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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 | 59 | |
e3c0fb7e CL |
60 | #define NFSDBG_FACILITY NFSDBG_STATE |
61 | ||
1da177e4 LT |
62 | #define OPENOWNER_POOL_SIZE 8 |
63 | ||
4ce79717 | 64 | const nfs4_stateid zero_stateid; |
1da177e4 LT |
65 | |
66 | static LIST_HEAD(nfs4_clientid_list); | |
67 | ||
591d71cb | 68 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 69 | { |
fd954ae1 TM |
70 | struct nfs4_setclientid_res clid = { |
71 | .clientid = clp->cl_clientid, | |
72 | .confirm = clp->cl_confirm, | |
73 | }; | |
f738f517 CL |
74 | unsigned short port; |
75 | int status; | |
76 | ||
fd954ae1 TM |
77 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
78 | goto do_confirm; | |
f738f517 CL |
79 | port = nfs_callback_tcpport; |
80 | if (clp->cl_addr.ss_family == AF_INET6) | |
81 | port = nfs_callback_tcpport6; | |
82 | ||
bb8b27e5 TM |
83 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
84 | if (status != 0) | |
85 | goto out; | |
fd954ae1 TM |
86 | clp->cl_clientid = clid.clientid; |
87 | clp->cl_confirm = clid.confirm; | |
88 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
89 | do_confirm: | |
bb8b27e5 TM |
90 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); |
91 | if (status != 0) | |
92 | goto out; | |
fd954ae1 | 93 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
bb8b27e5 TM |
94 | nfs4_schedule_state_renewal(clp); |
95 | out: | |
1da177e4 LT |
96 | return status; |
97 | } | |
98 | ||
a7b72103 | 99 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
100 | { |
101 | struct rpc_cred *cred = NULL; | |
102 | ||
a2b2bb88 TM |
103 | if (clp->cl_machine_cred != NULL) |
104 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
105 | return cred; |
106 | } | |
107 | ||
108 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
109 | { | |
110 | struct rpc_cred *cred; | |
111 | ||
112 | spin_lock(&clp->cl_lock); | |
113 | cred = clp->cl_machine_cred; | |
114 | clp->cl_machine_cred = NULL; | |
115 | spin_unlock(&clp->cl_lock); | |
116 | if (cred != NULL) | |
117 | put_rpccred(cred); | |
118 | } | |
119 | ||
24d292b8 CL |
120 | static struct rpc_cred * |
121 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 122 | { |
24d292b8 | 123 | struct rpc_cred *cred = NULL; |
b4454fe1 | 124 | struct nfs4_state_owner *sp; |
9f958ab8 | 125 | struct rb_node *pos; |
b4454fe1 | 126 | |
24d292b8 CL |
127 | for (pos = rb_first(&server->state_owners); |
128 | pos != NULL; | |
129 | pos = rb_next(pos)) { | |
130 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
131 | if (list_empty(&sp->so_states)) |
132 | continue; | |
133 | cred = get_rpccred(sp->so_cred); | |
134 | break; | |
135 | } | |
136 | return cred; | |
137 | } | |
138 | ||
24d292b8 CL |
139 | /** |
140 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
141 | * @clp: client state handle | |
142 | * | |
143 | * Returns an rpc_cred with reference count bumped, or NULL. | |
144 | * Caller must hold clp->cl_lock. | |
145 | */ | |
146 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
147 | { | |
148 | struct rpc_cred *cred = NULL; | |
149 | struct nfs_server *server; | |
150 | ||
e49a29bd SP |
151 | /* Use machine credentials if available */ |
152 | cred = nfs4_get_machine_cred_locked(clp); | |
153 | if (cred != NULL) | |
154 | goto out; | |
155 | ||
24d292b8 CL |
156 | rcu_read_lock(); |
157 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
158 | cred = nfs4_get_renew_cred_server_locked(server); | |
159 | if (cred != NULL) | |
160 | break; | |
161 | } | |
162 | rcu_read_unlock(); | |
e49a29bd SP |
163 | |
164 | out: | |
24d292b8 CL |
165 | return cred; |
166 | } | |
167 | ||
b4b82607 AA |
168 | #if defined(CONFIG_NFS_V4_1) |
169 | ||
9430fb6b RL |
170 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
171 | { | |
172 | int status; | |
173 | struct nfs_fsinfo fsinfo; | |
174 | ||
d6fb79d4 AA |
175 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
176 | nfs4_schedule_state_renewal(clp); | |
177 | return 0; | |
178 | } | |
179 | ||
9430fb6b RL |
180 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
181 | if (status == 0) { | |
182 | /* Update lease time and schedule renewal */ | |
183 | spin_lock(&clp->cl_lock); | |
184 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
185 | clp->cl_last_renewal = jiffies; | |
186 | spin_unlock(&clp->cl_lock); | |
187 | ||
188 | nfs4_schedule_state_renewal(clp); | |
189 | } | |
190 | ||
191 | return status; | |
192 | } | |
193 | ||
42acd021 AA |
194 | /* |
195 | * Back channel returns NFS4ERR_DELAY for new requests when | |
196 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
197 | * is ended. | |
198 | */ | |
5601a00d | 199 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 200 | { |
5601a00d | 201 | struct nfs4_session *ses = clp->cl_session; |
961a828d | 202 | struct nfs4_slot_table *tbl; |
689cf5c1 AB |
203 | int max_slots; |
204 | ||
a2118c33 TM |
205 | if (ses == NULL) |
206 | return; | |
961a828d | 207 | tbl = &ses->fc_slot_table; |
a2118c33 | 208 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { |
961a828d TM |
209 | spin_lock(&tbl->slot_tbl_lock); |
210 | max_slots = tbl->max_slots; | |
689cf5c1 | 211 | while (max_slots--) { |
961a828d TM |
212 | if (rpc_wake_up_first(&tbl->slot_tbl_waitq, |
213 | nfs4_set_task_privileged, | |
214 | NULL) == NULL) | |
689cf5c1 | 215 | break; |
689cf5c1 | 216 | } |
961a828d | 217 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 218 | } |
9dfdf404 RL |
219 | } |
220 | ||
42acd021 | 221 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 222 | { |
9dfdf404 | 223 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 224 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 225 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 226 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 227 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
228 | } |
229 | spin_unlock(&tbl->slot_tbl_lock); | |
230 | return 0; | |
231 | } | |
232 | ||
42acd021 AA |
233 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
234 | { | |
235 | struct nfs4_session *ses = clp->cl_session; | |
236 | int ret = 0; | |
237 | ||
238 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
239 | /* back channel */ | |
240 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
241 | if (ret) | |
242 | return ret; | |
243 | /* fore channel */ | |
244 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
245 | } | |
246 | ||
4d643d1d AA |
247 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
248 | { | |
249 | int status; | |
250 | ||
fd954ae1 TM |
251 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
252 | goto do_confirm; | |
38045412 | 253 | nfs4_begin_drain_session(clp); |
4d643d1d | 254 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
255 | if (status != 0) |
256 | goto out; | |
fd954ae1 TM |
257 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
258 | do_confirm: | |
848f5bda | 259 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
260 | if (status != 0) |
261 | goto out; | |
fd954ae1 | 262 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
9430fb6b RL |
263 | nfs41_setup_state_renewal(clp); |
264 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
265 | out: | |
4d643d1d AA |
266 | return status; |
267 | } | |
268 | ||
b4b82607 AA |
269 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
270 | { | |
271 | struct rpc_cred *cred; | |
272 | ||
273 | spin_lock(&clp->cl_lock); | |
274 | cred = nfs4_get_machine_cred_locked(clp); | |
275 | spin_unlock(&clp->cl_lock); | |
276 | return cred; | |
277 | } | |
278 | ||
279 | #endif /* CONFIG_NFS_V4_1 */ | |
280 | ||
24d292b8 CL |
281 | static struct rpc_cred * |
282 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 283 | { |
24d292b8 CL |
284 | struct nfs_client *clp = server->nfs_client; |
285 | struct rpc_cred *cred = NULL; | |
286d7d6a | 286 | struct nfs4_state_owner *sp; |
9f958ab8 | 287 | struct rb_node *pos; |
24d292b8 CL |
288 | |
289 | spin_lock(&clp->cl_lock); | |
290 | pos = rb_first(&server->state_owners); | |
291 | if (pos != NULL) { | |
292 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
293 | cred = get_rpccred(sp->so_cred); | |
294 | } | |
295 | spin_unlock(&clp->cl_lock); | |
296 | return cred; | |
297 | } | |
298 | ||
299 | /** | |
300 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
301 | * @clp: client state handle | |
302 | * | |
303 | * Returns an rpc_cred with reference count bumped, or NULL. | |
304 | */ | |
305 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
306 | { | |
307 | struct nfs_server *server; | |
a2b2bb88 | 308 | struct rpc_cred *cred; |
286d7d6a | 309 | |
6dc9d57a TM |
310 | spin_lock(&clp->cl_lock); |
311 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 312 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
