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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 <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 */
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 */