Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/nfs/nfs4state.c | |
3 | * | |
4 | * Client-side XDR for NFSv4. | |
5 | * | |
6 | * Copyright (c) 2002 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Kendrick Smith <kmsmith@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | * | |
36 | * Implementation of the NFSv4 state model. For the time being, | |
37 | * this is minimal, but will be made much more complex in a | |
38 | * subsequent patch. | |
39 | */ | |
40 | ||
6f43ddcc | 41 | #include <linux/kernel.h> |
1da177e4 | 42 | #include <linux/slab.h> |
b89f4321 | 43 | #include <linux/fs.h> |
1da177e4 LT |
44 | #include <linux/nfs_fs.h> |
45 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
46 | #include <linux/kthread.h> |
47 | #include <linux/module.h> | |
9f958ab8 | 48 | #include <linux/random.h> |
8c7597f6 | 49 | #include <linux/ratelimit.h> |
1da177e4 LT |
50 | #include <linux/workqueue.h> |
51 | #include <linux/bitops.h> | |
0aaaf5c4 | 52 | #include <linux/jiffies.h> |
1da177e4 | 53 | |
4ce79717 | 54 | #include "nfs4_fs.h" |
1da177e4 LT |
55 | #include "callback.h" |
56 | #include "delegation.h" | |
24c8dbbb | 57 | #include "internal.h" |
974cec8c | 58 | #include "pnfs.h" |
1da177e4 LT |
59 | |
60 | #define OPENOWNER_POOL_SIZE 8 | |
61 | ||
4ce79717 | 62 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
63 | |
64 | static LIST_HEAD(nfs4_clientid_list); | |
65 | ||
591d71cb | 66 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 67 | { |
fd954ae1 TM |
68 | struct nfs4_setclientid_res clid = { |
69 | .clientid = clp->cl_clientid, | |
70 | .confirm = clp->cl_confirm, | |
71 | }; | |
f738f517 CL |
72 | unsigned short port; |
73 | int status; | |
74 | ||
fd954ae1 TM |
75 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
76 | goto do_confirm; | |
f738f517 CL |
77 | port = nfs_callback_tcpport; |
78 | if (clp->cl_addr.ss_family == AF_INET6) | |
79 | port = nfs_callback_tcpport6; | |
80 | ||
bb8b27e5 TM |
81 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
82 | if (status != 0) | |
83 | goto out; | |
fd954ae1 TM |
84 | clp->cl_clientid = clid.clientid; |
85 | clp->cl_confirm = clid.confirm; | |
86 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
87 | do_confirm: | |
bb8b27e5 TM |
88 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); |
89 | if (status != 0) | |
90 | goto out; | |
fd954ae1 | 91 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
bb8b27e5 TM |
92 | nfs4_schedule_state_renewal(clp); |
93 | out: | |
1da177e4 LT |
94 | return status; |
95 | } | |
96 | ||
a7b72103 | 97 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
98 | { |
99 | struct rpc_cred *cred = NULL; | |
100 | ||
a2b2bb88 TM |
101 | if (clp->cl_machine_cred != NULL) |
102 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
103 | return cred; |
104 | } | |
105 | ||
106 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
107 | { | |
108 | struct rpc_cred *cred; | |
109 | ||
110 | spin_lock(&clp->cl_lock); | |
111 | cred = clp->cl_machine_cred; | |
112 | clp->cl_machine_cred = NULL; | |
113 | spin_unlock(&clp->cl_lock); | |
114 | if (cred != NULL) | |
115 | put_rpccred(cred); | |
116 | } | |
117 | ||
24d292b8 CL |
118 | static struct rpc_cred * |
119 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 120 | { |
24d292b8 | 121 | struct rpc_cred *cred = NULL; |
b4454fe1 | 122 | struct nfs4_state_owner *sp; |
9f958ab8 | 123 | struct rb_node *pos; |
b4454fe1 | 124 | |
24d292b8 CL |
125 | for (pos = rb_first(&server->state_owners); |
126 | pos != NULL; | |
127 | pos = rb_next(pos)) { | |
128 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
129 | if (list_empty(&sp->so_states)) |
130 | continue; | |
131 | cred = get_rpccred(sp->so_cred); | |
132 | break; | |
133 | } | |
134 | return cred; | |
135 | } | |
136 | ||
24d292b8 CL |
137 | /** |
138 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
139 | * @clp: client state handle | |
140 | * | |
141 | * Returns an rpc_cred with reference count bumped, or NULL. | |
142 | * Caller must hold clp->cl_lock. | |
143 | */ | |
144 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
145 | { | |
146 | struct rpc_cred *cred = NULL; | |
147 | struct nfs_server *server; | |
148 | ||
149 | rcu_read_lock(); | |
150 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
151 | cred = nfs4_get_renew_cred_server_locked(server); | |
152 | if (cred != NULL) | |
153 | break; | |
154 | } | |
155 | rcu_read_unlock(); | |
156 | return cred; | |
157 | } | |
158 | ||
b4b82607 AA |
159 | #if defined(CONFIG_NFS_V4_1) |
160 | ||
9430fb6b RL |
161 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
162 | { | |
163 | int status; | |
164 | struct nfs_fsinfo fsinfo; | |
165 | ||
d6fb79d4 AA |
166 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
167 | nfs4_schedule_state_renewal(clp); | |
168 | return 0; | |
169 | } | |
170 | ||
9430fb6b RL |
171 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
172 | if (status == 0) { | |
173 | /* Update lease time and schedule renewal */ | |
174 | spin_lock(&clp->cl_lock); | |
175 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
176 | clp->cl_last_renewal = jiffies; | |
177 | spin_unlock(&clp->cl_lock); | |
178 | ||
179 | nfs4_schedule_state_renewal(clp); | |
180 | } | |
181 | ||
182 | return status; | |
183 | } | |
184 | ||
42acd021 AA |
185 | /* |
186 | * Back channel returns NFS4ERR_DELAY for new requests when | |
187 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
188 | * is ended. | |
189 | */ | |
5601a00d | 190 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 191 | { |
5601a00d | 192 | struct nfs4_session *ses = clp->cl_session; |
689cf5c1 AB |
193 | int max_slots; |
194 | ||
a2118c33 TM |
195 | if (ses == NULL) |
196 | return; | |
197 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { | |
689cf5c1 AB |
198 | spin_lock(&ses->fc_slot_table.slot_tbl_lock); |
199 | max_slots = ses->fc_slot_table.max_slots; | |
200 | while (max_slots--) { | |
201 | struct rpc_task *task; | |
202 | ||
203 | task = rpc_wake_up_next(&ses->fc_slot_table. | |
204 | slot_tbl_waitq); | |
205 | if (!task) | |
206 | break; | |
207 | rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED); | |
208 | } | |
209 | spin_unlock(&ses->fc_slot_table.slot_tbl_lock); | |
210 | } | |
9dfdf404 RL |
211 | } |
212 | ||
42acd021 | 213 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 214 | { |
9dfdf404 | 215 | spin_lock(&tbl->slot_tbl_lock); |
9dfdf404 | 216 | if (tbl->highest_used_slotid != -1) { |
42acd021 | 217 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 218 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 219 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
220 | } |
221 | spin_unlock(&tbl->slot_tbl_lock); | |
222 | return 0; | |
223 | } | |
224 | ||
42acd021 AA |
225 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
226 | { | |
227 | struct nfs4_session *ses = clp->cl_session; | |
228 | int ret = 0; | |
229 | ||
230 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
231 | /* back channel */ | |
232 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
233 | if (ret) | |
234 | return ret; | |
235 | /* fore channel */ | |
236 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
237 | } | |
238 | ||
4d643d1d AA |
239 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
240 | { | |
241 | int status; | |
242 | ||
fd954ae1 TM |
243 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
244 | goto do_confirm; | |
38045412 | 245 | nfs4_begin_drain_session(clp); |
4d643d1d | 246 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
247 | if (status != 0) |
248 | goto out; | |
fd954ae1 TM |
249 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
250 | do_confirm: | |
9430fb6b RL |
251 | status = nfs4_proc_create_session(clp); |
252 | if (status != 0) | |
253 | goto out; | |
fd954ae1 | 254 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
9430fb6b RL |
255 | nfs41_setup_state_renewal(clp); |
256 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
257 | out: | |
4d643d1d AA |
258 | return status; |
259 | } | |
260 | ||
b4b82607 AA |
261 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
262 | { | |
263 | struct rpc_cred *cred; | |
264 | ||
265 | spin_lock(&clp->cl_lock); | |
266 | cred = nfs4_get_machine_cred_locked(clp); | |
