps->clp) /* set in cb_sequence */
656 goto out;
657
658 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
659 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
660 args->crsa_target_highest_slotid);
661
662 fc_tbl = &cps->clp->cl_session->fc_slot_table;
663
664 status = htonl(NFS4_OK);
665
666 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
667 nfs41_notify_server(cps->clp);
668out:
669 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
670 return status;
671}
672
673__be32 nfs4_callback_notify_lock(void *argp, void *resp,
674 struct cb_process_state *cps)
675{
676 struct cb_notify_lock_args *args = argp;
677
678 if (!cps->clp) /* set in cb_sequence */
679 return htonl(NFS4ERR_OP_NOT_IN_SESSION);
680
681 dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n",
682 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
683
684 /* Don't wake anybody if the string looked bogus */
685 if (args->cbnl_valid)
686 __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args);
687
688 return htonl(NFS4_OK);
689}
690#endif /* CONFIG_NFS_V4_1 */
691#ifdef CONFIG_NFS_V4_2
692static void nfs4_copy_cb_args(struct nfs4_copy_state *cp_state,
693 struct cb_offloadargs *args)
694{
695 cp_state->count = args->wr_count;
696 cp_state->error = args->error;
697 if (!args->error) {
698 cp_state->verf.committed = args->wr_writeverf.committed;
699 memcpy(&cp_state->verf.verifier.data[0],
700 &args->wr_writeverf.verifier.data[0],
701 NFS4_VERIFIER_SIZE);
702 }
703}
704
705__be32 nfs4_callback_offload(void *data, void *dummy,
706 struct cb_process_state *cps)
707{
708 struct cb_offloadargs *args = data;
709 struct nfs_server *server;
710 struct nfs4_copy_state *copy, *tmp_copy;
711 bool found = false;
712
713 copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_NOFS);
714 if (!copy)
715 return htonl(NFS4ERR_SERVERFAULT);
716
717 spin_lock(&cps->clp->cl_lock);
718 rcu_read_lock();
719 list_for_each_entry_rcu(server, &cps->clp->cl_superblocks,
720 client_link) {
721 list_for_each_entry(tmp_copy, &server->ss_copies, copies) {
722 if (memcmp(args->coa_stateid.other,
723 tmp_copy->stateid.other,
724 sizeof(args->coa_stateid.other)))
725 continue;
726 nfs4_copy_cb_args(tmp_copy, args);
727 complete(&tmp_copy->completion);
728 found = true;
729 goto out;
730 }
731 }
732out:
733 rcu_read_unlock();
734 if (!found) {
735 memcpy(©->stateid, &args->coa_stateid, NFS4_STATEID_SIZE);
736 nfs4_copy_cb_args(copy, args);
737 list_add_tail(©->copies, &cps->clp->pending_cb_stateids);
738 } else
739 kfree(copy);
740 spin_unlock(&cps->clp->cl_lock);
741
742 return 0;
743}
744#endif /* CONFIG_NFS_V4_2 */