313 | if (cred != NULL) |
314 | goto out; | |
24d292b8 CL |
315 | |
316 | rcu_read_lock(); | |
317 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
318 | cred = nfs4_get_setclientid_cred_server(server); | |
319 | if (cred != NULL) | |
320 | break; | |
286d7d6a | 321 | } |
24d292b8 CL |
322 | rcu_read_unlock(); |
323 | ||
a2b2bb88 TM |
324 | out: |
325 | return cred; | |
286d7d6a TM |
326 | } |
327 | ||
1da177e4 | 328 | static struct nfs4_state_owner * |
24d292b8 | 329 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 330 | { |
24d292b8 | 331 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 332 | *parent = NULL; |
414adf14 | 333 | struct nfs4_state_owner *sp; |
1da177e4 | 334 | |
9f958ab8 TM |
335 | while (*p != NULL) { |
336 | parent = *p; | |
24d292b8 | 337 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
338 | |
339 | if (cred < sp->so_cred) | |
340 | p = &parent->rb_left; | |
341 | else if (cred > sp->so_cred) | |
342 | p = &parent->rb_right; | |
343 | else { | |
0aaaf5c4 CL |
344 | if (!list_empty(&sp->so_lru)) |
345 | list_del_init(&sp->so_lru); | |
9f958ab8 | 346 | atomic_inc(&sp->so_count); |
414adf14 | 347 | return sp; |
9f958ab8 | 348 | } |
1da177e4 | 349 | } |
414adf14 | 350 | return NULL; |
1da177e4 LT |
351 | } |
352 | ||
9f958ab8 | 353 | static struct nfs4_state_owner * |
24d292b8 | 354 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 355 | { |
24d292b8 CL |
356 | struct nfs_server *server = new->so_server; |
357 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
358 | *parent = NULL; |
359 | struct nfs4_state_owner *sp; | |
9157c31d | 360 | int err; |
9f958ab8 TM |
361 | |
362 | while (*p != NULL) { | |
363 | parent = *p; | |
24d292b8 | 364 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
365 | |
366 | if (new->so_cred < sp->so_cred) | |
367 | p = &parent->rb_left; | |
368 | else if (new->so_cred > sp->so_cred) | |
369 | p = &parent->rb_right; | |
370 | else { | |
0aaaf5c4 CL |
371 | if (!list_empty(&sp->so_lru)) |
372 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
373 | atomic_inc(&sp->so_count); |
374 | return sp; | |
375 | } | |
376 | } | |
48c22eb2 | 377 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
378 | if (err) |
379 | return ERR_PTR(err); | |
24d292b8 CL |
380 | rb_link_node(&new->so_server_node, parent, p); |
381 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
382 | return new; |
383 | } | |
384 | ||
385 | static void | |
24d292b8 | 386 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 387 | { |
24d292b8 CL |
388 | struct nfs_server *server = sp->so_server; |
389 | ||
390 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
391 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 392 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
393 | } |
394 | ||
7ba127ab TM |
395 | static void |
396 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
397 | { | |
95b72eb0 | 398 | sc->create_time = ktime_get(); |
7ba127ab TM |
399 | sc->flags = 0; |
400 | sc->counter = 0; | |
401 | spin_lock_init(&sc->lock); | |
402 | INIT_LIST_HEAD(&sc->list); | |
403 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
404 | } | |
405 | ||
406 | static void | |
407 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
408 | { | |
409 | rpc_destroy_wait_queue(&sc->wait); | |
410 | } | |
411 | ||
1da177e4 LT |
412 | /* |
413 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
414 | * create a new state_owner. | |
415 | * | |
416 | */ | |
417 | static struct nfs4_state_owner * | |
d1e284d5 TM |
418 | nfs4_alloc_state_owner(struct nfs_server *server, |
419 | struct rpc_cred *cred, | |
420 | gfp_t gfp_flags) | |
1da177e4 LT |
421 | { |
422 | struct nfs4_state_owner *sp; | |
423 | ||
d1e284d5 | 424 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
425 | if (!sp) |
426 | return NULL; | |
d1e284d5 TM |
427 | sp->so_server = server; |
428 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 429 | spin_lock_init(&sp->so_lock); |
1da177e4 | 430 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 431 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 432 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 433 | INIT_LIST_HEAD(&sp->so_lru); |
1da177e4 LT |
434 | return sp; |
435 | } | |
436 | ||
1d2e88e7 | 437 | static void |
1da177e4 LT |
438 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
439 | { | |
c77365c9 TM |
440 | struct rb_node *rb_node = &sp->so_server_node; |
441 | ||
442 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
443 | struct nfs_server *server = sp->so_server; |
444 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
445 | |
446 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
447 | if (!RB_EMPTY_NODE(rb_node)) { |
448 | rb_erase(rb_node, &server->state_owners); | |
449 | RB_CLEAR_NODE(rb_node); | |
450 | } | |
9f958ab8 TM |
451 | spin_unlock(&clp->cl_lock); |
452 | } | |
1da177e4 LT |
453 | } |
454 | ||
0aaaf5c4 CL |
455 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
456 | { | |
7ba127ab | 457 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
458 | put_rpccred(sp->so_cred); |
459 | kfree(sp); | |
460 | } | |
461 | ||
462 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
463 | { | |
464 | struct nfs_client *clp = server->nfs_client; | |
465 | struct nfs4_state_owner *sp, *tmp; | |
466 | unsigned long time_min, time_max; | |
467 | LIST_HEAD(doomed); | |
468 | ||
469 | spin_lock(&clp->cl_lock); | |
470 | time_max = jiffies; | |
471 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
472 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
473 | /* NB: LRU is sorted so that oldest is at the head */ | |
474 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
475 | break; | |
476 | list_move(&sp->so_lru, &doomed); | |
477 | nfs4_remove_state_owner_locked(sp); | |
478 | } | |
479 | spin_unlock(&clp->cl_lock); | |
480 | ||
481 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
482 | list_del(&sp->so_lru); | |
483 | nfs4_free_state_owner(sp); | |
484 | } | |
485 | } | |
486 | ||
24d292b8 CL |
487 | /** |
488 | * nfs4_get_state_owner - Look up a state owner given a credential | |
489 | * @server: nfs_server to search | |
490 | * @cred: RPC credential to match | |
491 | * | |
492 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
493 | */ | |
494 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
495 | struct rpc_cred *cred, |
496 | gfp_t gfp_flags) | |
1da177e4 | 497 | { |
7539bbab | 498 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
499 | struct nfs4_state_owner *sp, *new; |
500 | ||
1da177e4 | 501 | spin_lock(&clp->cl_lock); |
24d292b8 | 502 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 503 | spin_unlock(&clp->cl_lock); |
1da177e4 | 504 | if (sp != NULL) |
0aaaf5c4 | 505 | goto out; |
d1e284d5 | 506 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 507 | if (new == NULL) |
0aaaf5c4 | 508 | goto out; |
9157c31d TM |
509 | do { |
510 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
511 | break; | |
512 | spin_lock(&clp->cl_lock); | |
513 | sp = nfs4_insert_state_owner_locked(new); | |
514 | spin_unlock(&clp->cl_lock); | |
515 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
516 | if (sp != new) |
517 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
518 | out: |
519 | nfs4_gc_state_owners(server); | |
9f958ab8 | 520 | return sp; |
1da177e4 LT |
521 | } |
522 | ||
24d292b8 CL |
523 | /** |
524 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
525 | * @sp: state owner data to release | |
7bf97bc2 TM |
526 | * |
527 | * Note that we keep released state owners on an LRU | |
528 | * list. | |
529 | * This caches valid state owners so that they can be | |
530 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
531 | * It also pins the uniquifier of dropped state owners for | |
532 | * a while, to ensure that those state owner names are | |
533 | * never reused. | |
24d292b8 | 534 | */ |
1da177e4 LT |
535 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
536 | { | |
0aaaf5c4 CL |
537 | struct nfs_server *server = sp->so_server; |
538 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
539 | |
540 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
541 | return; | |
0aaaf5c4 | 542 | |
7bf97bc2 TM |
543 | sp->so_expires = jiffies; |
544 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
545 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
546 | } |
547 | ||
548 | /** | |
549 | * nfs4_purge_state_owners - Release all cached state owners | |
550 | * @server: nfs_server with cached state owners to release | |
551 | * | |
552 | * Called at umount time. Remaining state owners will be on | |
553 | * the LRU with ref count of zero. | |
554 | */ | |
555 | void nfs4_purge_state_owners(struct nfs_server *server) | |
556 | { | |
557 | struct nfs_client *clp = server->nfs_client; | |
