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 | |
05f4c350 CL |
54 | #include <linux/sunrpc/clnt.h> |
55 | ||
4ce79717 | 56 | #include "nfs4_fs.h" |
1da177e4 LT |
57 | #include "callback.h" |
58 | #include "delegation.h" | |
24c8dbbb | 59 | #include "internal.h" |
76e697ba | 60 | #include "nfs4session.h" |
974cec8c | 61 | #include "pnfs.h" |
bbe0a3aa | 62 | #include "netns.h" |
1da177e4 | 63 | |
e3c0fb7e CL |
64 | #define NFSDBG_FACILITY NFSDBG_STATE |
65 | ||
1da177e4 LT |
66 | #define OPENOWNER_POOL_SIZE 8 |
67 | ||
4ce79717 | 68 | const nfs4_stateid zero_stateid; |
05f4c350 | 69 | static DEFINE_MUTEX(nfs_clid_init_mutex); |
1da177e4 | 70 | |
591d71cb | 71 | int nfs4_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
1da177e4 | 72 | { |
fd954ae1 TM |
73 | struct nfs4_setclientid_res clid = { |
74 | .clientid = clp->cl_clientid, | |
75 | .confirm = clp->cl_confirm, | |
76 | }; | |
f738f517 CL |
77 | unsigned short port; |
78 | int status; | |
bbe0a3aa | 79 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
f738f517 | 80 | |
fd954ae1 TM |
81 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
82 | goto do_confirm; | |
bbe0a3aa | 83 | port = nn->nfs_callback_tcpport; |
f738f517 | 84 | if (clp->cl_addr.ss_family == AF_INET6) |
29dcc16a | 85 | port = nn->nfs_callback_tcpport6; |
f738f517 | 86 | |
bb8b27e5 TM |
87 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
88 | if (status != 0) | |
89 | goto out; | |
fd954ae1 TM |
90 | clp->cl_clientid = clid.clientid; |
91 | clp->cl_confirm = clid.confirm; | |
92 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
93 | do_confirm: | |
bb8b27e5 TM |
94 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); |
95 | if (status != 0) | |
96 | goto out; | |
fd954ae1 | 97 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
bb8b27e5 TM |
98 | nfs4_schedule_state_renewal(clp); |
99 | out: | |
1da177e4 LT |
100 | return status; |
101 | } | |
102 | ||
05f4c350 CL |
103 | /** |
104 | * nfs40_discover_server_trunking - Detect server IP address trunking (mv0) | |
105 | * | |
106 | * @clp: nfs_client under test | |
107 | * @result: OUT: found nfs_client, or clp | |
108 | * @cred: credential to use for trunking test | |
109 | * | |
110 | * Returns zero, a negative errno, or a negative NFS4ERR status. | |
111 | * If zero is returned, an nfs_client pointer is planted in | |
112 | * "result". | |
113 | * | |
114 | * Note: The returned client may not yet be marked ready. | |
115 | */ | |
116 | int nfs40_discover_server_trunking(struct nfs_client *clp, | |
117 | struct nfs_client **result, | |
118 | struct rpc_cred *cred) | |
119 | { | |
120 | struct nfs4_setclientid_res clid = { | |
121 | .clientid = clp->cl_clientid, | |
122 | .confirm = clp->cl_confirm, | |
123 | }; | |
9f62387d | 124 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
05f4c350 CL |
125 | unsigned short port; |
126 | int status; | |
127 | ||
9f62387d | 128 | port = nn->nfs_callback_tcpport; |
05f4c350 | 129 | if (clp->cl_addr.ss_family == AF_INET6) |
9f62387d | 130 | port = nn->nfs_callback_tcpport6; |
05f4c350 CL |
131 | |
132 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); | |
133 | if (status != 0) | |
134 | goto out; | |
135 | clp->cl_clientid = clid.clientid; | |
136 | clp->cl_confirm = clid.confirm; | |
137 | ||
138 | status = nfs40_walk_client_list(clp, result, cred); | |
202c312d | 139 | if (status == 0) { |
05f4c350 CL |
140 | /* Sustain the lease, even if it's empty. If the clientid4 |
141 | * goes stale it's of no use for trunking discovery. */ | |
142 | nfs4_schedule_state_renewal(*result); | |
05f4c350 | 143 | } |
05f4c350 CL |
144 | out: |
145 | return status; | |
146 | } | |
147 | ||
a7b72103 | 148 | struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
a2b2bb88 TM |
149 | { |
150 | struct rpc_cred *cred = NULL; | |
151 | ||
a2b2bb88 TM |
152 | if (clp->cl_machine_cred != NULL) |
153 | cred = get_rpccred(clp->cl_machine_cred); | |
a2b2bb88 TM |
154 | return cred; |
155 | } | |
156 | ||
157 | static void nfs4_clear_machine_cred(struct nfs_client *clp) | |