267 | spin_unlock(&clp->cl_lock); | |
268 | return cred; | |
269 | } | |
270 | ||
271 | #endif /* CONFIG_NFS_V4_1 */ | |
272 | ||
24d292b8 CL |
273 | static struct rpc_cred * |
274 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 275 | { |
24d292b8 CL |
276 | struct nfs_client *clp = server->nfs_client; |
277 | struct rpc_cred *cred = NULL; | |
286d7d6a | 278 | struct nfs4_state_owner *sp; |
9f958ab8 | 279 | struct rb_node *pos; |
24d292b8 CL |
280 | |
281 | spin_lock(&clp->cl_lock); | |
282 | pos = rb_first(&server->state_owners); | |
283 | if (pos != NULL) { | |
284 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
285 | cred = get_rpccred(sp->so_cred); | |
286 | } | |
287 | spin_unlock(&clp->cl_lock); | |
288 | return cred; | |
289 | } | |
290 | ||
291 | /** | |
292 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
293 | * @clp: client state handle | |
294 | * | |
295 | * Returns an rpc_cred with reference count bumped, or NULL. | |
296 | */ | |
297 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
298 | { | |
299 | struct nfs_server *server; | |
a2b2bb88 | 300 | struct rpc_cred *cred; |
286d7d6a | 301 | |
6dc9d57a TM |
302 | spin_lock(&clp->cl_lock); |
303 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 304 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
305 | if (cred != NULL) |
306 | goto out; | |
24d292b8 CL |
307 | |
308 | rcu_read_lock(); | |
309 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
310 | cred = nfs4_get_setclientid_cred_server(server); | |
311 | if (cred != NULL) | |
312 | break; | |
286d7d6a | 313 | } |
24d292b8 CL |
314 | rcu_read_unlock(); |
315 | ||
a2b2bb88 TM |
316 | out: |
317 | return cred; | |
286d7d6a TM |
318 | } |
319 | ||
24d292b8 CL |
320 | static void nfs_alloc_unique_id_locked(struct rb_root *root, |
321 | struct nfs_unique_id *new, | |
322 | __u64 minval, int maxbits) | |
9f958ab8 TM |
323 | { |
324 | struct rb_node **p, *parent; | |
325 | struct nfs_unique_id *pos; | |
326 | __u64 mask = ~0ULL; | |
327 | ||
328 | if (maxbits < 64) | |
329 | mask = (1ULL << maxbits) - 1ULL; | |
330 | ||
331 | /* Ensure distribution is more or less flat */ | |
332 | get_random_bytes(&new->id, sizeof(new->id)); | |
333 | new->id &= mask; | |
334 | if (new->id < minval) | |
335 | new->id += minval; | |
336 | retry: | |
337 | p = &root->rb_node; | |
338 | parent = NULL; | |
339 | ||
340 | while (*p != NULL) { | |
341 | parent = *p; | |
342 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
343 | ||
344 | if (new->id < pos->id) | |
345 | p = &(*p)->rb_left; | |
346 | else if (new->id > pos->id) | |
347 | p = &(*p)->rb_right; | |
348 | else | |
349 | goto id_exists; | |
350 | } | |
351 | rb_link_node(&new->rb_node, parent, p); | |
352 | rb_insert_color(&new->rb_node, root); | |
353 | return; | |
354 | id_exists: | |
355 | for (;;) { | |
356 | new->id++; | |
357 | if (new->id < minval || (new->id & mask) != new->id) { | |
358 | new->id = minval; | |
359 | break; | |
360 | } | |
361 | parent = rb_next(parent); | |
362 | if (parent == NULL) | |
363 | break; | |
364 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); | |
365 | if (new->id < pos->id) | |
366 | break; | |
367 | } | |
368 | goto retry; | |
369 | } | |
370 | ||
371 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) | |
372 | { | |
373 | rb_erase(&id->rb_node, root); | |
374 | } | |
375 | ||
1da177e4 | 376 | static struct nfs4_state_owner * |
24d292b8 | 377 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 378 | { |
24d292b8 | 379 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 380 | *parent = NULL; |
414adf14 | 381 | struct nfs4_state_owner *sp; |
1da177e4 | 382 | |
9f958ab8 TM |
383 | while (*p != NULL) { |
384 | parent = *p; | |
24d292b8 | 385 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
386 | |
387 | if (cred < sp->so_cred) | |
388 | p = &parent->rb_left; | |
389 | else if (cred > sp->so_cred) | |
390 | p = &parent->rb_right; | |
391 | else { | |
0aaaf5c4 CL |
392 | if (!list_empty(&sp->so_lru)) |
393 | list_del_init(&sp->so_lru); | |
9f958ab8 | 394 | atomic_inc(&sp->so_count); |
414adf14 | 395 | return sp; |
9f958ab8 | 396 | } |
1da177e4 | 397 | } |
414adf14 | 398 | return NULL; |
1da177e4 LT |
399 | } |
400 | ||
9f958ab8 | 401 | static struct nfs4_state_owner * |
24d292b8 | 402 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 403 | { |
24d292b8 CL |
404 | struct nfs_server *server = new->so_server; |
405 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
406 | *parent = NULL; |
407 | struct nfs4_state_owner *sp; | |
408 | ||
409 | while (*p != NULL) { | |
410 | parent = *p; | |
24d292b8 | 411 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
412 | |
413 | if (new->so_cred < sp->so_cred) | |
414 | p = &parent->rb_left; | |
415 | else if (new->so_cred > sp->so_cred) | |
416 | p = &parent->rb_right; | |
417 | else { | |
0aaaf5c4 CL |
418 | if (!list_empty(&sp->so_lru)) |
419 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
420 | atomic_inc(&sp->so_count); |
421 | return sp; | |
422 | } | |
423 | } | |
24d292b8 CL |
424 | nfs_alloc_unique_id_locked(&server->openowner_id, |
425 | &new->so_owner_id, 1, 64); | |
426 | rb_link_node(&new->so_server_node, parent, p); | |
427 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
428 | return new; |
429 | } | |
430 | ||
431 | static void | |
24d292b8 | 432 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 433 | { |
24d292b8 CL |
434 | struct nfs_server *server = sp->so_server; |
435 | ||
436 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
437 | rb_erase(&sp->so_server_node, &server->state_owners); | |
438 | nfs_free_unique_id(&server->openowner_id, &sp->so_owner_id); | |
9f958ab8 TM |
439 | } |
440 | ||
1da177e4 LT |
441 | /* |
442 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
443 | * create a new state_owner. | |
444 | * | |
445 | */ | |
446 | static struct nfs4_state_owner * | |
d1e284d5 TM |
447 | nfs4_alloc_state_owner(struct nfs_server *server, |
448 | struct rpc_cred *cred, | |
449 | gfp_t gfp_flags) | |
1da177e4 LT |
450 | { |
451 | struct nfs4_state_owner *sp; | |
452 | ||
d1e284d5 | 453 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
454 | if (!sp) |
455 | return NULL; | |
d1e284d5 TM |
456 | sp->so_server = server; |
457 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 458 | spin_lock_init(&sp->so_lock); |
1da177e4 | 459 | INIT_LIST_HEAD(&sp->so_states); |
cee54fc9 TM |
460 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
461 | sp->so_seqid.sequence = &sp->so_sequence; | |
462 | spin_lock_init(&sp->so_sequence.lock); | |
463 | INIT_LIST_HEAD(&sp->so_sequence.list); | |
1da177e4 | 464 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 465 | INIT_LIST_HEAD(&sp->so_lru); |
1da177e4 LT |
466 | return sp; |
467 | } | |
468 | ||
1d2e88e7 | 469 | static void |
1da177e4 LT |
470 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
471 | { | |
24d292b8 CL |
472 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { |
473 | struct nfs_server *server = sp->so_server; | |
474 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
475 | |
476 | spin_lock(&clp->cl_lock); | |
24d292b8 CL |
477 | rb_erase(&sp->so_server_node, &server->state_owners); |
478 | RB_CLEAR_NODE(&sp->so_server_node); | |
9f958ab8 TM |
479 | spin_unlock(&clp->cl_lock); |
480 | } | |
1da177e4 LT |
481 | } |
482 | ||
0aaaf5c4 CL |
483 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
484 | { | |
485 | rpc_destroy_wait_queue(&sp->so_sequence.wait); | |
486 | put_rpccred(sp->so_cred); | |
487 | kfree(sp); | |
488 | } | |
489 | ||
490 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
491 | { | |
492 | struct nfs_client *clp = server->nfs_client; | |
493 | struct nfs4_state_owner *sp, *tmp; | |
494 | unsigned long time_min, time_max; | |
495 | LIST_HEAD(doomed); | |
496 | ||
497 | spin_lock(&clp->cl_lock); | |
498 | time_max = jiffies; | |
499 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
500 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
501 | /* NB: LRU is sorted so that oldest is at the head */ | |
502 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
503 | break; | |
504 | list_move(&sp->so_lru, &doomed); | |
505 | nfs4_remove_state_owner_locked(sp); | |
506 | } | |
507 | spin_unlock(&clp->cl_lock); | |