558 | struct nfs4_state_owner *sp, *tmp; | |
559 | LIST_HEAD(doomed); | |
560 | ||
561 | spin_lock(&clp->cl_lock); | |
562 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
563 | list_move(&sp->so_lru, &doomed); | |
564 | nfs4_remove_state_owner_locked(sp); | |
565 | } | |
1da177e4 | 566 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
567 | |
568 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
569 | list_del(&sp->so_lru); | |
570 | nfs4_free_state_owner(sp); | |
571 | } | |
1da177e4 LT |
572 | } |
573 | ||
574 | static struct nfs4_state * | |
575 | nfs4_alloc_open_state(void) | |
576 | { | |
577 | struct nfs4_state *state; | |
578 | ||
8535b2be | 579 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
580 | if (!state) |
581 | return NULL; | |
1da177e4 LT |
582 | atomic_set(&state->count, 1); |
583 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 584 | spin_lock_init(&state->state_lock); |
8bda4e4c | 585 | seqlock_init(&state->seqlock); |
1da177e4 LT |
586 | return state; |
587 | } | |
588 | ||
4cecb76f | 589 | void |
dc0b027d | 590 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 591 | { |
dc0b027d | 592 | if (state->state == fmode) |
4cecb76f TM |
593 | return; |
594 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
595 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
596 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
597 | list_move(&state->open_states, &state->owner->so_states); |
598 | else | |
599 | list_move_tail(&state->open_states, &state->owner->so_states); | |
600 | } | |
dc0b027d | 601 | state->state = fmode; |
4cecb76f TM |
602 | } |
603 | ||
1da177e4 LT |
604 | static struct nfs4_state * |
605 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
606 | { | |
607 | struct nfs_inode *nfsi = NFS_I(inode); | |
608 | struct nfs4_state *state; | |
609 | ||
610 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 611 | if (state->owner != owner) |
1da177e4 | 612 | continue; |
1c816efa | 613 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 614 | return state; |
1da177e4 LT |
615 | } |
616 | return NULL; | |
617 | } | |
618 | ||
1da177e4 LT |
619 | static void |
620 | nfs4_free_open_state(struct nfs4_state *state) | |
621 | { | |
622 | kfree(state); | |
623 | } | |
624 | ||
625 | struct nfs4_state * | |
626 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
627 | { | |
628 | struct nfs4_state *state, *new; | |
629 | struct nfs_inode *nfsi = NFS_I(inode); | |
630 | ||
631 | spin_lock(&inode->i_lock); | |
632 | state = __nfs4_find_state_byowner(inode, owner); | |
633 | spin_unlock(&inode->i_lock); | |
634 | if (state) | |
635 | goto out; | |
636 | new = nfs4_alloc_open_state(); | |
ec073428 | 637 | spin_lock(&owner->so_lock); |
1da177e4 LT |
638 | spin_lock(&inode->i_lock); |
639 | state = __nfs4_find_state_byowner(inode, owner); | |
640 | if (state == NULL && new != NULL) { | |
641 | state = new; | |
1da177e4 LT |
642 | state->owner = owner; |
643 | atomic_inc(&owner->so_count); | |
644 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
645 | ihold(inode); |
646 | state->inode = inode; | |
1da177e4 | 647 | spin_unlock(&inode->i_lock); |
ec073428 TM |
648 | /* Note: The reclaim code dictates that we add stateless |
649 | * and read-only stateids to the end of the list */ | |
650 | list_add_tail(&state->open_states, &owner->so_states); | |
651 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
652 | } else { |
653 | spin_unlock(&inode->i_lock); | |
ec073428 | 654 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
655 | if (new) |
656 | nfs4_free_open_state(new); | |
657 | } | |
658 | out: | |
659 | return state; | |
660 | } | |
661 | ||
1da177e4 LT |
662 | void nfs4_put_open_state(struct nfs4_state *state) |
663 | { | |
664 | struct inode *inode = state->inode; | |
665 | struct nfs4_state_owner *owner = state->owner; | |
666 | ||
ec073428 | 667 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 668 | return; |
ec073428 | 669 | spin_lock(&inode->i_lock); |
ba683031 | 670 | list_del(&state->inode_states); |
1da177e4 | 671 | list_del(&state->open_states); |
ec073428 TM |
672 | spin_unlock(&inode->i_lock); |
673 | spin_unlock(&owner->so_lock); | |
1da177e4 | 674 | iput(inode); |
1da177e4 LT |
675 | nfs4_free_open_state(state); |
676 | nfs4_put_state_owner(owner); | |
677 | } | |
678 | ||
679 | /* | |
83c9d41e | 680 | * Close the current file. |
1da177e4 | 681 | */ |
643168c2 | 682 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 683 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 684 | { |
1da177e4 | 685 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 686 | int call_close = 0; |
dc0b027d | 687 | fmode_t newstate; |
1da177e4 LT |
688 | |
689 | atomic_inc(&owner->so_count); | |
1da177e4 | 690 | /* Protect against nfs4_find_state() */ |
ec073428 | 691 | spin_lock(&owner->so_lock); |
dc0b027d | 692 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
693 | case FMODE_READ: |
694 | state->n_rdonly--; | |
695 | break; | |
696 | case FMODE_WRITE: | |
697 | state->n_wronly--; | |
698 | break; | |
699 | case FMODE_READ|FMODE_WRITE: | |
700 | state->n_rdwr--; | |
701 | } | |
003707c7 | 702 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 703 | if (state->n_rdwr == 0) { |
003707c7 | 704 | if (state->n_rdonly == 0) { |
e7616923 | 705 | newstate &= ~FMODE_READ; |
003707c7 TM |
706 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
707 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
708 | } | |
709 | if (state->n_wronly == 0) { | |
e7616923 | 710 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
711 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
712 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
713 | } | |
714 | if (newstate == 0) | |
715 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 716 | } |
003707c7 | 717 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 718 | spin_unlock(&owner->so_lock); |
4cecb76f | 719 | |
003707c7 | 720 | if (!call_close) { |
b39e625b TM |
721 | nfs4_put_open_state(state); |
722 | nfs4_put_state_owner(owner); | |
f7e8917a FI |
723 | } else { |
724 | bool roc = pnfs_roc(state->inode); | |
725 | ||
643168c2 | 726 | nfs4_do_close(state, gfp_mask, wait, roc); |
f7e8917a | 727 | } |
a49c3c77 TM |
728 | } |
729 | ||
643168c2 | 730 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 731 | { |
643168c2 | 732 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
733 | } |
734 | ||
643168c2 | 735 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 736 | { |
643168c2 | 737 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
738 | } |
739 | ||
740 | /* | |
741 | * Search the state->lock_states for an existing lock_owner | |
742 | * that is compatible with current->files | |
743 | */ | |
744 | static struct nfs4_lock_state * | |
77041ed9 | 745 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
746 | { |
747 | struct nfs4_lock_state *pos; | |
748 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 749 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 750 | continue; |
77041ed9 TM |
751 | switch (pos->ls_owner.lo_type) { |
752 | case NFS4_POSIX_LOCK_TYPE: | |
753 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
754 | continue; | |
755 | break; | |
756 | case NFS4_FLOCK_LOCK_TYPE: | |
757 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
758 | continue; | |
759 | } | |
1da177e4 LT |
760 | atomic_inc(&pos->ls_count); |
761 | return pos; | |
762 | } | |
763 | return NULL; | |
764 | } | |
765 | ||
1da177e4 LT |
766 | /* |
767 | * Return a compatible lock_state. If no initialized lock_state structure | |
768 | * exists, return an uninitialized one. | |
769 | * | |
1da177e4 | 770 | */ |
77041ed9 | 771 | 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 |
772 | { |
773 | struct nfs4_lock_state *lsp; | |
24d292b8 | 774 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 775 | |
8535b2be | 776 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
777 | if (lsp == NULL) |
778 | return NULL; | |
7ba127ab | 779 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 780 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 781 | lsp->ls_state = state; |
77041ed9 TM |
782 | lsp->ls_owner.lo_type = type; |
783 | switch (lsp->ls_owner.lo_type) { | |
784 | case NFS4_FLOCK_LOCK_TYPE: | |
785 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
786 | break; | |
787 | case NFS4_POSIX_LOCK_TYPE: | |
788 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
789 | break; | |
790 | default: | |
d2d7ce28 | 791 | goto out_free; |
77041ed9 | 792 | } |
48c22eb2 TM |
793 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
794 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 795 | goto out_free; |
8d0a8a9d | 796 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 797 | return lsp; |
d2d7ce28 TM |
798 | out_free: |