158 | { | |
159 | struct rpc_cred *cred; | |
160 | ||
161 | spin_lock(&clp->cl_lock); | |
162 | cred = clp->cl_machine_cred; | |
163 | clp->cl_machine_cred = NULL; | |
164 | spin_unlock(&clp->cl_lock); | |
165 | if (cred != NULL) | |
166 | put_rpccred(cred); | |
167 | } | |
168 | ||
24d292b8 CL |
169 | static struct rpc_cred * |
170 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 171 | { |
24d292b8 | 172 | struct rpc_cred *cred = NULL; |
b4454fe1 | 173 | struct nfs4_state_owner *sp; |
9f958ab8 | 174 | struct rb_node *pos; |
b4454fe1 | 175 | |
24d292b8 CL |
176 | for (pos = rb_first(&server->state_owners); |
177 | pos != NULL; | |
178 | pos = rb_next(pos)) { | |
179 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
180 | if (list_empty(&sp->so_states)) |
181 | continue; | |
182 | cred = get_rpccred(sp->so_cred); | |
183 | break; | |
184 | } | |
185 | return cred; | |
186 | } | |
187 | ||
24d292b8 CL |
188 | /** |
189 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
190 | * @clp: client state handle | |
191 | * | |
192 | * Returns an rpc_cred with reference count bumped, or NULL. | |
193 | * Caller must hold clp->cl_lock. | |
194 | */ | |
195 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
196 | { | |
197 | struct rpc_cred *cred = NULL; | |
198 | struct nfs_server *server; | |
199 | ||
e49a29bd SP |
200 | /* Use machine credentials if available */ |
201 | cred = nfs4_get_machine_cred_locked(clp); | |
202 | if (cred != NULL) | |
203 | goto out; | |
204 | ||
24d292b8 CL |
205 | rcu_read_lock(); |
206 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
207 | cred = nfs4_get_renew_cred_server_locked(server); | |
208 | if (cred != NULL) | |
209 | break; | |
210 | } | |
211 | rcu_read_unlock(); | |
e49a29bd SP |
212 | |
213 | out: | |
24d292b8 CL |
214 | return cred; |
215 | } | |
216 | ||
b4b82607 AA |
217 | #if defined(CONFIG_NFS_V4_1) |
218 | ||
9430fb6b RL |
219 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
220 | { | |
221 | int status; | |
222 | struct nfs_fsinfo fsinfo; | |
223 | ||
d6fb79d4 AA |
224 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
225 | nfs4_schedule_state_renewal(clp); | |
226 | return 0; | |
227 | } | |
228 | ||
9430fb6b RL |
229 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
230 | if (status == 0) { | |
231 | /* Update lease time and schedule renewal */ | |
232 | spin_lock(&clp->cl_lock); | |
233 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
234 | clp->cl_last_renewal = jiffies; | |
235 | spin_unlock(&clp->cl_lock); | |
236 | ||
237 | nfs4_schedule_state_renewal(clp); | |
238 | } | |
239 | ||
240 | return status; | |
241 | } | |
242 | ||
42acd021 AA |
243 | /* |
244 | * Back channel returns NFS4ERR_DELAY for new requests when | |
245 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
246 | * is ended. | |
247 | */ | |
5601a00d | 248 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 249 | { |
5601a00d | 250 | struct nfs4_session *ses = clp->cl_session; |
961a828d | 251 | struct nfs4_slot_table *tbl; |
689cf5c1 | 252 | |
a2118c33 TM |
253 | if (ses == NULL) |
254 | return; | |
961a828d | 255 | tbl = &ses->fc_slot_table; |
a2118c33 | 256 | if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) { |
961a828d | 257 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 258 | nfs41_wake_slot_table(tbl); |
961a828d | 259 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 260 | } |
9dfdf404 RL |
261 | } |
262 | ||
5d63360d TM |
263 | /* |
264 | * Signal state manager thread if session fore channel is drained | |
265 | */ | |
266 | void nfs4_session_drain_complete(struct nfs4_session *session, | |
267 | struct nfs4_slot_table *tbl) | |
268 | { | |
269 | if (nfs4_session_draining(session)) | |
270 | complete(&tbl->complete); | |
271 | } | |
272 | ||
42acd021 | 273 | static int nfs4_wait_on_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 274 | { |
