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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/*
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 <linux/rcupdate.h>
12#include "nfs4_fs.h"
13#include "callback.h"
14#include "delegation.h"
15#include "internal.h"
16#include "pnfs.h"
17#include "nfs4session.h"
18#include "nfs4trace.h"
19
20#ifdef NFS_DEBUG
21#define NFSDBG_FACILITY NFSDBG_CALLBACK
22#endif
23
24__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
25 struct cb_getattrres *res,
26 struct cb_process_state *cps)
27{
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 (inode == NULL)
44 goto out;
45 nfsi = NFS_I(inode);
46 rcu_read_lock();
47 delegation = rcu_dereference(nfsi->delegation);
48 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
49 goto out_iput;
50 res->size = i_size_read(inode);
51 res->change_attr = delegation->change_attr;
52 if (nfsi->npages != 0)
53 res->change_attr++;
54 res->ctime = inode->i_ctime;
55 res->mtime = inode->i_mtime;
56 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
57 args->bitmap[0];
58 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
59 args->bitmap[1];
60 res->status = 0;
61out_iput:
62 rcu_read_unlock();
63 iput(inode);
64out:
65 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
66 return res->status;
67}
68
69__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
70 struct cb_process_state *cps)
71{
72 struct inode *inode;
73 __be32 res;
74
75 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
76 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
77 goto out;
78
79 dprintk_rcu("NFS: RECALL callback request from %s\n",
80 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
81
82 res = htonl(NFS4ERR_BADHANDLE);
83 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
84 if (inode == NULL)
85 goto out;
86 /* Set up a helper thread to actually return the delegation */
87 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
88 case 0:
89 res = 0;
90 break;
91 case -ENOENT:
92 res = htonl(NFS4ERR_BAD_STATEID);
93 break;
94 default:
95 res = htonl(NFS4ERR_RESOURCE);
96 }
97 trace_nfs4_recall_delegation(inode, -ntohl(res));
98 iput(inode);
99out:
100 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
101 return res;
102}
103
104#if defined(CONFIG_NFS_V4_1)
105
106/*
107 * Lookup a layout by filehandle.
108 *
109 * Note: gets a refcount on the layout hdr and on its respective inode.
110 * Caller must put the layout hdr and the inode.
111 *
112 * TODO: keep track of all layouts (and delegations) in a hash table
113 * hashed by filehandle.
114 */
115static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
116 struct nfs_fh *fh, nfs4_stateid *stateid)
117{
118 struct nfs_server *server;
119 struct inode *ino;
120 struct pnfs_layout_hdr *lo;
121
122 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
123 list_for_each_entry(lo, &server->layouts, plh_layouts) {
124 if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid))
125 continue;
126 if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
127 continue;
128 ino = igrab(lo->plh_inode);
129 if (!ino)
130 break;
131 spin_lock(&ino->i_lock);
132 /* Is this layout in the process of being freed? */
133 if (NFS_I(ino)->layout != lo) {
134 spin_unlock(&ino->i_lock);
135 iput(ino);
136 break;
137 }
138 pnfs_get_layout_hdr(lo);
139 spin_unlock(&ino->i_lock);
140 return lo;
141 }
142 }
143
144 return NULL;
145}
146
147static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
148 struct nfs_fh *fh, nfs4_stateid *stateid)
149{
150 struct pnfs_layout_hdr *lo;
151
152 spin_lock(&clp->cl_lock);
153 rcu_read_lock();
154 lo = get_layout_by_fh_locked(clp, fh, stateid);
155 rcu_read_unlock();
156 spin_unlock(&clp->cl_lock);
157
158 return lo;
159}
160
161static u32 initiate_file_draining(struct nfs_client *clp,
162 struct cb_layoutrecallargs *args)
163{
164 struct inode *ino;
165 struct pnfs_layout_hdr *lo;
166 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
167 LIST_HEAD(free_me_list);
168
169 lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid);
170 if (!lo)
171 goto out;
172
173 ino = lo->plh_inode;
174 spin_lock(&ino->i_lock);
175 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
176 pnfs_mark_matching_lsegs_invalid(lo, &free_me_list,
177 &args->cbl_range))
178 rv = NFS4ERR_DELAY;
179 else
180 rv = NFS4ERR_NOMATCHING_LAYOUT;
181 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
182 spin_unlock(&ino->i_lock);
183 pnfs_free_lseg_list(&free_me_list);
184 pnfs_put_layout_hdr(lo);
185 iput(ino);
186out:
187 return rv;
188}
189
190static u32 initiate_bulk_draining(struct nfs_client *clp,
191 struct cb_layoutrecallargs *args)
192{
193 int stat;
194
195 if (args->cbl_recall_type == RETURN_FSID)