508 | ||
509 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
510 | list_del(&sp->so_lru); | |
511 | nfs4_free_state_owner(sp); | |
512 | } | |
513 | } | |
514 | ||
24d292b8 CL |
515 | /** |
516 | * nfs4_get_state_owner - Look up a state owner given a credential | |
517 | * @server: nfs_server to search | |
518 | * @cred: RPC credential to match | |
519 | * | |
520 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
521 | */ | |
522 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
523 | struct rpc_cred *cred, |
524 | gfp_t gfp_flags) | |
1da177e4 | 525 | { |
7539bbab | 526 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
527 | struct nfs4_state_owner *sp, *new; |
528 | ||
1da177e4 | 529 | spin_lock(&clp->cl_lock); |
24d292b8 | 530 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 531 | spin_unlock(&clp->cl_lock); |
1da177e4 | 532 | if (sp != NULL) |
0aaaf5c4 | 533 | goto out; |
d1e284d5 | 534 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 535 | if (new == NULL) |
0aaaf5c4 | 536 | goto out; |
24d292b8 | 537 | sp = nfs4_insert_state_owner_locked(new); |
9f958ab8 | 538 | spin_unlock(&clp->cl_lock); |
d1e284d5 TM |
539 | if (sp != new) |
540 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
541 | out: |
542 | nfs4_gc_state_owners(server); | |
9f958ab8 | 543 | return sp; |
1da177e4 LT |
544 | } |
545 | ||
24d292b8 CL |
546 | /** |
547 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
548 | * @sp: state owner data to release | |
24d292b8 | 549 | */ |
1da177e4 LT |
550 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
551 | { | |
0aaaf5c4 CL |
552 | struct nfs_server *server = sp->so_server; |
553 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
554 | |
555 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
556 | return; | |
0aaaf5c4 CL |
557 | |
558 | if (!RB_EMPTY_NODE(&sp->so_server_node)) { | |
559 | sp->so_expires = jiffies; | |
560 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
561 | spin_unlock(&clp->cl_lock); | |
562 | } else { | |
563 | nfs4_remove_state_owner_locked(sp); | |
564 | spin_unlock(&clp->cl_lock); | |
565 | nfs4_free_state_owner(sp); | |
566 | } | |
567 | } | |
568 | ||
569 | /** | |
570 | * nfs4_purge_state_owners - Release all cached state owners | |
571 | * @server: nfs_server with cached state owners to release | |
572 | * | |
573 | * Called at umount time. Remaining state owners will be on | |
574 | * the LRU with ref count of zero. | |
575 | */ | |
576 | void nfs4_purge_state_owners(struct nfs_server *server) | |
577 | { | |
578 | struct nfs_client *clp = server->nfs_client; | |
579 | struct nfs4_state_owner *sp, *tmp; | |
580 | LIST_HEAD(doomed); | |
581 | ||
582 | spin_lock(&clp->cl_lock); | |
583 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
584 | list_move(&sp->so_lru, &doomed); | |
585 | nfs4_remove_state_owner_locked(sp); | |
586 | } | |
1da177e4 | 587 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
588 | |
589 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
590 | list_del(&sp->so_lru); | |
591 | nfs4_free_state_owner(sp); | |
592 | } | |
1da177e4 LT |
593 | } |
594 | ||
595 | static struct nfs4_state * | |
596 | nfs4_alloc_open_state(void) | |
597 | { | |
598 | struct nfs4_state *state; | |
599 | ||
8535b2be | 600 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
601 | if (!state) |
602 | return NULL; | |
1da177e4 LT |
603 | atomic_set(&state->count, 1); |
604 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 605 | spin_lock_init(&state->state_lock); |
8bda4e4c | 606 | seqlock_init(&state->seqlock); |
1da177e4 LT |
607 | return state; |
608 | } | |
609 | ||
4cecb76f | 610 | void |
dc0b027d | 611 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 612 | { |
dc0b027d | 613 | if (state->state == fmode) |
4cecb76f TM |
614 | return; |
615 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
616 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
617 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
618 | list_move(&state->open_states, &state->owner->so_states); |
619 | else | |
620 | list_move_tail(&state->open_states, &state->owner->so_states); | |
621 | } | |
dc0b027d | 622 | state->state = fmode; |
4cecb76f TM |
623 | } |
624 | ||
1da177e4 LT |
625 | static struct nfs4_state * |
626 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
627 | { | |
628 | struct nfs_inode *nfsi = NFS_I(inode); | |
629 | struct nfs4_state *state; | |
630 | ||
631 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 632 | if (state->owner != owner) |
1da177e4 | 633 | continue; |
1c816efa | 634 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 635 | return state; |
1da177e4 LT |
636 | } |
637 | return NULL; | |
638 | } | |
639 | ||
1da177e4 LT |
640 | static void |
641 | nfs4_free_open_state(struct nfs4_state *state) | |
642 | { | |
643 | kfree(state); | |
644 | } | |
645 | ||
646 | struct nfs4_state * | |
647 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
648 | { | |
649 | struct nfs4_state *state, *new; | |
650 | struct nfs_inode *nfsi = NFS_I(inode); | |
651 | ||
652 | spin_lock(&inode->i_lock); | |
653 | state = __nfs4_find_state_byowner(inode, owner); | |
654 | spin_unlock(&inode->i_lock); | |
655 | if (state) | |
656 | goto out; | |
657 | new = nfs4_alloc_open_state(); | |
ec073428 | 658 | spin_lock(&owner->so_lock); |
1da177e4 LT |
659 | spin_lock(&inode->i_lock); |
660 | state = __nfs4_find_state_byowner(inode, owner); | |
661 | if (state == NULL && new != NULL) { | |
662 | state = new; | |
1da177e4 LT |
663 | state->owner = owner; |
664 | atomic_inc(&owner->so_count); | |
665 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
666 | ihold(inode); |
667 | state->inode = inode; | |
1da177e4 | 668 | spin_unlock(&inode->i_lock); |
ec073428 TM |
669 | /* Note: The reclaim code dictates that we add stateless |
670 | * and read-only stateids to the end of the list */ | |
671 | list_add_tail(&state->open_states, &owner->so_states); | |
672 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
673 | } else { |
674 | spin_unlock(&inode->i_lock); | |
ec073428 | 675 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
676 | if (new) |
677 | nfs4_free_open_state(new); | |
678 | } | |
679 | out: | |
680 | return state; | |
681 | } | |
682 | ||
1da177e4 LT |
683 | void nfs4_put_open_state(struct nfs4_state *state) |
684 | { | |
685 | struct inode *inode = state->inode; | |
686 | struct nfs4_state_owner *owner = state->owner; | |
687 | ||
ec073428 | 688 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 689 | return; |
ec073428 | 690 | spin_lock(&inode->i_lock); |
ba683031 | 691 | list_del(&state->inode_states); |
1da177e4 | 692 | list_del(&state->open_states); |
ec073428 TM |
693 | spin_unlock(&inode->i_lock); |
694 | spin_unlock(&owner->so_lock); | |
1da177e4 | 695 | iput(inode); |
1da177e4 LT |
696 | nfs4_free_open_state(state); |
697 | nfs4_put_state_owner(owner); | |
698 | } | |
699 | ||
700 | /* | |
83c9d41e | 701 | * Close the current file. |
1da177e4 | 702 | */ |
643168c2 | 703 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 704 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 705 | { |
1da177e4 | 706 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 707 | int call_close = 0; |
dc0b027d | 708 | fmode_t newstate; |
1da177e4 LT |
709 | |
710 | atomic_inc(&owner->so_count); | |
1da177e4 | 711 | /* Protect against nfs4_find_state() */ |
ec073428 | 712 | spin_lock(&owner->so_lock); |
dc0b027d | 713 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
714 | case FMODE_READ: |
715 | state->n_rdonly--; | |
716 | break; | |
717 | case FMODE_WRITE: | |
718 | state->n_wronly--; | |
719 | break; | |
720 | case FMODE_READ|FMODE_WRITE: | |
721 | state->n_rdwr--; | |
722 | } | |
003707c7 | 723 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 724 | if (state->n_rdwr == 0) { |
003707c7 | 725 | if (state->n_rdonly == 0) { |
e7616923 | 726 | newstate &= ~FMODE_READ; |
003707c7 TM |
727 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
728 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
729 | } | |
730 | if (state->n_wronly == 0) { | |
e7616923 | 731 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
732 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
733 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