799 | kfree(lsp); | |
800 | return NULL; | |
1da177e4 LT |
801 | } |
802 | ||
5ae67c4f | 803 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 804 | { |
48c22eb2 | 805 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 806 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
807 | kfree(lsp); |
808 | } | |
809 | ||
1da177e4 LT |
810 | /* |
811 | * Return a compatible lock_state. If no initialized lock_state structure | |
812 | * exists, return an uninitialized one. | |
813 | * | |
1da177e4 | 814 | */ |
77041ed9 | 815 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 816 | { |
8d0a8a9d | 817 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 818 | |
8d0a8a9d TM |
819 | for(;;) { |
820 | spin_lock(&state->state_lock); | |
77041ed9 | 821 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
822 | if (lsp != NULL) |
823 | break; | |
824 | if (new != NULL) { | |
8d0a8a9d TM |
825 | list_add(&new->ls_locks, &state->lock_states); |
826 | set_bit(LK_STATE_IN_USE, &state->flags); | |
827 | lsp = new; | |
828 | new = NULL; | |
829 | break; | |
830 | } | |
831 | spin_unlock(&state->state_lock); | |
77041ed9 | 832 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
833 | if (new == NULL) |
834 | return NULL; | |
835 | } | |
836 | spin_unlock(&state->state_lock); | |
9f958ab8 | 837 | if (new != NULL) |
5ae67c4f | 838 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
839 | return lsp; |
840 | } | |
841 | ||
842 | /* | |
8d0a8a9d TM |
843 | * Release reference to lock_state, and free it if we see that |
844 | * it is no longer in use | |
1da177e4 | 845 | */ |
faf5f49c | 846 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 847 | { |
8d0a8a9d | 848 | struct nfs4_state *state; |
1da177e4 | 849 | |
8d0a8a9d TM |
850 | if (lsp == NULL) |
851 | return; | |
852 | state = lsp->ls_state; | |
853 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
854 | return; | |
855 | list_del(&lsp->ls_locks); | |
856 | if (list_empty(&state->lock_states)) | |
857 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
858 | spin_unlock(&state->state_lock); | |
cf470c3e TM |
859 | if (lsp->ls_flags & NFS_LOCK_INITIALIZED) { |
860 | if (nfs4_release_lockowner(lsp) == 0) | |
861 | return; | |
862 | } | |
5ae67c4f | 863 | nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp); |
1da177e4 LT |
864 | } |
865 | ||
8d0a8a9d | 866 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 867 | { |
8d0a8a9d | 868 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 869 | |
8d0a8a9d TM |
870 | dst->fl_u.nfs4_fl.owner = lsp; |
871 | atomic_inc(&lsp->ls_count); | |
872 | } | |
1da177e4 | 873 | |
8d0a8a9d | 874 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 875 | { |
8d0a8a9d | 876 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
877 | } |
878 | ||
6aed6285 | 879 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
880 | .fl_copy_lock = nfs4_fl_copy_lock, |
881 | .fl_release_private = nfs4_fl_release_lock, | |
882 | }; | |
883 | ||
884 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 885 | { |
8d0a8a9d TM |
886 | struct nfs4_lock_state *lsp; |
887 | ||
888 | if (fl->fl_ops != NULL) | |
889 | return 0; | |
77041ed9 TM |
890 | if (fl->fl_flags & FL_POSIX) |
891 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
892 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
893 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
894 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
895 | else |
896 | return -EINVAL; | |
8d0a8a9d TM |
897 | if (lsp == NULL) |
898 | return -ENOMEM; | |
899 | fl->fl_u.nfs4_fl.owner = lsp; | |
900 | fl->fl_ops = &nfs4_fl_lock_ops; | |
901 | return 0; | |
1da177e4 LT |
902 | } |
903 | ||
4fc8796d TM |
904 | static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
905 | fl_owner_t fl_owner, pid_t fl_pid) | |
1da177e4 | 906 | { |
8d0a8a9d | 907 | struct nfs4_lock_state *lsp; |
4fc8796d | 908 | bool ret = false; |
1da177e4 | 909 | |
8d0a8a9d | 910 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 911 | goto out; |
1da177e4 | 912 | |
8d0a8a9d | 913 | spin_lock(&state->state_lock); |
77041ed9 | 914 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
4fc8796d | 915 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) { |
f597c537 | 916 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
4fc8796d TM |
917 | ret = true; |
918 | } | |
8d0a8a9d | 919 | spin_unlock(&state->state_lock); |
1da177e4 | 920 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
921 | out: |
922 | return ret; | |
923 | } | |
924 | ||
925 | static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) | |
926 | { | |
927 | int seq; | |
928 | ||
929 | do { | |
930 | seq = read_seqbegin(&state->seqlock); | |
931 | nfs4_stateid_copy(dst, &state->stateid); | |
932 | } while (read_seqretry(&state->seqlock, seq)); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Byte-range lock aware utility to initialize the stateid of read/write | |
937 | * requests. | |
938 | */ | |
939 | void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, | |
940 | fmode_t fmode, fl_owner_t fl_owner, pid_t fl_pid) | |
941 | { | |
942 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) | |
943 | return; | |
944 | if (nfs4_copy_lock_stateid(dst, state, fl_owner, fl_pid)) | |
945 | return; | |
946 | nfs4_copy_open_stateid(dst, state); | |
1da177e4 LT |
947 | } |
948 | ||
8535b2be | 949 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 950 | { |
cee54fc9 TM |
951 | struct nfs_seqid *new; |
952 | ||
8535b2be | 953 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
954 | if (new != NULL) { |
955 | new->sequence = counter; | |
2f74c0a0 | 956 | INIT_LIST_HEAD(&new->list); |
4601df20 | 957 | new->task = NULL; |
cee54fc9 TM |
958 | } |
959 | return new; | |
960 | } | |
961 | ||
72211dbe | 962 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 963 | { |
4601df20 | 964 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 965 | |
4601df20 TM |
966 | if (list_empty(&seqid->list)) |
967 | return; | |
968 | sequence = seqid->sequence; | |
969 | spin_lock(&sequence->lock); | |
970 | list_del_init(&seqid->list); | |
971 | if (!list_empty(&sequence->list)) { | |
972 | struct nfs_seqid *next; | |
973 | ||
974 | next = list_first_entry(&sequence->list, | |
975 | struct nfs_seqid, list); | |
976 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 977 | } |
4601df20 | 978 | spin_unlock(&sequence->lock); |
72211dbe TM |
979 | } |
980 | ||
981 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
982 | { | |
983 | nfs_release_seqid(seqid); | |
cee54fc9 | 984 | kfree(seqid); |
1da177e4 LT |
985 | } |
986 | ||
987 | /* | |
cee54fc9 TM |
988 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
989 | * failed with a seqid incrementing error - | |
990 | * see comments nfs_fs.h:seqid_mutating_error() | |
991 | */ | |
88d90939 | 992 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 | 993 | { |
7ba127ab | 994 | BUG_ON(list_first_entry(&seqid->sequence->list, struct nfs_seqid, list) != seqid); |
cee54fc9 TM |
995 | switch (status) { |
996 | case 0: | |
997 | break; | |
998 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
999 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1000 | return; | |
9a3ba432 | 1001 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1002 | " sequence-id error on an" |
1003 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1004 | seqid->sequence); |
cee54fc9 TM |
1005 | case -NFS4ERR_STALE_CLIENTID: |
1006 | case -NFS4ERR_STALE_STATEID: | |
1007 | case -NFS4ERR_BAD_STATEID: | |
1008 | case -NFS4ERR_BADXDR: | |
1009 | case -NFS4ERR_RESOURCE: | |
1010 | case -NFS4ERR_NOFILEHANDLE: | |
1011 | /* Non-seqid mutating errors */ | |
1012 | return; | |
1013 | }; | |
1014 | /* | |
1015 | * Note: no locking needed as we are guaranteed to be first | |
1016 | * on the sequence list | |
1017 | */ | |
1018 | seqid->sequence->counter++; | |
1019 | } | |
1020 | ||
1021 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1022 | { | |
34dc1ad7 BH |
1023 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1024 | struct nfs4_state_owner, so_seqid); | |
1025 | struct nfs_server *server = sp->so_server; | |
1026 | ||
1027 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1028 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1029 | if (!nfs4_has_session(server->nfs_client)) |
1030 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1031 | } |
1032 | ||
1033 | /* | |
cee54fc9 TM |
1034 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1035 | * failed with a seqid incrementing error - | |
1036 | * see comments nfs_fs.h:seqid_mutating_error() | |
1037 | */ | |
1038 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1039 | { | |
88d90939 | 1040 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1041 | } |
1042 | ||
1043 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1044 | { | |