196 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
197 else
198 stat = pnfs_destroy_layouts_byclid(clp, true);
199 if (stat != 0)
200 return NFS4ERR_DELAY;
201 return NFS4ERR_NOMATCHING_LAYOUT;
202}
203
204static u32 do_callback_layoutrecall(struct nfs_client *clp,
205 struct cb_layoutrecallargs *args)
206{
207 u32 res;
208
209 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
210 if (args->cbl_recall_type == RETURN_FILE)
211 res = initiate_file_draining(clp, args);
212 else
213 res = initiate_bulk_draining(clp, args);
214 dprintk("%s returning %i\n", __func__, res);
215 return res;
216
217}
218
219__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
220 void *dummy, struct cb_process_state *cps)
221{
222 u32 res;
223
224 dprintk("%s: -->\n", __func__);
225
226 if (cps->clp)
227 res = do_callback_layoutrecall(cps->clp, args);
228 else
229 res = NFS4ERR_OP_NOT_IN_SESSION;
230
231 dprintk("%s: exit with status = %d\n", __func__, res);
232 return cpu_to_be32(res);
233}
234
235static void pnfs_recall_all_layouts(struct nfs_client *clp)
236{
237 struct cb_layoutrecallargs args;
238
239 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
240 memset(&args, 0, sizeof(args));
241 args.cbl_recall_type = RETURN_ALL;
242 /* FIXME we ignore errors, what should we do? */
243 do_callback_layoutrecall(clp, &args);
244}
245
246__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
247 void *dummy, struct cb_process_state *cps)
248{
249 int i;
250 __be32 res = 0;
251 struct nfs_client *clp = cps->clp;
252 struct nfs_server *server = NULL;
253
254 dprintk("%s: -->\n", __func__);
255
256 if (!clp) {
257 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
258 goto out;
259 }
260
261 for (i = 0; i < args->ndevs; i++) {
262 struct cb_devicenotifyitem *dev = &args->devs[i];
263
264 if (!server ||
265 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
266 rcu_read_lock();
267 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
268 if (server->pnfs_curr_ld &&
269 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
270 rcu_read_unlock();
271 goto found;
272 }
273 rcu_read_unlock();
274 dprintk("%s: layout type %u not found\n",
275 __func__, dev->cbd_layout_type);
276 continue;
277 }
278
279 found:
280 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
281 dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
282 "deleting instead\n", __func__);
283 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
284 }
285
286out:
287 kfree(args->devs);
288 dprintk("%s: exit with status = %u\n",
289 __func__, be32_to_cpu(res));
290 return res;
291}
292
293/*
294 * Validate the sequenceID sent by the server.
295 * Return success if the sequenceID is one more than what we last saw on
296 * this slot, accounting for wraparound. Increments the slot's sequence.
297 *
298 * We don't yet implement a duplicate request cache, instead we set the
299 * back channel ca_maxresponsesize_cached to zero. This is OK for now
300 * since we only currently implement idempotent callbacks anyway.
301 *
302 * We have a single slot backchannel at this time, so we don't bother
303 * checking the used_slots bit array on the table. The lower layer guarantees
304 * a single outstanding callback request at a time.
305 */
306static __be32
307validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
308{
309 struct nfs4_slot *slot;
310
311 dprintk("%s enter. slotid %u seqid %u\n",
312 __func__, args->csa_slotid, args->csa_sequenceid);
313
314 if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS)
315 return htonl(NFS4ERR_BADSLOT);
316
317 slot = tbl->slots + args->csa_slotid;
318 dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
319
320 /* Normal */
321 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
322 slot->seq_nr++;
323 goto out_ok;
324 }
325
326 /* Replay */
327 if (args->csa_sequenceid == slot->seq_nr) {
328 dprintk("%s seqid %u is a replay\n",
329 __func__, args->csa_sequenceid);
330 /* Signal process_op to set this error on next op */
331 if (args->csa_cachethis == 0)
332 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
333
334 /* The ca_maxresponsesize_cached is 0 with no DRC */
335 else if (args->csa_cachethis == 1)
336 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
337 }
338
339 /* Wraparound */
340 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
341 slot->seq_nr = 1;
342 goto out_ok;
343 }
344
345 /* Misordered request */
346 return htonl(NFS4ERR_SEQ_MISORDERED);
347out_ok:
348 tbl->highest_used_slotid = args->csa_slotid;
349 return htonl(NFS4_OK);
350}
351
352/*
353 * For each referring call triple, check the session's slot table for
354 * a match. If the slot is in use and the sequence numbers match, the
355 * client is still waiting for a response to the original request.