734 | } | |
735 | if (newstate == 0) | |
736 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 737 | } |
003707c7 | 738 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 739 | spin_unlock(&owner->so_lock); |
4cecb76f | 740 | |
003707c7 | 741 | if (!call_close) { |
b39e625b TM |
742 | nfs4_put_open_state(state); |
743 | nfs4_put_state_owner(owner); | |
f7e8917a FI |
744 | } else { |
745 | bool roc = pnfs_roc(state->inode); | |
746 | ||
643168c2 | 747 | nfs4_do_close(state, gfp_mask, wait, roc); |
f7e8917a | 748 | } |
a49c3c77 TM |
749 | } |
750 | ||
643168c2 | 751 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 752 | { |
643168c2 | 753 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
754 | } |
755 | ||
643168c2 | 756 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 757 | { |
643168c2 | 758 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
759 | } |
760 | ||
761 | /* | |
762 | * Search the state->lock_states for an existing lock_owner | |
763 | * that is compatible with current->files | |
764 | */ | |
765 | static struct nfs4_lock_state * | |
77041ed9 | 766 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
767 | { |
768 | struct nfs4_lock_state *pos; | |
769 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 770 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 771 | continue; |
77041ed9 TM |
772 | switch (pos->ls_owner.lo_type) { |
773 | case NFS4_POSIX_LOCK_TYPE: | |
774 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
775 | continue; | |
776 | break; | |
777 | case NFS4_FLOCK_LOCK_TYPE: | |
778 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
779 | continue; | |
780 | } | |
1da177e4 LT |
781 | atomic_inc(&pos->ls_count); |
782 | return pos; | |
783 | } | |
784 | return NULL; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | /* |
788 | * Return a compatible lock_state. If no initialized lock_state structure | |
789 | * exists, return an uninitialized one. | |
790 | * | |
1da177e4 | 791 | */ |
77041ed9 | 792 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
793 | { |
794 | struct nfs4_lock_state *lsp; | |
24d292b8 CL |
795 | struct nfs_server *server = state->owner->so_server; |
796 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 | 797 | |
8535b2be | 798 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
799 | if (lsp == NULL) |
800 | return NULL; | |
d0dc3701 TM |
801 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
802 | spin_lock_init(&lsp->ls_sequence.lock); | |
803 | INIT_LIST_HEAD(&lsp->ls_sequence.list); | |
804 | lsp->ls_seqid.sequence = &lsp->ls_sequence; | |
1da177e4 | 805 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 806 | lsp->ls_state = state; |
77041ed9 TM |
807 | lsp->ls_owner.lo_type = type; |
808 | switch (lsp->ls_owner.lo_type) { | |
809 | case NFS4_FLOCK_LOCK_TYPE: | |
810 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
811 | break; | |
812 | case NFS4_POSIX_LOCK_TYPE: | |
813 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
814 | break; | |
815 | default: | |
816 | kfree(lsp); | |
817 | return NULL; | |
818 | } | |
1da177e4 | 819 | spin_lock(&clp->cl_lock); |
24d292b8 | 820 | nfs_alloc_unique_id_locked(&server->lockowner_id, &lsp->ls_id, 1, 64); |
1da177e4 | 821 | spin_unlock(&clp->cl_lock); |
8d0a8a9d | 822 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 LT |
823 | return lsp; |
824 | } | |
825 | ||
9f958ab8 TM |
826 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
827 | { | |
24d292b8 CL |
828 | struct nfs_server *server = lsp->ls_state->owner->so_server; |
829 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
830 | |
831 | spin_lock(&clp->cl_lock); | |
24d292b8 | 832 | nfs_free_unique_id(&server->lockowner_id, &lsp->ls_id); |
9f958ab8 | 833 | spin_unlock(&clp->cl_lock); |
f6a1cc89 | 834 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
9f958ab8 TM |
835 | kfree(lsp); |
836 | } | |
837 | ||
1da177e4 LT |
838 | /* |
839 | * Return a compatible lock_state. If no initialized lock_state structure | |
840 | * exists, return an uninitialized one. | |
841 | * | |
1da177e4 | 842 | */ |
77041ed9 | 843 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 844 | { |
8d0a8a9d | 845 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 846 | |
8d0a8a9d TM |
847 | for(;;) { |
848 | spin_lock(&state->state_lock); | |
77041ed9 | 849 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
850 | if (lsp != NULL) |
851 | break; | |
852 | if (new != NULL) { | |
8d0a8a9d TM |
853 | list_add(&new->ls_locks, &state->lock_states); |
854 | set_bit(LK_STATE_IN_USE, &state->flags); | |
855 | lsp = new; | |
856 | new = NULL; | |
857 | break; | |
858 | } | |
859 | spin_unlock(&state->state_lock); | |
77041ed9 | 860 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
861 | if (new == NULL) |
862 | return NULL; | |
863 | } | |
864 | spin_unlock(&state->state_lock); | |
9f958ab8 TM |
865 | if (new != NULL) |
866 | nfs4_free_lock_state(new); | |
1da177e4 LT |
867 | return lsp; |
868 | } | |
869 | ||
870 | /* | |
8d0a8a9d TM |
871 | * Release reference to lock_state, and free it if we see that |
872 | * it is no longer in use | |
1da177e4 | 873 | */ |
faf5f49c | 874 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 875 | { |
8d0a8a9d | 876 | struct nfs4_state *state; |
1da177e4 | 877 | |
8d0a8a9d TM |
878 | if (lsp == NULL) |
879 | return; | |
880 | state = lsp->ls_state; | |
881 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
882 | return; | |
883 | list_del(&lsp->ls_locks); | |
884 | if (list_empty(&state->lock_states)) | |
885 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
886 | spin_unlock(&state->state_lock); | |
d3c7b7cc TM |
887 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) |
888 | nfs4_release_lockowner(lsp); | |
9f958ab8 | 889 | nfs4_free_lock_state(lsp); |
1da177e4 LT |
890 | } |
891 | ||
8d0a8a9d | 892 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 893 | { |
8d0a8a9d | 894 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 895 | |
8d0a8a9d TM |
896 | dst->fl_u.nfs4_fl.owner = lsp; |
897 | atomic_inc(&lsp->ls_count); | |
898 | } | |
1da177e4 | 899 | |
8d0a8a9d | 900 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 901 | { |
8d0a8a9d | 902 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
903 | } |
904 | ||
6aed6285 | 905 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
906 | .fl_copy_lock = nfs4_fl_copy_lock, |
907 | .fl_release_private = nfs4_fl_release_lock, | |
908 | }; | |
909 | ||
910 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 911 | { |
8d0a8a9d TM |
912 | struct nfs4_lock_state *lsp; |
913 | ||
914 | if (fl->fl_ops != NULL) | |
915 | return 0; | |
77041ed9 TM |
916 | if (fl->fl_flags & FL_POSIX) |
917 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
918 | else if (fl->fl_flags & FL_FLOCK) | |
919 | lsp = nfs4_get_lock_state(state, 0, fl->fl_pid, NFS4_FLOCK_LOCK_TYPE); | |
920 | else | |
921 | return -EINVAL; | |
8d0a8a9d TM |
922 | if (lsp == NULL) |
923 | return -ENOMEM; | |
924 | fl->fl_u.nfs4_fl.owner = lsp; | |
925 | fl->fl_ops = &nfs4_fl_lock_ops; | |
926 | return 0; | |
1da177e4 LT |
927 | } |
928 | ||
8d0a8a9d TM |
929 | /* |
930 | * Byte-range lock aware utility to initialize the stateid of read/write | |
931 | * requests. | |
1da177e4 | 932 | */ |
77041ed9 | 933 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid) |
1da177e4 | 934 | { |
8d0a8a9d | 935 | struct nfs4_lock_state *lsp; |
8bda4e4c | 936 | int seq; |
1da177e4 | 937 | |
8bda4e4c TM |
938 | do { |
939 | seq = read_seqbegin(&state->seqlock); | |
940 | memcpy(dst, &state->stateid, sizeof(*dst)); | |
941 | } while (read_seqretry(&state->seqlock, seq)); | |
8d0a8a9d TM |
942 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
943 | return; | |
1da177e4 | 944 | |
8d0a8a9d | 945 | spin_lock(&state->state_lock); |
77041ed9 | 946 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
8d0a8a9d TM |
947 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
948 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); | |
949 | spin_unlock(&state->state_lock); | |
1da177e4 LT |
950 | nfs4_put_lock_state(lsp); |
951 | } | |
952 | ||
8535b2be | 953 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 954 | { |
cee54fc9 TM |
955 | struct nfs_seqid *new; |
956 | ||