7ba127ab | 1045 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1046 | int status = 0; |
1047 | ||
1048 | spin_lock(&sequence->lock); | |
4601df20 | 1049 | seqid->task = task; |
2f74c0a0 TM |
1050 | if (list_empty(&seqid->list)) |
1051 | list_add_tail(&seqid->list, &sequence->list); | |
1052 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1053 | goto unlock; | |
5d00837b | 1054 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1055 | status = -EAGAIN; |
1056 | unlock: | |
cee54fc9 TM |
1057 | spin_unlock(&sequence->lock); |
1058 | return status; | |
1da177e4 LT |
1059 | } |
1060 | ||
e005e804 | 1061 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1062 | |
e005e804 | 1063 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1064 | { |
1065 | smp_mb__before_clear_bit(); | |
e005e804 | 1066 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1067 | smp_mb__after_clear_bit(); |
e005e804 | 1068 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1069 | rpc_wake_up(&clp->cl_rpcwaitq); |
1070 | } | |
1071 | ||
1da177e4 | 1072 | /* |
e005e804 | 1073 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1074 | */ |
b0d3ded1 | 1075 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1076 | { |
5043e900 | 1077 | struct task_struct *task; |
2446ab60 | 1078 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1079 | |
e005e804 TM |
1080 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1081 | return; | |
5043e900 TM |
1082 | __module_get(THIS_MODULE); |
1083 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1084 | |
1085 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1086 | * manager is the only thread that ever changes the rpc_xprt | |
1087 | * after it's initialized. At this point, we're single threaded. */ | |
1088 | rcu_read_lock(); | |
1089 | snprintf(buf, sizeof(buf), "%s-manager", | |
1090 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1091 | rcu_read_unlock(); | |
1092 | task = kthread_run(nfs4_run_state_manager, clp, buf); | |
1093 | if (IS_ERR(task)) { | |
1094 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1095 | __func__, PTR_ERR(task)); | |
1096 | nfs4_clear_state_manager_bit(clp); | |
1097 | nfs_put_client(clp); | |
1098 | module_put(THIS_MODULE); | |
1099 | } | |
1da177e4 LT |
1100 | } |
1101 | ||
1102 | /* | |
0400a6b0 | 1103 | * Schedule a lease recovery attempt |
1da177e4 | 1104 | */ |
0400a6b0 | 1105 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1106 | { |
1107 | if (!clp) | |
1108 | return; | |
e598d843 TM |
1109 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1110 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
e005e804 | 1111 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1112 | } |
9cb81968 | 1113 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1114 | |
ad1e3968 TM |
1115 | /* |
1116 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1117 | * @clp: client to process | |
1118 | * | |
1119 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1120 | * resend of the SETCLIENTID and hence re-establish the | |
1121 | * callback channel. Then return all existing delegations. | |
1122 | */ | |
1123 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1124 | { | |
1125 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1126 | nfs_expire_all_delegations(clp); | |
1127 | } | |
1128 | ||
042b60be TM |
1129 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1130 | { | |
ad1e3968 | 1131 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1132 | nfs4_schedule_state_manager(clp); |
1133 | } | |
1134 | ||
f9feab1e | 1135 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1136 | { |
1137 | ||
1138 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1139 | /* Don't recover state that expired before the reboot */ | |
1140 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1141 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1142 | return 0; | |
1143 | } | |
7eff03ae | 1144 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1145 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1146 | return 1; | |
1147 | } | |
1148 | ||
f9feab1e | 1149 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1150 | { |
1151 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1152 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1153 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1154 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1155 | return 1; | |
1156 | } | |
1157 | ||
0400a6b0 TM |
1158 | void nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
1159 | { | |
1160 | struct nfs_client *clp = server->nfs_client; | |
1161 | ||
1162 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1163 | nfs4_schedule_state_manager(clp); | |
1164 | } | |
9cb81968 | 1165 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1166 | |
a1d0b5ee TM |
1167 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1168 | const nfs4_stateid *stateid) | |
1169 | { | |
1170 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1171 | struct nfs_inode *nfsi = NFS_I(inode); | |
1172 | struct nfs_open_context *ctx; | |
1173 | struct nfs4_state *state; | |
1174 | bool found = false; | |
1175 | ||
1176 | spin_lock(&inode->i_lock); | |
1177 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1178 | state = ctx->state; | |
1179 | if (state == NULL) | |
1180 | continue; | |
1181 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1182 | continue; | |
f597c537 | 1183 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1184 | continue; |
1185 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1186 | found = true; | |
1187 | } | |
1188 | spin_unlock(&inode->i_lock); | |
1189 | if (found) | |
1190 | nfs4_schedule_state_manager(clp); | |
1191 | } | |
1192 | ||
1193 | ||
02860014 | 1194 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1195 | { |
1196 | struct inode *inode = state->inode; | |
19e03c57 | 1197 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1198 | struct file_lock *fl; |
1199 | int status = 0; | |
1200 | ||
3f09df70 TM |
1201 | if (inode->i_flock == NULL) |
1202 | return 0; | |
1203 | ||
1204 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1205 | down_write(&nfsi->rwsem); |
3f09df70 | 1206 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1207 | lock_flocks(); |
90dc7d27 | 1208 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1209 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1210 | continue; |
cd3758e3 | 1211 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1212 | continue; |
b89f4321 | 1213 | unlock_flocks(); |
1da177e4 | 1214 | status = ops->recover_lock(state, fl); |
1da177e4 | 1215 | switch (status) { |
965b5d67 TM |
1216 | case 0: |
1217 | break; | |
1218 | case -ESTALE: | |
1219 | case -NFS4ERR_ADMIN_REVOKED: | |
1220 | case -NFS4ERR_STALE_STATEID: | |
1221 | case -NFS4ERR_BAD_STATEID: | |
1222 | case -NFS4ERR_EXPIRED: | |
1223 | case -NFS4ERR_NO_GRACE: | |
1224 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1225 | case -NFS4ERR_BADSESSION: |
1226 | case -NFS4ERR_BADSLOT: | |
1227 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1228 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1229 | goto out; |
1da177e4 | 1230 | default: |
a030889a WAA |
1231 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1232 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1233 | case -ENOMEM: |
1234 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1235 | case -NFS4ERR_RECLAIM_BAD: |
1236 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1237 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1238 | status = 0; |
1da177e4 | 1239 | } |
b89f4321 | 1240 | lock_flocks(); |
1da177e4 | 1241 | } |
b89f4321 | 1242 | unlock_flocks(); |
965b5d67 | 1243 | out: |
19e03c57 | 1244 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1245 | return status; |
1246 | } | |
1247 | ||
02860014 | 1248 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1249 | { |
1250 | struct nfs4_state *state; | |
1251 | struct nfs4_lock_state *lock; | |
1252 | int status = 0; | |
1253 | ||
1254 | /* Note: we rely on the sp->so_states list being ordered | |
1255 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1256 | * states first. | |
1257 | * This is needed to ensure that the server won't give us any | |
1258 | * read delegations that we have to return if, say, we are | |
1259 | * recovering after a network partition or a reboot from a | |
1260 | * server that doesn't support a grace period. | |
1261 | */ | |
fe1d8195 TM |
1262 | restart: |
1263 | spin_lock(&sp->so_lock); | |
1da177e4 | 1264 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1265 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1266 | continue; | |
1da177e4 LT |
1267 | if (state->state == 0) |
1268 | continue; | |
fe1d8195 TM |
1269 | atomic_inc(&state->count); |
