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[linux-2.6/next.git] / fs / nfs / callback_proc.c
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1 /*
2 * linux/fs/nfs/callback_proc.c
4 * Copyright (C) 2004 Trond Myklebust
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"
17 #ifdef NFS_DEBUG
18 #define NFSDBG_FACILITY NFSDBG_CALLBACK
19 #endif
21 __be32 nfs4_callback_getattr(struct cb_getattrargs *args,
22 struct cb_getattrres *res,
23 struct cb_process_state *cps)
25 struct nfs_delegation *delegation;
26 struct nfs_inode *nfsi;
27 struct inode *inode;
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;
33 res->bitmap[0] = res->bitmap[1] = 0;
34 res->status = htonl(NFS4ERR_BADHANDLE);
36 dprintk("NFS: GETATTR callback request from %s\n",
37 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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;
58 out_iput:
59 rcu_read_unlock();
60 iput(inode);
61 out:
62 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
63 return res->status;
66 __be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
67 struct cb_process_state *cps)
69 struct inode *inode;
70 __be32 res;
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;
76 dprintk("NFS: RECALL callback request from %s\n",
77 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
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);
95 iput(inode);
96 out:
97 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
98 return res;
101 int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
103 if (delegation == NULL || memcmp(delegation->stateid.data, stateid->data,
104 sizeof(delegation->stateid.data)) != 0)
105 return 0;
106 return 1;
109 #if defined(CONFIG_NFS_V4_1)
111 static u32 initiate_file_draining(struct nfs_client *clp,
112 struct cb_layoutrecallargs *args)
114 struct pnfs_layout_hdr *lo;
115 struct inode *ino;
116 bool found = false;
117 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
118 LIST_HEAD(free_me_list);
120 spin_lock(&clp->cl_lock);
121 list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
122 if (nfs_compare_fh(&args->cbl_fh,
123 &NFS_I(lo->plh_inode)->fh))
124 continue;
125 ino = igrab(lo->plh_inode);
126 if (!ino)
127 continue;
128 found = true;
129 /* Without this, layout can be freed as soon
130 * as we release cl_lock.
132 get_layout_hdr(lo);
133 break;
135 spin_unlock(&clp->cl_lock);
136 if (!found)
137 return NFS4ERR_NOMATCHING_LAYOUT;
139 spin_lock(&ino->i_lock);
140 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
141 mark_matching_lsegs_invalid(lo, &free_me_list,
142 &args->cbl_range))
143 rv = NFS4ERR_DELAY;
144 else
145 rv = NFS4ERR_NOMATCHING_LAYOUT;
146 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
147 spin_unlock(&ino->i_lock);
148 pnfs_free_lseg_list(&free_me_list);
149 put_layout_hdr(lo);
150 iput(ino);
151 return rv;
154 static u32 initiate_bulk_draining(struct nfs_client *clp,
155 struct cb_layoutrecallargs *args)
157 struct pnfs_layout_hdr *lo;
158 struct inode *ino;
159 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
160 struct pnfs_layout_hdr *tmp;
161 LIST_HEAD(recall_list);
162 LIST_HEAD(free_me_list);
163 struct pnfs_layout_range range = {
164 .iomode = IOMODE_ANY,
165 .offset = 0,
166 .length = NFS4_MAX_UINT64,
169 spin_lock(&clp->cl_lock);
170 list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) {
171 if ((args->cbl_recall_type == RETURN_FSID) &&
172 memcmp(&NFS_SERVER(lo->plh_inode)->fsid,
173 &args->cbl_fsid, sizeof(struct nfs_fsid)))
174 continue;
175 if (!igrab(lo->plh_inode))
176 continue;
177 get_layout_hdr(lo);
178 BUG_ON(!list_empty(&lo->plh_bulk_recall));
179 list_add(&lo->plh_bulk_recall, &recall_list);
181 spin_unlock(&clp->cl_lock);
182 list_for_each_entry_safe(lo, tmp,
183 &recall_list, plh_bulk_recall) {
184 ino = lo->plh_inode;
185 spin_lock(&ino->i_lock);
186 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags);
187 if (mark_matching_lsegs_invalid(lo, &free_me_list, &range))
188 rv = NFS4ERR_DELAY;
189 list_del_init(&lo->plh_bulk_recall);
190 spin_unlock(&ino->i_lock);
191 pnfs_free_lseg_list(&free_me_list);
192 put_layout_hdr(lo);
193 iput(ino);
195 return rv;
198 static u32 do_callback_layoutrecall(struct nfs_client *clp,
199 struct cb_layoutrecallargs *args)
201 u32 res = NFS4ERR_DELAY;
203 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
204 if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state))
205 goto out;
206 if (args->cbl_recall_type == RETURN_FILE)