9dfdf404 | 275 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 276 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 277 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 278 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 279 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
280 | } |
281 | spin_unlock(&tbl->slot_tbl_lock); | |
282 | return 0; | |
283 | } | |
284 | ||
42acd021 AA |
285 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
286 | { | |
287 | struct nfs4_session *ses = clp->cl_session; | |
288 | int ret = 0; | |
289 | ||
290 | set_bit(NFS4_SESSION_DRAINING, &ses->session_state); | |
291 | /* back channel */ | |
292 | ret = nfs4_wait_on_slot_tbl(&ses->bc_slot_table); | |
293 | if (ret) | |
294 | return ret; | |
295 | /* fore channel */ | |
296 | return nfs4_wait_on_slot_tbl(&ses->fc_slot_table); | |
297 | } | |
298 | ||
bda197f5 TM |
299 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
300 | { | |
301 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
302 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
303 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
304 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
305 | nfs41_setup_state_renewal(clp); | |
306 | } | |
307 | ||
4d643d1d AA |
308 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
309 | { | |
310 | int status; | |
311 | ||
fd954ae1 TM |
312 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
313 | goto do_confirm; | |
38045412 | 314 | nfs4_begin_drain_session(clp); |
4d643d1d | 315 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
316 | if (status != 0) |
317 | goto out; | |
fd954ae1 TM |
318 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
319 | do_confirm: | |
848f5bda | 320 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
321 | if (status != 0) |
322 | goto out; | |
bda197f5 | 323 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
324 | nfs_mark_client_ready(clp, NFS_CS_READY); |
325 | out: | |
4d643d1d AA |
326 | return status; |
327 | } | |
328 | ||
05f4c350 CL |
329 | /** |
330 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
331 | * | |
332 | * @clp: nfs_client under test | |
333 | * @result: OUT: found nfs_client, or clp | |
334 | * @cred: credential to use for trunking test | |
335 | * | |
336 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
337 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
338 | * "result". | |
339 | * | |
340 | * Note: The returned client may not yet be marked ready. | |
341 | */ | |
342 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
343 | struct nfs_client **result, | |
344 | struct rpc_cred *cred) | |
345 | { | |
346 | int status; | |
347 | ||
348 | status = nfs4_proc_exchange_id(clp, cred); | |
349 | if (status != NFS4_OK) | |
350 | return status; | |
fd483570 | 351 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
05f4c350 CL |
352 | |
353 | return nfs41_walk_client_list(clp, result, cred); | |
354 | } | |
355 | ||
b4b82607 AA |
356 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
357 | { | |
358 | struct rpc_cred *cred; | |
359 | ||
360 | spin_lock(&clp->cl_lock); | |
361 | cred = nfs4_get_machine_cred_locked(clp); | |
362 | spin_unlock(&clp->cl_lock); | |
363 | return cred; | |
364 | } | |
365 | ||
366 | #endif /* CONFIG_NFS_V4_1 */ | |
367 | ||
24d292b8 CL |
368 | static struct rpc_cred * |
369 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 370 | { |
24d292b8 CL |
371 | struct nfs_client *clp = server->nfs_client; |
372 | struct rpc_cred *cred = NULL; | |
286d7d6a | 373 | struct nfs4_state_owner *sp; |
9f958ab8 | 374 | struct rb_node *pos; |
24d292b8 CL |
375 | |
376 | spin_lock(&clp->cl_lock); | |
377 | pos = rb_first(&server->state_owners); | |
378 | if (pos != NULL) { | |
379 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
380 | cred = get_rpccred(sp->so_cred); | |
381 | } | |
382 | spin_unlock(&clp->cl_lock); | |
383 | return cred; | |
384 | } | |
385 | ||
386 | /** | |
387 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
388 | * @clp: client state handle | |
389 | * | |
390 | * Returns an rpc_cred with reference count bumped, or NULL. | |
391 | */ | |