1270 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1271 | status = ops->recover_open(sp, state); |
1da177e4 | 1272 | if (status >= 0) { |
02860014 TM |
1273 | status = nfs4_reclaim_locks(state, ops); |
1274 | if (status >= 0) { | |
4b44b40e | 1275 | spin_lock(&state->state_lock); |
02860014 TM |
1276 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
1277 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) | |
96dcadc2 WD |
1278 | pr_warn_ratelimited("NFS: " |
1279 | "%s: Lock reclaim " | |
a030889a | 1280 | "failed!\n", __func__); |
02860014 | 1281 | } |
4b44b40e | 1282 | spin_unlock(&state->state_lock); |
fe1d8195 TM |
1283 | nfs4_put_open_state(state); |
1284 | goto restart; | |
1da177e4 | 1285 | } |
1da177e4 LT |
1286 | } |
1287 | switch (status) { | |
1288 | default: | |
a030889a WAA |
1289 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1290 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1291 | case -ENOENT: |
965b5d67 | 1292 | case -ENOMEM: |
b79a4a1b | 1293 | case -ESTALE: |
1da177e4 LT |
1294 | /* |
1295 | * Open state on this file cannot be recovered | |
1296 | * All we can do is revert to using the zero stateid. | |
1297 | */ | |
2d2f24ad TM |
1298 | memset(&state->stateid, 0, |
1299 | sizeof(state->stateid)); | |
1da177e4 LT |
1300 | /* Mark the file as being 'closed' */ |
1301 | state->state = 0; | |
1302 | break; | |
168667c4 TM |
1303 | case -EKEYEXPIRED: |
1304 | /* | |
1305 | * User RPCSEC_GSS context has expired. | |
1306 | * We cannot recover this stateid now, so | |
1307 | * skip it and allow recovery thread to | |
1308 | * proceed. | |
1309 | */ | |
1310 | break; | |
965b5d67 TM |
1311 | case -NFS4ERR_ADMIN_REVOKED: |
1312 | case -NFS4ERR_STALE_STATEID: | |
1313 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1314 | case -NFS4ERR_RECLAIM_BAD: |
1315 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1316 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1317 | break; |
1da177e4 LT |
1318 | case -NFS4ERR_EXPIRED: |
1319 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1320 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1321 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1322 | case -NFS4ERR_BADSESSION: |
1323 | case -NFS4ERR_BADSLOT: | |
1324 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1325 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1326 | goto out_err; |
1327 | } | |
fe1d8195 TM |
1328 | nfs4_put_open_state(state); |
1329 | goto restart; | |
1da177e4 | 1330 | } |
fe1d8195 | 1331 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1332 | return 0; |
1333 | out_err: | |
fe1d8195 | 1334 | nfs4_put_open_state(state); |
1da177e4 LT |
1335 | return status; |
1336 | } | |
1337 | ||
b79a4a1b TM |
1338 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1339 | { | |
1340 | struct nfs4_lock_state *lock; | |
1341 | ||
1342 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1343 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1344 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1345 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1346 | spin_lock(&state->state_lock); |
b79a4a1b | 1347 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b TM |
1348 | lock->ls_seqid.flags = 0; |
1349 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; | |
1350 | } | |
4b44b40e | 1351 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1352 | } |
1353 | ||
24d292b8 CL |
1354 | static void nfs4_reset_seqids(struct nfs_server *server, |
1355 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1356 | { |
24d292b8 | 1357 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1358 | struct nfs4_state_owner *sp; |
9f958ab8 | 1359 | struct rb_node *pos; |
cee54fc9 | 1360 | struct nfs4_state *state; |
cee54fc9 | 1361 | |
24d292b8 CL |
1362 | spin_lock(&clp->cl_lock); |
1363 | for (pos = rb_first(&server->state_owners); | |
1364 | pos != NULL; | |
1365 | pos = rb_next(pos)) { | |
1366 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1367 | sp->so_seqid.flags = 0; |
ec073428 | 1368 | spin_lock(&sp->so_lock); |
cee54fc9 | 1369 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1370 | if (mark_reclaim(clp, state)) |
1371 | nfs4_clear_open_state(state); | |
cee54fc9 | 1372 | } |
ec073428 | 1373 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1374 | } |
24d292b8 CL |
1375 | spin_unlock(&clp->cl_lock); |
1376 | } | |
1377 | ||
1378 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1379 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1380 | { | |
1381 | struct nfs_server *server; | |
1382 | ||
1383 | rcu_read_lock(); | |
1384 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1385 | nfs4_reset_seqids(server, mark_reclaim); | |
1386 | rcu_read_unlock(); | |
cee54fc9 TM |
1387 | } |
1388 | ||
b79a4a1b TM |
1389 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1390 | { | |
1391 | /* Mark all delegations for reclaim */ | |
1392 | nfs_delegation_mark_reclaim(clp); | |
1393 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1394 | } | |
1395 | ||
fce5c838 RL |
1396 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1397 | const struct nfs4_state_recovery_ops *ops) | |
1398 | { | |
1399 | /* Notify the server we're done reclaiming our state */ | |
1400 | if (ops->reclaim_complete) | |
1401 | (void)ops->reclaim_complete(clp); | |
1402 | } | |
1403 | ||
24d292b8 | 1404 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1405 | { |
24d292b8 | 1406 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1407 | struct nfs4_state_owner *sp; |
1408 | struct rb_node *pos; | |
1409 | struct nfs4_state *state; | |
1410 | ||
24d292b8 CL |
1411 | spin_lock(&clp->cl_lock); |
1412 | for (pos = rb_first(&server->state_owners); | |
1413 | pos != NULL; | |
1414 | pos = rb_next(pos)) { | |
1415 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1416 | spin_lock(&sp->so_lock); |
1417 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1418 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1419 | &state->flags)) | |
b79a4a1b TM |
1420 | continue; |
1421 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1422 | } | |
1423 | spin_unlock(&sp->so_lock); | |
1424 | } | |
24d292b8 CL |
1425 | spin_unlock(&clp->cl_lock); |
1426 | } | |
1427 | ||
1428 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1429 | { | |
1430 | struct nfs_server *server; | |
1431 | ||
1432 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1433 | return 0; | |
1434 | ||
1435 | rcu_read_lock(); | |
1436 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1437 | nfs4_clear_reclaim_server(server); | |
1438 | rcu_read_unlock(); | |
b79a4a1b TM |
1439 | |
1440 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1441 | return 1; |
1442 | } | |
1443 | ||
1444 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1445 | { | |
1446 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1447 | return; | |
1448 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
b79a4a1b TM |
1449 | } |
1450 | ||
1451 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1452 | { | |
1453 | nfs_delegation_mark_reclaim(clp); | |
1454 | nfs_delegation_reap_unclaimed(clp); | |
1455 | } | |
1456 | ||
1457 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1458 | { | |
1459 | nfs_delegation_clear_all(clp); | |
1460 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1461 | } | |
1462 | ||
168667c4 TM |
1463 | static void nfs4_warn_keyexpired(const char *s) |
1464 | { | |
1465 | printk_ratelimited(KERN_WARNING "Error: state manager" | |
1466 | " encountered RPCSEC_GSS session" | |
1467 | " expired against NFSv4 server %s.\n", | |
1468 | s); | |
1469 | } | |
1470 | ||
4f7cdf18 | 1471 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1472 | { |
1473 | switch (error) { | |
4f38e4aa TM |
1474 | case 0: |
1475 | break; | |
e598d843 | 1476 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1477 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1478 | break; |
c8b7ae3d TM |
1479 | case -NFS4ERR_NO_GRACE: |
1480 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1481 | break; |
e598d843 TM |
1482 | case -NFS4ERR_STALE_CLIENTID: |
1483 | case -NFS4ERR_LEASE_MOVED: | |
1484 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1485 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1486 | nfs4_state_start_reclaim_reboot(clp); |
1487 | break; | |
1488 | case -NFS4ERR_EXPIRED: | |
1489 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1490 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1491 | break; |
c3fad1b1 AA |
1492 | case -NFS4ERR_BADSESSION: |
1493 | case -NFS4ERR_BADSLOT: | |
1494 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1495 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1496 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1497 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1498 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1499 | /* Zero session reset errors */ |