207 res = initiate_file_draining(clp, args);
208 else
209 res = initiate_bulk_draining(clp, args);
210 clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state);
211 out:
212 dprintk("%s returning %i\n", __func__, res);
213 return res;
217 __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
218 void *dummy, struct cb_process_state *cps)
220 u32 res;
222 dprintk("%s: -->\n", __func__);
224 if (cps->clp)
225 res = do_callback_layoutrecall(cps->clp, args);
226 else
227 res = NFS4ERR_OP_NOT_IN_SESSION;
229 dprintk("%s: exit with status = %d\n", __func__, res);
230 return cpu_to_be32(res);
233 static void pnfs_recall_all_layouts(struct nfs_client *clp)
235 struct cb_layoutrecallargs args;
237 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
238 memset(&args, 0, sizeof(args));
239 args.cbl_recall_type = RETURN_ALL;
240 /* FIXME we ignore errors, what should we do? */
241 do_callback_layoutrecall(clp, &args);
244 __be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
245 void *dummy, struct cb_process_state *cps)
247 int i;
248 __be32 res = 0;
249 struct nfs_client *clp = cps->clp;
250 struct nfs_server *server = NULL;
252 dprintk("%s: -->\n", __func__);
254 if (!clp) {
255 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
256 goto out;
259 for (i = 0; i < args->ndevs; i++) {
260 struct cb_devicenotifyitem *dev = &args->devs[i];
262 if (!server ||
263 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
264 rcu_read_lock();
265 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
266 if (server->pnfs_curr_ld &&
267 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
268 rcu_read_unlock();
269 goto found;
271 rcu_read_unlock();
272 dprintk("%s: layout type %u not found\n",
273 __func__, dev->cbd_layout_type);
274 continue;
277 found:
278 if (dev->cbd_notify_type == NOTIFY_DEVICEID4_CHANGE)
279 dprintk("%s: NOTIFY_DEVICEID4_CHANGE not supported, "
280 "deleting instead\n", __func__);
281 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
284 out:
285 kfree(args->devs);
286 dprintk("%s: exit with status = %u\n",
287 __func__, be32_to_cpu(res));
288 return res;
291 int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid)
293 if (delegation == NULL)
294 return 0;
296 if (stateid->stateid.seqid != 0)
297 return 0;
298 if (memcmp(&delegation->stateid.stateid.other,
299 &stateid->stateid.other,
300 NFS4_STATEID_OTHER_SIZE))
301 return 0;
303 return 1;
307 * Validate the sequenceID sent by the server.
308 * Return success if the sequenceID is one more than what we last saw on
309 * this slot, accounting for wraparound. Increments the slot's sequence.
311 * We don't yet implement a duplicate request cache, instead we set the
312 * back channel ca_maxresponsesize_cached to zero. This is OK for now
313 * since we only currently implement idempotent callbacks anyway.
315 * We have a single slot backchannel at this time, so we don't bother
316 * checking the used_slots bit array on the table. The lower layer guarantees
317 * a single outstanding callback request at a time.
319 static __be32
320 validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
322 struct nfs4_slot *slot;
324 dprintk("%s enter. slotid %d seqid %d\n",
325 __func__, args->csa_slotid, args->csa_sequenceid);
327 if (args->csa_slotid > NFS41_BC_MAX_CALLBACKS)
328 return htonl(NFS4ERR_BADSLOT);
330 slot = tbl->slots + args->csa_slotid;
331 dprintk("%s slot table seqid: %d\n", __func__, slot->seq_nr);
333 /* Normal */
334 if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
335 slot->seq_nr++;
336 return htonl(NFS4_OK);
339 /* Replay */
340 if (args->csa_sequenceid == slot->seq_nr) {
341 dprintk("%s seqid %d is a replay\n",
342 __func__, args->csa_sequenceid);
343 /* Signal process_op to set this error on next op */
344 if (args->csa_cachethis == 0)
345 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
347 /* The ca_maxresponsesize_cached is 0 with no DRC */
348 else if (args->csa_cachethis == 1)
349 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
352 /* Wraparound */
353 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
354 slot->seq_nr = 1;
355 return htonl(NFS4_OK);
358 /* Misordered request */
359 return htonl(NFS4ERR_SEQ_MISORDERED);
363 * For each referring call triple, check the session's slot table for
364 * a match. If the slot is in use and the sequence numbers match, the
365 * client is still waiting for a response to the original request.