8535b2be | 957 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
958 | if (new != NULL) { |
959 | new->sequence = counter; | |
2f74c0a0 | 960 | INIT_LIST_HEAD(&new->list); |
cee54fc9 TM |
961 | } |
962 | return new; | |
963 | } | |
964 | ||
72211dbe | 965 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 966 | { |
2f74c0a0 TM |
967 | if (!list_empty(&seqid->list)) { |
968 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
cee54fc9 | 969 | |
2f74c0a0 | 970 | spin_lock(&sequence->lock); |
72211dbe | 971 | list_del_init(&seqid->list); |
2f74c0a0 TM |
972 | spin_unlock(&sequence->lock); |
973 | rpc_wake_up(&sequence->wait); | |
974 | } | |
72211dbe TM |
975 | } |
976 | ||
977 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
978 | { | |
979 | nfs_release_seqid(seqid); | |
cee54fc9 | 980 | kfree(seqid); |
1da177e4 LT |
981 | } |
982 | ||
983 | /* | |
cee54fc9 TM |
984 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
985 | * failed with a seqid incrementing error - | |
986 | * see comments nfs_fs.h:seqid_mutating_error() | |
987 | */ | |
88d90939 | 988 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 989 | { |
2f74c0a0 | 990 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
991 | switch (status) { |
992 | case 0: | |
993 | break; | |
994 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
995 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
996 | return; | |
997 | printk(KERN_WARNING "NFS: v4 server returned a bad" | |
497799e7 DM |
998 | " sequence-id error on an" |
999 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1000 | seqid->sequence); |
cee54fc9 TM |
1001 | case -NFS4ERR_STALE_CLIENTID: |
1002 | case -NFS4ERR_STALE_STATEID: | |
1003 | case -NFS4ERR_BAD_STATEID: | |
1004 | case -NFS4ERR_BADXDR: | |
1005 | case -NFS4ERR_RESOURCE: | |
1006 | case -NFS4ERR_NOFILEHANDLE: | |
1007 | /* Non-seqid mutating errors */ | |
1008 | return; | |
1009 | }; | |
1010 | /* | |
1011 | * Note: no locking needed as we are guaranteed to be first | |
1012 | * on the sequence list | |
1013 | */ | |
1014 | seqid->sequence->counter++; | |
1015 | } | |
1016 | ||
1017 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1018 | { | |
34dc1ad7 BH |
1019 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1020 | struct nfs4_state_owner, so_seqid); | |
1021 | struct nfs_server *server = sp->so_server; | |
1022 | ||
1023 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1024 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1025 | if (!nfs4_has_session(server->nfs_client)) |
1026 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1027 | } |
1028 | ||
1029 | /* | |
cee54fc9 TM |
1030 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1031 | * failed with a seqid incrementing error - | |
1032 | * see comments nfs_fs.h:seqid_mutating_error() | |
1033 | */ | |
1034 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1035 | { | |
88d90939 | 1036 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1037 | } |
1038 | ||
1039 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1040 | { | |
1041 | struct rpc_sequence *sequence = seqid->sequence->sequence; | |
1042 | int status = 0; | |
1043 | ||
1044 | spin_lock(&sequence->lock); | |
2f74c0a0 TM |
1045 | if (list_empty(&seqid->list)) |
1046 | list_add_tail(&seqid->list, &sequence->list); | |
1047 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1048 | goto unlock; | |
5d00837b | 1049 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1050 | status = -EAGAIN; |
1051 | unlock: | |
cee54fc9 TM |
1052 | spin_unlock(&sequence->lock); |
1053 | return status; | |
1da177e4 LT |
1054 | } |
1055 | ||
e005e804 | 1056 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1057 | |
e005e804 | 1058 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1059 | { |
1060 | smp_mb__before_clear_bit(); | |
e005e804 | 1061 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1062 | smp_mb__after_clear_bit(); |
e005e804 | 1063 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1064 | rpc_wake_up(&clp->cl_rpcwaitq); |
1065 | } | |
1066 | ||
1da177e4 | 1067 | /* |
e005e804 | 1068 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1069 | */ |
b0d3ded1 | 1070 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1071 | { |
5043e900 | 1072 | struct task_struct *task; |
1da177e4 | 1073 | |
e005e804 TM |
1074 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1075 | return; | |
5043e900 TM |
1076 | __module_get(THIS_MODULE); |
1077 | atomic_inc(&clp->cl_count); | |
e005e804 | 1078 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
5d8515ca CL |
1079 | rpc_peeraddr2str(clp->cl_rpcclient, |
1080 | RPC_DISPLAY_ADDR)); | |
5043e900 TM |
1081 | if (!IS_ERR(task)) |
1082 | return; | |
e005e804 | 1083 | nfs4_clear_state_manager_bit(clp); |
24c8dbbb | 1084 | nfs_put_client(clp); |
5043e900 | 1085 | module_put(THIS_MODULE); |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | /* | |
0400a6b0 | 1089 | * Schedule a lease recovery attempt |
1da177e4 | 1090 | */ |
0400a6b0 | 1091 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1092 | { |
1093 | if (!clp) | |
1094 | return; | |
e598d843 TM |
1095 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1096 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 1097 | nfs4_schedule_state_manager(clp); |
1da177e4 LT |
1098 | } |
1099 | ||
042b60be TM |
1100 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1101 | { | |
1102 | nfs_handle_cb_pathdown(clp); | |
1103 | nfs4_schedule_state_manager(clp); | |
1104 | } | |
1105 | ||
f9feab1e | 1106 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1107 | { |
1108 | ||
1109 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1110 | /* Don't recover state that expired before the reboot */ | |
1111 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1112 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1113 | return 0; | |
1114 | } | |
7eff03ae | 1115 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1116 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1117 | return 1; | |
1118 | } | |
1119 | ||
f9feab1e | 1120 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1121 | { |
1122 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1123 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1124 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1125 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1126 | return 1; | |
1127 | } | |
1128 | ||
0400a6b0 TM |
1129 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
1130 | { | |
1131 | struct nfs_client *clp = server->nfs_client; | |
1132 | ||
1133 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1134 | nfs4_schedule_state_manager(clp); | |
1135 | } | |
1136 | ||
02860014 | 1137 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1138 | { |
1139 | struct inode *inode = state->inode; | |
19e03c57 | 1140 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1141 | struct file_lock *fl; |
1142 | int status = 0; | |
1143 | ||
3f09df70 TM |
1144 | if (inode->i_flock == NULL) |
1145 | return 0; | |
1146 | ||
1147 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1148 | down_write(&nfsi->rwsem); |
3f09df70 | 1149 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1150 | lock_flocks(); |
90dc7d27 | 1151 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1152 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1153 | continue; |
cd3758e3 | 1154 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1155 | continue; |
b89f4321 | 1156 | unlock_flocks(); |
1da177e4 | 1157 | status = ops->recover_lock(state, fl); |
1da177e4 | 1158 | switch (status) { |
965b5d67 TM |
1159 | case 0: |
1160 | break; | |
1161 | case -ESTALE: | |
1162 | case -NFS4ERR_ADMIN_REVOKED: | |
1163 | case -NFS4ERR_STALE_STATEID: | |
1164 | case -NFS4ERR_BAD_STATEID: | |
1165 | case -NFS4ERR_EXPIRED: | |
1166 | case -NFS4ERR_NO_GRACE: | |
1167 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1168 | case -NFS4ERR_BADSESSION: |
1169 | case -NFS4ERR_BADSLOT: | |
1170 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1171 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1172 | goto out; |
1da177e4 LT |
1173 | default: |
1174 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1175 | __func__, status); |
965b5d67 TM |
1176 | case -ENOMEM: |