4f38e4aa | 1500 | break; |
7c5d7256 TM |
1501 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1502 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1503 | break; | |
168667c4 TM |
1504 | case -EKEYEXPIRED: |
1505 | /* Nothing we can do */ | |
1506 | nfs4_warn_keyexpired(clp->cl_hostname); | |
4f38e4aa TM |
1507 | break; |
1508 | default: | |
1509 | return error; | |
e598d843 | 1510 | } |
4f38e4aa | 1511 | return 0; |
e598d843 TM |
1512 | } |
1513 | ||
02860014 | 1514 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1515 | { |
24d292b8 CL |
1516 | struct nfs4_state_owner *sp; |
1517 | struct nfs_server *server; | |
9f958ab8 | 1518 | struct rb_node *pos; |
1da177e4 LT |
1519 | int status = 0; |
1520 | ||
7eff03ae | 1521 | restart: |
24d292b8 CL |
1522 | rcu_read_lock(); |
1523 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1524 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1525 | spin_lock(&clp->cl_lock); |
1526 | for (pos = rb_first(&server->state_owners); | |
1527 | pos != NULL; | |
1528 | pos = rb_next(pos)) { | |
1529 | sp = rb_entry(pos, | |
1530 | struct nfs4_state_owner, so_server_node); | |
1531 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1532 | &sp->so_flags)) | |
1533 | continue; | |
1534 | atomic_inc(&sp->so_count); | |
1535 | spin_unlock(&clp->cl_lock); | |
1536 | rcu_read_unlock(); | |
1537 | ||
1538 | status = nfs4_reclaim_open_state(sp, ops); | |
1539 | if (status < 0) { | |
1540 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1541 | nfs4_put_state_owner(sp); | |
1542 | return nfs4_recovery_handle_error(clp, status); | |
1543 | } | |
1544 | ||
7eff03ae | 1545 | nfs4_put_state_owner(sp); |
24d292b8 | 1546 | goto restart; |
7eff03ae | 1547 | } |
24d292b8 | 1548 | spin_unlock(&clp->cl_lock); |
02860014 | 1549 | } |
24d292b8 | 1550 | rcu_read_unlock(); |
02860014 TM |
1551 | return status; |
1552 | } | |
1553 | ||
1554 | static int nfs4_check_lease(struct nfs_client *clp) | |
1555 | { | |
1556 | struct rpc_cred *cred; | |
c48f4f35 TM |
1557 | const struct nfs4_state_maintenance_ops *ops = |
1558 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1559 | int status; |
1da177e4 | 1560 | |
0f605b56 TM |
1561 | /* Is the client already known to have an expired lease? */ |
1562 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1563 | return 0; | |
a7b72103 AA |
1564 | spin_lock(&clp->cl_lock); |
1565 | cred = ops->get_state_renewal_cred_locked(clp); | |
1566 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1567 | if (cred == NULL) { |
1568 | cred = nfs4_get_setclientid_cred(clp); | |
4f38e4aa | 1569 | status = -ENOKEY; |
0f605b56 TM |
1570 | if (cred == NULL) |
1571 | goto out; | |
286d7d6a | 1572 | } |
8e69514f | 1573 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1574 | put_rpccred(cred); |
1575 | out: | |
4f7cdf18 | 1576 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1577 | } |
1578 | ||
2a6ee6aa TM |
1579 | /* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors |
1580 | * on EXCHANGE_ID for v4.1 | |
1581 | */ | |
1582 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1583 | { | |
1584 | switch (status) { | |
89a21736 TM |
1585 | case -NFS4ERR_SEQ_MISORDERED: |
1586 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1587 | return -ESERVERFAULT; | |
1588 | /* Lease confirmation error: retry after purging the lease */ | |
1589 | ssleep(1); | |
2a6ee6aa TM |
1590 | case -NFS4ERR_CLID_INUSE: |
1591 | case -NFS4ERR_STALE_CLIENTID: | |
1592 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1593 | break; | |
1594 | case -EACCES: | |
1595 | if (clp->cl_machine_cred == NULL) | |
1596 | return -EACCES; | |
1597 | /* Handle case where the user hasn't set up machine creds */ | |
1598 | nfs4_clear_machine_cred(clp); | |
1599 | case -NFS4ERR_DELAY: | |
1600 | case -ETIMEDOUT: | |
1601 | case -EAGAIN: | |
1602 | ssleep(1); | |
1603 | break; | |
1604 | ||
1605 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1606 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1607 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
1608 | return -EPROTONOSUPPORT; | |
1609 | case -EKEYEXPIRED: | |
1610 | nfs4_warn_keyexpired(clp->cl_hostname); | |
1611 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery | |
1612 | * in nfs4_exchange_id */ | |
1613 | default: | |
1614 | return status; | |
1615 | } | |
1616 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1617 | return 0; | |
1618 | } | |
1619 | ||
02860014 TM |
1620 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1621 | { | |
1622 | struct rpc_cred *cred; | |
c48f4f35 TM |
1623 | const struct nfs4_state_recovery_ops *ops = |
1624 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1625 | int status; |
02860014 | 1626 | |
90a16617 | 1627 | cred = ops->get_clid_cred(clp); |
2a6ee6aa TM |
1628 | if (cred == NULL) |
1629 | return -ENOENT; | |
1630 | status = ops->establish_clid(clp, cred); | |
1631 | put_rpccred(cred); | |
1632 | if (status != 0) | |
1633 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1634 | return 0; | |
02860014 TM |
1635 | } |
1636 | ||
76db6d95 | 1637 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1638 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1639 | { |
444f72fe TM |
1640 | struct nfs_client *clp = session->clp; |
1641 | ||
9f594791 TM |
1642 | switch (err) { |
1643 | default: | |
1644 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1645 | break; | |
1646 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1647 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1648 | } | |
444f72fe | 1649 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1650 | } |
cbdabc7f | 1651 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1652 | |
b9efa1b2 AA |
1653 | void nfs41_handle_recall_slot(struct nfs_client *clp) |
1654 | { | |
1655 | set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
0400a6b0 | 1656 | nfs4_schedule_state_manager(clp); |
b9efa1b2 AA |
1657 | } |
1658 | ||
0f79fd6f TM |
1659 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1660 | { | |
1661 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1662 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1663 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1664 | nfs4_state_start_reclaim_nograce(clp); |
0400a6b0 | 1665 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1666 | } |
1667 | } | |
1668 | ||
1669 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1670 | { | |
1671 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1672 | nfs4_state_start_reclaim_reboot(clp); | |
0400a6b0 | 1673 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1674 | } |
1675 | } | |
1676 | ||
1677 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1678 | { | |
0f79fd6f TM |
1679 | nfs4_reset_all_state(clp); |
1680 | } | |
1681 | ||
1682 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1683 | { | |
1684 | /* This will need to handle layouts too */ | |
1685 | nfs_expire_all_delegations(clp); | |
1686 | } | |
1687 | ||
a9e64442 | 1688 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
1689 | { |
1690 | nfs_expire_all_delegations(clp); | |
1691 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1692 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1693 | } |
1694 | ||
a9e64442 WAA |
1695 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
1696 | { | |
1697 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1698 | &clp->cl_state) == 0) | |
1699 | nfs4_schedule_state_manager(clp); | |
1700 | } | |
1701 | ||
0629e370 AB |
1702 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1703 | { | |
1704 | if (!flags) | |
1705 | return; | |
2c820d9a CL |
1706 | |
1707 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
1708 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
1709 | ||
111d489f | 1710 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 1711 | nfs41_handle_server_reboot(clp); |
111d489f | 1712 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
1713 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
1714 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
1715 | SEQ4_STATUS_LEASE_MOVED)) |
1716 | nfs41_handle_state_revoked(clp); | |
111d489f | 1717 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 1718 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
1719 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
1720 | nfs41_handle_backchannel_fault(clp); | |
1721 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
1722 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 1723 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
1724 | } |
1725 | ||
c3fad1b1 AA |
1726 | static int nfs4_reset_session(struct nfs_client *clp) |
1727 | { | |
848f5bda | 1728 | struct rpc_cred *cred; |
c3fad1b1 AA |
1729 | int status; |