392 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
393 | { | |
394 | struct nfs_server *server; | |
a2b2bb88 | 395 | struct rpc_cred *cred; |
286d7d6a | 396 | |
6dc9d57a TM |
397 | spin_lock(&clp->cl_lock); |
398 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 399 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
400 | if (cred != NULL) |
401 | goto out; | |
24d292b8 CL |
402 | |
403 | rcu_read_lock(); | |
404 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
405 | cred = nfs4_get_setclientid_cred_server(server); | |
406 | if (cred != NULL) | |
407 | break; | |
286d7d6a | 408 | } |
24d292b8 CL |
409 | rcu_read_unlock(); |
410 | ||
a2b2bb88 TM |
411 | out: |
412 | return cred; | |
286d7d6a TM |
413 | } |
414 | ||
1da177e4 | 415 | static struct nfs4_state_owner * |
24d292b8 | 416 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 417 | { |
24d292b8 | 418 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 419 | *parent = NULL; |
414adf14 | 420 | struct nfs4_state_owner *sp; |
1da177e4 | 421 | |
9f958ab8 TM |
422 | while (*p != NULL) { |
423 | parent = *p; | |
24d292b8 | 424 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
425 | |
426 | if (cred < sp->so_cred) | |
427 | p = &parent->rb_left; | |
428 | else if (cred > sp->so_cred) | |
429 | p = &parent->rb_right; | |
430 | else { | |
0aaaf5c4 CL |
431 | if (!list_empty(&sp->so_lru)) |
432 | list_del_init(&sp->so_lru); | |
9f958ab8 | 433 | atomic_inc(&sp->so_count); |
414adf14 | 434 | return sp; |
9f958ab8 | 435 | } |
1da177e4 | 436 | } |
414adf14 | 437 | return NULL; |
1da177e4 LT |
438 | } |
439 | ||
9f958ab8 | 440 | static struct nfs4_state_owner * |
24d292b8 | 441 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 442 | { |
24d292b8 CL |
443 | struct nfs_server *server = new->so_server; |
444 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
445 | *parent = NULL; |
446 | struct nfs4_state_owner *sp; | |
9157c31d | 447 | int err; |
9f958ab8 TM |
448 | |
449 | while (*p != NULL) { | |
450 | parent = *p; | |
24d292b8 | 451 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
452 | |
453 | if (new->so_cred < sp->so_cred) | |
454 | p = &parent->rb_left; | |
455 | else if (new->so_cred > sp->so_cred) | |
456 | p = &parent->rb_right; | |
457 | else { | |
0aaaf5c4 CL |
458 | if (!list_empty(&sp->so_lru)) |
459 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
460 | atomic_inc(&sp->so_count); |
461 | return sp; | |
462 | } | |
463 | } | |
48c22eb2 | 464 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
465 | if (err) |
466 | return ERR_PTR(err); | |
24d292b8 CL |
467 | rb_link_node(&new->so_server_node, parent, p); |
468 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
469 | return new; |
470 | } | |
471 | ||
472 | static void | |
24d292b8 | 473 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 474 | { |
24d292b8 CL |
475 | struct nfs_server *server = sp->so_server; |
476 | ||
477 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
478 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 479 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
480 | } |
481 | ||
7ba127ab TM |
482 | static void |
483 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
484 | { | |
95b72eb0 | 485 | sc->create_time = ktime_get(); |
7ba127ab TM |
486 | sc->flags = 0; |
487 | sc->counter = 0; | |
488 | spin_lock_init(&sc->lock); | |
489 | INIT_LIST_HEAD(&sc->list); | |
490 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
491 | } | |
492 | ||
493 | static void | |
494 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
495 | { | |
496 | rpc_destroy_wait_queue(&sc->wait); | |
497 | } | |
498 | ||
1da177e4 LT |
499 | /* |
500 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
501 | * create a new state_owner. | |
502 | * | |
503 | */ | |
504 | static struct nfs4_state_owner * | |
d1e284d5 TM |
505 | nfs4_alloc_state_owner(struct nfs_server *server, |
506 | struct rpc_cred *cred, | |
507 | gfp_t gfp_flags) | |
1da177e4 LT |
508 | { |
509 | struct nfs4_state_owner *sp; | |