367 static bool referring_call_exists(struct nfs_client *clp,
368 uint32_t nrclists,
369 struct referring_call_list *rclists)
371 bool status = 0;
372 int i, j;
373 struct nfs4_session *session;
374 struct nfs4_slot_table *tbl;
375 struct referring_call_list *rclist;
376 struct referring_call *ref;
379 * XXX When client trunking is implemented, this becomes
380 * a session lookup from within the loop
382 session = clp->cl_session;
383 tbl = &session->fc_slot_table;
385 for (i = 0; i < nrclists; i++) {
386 rclist = &rclists[i];
387 if (memcmp(session->sess_id.data,
388 rclist->rcl_sessionid.data,
389 NFS4_MAX_SESSIONID_LEN) != 0)
390 continue;
392 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
393 ref = &rclist->rcl_refcalls[j];
395 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
396 "slotid %u\n", __func__,
397 ((u32 *)&rclist->rcl_sessionid.data)[0],
398 ((u32 *)&rclist->rcl_sessionid.data)[1],
399 ((u32 *)&rclist->rcl_sessionid.data)[2],
400 ((u32 *)&rclist->rcl_sessionid.data)[3],
401 ref->rc_sequenceid, ref->rc_slotid);
403 spin_lock(&tbl->slot_tbl_lock);
404 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
405 tbl->slots[ref->rc_slotid].seq_nr ==
406 ref->rc_sequenceid);
407 spin_unlock(&tbl->slot_tbl_lock);
408 if (status)
409 goto out;
413 out:
414 return status;
417 __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
418 struct cb_sequenceres *res,
419 struct cb_process_state *cps)
421 struct nfs_client *clp;
422 int i;
423 __be32 status = htonl(NFS4ERR_BADSESSION);
425 cps->clp = NULL;
427 clp = nfs4_find_client_sessionid(args->csa_addr, &args->csa_sessionid);
428 if (clp == NULL)
429 goto out;
431 /* state manager is resetting the session */
432 if (test_bit(NFS4_SESSION_DRAINING, &clp->cl_session->session_state)) {
433 status = NFS4ERR_DELAY;
434 goto out;
437 status = validate_seqid(&clp->cl_session->bc_slot_table, args);
438 if (status)
439 goto out;
442 * Check for pending referring calls. If a match is found, a
443 * related callback was received before the response to the original
444 * call.
446 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
447 status = htonl(NFS4ERR_DELAY);
448 goto out;
451 memcpy(&res->csr_sessionid, &args->csa_sessionid,
452 sizeof(res->csr_sessionid));
453 res->csr_sequenceid = args->csa_sequenceid;
454 res->csr_slotid = args->csa_slotid;
455 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
456 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
457 nfs4_cb_take_slot(clp);
459 out:
460 cps->clp = clp; /* put in nfs4_callback_compound */
461 for (i = 0; i < args->csa_nrclists; i++)
462 kfree(args->csa_rclists[i].rcl_refcalls);
463 kfree(args->csa_rclists);
465 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
466 cps->drc_status = status;
467 status = 0;
468 } else
469 res->csr_status = status;
471 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
472 ntohl(status), ntohl(res->csr_status));
473 return status;
476 static bool
477 validate_bitmap_values(unsigned long mask)
479 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
482 __be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
483 struct cb_process_state *cps)
485 __be32 status;
486 fmode_t flags = 0;
488 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
489 if (!cps->clp) /* set in cb_sequence */
490 goto out;
492 dprintk("NFS: RECALL_ANY callback request from %s\n",
493 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
495 status = cpu_to_be32(NFS4ERR_INVAL);
496 if (!validate_bitmap_values(args->craa_type_mask))
497 goto out;
499 status = cpu_to_be32(NFS4_OK);
500 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
501 &args->craa_type_mask))
502 flags = FMODE_READ;
503 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
504 &args->craa_type_mask))
505 flags |= FMODE_WRITE;
506 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
507 &args->craa_type_mask))
508 pnfs_recall_all_layouts(cps->clp);
509 if (flags)
510 nfs_expire_all_delegation_types(cps->clp, flags);
511 out:
512 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
513 return status;
516 /* Reduce the fore channel's max_slots to the target value */
517 __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
518 struct cb_process_state *cps)
520 struct nfs4_slot_table *fc_tbl;
521 __be32 status;
523 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
524 if (!cps->clp) /* set in cb_sequence */
525 goto out;
527 dprintk("NFS: CB_RECALL_SLOT request from %s target max slots %d\n",
528 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
529 args->crsa_target_max_slots);
531 fc_tbl = &cps->clp->cl_session->fc_slot_table;
533 status = htonl(NFS4ERR_BAD_HIGH_SLOT);
534 if (args->crsa_target_max_slots > fc_tbl->max_slots ||
535 args->crsa_target_max_slots < 1)
536 goto out;
538 status = htonl(NFS4_OK);
539 if (args->crsa_target_max_slots == fc_tbl->max_slots)
540 goto out;
542 fc_tbl->target_max_slots = args->crsa_target_max_slots;
543 nfs41_handle_recall_slot(cps->clp);
544 out:
545 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
546 return status;
548 #endif /* CONFIG_NFS_V4_1 */