1730 | ||
38045412 | 1731 | nfs4_begin_drain_session(clp); |
848f5bda TM |
1732 | cred = nfs4_get_exchange_id_cred(clp); |
1733 | status = nfs4_proc_destroy_session(clp->cl_session, cred); | |
c3fad1b1 AA |
1734 | if (status && status != -NFS4ERR_BADSESSION && |
1735 | status != -NFS4ERR_DEADSESSION) { | |
f455848a | 1736 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
1737 | goto out; |
1738 | } | |
1739 | ||
1740 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 1741 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 1742 | if (status) { |
f2c1b510 | 1743 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
1744 | goto out; |
1745 | } | |
444f72fe | 1746 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
41f54a55 AA |
1747 | /* create_session negotiated new slot table */ |
1748 | clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state); | |
a9e64442 | 1749 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
9dfdf404 | 1750 | |
41f54a55 AA |
1751 | /* Let the state manager reestablish state */ |
1752 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
5601a00d | 1753 | nfs41_setup_state_renewal(clp); |
41f54a55 | 1754 | out: |
848f5bda TM |
1755 | if (cred) |
1756 | put_rpccred(cred); | |
c3fad1b1 AA |
1757 | return status; |
1758 | } | |
76db6d95 | 1759 | |
b9efa1b2 AA |
1760 | static int nfs4_recall_slot(struct nfs_client *clp) |
1761 | { | |
1762 | struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table; | |
1763 | struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs; | |
1764 | struct nfs4_slot *new, *old; | |
1765 | int i; | |
1766 | ||
1767 | nfs4_begin_drain_session(clp); | |
1768 | new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot), | |
8535b2be | 1769 | GFP_NOFS); |
b9efa1b2 AA |
1770 | if (!new) |
1771 | return -ENOMEM; | |
1772 | ||
1773 | spin_lock(&fc_tbl->slot_tbl_lock); | |
1774 | for (i = 0; i < fc_tbl->target_max_slots; i++) | |
1775 | new[i].seq_nr = fc_tbl->slots[i].seq_nr; | |
1776 | old = fc_tbl->slots; | |
1777 | fc_tbl->slots = new; | |
1778 | fc_tbl->max_slots = fc_tbl->target_max_slots; | |
1779 | fc_tbl->target_max_slots = 0; | |
1780 | fc_attrs->max_reqs = fc_tbl->max_slots; | |
1781 | spin_unlock(&fc_tbl->slot_tbl_lock); | |
1782 | ||
1783 | kfree(old); | |
1784 | nfs4_end_drain_session(clp); | |
1785 | return 0; | |
1786 | } | |
1787 | ||
a9e64442 WAA |
1788 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
1789 | { | |
2cf047c9 TM |
1790 | struct rpc_cred *cred; |
1791 | int ret; | |
1792 | ||
43ac544c | 1793 | nfs4_begin_drain_session(clp); |
2cf047c9 TM |
1794 | cred = nfs4_get_exchange_id_cred(clp); |
1795 | ret = nfs4_proc_bind_conn_to_session(clp, cred); | |
1796 | if (cred) | |
1797 | put_rpccred(cred); | |
43ac544c | 1798 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
1799 | switch (ret) { |
1800 | case 0: | |
1801 | break; | |
1802 | case -NFS4ERR_DELAY: | |
1803 | ssleep(1); | |
1804 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1805 | break; | |
1806 | default: | |
1807 | return nfs4_recovery_handle_error(clp, ret); | |
1808 | } | |
1809 | return 0; | |
a9e64442 | 1810 | } |
76db6d95 | 1811 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 1812 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 1813 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
b9efa1b2 | 1814 | static int nfs4_recall_slot(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
1815 | |
1816 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
1817 | { | |
1818 | return 0; | |
1819 | } | |
76db6d95 AA |
1820 | #endif /* CONFIG_NFS_V4_1 */ |
1821 | ||
e005e804 | 1822 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 1823 | { |
02860014 TM |
1824 | int status = 0; |
1825 | ||
02860014 | 1826 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 1827 | do { |
2c820d9a | 1828 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
2a6ee6aa TM |
1829 | status = nfs4_reclaim_lease(clp); |
1830 | if (status < 0) | |
1831 | goto out_error; | |
2c820d9a CL |
1832 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1833 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1834 | } | |
1835 | ||
b79a4a1b TM |
1836 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
1837 | /* We're going to have to re-establish a clientid */ | |
1838 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 1839 | if (status < 0) |
b79a4a1b | 1840 | goto out_error; |
2a6ee6aa TM |
1841 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1842 | continue; | |
e598d843 | 1843 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
78fe0f41 WAA |
1844 | |
1845 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, | |
1846 | &clp->cl_state)) | |
1847 | nfs4_state_start_reclaim_nograce(clp); | |
1848 | else | |
1849 | set_bit(NFS4CLNT_RECLAIM_REBOOT, | |
1850 | &clp->cl_state); | |
1851 | ||
974cec8c | 1852 | pnfs_destroy_all_layouts(clp); |
e598d843 TM |
1853 | } |
1854 | ||
1855 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { | |
1856 | status = nfs4_check_lease(clp); | |
4f38e4aa TM |
1857 | if (status < 0) |
1858 | goto out_error; | |
b6d408ba | 1859 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
e598d843 | 1860 | continue; |
b79a4a1b | 1861 | } |
b6d408ba | 1862 | |
c3fad1b1 | 1863 | /* Initialize or reset the session */ |
6df08189 | 1864 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) |
7111dc73 | 1865 | && nfs4_has_session(clp)) { |
4d643d1d | 1866 | status = nfs4_reset_session(clp); |
b6d408ba TM |
1867 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1868 | continue; | |
1869 | if (status < 0) | |
76db6d95 | 1870 | goto out_error; |
76db6d95 | 1871 | } |
b6d408ba | 1872 | |
a9e64442 WAA |
1873 | /* Send BIND_CONN_TO_SESSION */ |
1874 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1875 | &clp->cl_state) && nfs4_has_session(clp)) { | |
1876 | status = nfs4_bind_conn_to_session(clp); | |
1877 | if (status < 0) | |
1878 | goto out_error; | |
bf674c82 | 1879 | continue; |
a9e64442 WAA |
1880 | } |
1881 | ||
b79a4a1b | 1882 | /* First recover reboot state... */ |
e345e88a | 1883 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
591d71cb | 1884 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1885 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 1886 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1887 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 1888 | continue; |
b79a4a1b | 1889 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
1890 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
1891 | continue; | |
1892 | if (status < 0) | |
1893 | goto out_error; | |
02860014 TM |
1894 | } |
1895 | ||
b79a4a1b TM |
1896 | /* Now recover expired state... */ |
1897 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
591d71cb | 1898 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 1899 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 1900 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 1901 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
1902 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
1903 | continue; | |
1904 | if (status < 0) | |
b79a4a1b | 1905 | goto out_error; |
1da177e4 | 1906 | } |
707fb4b3 | 1907 | |
5601a00d | 1908 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
1909 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
1910 | nfs_client_return_marked_delegations(clp); | |
1911 | continue; | |
1912 | } | |
b9efa1b2 AA |
1913 | /* Recall session slots */ |
1914 | if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state) | |
1915 | && nfs4_has_session(clp)) { | |
1916 | status = nfs4_recall_slot(clp); | |
1917 | if (status < 0) | |
1918 | goto out_error; | |
1919 | continue; | |
1920 | } | |
1921 | ||
e005e804 TM |
1922 | |
1923 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
1924 | /* Did we race with an attempt to give us more work? */ |
1925 | if (clp->cl_state == 0) | |
1926 | break; | |
1927 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
1928 | break; | |
47c2199b | 1929 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 1930 | return; |
1da177e4 | 1931 | out_error: |
9a3ba432 | 1932 | pr_warn_ratelimited("NFS: state manager failed on NFSv4 server %s" |
5d8515ca | 1933 | " with error %d\n", clp->cl_hostname, -status); |
5601a00d | 1934 | nfs4_end_drain_session(clp); |
e005e804 TM |
1935 | nfs4_clear_state_manager_bit(clp); |
1936 | } | |
1937 | ||
1938 | static int nfs4_run_state_manager(void *ptr) | |
1939 | { | |
1940 | struct nfs_client *clp = ptr; | |
1941 | ||
1942 | allow_signal(SIGKILL); | |
1943 | nfs4_state_manager(clp); | |
1944 | nfs_put_client(clp); | |
1945 | module_put_and_exit(0); | |
1946 | return 0; | |
1da177e4 LT |
1947 | } |
1948 | ||
1949 | /* | |
1950 | * Local variables: | |
1951 | * c-basic-offset: 8 | |
1952 | * End: | |
1953 | */ |