1177 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1178 | case -NFS4ERR_RECLAIM_BAD: |
1179 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1180 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1181 | status = 0; |
1da177e4 | 1182 | } |
b89f4321 | 1183 | lock_flocks(); |
1da177e4 | 1184 | } |
b89f4321 | 1185 | unlock_flocks(); |
965b5d67 | 1186 | out: |
19e03c57 | 1187 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1188 | return status; |
1189 | } | |
1190 | ||
02860014 | 1191 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1192 | { |
1193 | struct nfs4_state *state; | |
1194 | struct nfs4_lock_state *lock; | |
1195 | int status = 0; | |
1196 | ||
1197 | /* Note: we rely on the sp->so_states list being ordered | |
1198 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1199 | * states first. | |
1200 | * This is needed to ensure that the server won't give us any | |
1201 | * read delegations that we have to return if, say, we are | |
1202 | * recovering after a network partition or a reboot from a | |
1203 | * server that doesn't support a grace period. | |
1204 | */ | |
fe1d8195 TM |
1205 | restart: |
1206 | spin_lock(&sp->so_lock); | |
1da177e4 | 1207 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1208 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1209 | continue; | |
1da177e4 LT |
1210 | if (state->state == 0) |
1211 | continue; | |
fe1d8195 TM |
1212 | atomic_inc(&state->count); |
1213 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1214 | status = ops->recover_open(sp, state); |
1da177e4 | 1215 | if (status >= 0) { |
02860014 TM |
1216 | status = nfs4_reclaim_locks(state, ops); |
1217 | if (status >= 0) { | |
4b44b40e | 1218 | spin_lock(&state->state_lock); |
02860014 TM |
1219 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
1220 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
1221 | printk("%s: Lock reclaim failed!\n", | |
3110ff80 | 1222 | __func__); |
02860014 | 1223 | } |
4b44b40e | 1224 | spin_unlock(&state->state_lock); |
fe1d8195 TM |
1225 | nfs4_put_open_state(state); |
1226 | goto restart; | |
1da177e4 | 1227 | } |
1da177e4 LT |
1228 | } |
1229 | switch (status) { | |
1230 | default: | |
1231 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", | |
3110ff80 | 1232 | __func__, status); |
1da177e4 | 1233 | case -ENOENT: |
965b5d67 | 1234 | case -ENOMEM: |
b79a4a1b | 1235 | case -ESTALE: |
1da177e4 LT |
1236 | /* |
1237 | * Open state on this file cannot be recovered | |
1238 | * All we can do is revert to using the zero stateid. | |
1239 | */ | |
1240 | memset(state->stateid.data, 0, | |
1241 | sizeof(state->stateid.data)); | |
1242 | /* Mark the file as being 'closed' */ | |
1243 | state->state = 0; | |
1244 | break; | |
168667c4 TM |
1245 | case -EKEYEXPIRED: |
1246 | /* | |
1247 | * User RPCSEC_GSS context has expired. | |
1248 | * We cannot recover this stateid now, so | |
1249 | * skip it and allow recovery thread to | |
1250 | * proceed. | |
1251 | */ | |
1252 | break; | |
965b5d67 TM |
1253 | case -NFS4ERR_ADMIN_REVOKED: |
1254 | case -NFS4ERR_STALE_STATEID: | |
1255 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1256 | case -NFS4ERR_RECLAIM_BAD: |
1257 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1258 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1259 | break; |
1da177e4 LT |
1260 | case -NFS4ERR_EXPIRED: |
1261 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1262 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1263 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1264 | case -NFS4ERR_BADSESSION: |
1265 | case -NFS4ERR_BADSLOT: | |
1266 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1267 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1268 | goto out_err; |
1269 | } | |
fe1d8195 TM |
1270 | nfs4_put_open_state(state); |
1271 | goto restart; | |
1da177e4 | 1272 | } |
fe1d8195 | 1273 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1274 | return 0; |
1275 | out_err: | |
fe1d8195 | 1276 | nfs4_put_open_state(state); |
1da177e4 LT |
1277 | return status; |
1278 | } | |
1279 | ||
b79a4a1b TM |
1280 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1281 | { | |
1282 | struct nfs4_lock_state *lock; | |
1283 | ||
1284 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1285 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1286 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1287 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1288 | spin_lock(&state->state_lock); |
b79a4a1b | 1289 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b TM |
1290 | lock->ls_seqid.flags = 0; |
1291 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1292 | } | |
4b44b40e | 1293 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1294 | } |
1295 | ||
24d292b8 CL |
1296 | static void nfs4_reset_seqids(struct nfs_server *server, |
1297 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1298 | { |
24d292b8 | 1299 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1300 | struct nfs4_state_owner *sp; |
9f958ab8 | 1301 | struct rb_node *pos; |
cee54fc9 | 1302 | struct nfs4_state *state; |
cee54fc9 | 1303 | |
24d292b8 CL |
1304 | spin_lock(&clp->cl_lock); |
1305 | for (pos = rb_first(&server->state_owners); | |
1306 | pos != NULL; | |
1307 | pos = rb_next(pos)) { | |
1308 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1309 | sp->so_seqid.flags = 0; |
ec073428 | 1310 | spin_lock(&sp->so_lock); |
cee54fc9 | 1311 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1312 | if (mark_reclaim(clp, state)) |
1313 | nfs4_clear_open_state(state); | |
cee54fc9 | 1314 | } |
ec073428 | 1315 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1316 | } |
24d292b8 CL |
1317 | spin_unlock(&clp->cl_lock); |
1318 | } | |
1319 | ||
1320 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1321 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1322 | { | |
1323 | struct nfs_server *server; | |
1324 | ||
1325 | rcu_read_lock(); | |
1326 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1327 | nfs4_reset_seqids(server, mark_reclaim); | |
1328 | rcu_read_unlock(); | |
cee54fc9 TM |
1329 | } |
1330 | ||
b79a4a1b TM |
1331 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1332 | { | |
1333 | /* Mark all delegations for reclaim */ | |
1334 | nfs_delegation_mark_reclaim(clp); | |
1335 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1336 | } | |
1337 | ||
fce5c838 RL |
1338 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1339 | const struct nfs4_state_recovery_ops *ops) | |
1340 | { | |
1341 | /* Notify the server we're done reclaiming our state */ | |
1342 | if (ops->reclaim_complete) | |
1343 | (void)ops->reclaim_complete(clp); | |
1344 | } | |
1345 | ||
24d292b8 | 1346 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1347 | { |
24d292b8 | 1348 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1349 | struct nfs4_state_owner *sp; |
1350 | struct rb_node *pos; | |
1351 | struct nfs4_state *state; | |
1352 | ||
24d292b8 CL |
1353 | spin_lock(&clp->cl_lock); |
1354 | for (pos = rb_first(&server->state_owners); | |
1355 | pos != NULL; | |
1356 | pos = rb_next(pos)) { | |
1357 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1358 | spin_lock(&sp->so_lock); |
1359 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1360 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1361 | &state->flags)) | |
b79a4a1b TM |
1362 | continue; |
1363 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1364 | } | |
1365 | spin_unlock(&sp->so_lock); | |
1366 | } | |
24d292b8 CL |
1367 | spin_unlock(&clp->cl_lock); |
1368 | } | |
1369 | ||
1370 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1371 | { | |
1372 | struct nfs_server *server; | |
1373 | ||
1374 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1375 | return 0; | |
1376 | ||
1377 | rcu_read_lock(); | |
1378 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1379 | nfs4_clear_reclaim_server(server); | |
1380 | rcu_read_unlock(); | |
b79a4a1b TM |
1381 | |
1382 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1383 | return 1; |
1384 | } | |
1385 | ||
1386 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1387 | { | |
1388 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1389 | return; | |
1390 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
b79a4a1b TM |
1391 | } |
1392 | ||