510 | ||
d1e284d5 | 511 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
512 | if (!sp) |
513 | return NULL; | |
d1e284d5 TM |
514 | sp->so_server = server; |
515 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 516 | spin_lock_init(&sp->so_lock); |
1da177e4 | 517 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 518 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 519 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 520 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 521 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 522 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
523 | return sp; |
524 | } | |
525 | ||
1d2e88e7 | 526 | static void |
1da177e4 LT |
527 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
528 | { | |
c77365c9 TM |
529 | struct rb_node *rb_node = &sp->so_server_node; |
530 | ||
531 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
532 | struct nfs_server *server = sp->so_server; |
533 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
534 | |
535 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
536 | if (!RB_EMPTY_NODE(rb_node)) { |
537 | rb_erase(rb_node, &server->state_owners); | |
538 | RB_CLEAR_NODE(rb_node); | |
539 | } | |
9f958ab8 TM |
540 | spin_unlock(&clp->cl_lock); |
541 | } | |
1da177e4 LT |
542 | } |
543 | ||
0aaaf5c4 CL |
544 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
545 | { | |
7ba127ab | 546 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
547 | put_rpccred(sp->so_cred); |
548 | kfree(sp); | |
549 | } | |
550 | ||
551 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
552 | { | |
553 | struct nfs_client *clp = server->nfs_client; | |
554 | struct nfs4_state_owner *sp, *tmp; | |
555 | unsigned long time_min, time_max; | |
556 | LIST_HEAD(doomed); | |
557 | ||
558 | spin_lock(&clp->cl_lock); | |
559 | time_max = jiffies; | |
560 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
561 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
562 | /* NB: LRU is sorted so that oldest is at the head */ | |
563 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
564 | break; | |
565 | list_move(&sp->so_lru, &doomed); | |
566 | nfs4_remove_state_owner_locked(sp); | |
567 | } | |
568 | spin_unlock(&clp->cl_lock); | |
569 | ||
570 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
571 | list_del(&sp->so_lru); | |
572 | nfs4_free_state_owner(sp); | |
573 | } | |
574 | } | |
575 | ||
24d292b8 CL |
576 | /** |
577 | * nfs4_get_state_owner - Look up a state owner given a credential | |
578 | * @server: nfs_server to search | |
579 | * @cred: RPC credential to match | |
580 | * | |
581 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
582 | */ | |
583 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
584 | struct rpc_cred *cred, |
585 | gfp_t gfp_flags) | |
1da177e4 | 586 | { |
7539bbab | 587 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
588 | struct nfs4_state_owner *sp, *new; |
589 | ||
1da177e4 | 590 | spin_lock(&clp->cl_lock); |
24d292b8 | 591 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 592 | spin_unlock(&clp->cl_lock); |
1da177e4 | 593 | if (sp != NULL) |
0aaaf5c4 | 594 | goto out; |
d1e284d5 | 595 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 596 | if (new == NULL) |
0aaaf5c4 | 597 | goto out; |
9157c31d TM |
598 | do { |
599 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
600 | break; | |
601 | spin_lock(&clp->cl_lock); | |
602 | sp = nfs4_insert_state_owner_locked(new); | |
603 | spin_unlock(&clp->cl_lock); | |
604 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
605 | if (sp != new) |
606 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
607 | out: |
608 | nfs4_gc_state_owners(server); | |
9f958ab8 | 609 | return sp; |
1da177e4 LT |
610 | } |
611 | ||
24d292b8 CL |
612 | /** |
613 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
614 | * @sp: state owner data to release | |
7bf97bc2 TM |
615 | * |
616 | * Note that we keep released state owners on an LRU | |
617 | * list. | |