356 */
357static bool referring_call_exists(struct nfs_client *clp,
358 uint32_t nrclists,
359 struct referring_call_list *rclists)
360{
361 bool status = 0;
362 int i, j;
363 struct nfs4_session *session;
364 struct nfs4_slot_table *tbl;
365 struct referring_call_list *rclist;
366 struct referring_call *ref;
367
368 /*
369 * XXX When client trunking is implemented, this becomes
370 * a session lookup from within the loop
371 */
372 session = clp->cl_session;
373 tbl = &session->fc_slot_table;
374
375 for (i = 0; i < nrclists; i++) {
376 rclist = &rclists[i];
377 if (memcmp(session->sess_id.data,
378 rclist->rcl_sessionid.data,
379 NFS4_MAX_SESSIONID_LEN) != 0)
380 continue;
381
382 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
383 ref = &rclist->rcl_refcalls[j];
384
385 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
386 "slotid %u\n", __func__,
387 ((u32 *)&rclist->rcl_sessionid.data)[0],
388 ((u32 *)&rclist->rcl_sessionid.data)[1],
389 ((u32 *)&rclist->rcl_sessionid.data)[2],
390 ((u32 *)&rclist->rcl_sessionid.data)[3],
391 ref->rc_sequenceid, ref->rc_slotid);
392
393 spin_lock(&tbl->slot_tbl_lock);
394 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
395 tbl->slots[ref->rc_slotid].seq_nr ==
396 ref->rc_sequenceid);
397 spin_unlock(&tbl->slot_tbl_lock);
398 if (status)
399 goto out;
400 }
401 }
402
403out:
404 return status;
405}
406
407__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
408 struct cb_sequenceres *res,
409 struct cb_process_state *cps)
410{
411 struct nfs4_slot_table *tbl;
412 struct nfs_client *clp;
413 int i;
414 __be32 status = htonl(NFS4ERR_BADSESSION);
415
416 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
417 &args->csa_sessionid, cps->minorversion);
418 if (clp == NULL)
419 goto out;
420
421 tbl = &clp->cl_session->bc_slot_table;
422
423 spin_lock(&tbl->slot_tbl_lock);
424 /* state manager is resetting the session */
425 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
426 spin_unlock(&tbl->slot_tbl_lock);
427 status = htonl(NFS4ERR_DELAY);
428 /* Return NFS4ERR_BADSESSION if we're draining the session
429 * in order to reset it.
430 */
431 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
432 status = htonl(NFS4ERR_BADSESSION);
433 goto out;
434 }
435
436 status = validate_seqid(&clp->cl_session->bc_slot_table, args);
437 spin_unlock(&tbl->slot_tbl_lock);
438 if (status)
439 goto out;
440
441 cps->slotid = args->csa_slotid;
442
443 /*
444 * Check for pending referring calls. If a match is found, a
445 * related callback was received before the response to the original
446 * call.
447 */
448 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
449 status = htonl(NFS4ERR_DELAY);
450 goto out;
451 }
452
453 memcpy(&res->csr_sessionid, &args->csa_sessionid,
454 sizeof(res->csr_sessionid));
455 res->csr_sequenceid = args->csa_sequenceid;
456 res->csr_slotid = args->csa_slotid;
457 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
458 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
459
460out:
461 cps->clp = clp; /* put in nfs4_callback_compound */
462 for (i = 0; i < args->csa_nrclists; i++)
463 kfree(args->csa_rclists[i].rcl_refcalls);
464 kfree(args->csa_rclists);
465
466 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
467 cps->drc_status = status;
468 status = 0;
469 } else
470 res->csr_status = status;
471
472 trace_nfs4_cb_sequence(args, res, status);
473 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
474 ntohl(status), ntohl(res->csr_status));
475 return status;
476}
477
478static bool
479validate_bitmap_values(unsigned long mask)
480{
481 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
482}
483
484__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
485 struct cb_process_state *cps)
486{
487 __be32 status;
488 fmode_t flags = 0;
489
490 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
491 if (!cps->clp) /* set in cb_sequence */
492 goto out;
493
494 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
495 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
496
497 status = cpu_to_be32(NFS4ERR_INVAL);
498 if (!validate_bitmap_values(args->craa_type_mask))
499 goto out;
500
501 status = cpu_to_be32(NFS4_OK);
502 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
503 &args->craa_type_mask))
504 flags = FMODE_READ;
505 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
506 &args->craa_type_mask))
507 flags |= FMODE_WRITE;
508 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
509 &args->craa_type_mask))
510 pnfs_recall_all_layouts(cps->clp);
511 if (flags)
512 nfs_expire_unused_delegation_types(cps->clp, flags);
513out:
514 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
515 return status;
516}
517
518/* Reduce the fore channel's max_slots to the target value */
519__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
520 struct cb_process_state *cps)
521{
522 struct nfs4_slot_table *fc_tbl;
523 __be32 status;
524
525 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
526 if (!cps->clp) /* set in cb_sequence */
527 goto out;
528
529 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
530 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
531 args->crsa_target_highest_slotid);
532
533 fc_tbl = &cps->clp->cl_session->fc_slot_table;
534
535 status = htonl(NFS4_OK);
536
537 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
538 nfs41_server_notify_target_slotid_update(cps->clp);
539out:
540 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
541 return status;
542}
543#endif /* CONFIG_NFS_V4_1 */