1393 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1394 | { | |
1395 | nfs_delegation_mark_reclaim(clp); | |
1396 | nfs_delegation_reap_unclaimed(clp); | |
1397 | } | |
1398 | ||
1399 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1400 | { | |
1401 | nfs_delegation_clear_all(clp); | |
1402 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1403 | } | |
1404 | ||
168667c4 TM |
1405 | static void nfs4_warn_keyexpired(const char *s) |
1406 | { | |
1407 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1408 | " encountered RPCSEC_GSS session" | |
1409 | " expired against NFSv4 server %s.\n", | |
1410 | s); | |
1411 | } | |
1412 | ||
4f7cdf18 | 1413 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1414 | { |
1415 | switch (error) { | |
4f38e4aa TM |
1416 | case 0: |
1417 | break; | |
e598d843 | 1418 | case -NFS4ERR_CB_PATH_DOWN: |
707fb4b3 | 1419 | nfs_handle_cb_pathdown(clp); |
4f38e4aa | 1420 | break; |
c8b7ae3d TM |
1421 | case -NFS4ERR_NO_GRACE: |
1422 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1423 | break; |
e598d843 TM |
1424 | case -NFS4ERR_STALE_CLIENTID: |
1425 | case -NFS4ERR_LEASE_MOVED: | |
1426 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1427 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1428 | nfs4_state_start_reclaim_reboot(clp); |
1429 | break; | |
1430 | case -NFS4ERR_EXPIRED: | |
1431 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1432 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1433 | break; |
c3fad1b1 AA |
1434 | case -NFS4ERR_BADSESSION: |
1435 | case -NFS4ERR_BADSLOT: | |
1436 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1437 | case -NFS4ERR_DEADSESSION: | |
1438 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1439 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1440 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1441 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1442 | /* Zero session reset errors */ |
4f38e4aa | 1443 | break; |
168667c4 TM |
1444 | case -EKEYEXPIRED: |
1445 | /* Nothing we can do */ | |
1446 | nfs4_warn_keyexpired(clp->cl_hostname); | |
4f38e4aa TM |
1447 | break; |
1448 | default: | |
1449 | return error; | |
e598d843 | 1450 | } |
4f38e4aa | 1451 | return 0; |
e598d843 TM |
1452 | } |
1453 | ||
02860014 | 1454 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1455 | { |
24d292b8 CL |
1456 | struct nfs4_state_owner *sp; |
1457 | struct nfs_server *server; | |
9f958ab8 | 1458 | struct rb_node *pos; |
1da177e4 LT |
1459 | int status = 0; |
1460 | ||
7eff03ae | 1461 | restart: |
24d292b8 CL |
1462 | rcu_read_lock(); |
1463 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1464 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1465 | spin_lock(&clp->cl_lock); |
1466 | for (pos = rb_first(&server->state_owners); | |
1467 | pos != NULL; | |
1468 | pos = rb_next(pos)) { | |
1469 | sp = rb_entry(pos, | |
1470 | struct nfs4_state_owner, so_server_node); | |
1471 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1472 | &sp->so_flags)) | |
1473 | continue; | |
1474 | atomic_inc(&sp->so_count); | |
1475 | spin_unlock(&clp->cl_lock); | |
1476 | rcu_read_unlock(); | |
1477 | ||
1478 | status = nfs4_reclaim_open_state(sp, ops); | |
1479 | if (status < 0) { | |
1480 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1481 | nfs4_put_state_owner(sp); | |
1482 | return nfs4_recovery_handle_error(clp, status); | |
1483 | } | |
1484 | ||
7eff03ae | 1485 | nfs4_put_state_owner(sp); |
24d292b8 | 1486 | goto restart; |
7eff03ae | 1487 | } |
24d292b8 | 1488 | spin_unlock(&clp->cl_lock); |
02860014 | 1489 | } |
24d292b8 | 1490 | rcu_read_unlock(); |
02860014 TM |
1491 | return status; |
1492 | } | |
1493 | ||
1494 | static int nfs4_check_lease(struct nfs_client *clp) | |
1495 | { | |
1496 | struct rpc_cred *cred; | |
c48f4f35 TM |
1497 | const struct nfs4_state_maintenance_ops *ops = |
1498 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1499 | int status; |
1da177e4 | 1500 | |
0f605b56 TM |
1501 | /* Is the client already known to have an expired lease? */ |
1502 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1503 | return 0; | |
a7b72103 AA |
1504 | spin_lock(&clp->cl_lock); |
1505 | cred = ops->get_state_renewal_cred_locked(clp); | |
1506 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1507 | if (cred == NULL) { |
1508 | cred = nfs4_get_setclientid_cred(clp); | |
4f38e4aa | 1509 | status = -ENOKEY; |
0f605b56 TM |
1510 | if (cred == NULL) |
1511 | goto out; | |
286d7d6a | 1512 | } |
8e69514f | 1513 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1514 | put_rpccred(cred); |
1515 | out: | |
4f7cdf18 | 1516 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1517 | } |
1518 | ||
1519 | static int nfs4_reclaim_lease(struct nfs_client *clp) | |
1520 | { | |
1521 | struct rpc_cred *cred; | |
c48f4f35 TM |
1522 | const struct nfs4_state_recovery_ops *ops = |
1523 | clp->cl_mvops->reboot_recovery_ops; | |
02860014 TM |
1524 | int status = -ENOENT; |
1525 | ||
90a16617 | 1526 | cred = ops->get_clid_cred(clp); |
286d7d6a | 1527 | if (cred != NULL) { |
591d71cb | 1528 | status = ops->establish_clid(clp, cred); |
286d7d6a | 1529 | put_rpccred(cred); |
a2b2bb88 TM |
1530 | /* Handle case where the user hasn't set up machine creds */ |
1531 | if (status == -EACCES && cred == clp->cl_machine_cred) { | |
1532 | nfs4_clear_machine_cred(clp); | |
02860014 | 1533 | status = -EAGAIN; |
a2b2bb88 | 1534 | } |
c2e713dd BH |
1535 | if (status == -NFS4ERR_MINOR_VERS_MISMATCH) |
1536 | status = -EPROTONOSUPPORT; | |
286d7d6a | 1537 | } |
02860014 TM |
1538 | return status; |
1539 | } | |
1540 | ||
76db6d95 | 1541 | #ifdef CONFIG_NFS_V4_1 |
0400a6b0 TM |
1542 | void nfs4_schedule_session_recovery(struct nfs4_session *session) |
1543 | { | |
444f72fe TM |
1544 | struct nfs_client *clp = session->clp; |
1545 | ||
1546 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1547 | nfs4_schedule_lease_recovery(clp); | |
0400a6b0 | 1548 | } |
cbdabc7f | 1549 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1550 | |
b9efa1b2 AA |
1551 | void nfs41_handle_recall_slot(struct nfs_client *clp) |
1552 | { | |
1553 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
0400a6b0 | 1554 | nfs4_schedule_state_manager(clp); |
b9efa1b2 AA |
1555 | } |
1556 | ||
0f79fd6f TM |
1557 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1558 | { | |
1559 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1560 | clp->cl_boot_time = CURRENT_TIME; | |
1561 | nfs4_state_start_reclaim_nograce(clp); | |
0400a6b0 | 1562 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1563 | } |
1564 | } | |
1565 | ||
1566 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1567 | { | |
1568 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1569 | nfs4_state_start_reclaim_reboot(clp); | |
0400a6b0 | 1570 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1571 | } |
1572 | } | |
1573 | ||
1574 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1575 | { | |
1576 | /* Temporary */ | |
1577 | nfs4_reset_all_state(clp); | |
1578 | } | |
1579 | ||
1580 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1581 | { | |
1582 | /* This will need to handle layouts too */ | |
1583 | nfs_expire_all_delegations(clp); | |
1584 | } | |
1585 | ||
1586 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) | |
1587 | { | |
1588 | nfs_expire_all_delegations(clp); | |
1589 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1590 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1591 | } |
1592 | ||
0629e370 AB |
1593 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1594 | { | |
1595 | if (!flags) | |
1596 | return; | |
111d489f | 1597 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 1598 | nfs41_handle_server_reboot(clp); |
111d489f | 1599 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
1600 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
1601 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
1602 | SEQ4_STATUS_LEASE_MOVED)) |
1603 | nfs41_handle_state_revoked(clp); | |
111d489f | 1604 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 1605 | nfs41_handle_recallable_state_revoked(clp); |
111d489f | 1606 | if (flags & (SEQ4_STATUS_CB_PATH_DOWN | |
0629e370 AB |
1607 | SEQ4_STATUS_BACKCHANNEL_FAULT | |
1608 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 1609 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
1610 | } |
1611 | ||
c3fad1b1 AA |
1612 | static int nfs4_reset_session(struct nfs_client *clp) |
1613 | { | |
1614 | int status; | |
1615 | ||
38045412 | 1616 | nfs4_begin_drain_session(clp); |
c3fad1b1 AA |
1617 | status = nfs4_proc_destroy_session(clp->cl_session); |
1618 | if (status && status != -NFS4ERR_BADSESSION && | |
1619 | status != -NFS4ERR_DEADSESSION) { | |
f455848a | 1620 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
1621 | goto out; |
1622 | } | |
1623 | ||
1624 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
f26468fb | 1625 | status = nfs4_proc_create_session(clp); |
41f54a55 | 1626 | if (status) { |
f455848a | 1627 | status = nfs4_recovery_handle_error(clp, status); |
41f54a55 AA |
1628 | goto out; |
1629 | } | |
444f72fe | 1630 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
41f54a55 AA |
1631 | /* create_session negotiated new slot table */ |
1632 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
9dfdf404 | 1633 | |
41f54a55 AA |
1634 | /* Let the state manager reestablish state */ |
1635 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
5601a00d | 1636 | nfs41_setup_state_renewal(clp); |
41f54a55 | 1637 | out: |
c3fad1b1 AA |
1638 | return status; |
1639 | } | |
76db6d95 | 1640 | |
b9efa1b2 AA |
1641 | static int nfs4_recall_slot(struct nfs_client *clp) |
1642 | { | |
1643 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1644 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1645 | struct nfs4_slot *new, *old; | |
1646 | int i; | |
1647 | ||
1648 | nfs4_begin_drain_session(clp); | |
1649 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
8535b2be | 1650 | GFP_NOFS); |
b9efa1b2 AA |
1651 | if (!new) |
1652 | return -ENOMEM; | |
1653 | ||
1654 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1655 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1656 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1657 | old = fc_tbl->slots; | |
1658 | fc_tbl->slots = new; | |
1659 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1660 | fc_tbl->target_max_slots = 0; | |
1661 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1662 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1663 | ||
1664 | kfree(old); | |
1665 | nfs4_end_drain_session(clp); | |
1666 | return 0; | |
1667 | } | |
1668 | ||
76db6d95 | 1669 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1670 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 1671 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
b9efa1b2 | 1672 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } |
76db6d95 AA |
1673 | #endif /* CONFIG_NFS_V4_1 */ |
1674 | ||
78722e9c AA |
1675 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1676 | * on EXCHANGE_ID for v4.1 | |
1677 | */ | |
1678 | static void nfs4_set_lease_expired(struct nfs_client *clp, int status) | |
1679 | { | |
fd954ae1 TM |
1680 | switch (status) { |
1681 | case -NFS4ERR_CLID_INUSE: | |
1682 | case -NFS4ERR_STALE_CLIENTID: | |
1683 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1684 | break; | |
1685 | case -NFS4ERR_DELAY: | |
1bd714f2 | 1686 | case -ETIMEDOUT: |
fd954ae1 TM |
1687 | case -EAGAIN: |
1688 | ssleep(1); | |
1689 | break; | |
78722e9c | 1690 | |
fd954ae1 TM |
1691 | case -EKEYEXPIRED: |
1692 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1693 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1694 | * in nfs4_exchange_id */ | |
1695 | default: | |
1696 | return; | |
78722e9c AA |
1697 | } |
1698 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1699 | } | |
1700 | ||
e005e804 | 1701 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1702 | { |
02860014 TM |
1703 | int status = 0; |
1704 | ||
02860014 | 1705 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 1706 | do { |
b79a4a1b TM |
1707 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1708 | /* We're going to have to re-establish a clientid */ | |
1709 | status = nfs4_reclaim_lease(clp); | |
1710 | if (status) { | |
78722e9c | 1711 | nfs4_set_lease_expired(clp, status); |
b6d408ba TM |
1712 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, |
1713 | &clp->cl_state)) | |
b79a4a1b | 1714 | continue; |
76db6d95 AA |
1715 | if (clp->cl_cons_state == |
1716 | NFS_CS_SESSION_INITING) | |
1717 | nfs_mark_client_ready(clp, status); | |
b79a4a1b TM |
1718 | goto out_error; |
1719 | } | |
e598d843 | 1720 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
78fe0f41 WAA |
1721 | |
1722 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, | |
1723 | &clp->cl_state)) | |
1724 | nfs4_state_start_reclaim_nograce(clp); | |
1725 | else | |
1726 | set_bit(NFS4CLNT_RECLAIM_REBOOT, | |
1727 | &clp->cl_state); | |
1728 | ||
974cec8c | 1729 | pnfs_destroy_all_layouts(clp); |
e598d843 TM |
1730 | } |
1731 | ||
1732 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1733 | status = nfs4_check_lease(clp); | |
4f38e4aa TM |
1734 | if (status < 0) |
1735 | goto out_error; | |
b6d408ba | 1736 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1737 | continue; |
b79a4a1b | 1738 | } |
b6d408ba | 1739 | |
c3fad1b1 | 1740 | /* Initialize or reset the session */ |
6df08189 | 1741 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1742 | && nfs4_has_session(clp)) { |
4d643d1d | 1743 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1744 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1745 | continue; | |
1746 | if (status < 0) | |
76db6d95 | 1747 | goto out_error; |
76db6d95 | 1748 | } |
b6d408ba | 1749 | |
b79a4a1b | 1750 | /* First recover reboot state... */ |
e345e88a | 1751 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb | 1752 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1753 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 1754 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1755 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1756 | continue; |
b79a4a1b | 1757 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1758 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1759 | continue; | |
1760 | if (status < 0) | |
1761 | goto out_error; | |
02860014 TM |
1762 | } |
1763 | ||
b79a4a1b TM |
1764 | /* Now recover expired state... */ |
1765 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb | 1766 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1767 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 1768 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1769 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1770 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1771 | continue; | |
1772 | if (status < 0) | |
b79a4a1b | 1773 | goto out_error; |
1da177e4 | 1774 | } |
707fb4b3 | 1775 | |
5601a00d | 1776 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
1777 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1778 | nfs_client_return_marked_delegations(clp); | |
1779 | continue; | |
1780 | } | |
b9efa1b2 AA |
1781 | /* Recall session slots */ |
1782 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1783 | && nfs4_has_session(clp)) { | |
1784 | status = nfs4_recall_slot(clp); | |
1785 | if (status < 0) | |
1786 | goto out_error; | |
1787 | continue; | |
1788 | } | |
1789 | ||
e005e804 TM |
1790 | |
1791 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1792 | /* Did we race with an attempt to give us more work? */ |
1793 | if (clp->cl_state == 0) | |
1794 | break; | |
1795 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1796 | break; | |
47c2199b | 1797 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 1798 | return; |
1da177e4 | 1799 | out_error: |
e005e804 | 1800 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
5d8515ca | 1801 | " with error %d\n", clp->cl_hostname, -status); |
5601a00d | 1802 | nfs4_end_drain_session(clp); |
e005e804 TM |
1803 | nfs4_clear_state_manager_bit(clp); |
1804 | } | |
1805 | ||
1806 | static int nfs4_run_state_manager(void *ptr) | |
1807 | { | |
1808 | struct nfs_client *clp = ptr; | |
1809 | ||
1810 | allow_signal(SIGKILL); | |
1811 | nfs4_state_manager(clp); | |
1812 | nfs_put_client(clp); | |
1813 | module_put_and_exit(0); | |
1814 | return 0; | |
1da177e4 LT |
1815 | } |
1816 | ||
1817 | /* | |
1818 | * Local variables: | |
1819 | * c-basic-offset: 8 | |
1820 | * End: | |
1821 | */ |