618 | * This caches valid state owners so that they can be | |
619 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
620 | * It also pins the uniquifier of dropped state owners for | |
621 | * a while, to ensure that those state owner names are | |
622 | * never reused. | |
24d292b8 | 623 | */ |
1da177e4 LT |
624 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
625 | { | |
0aaaf5c4 CL |
626 | struct nfs_server *server = sp->so_server; |
627 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
628 | |
629 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
630 | return; | |
0aaaf5c4 | 631 | |
7bf97bc2 TM |
632 | sp->so_expires = jiffies; |
633 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
634 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
635 | } |
636 | ||
637 | /** | |
638 | * nfs4_purge_state_owners - Release all cached state owners | |
639 | * @server: nfs_server with cached state owners to release | |
640 | * | |
641 | * Called at umount time. Remaining state owners will be on | |
642 | * the LRU with ref count of zero. | |
643 | */ | |
644 | void nfs4_purge_state_owners(struct nfs_server *server) | |
645 | { | |
646 | struct nfs_client *clp = server->nfs_client; | |
647 | struct nfs4_state_owner *sp, *tmp; | |
648 | LIST_HEAD(doomed); | |
649 | ||
650 | spin_lock(&clp->cl_lock); | |
651 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
652 | list_move(&sp->so_lru, &doomed); | |
653 | nfs4_remove_state_owner_locked(sp); | |
654 | } | |
1da177e4 | 655 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
656 | |
657 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
658 | list_del(&sp->so_lru); | |
659 | nfs4_free_state_owner(sp); | |
660 | } | |
1da177e4 LT |
661 | } |
662 | ||
663 | static struct nfs4_state * | |
664 | nfs4_alloc_open_state(void) | |
665 | { | |
666 | struct nfs4_state *state; | |
667 | ||
8535b2be | 668 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
669 | if (!state) |
670 | return NULL; | |
1da177e4 LT |
671 | atomic_set(&state->count, 1); |
672 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 673 | spin_lock_init(&state->state_lock); |
8bda4e4c | 674 | seqlock_init(&state->seqlock); |
1da177e4 LT |
675 | return state; |
676 | } | |
677 | ||
4cecb76f | 678 | void |
dc0b027d | 679 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 680 | { |
dc0b027d | 681 | if (state->state == fmode) |
4cecb76f TM |
682 | return; |
683 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
684 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
685 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
686 | list_move(&state->open_states, &state->owner->so_states); |
687 | else | |
688 | list_move_tail(&state->open_states, &state->owner->so_states); | |
689 | } | |
dc0b027d | 690 | state->state = fmode; |
4cecb76f TM |
691 | } |
692 | ||
1da177e4 LT |
693 | static struct nfs4_state * |
694 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
695 | { | |
696 | struct nfs_inode *nfsi = NFS_I(inode); | |
697 | struct nfs4_state *state; | |
698 | ||
699 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 700 | if (state->owner != owner) |
1da177e4 | 701 | continue; |
5d422301 TM |
702 | if (!nfs4_valid_open_stateid(state)) |
703 | continue; | |
1c816efa | 704 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 705 | return state; |
1da177e4 LT |
706 | } |
707 | return NULL; | |
708 | } | |
709 | ||
1da177e4 LT |
710 | static void |
711 | nfs4_free_open_state(struct nfs4_state *state) | |
712 | { | |
713 | kfree(state); | |
714 | } | |
715 | ||
716 | struct nfs4_state * | |
717 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
718 | { | |
719 | struct nfs4_state *state, *new; | |
720 | struct nfs_inode *nfsi = NFS_I(inode); | |
721 | ||
722 | spin_lock(&inode->i_lock); | |
723 | state = __nfs4_find_state_byowner(inode, owner); | |
724 | spin_unlock(&inode->i_lock); | |
725 | if (state) | |
726 | goto out; | |
727 | new = nfs4_alloc_open_state(); | |
ec073428 | 728 | spin_lock(&owner->so_lock); |
1da177e4 LT |
729 | spin_lock(&inode->i_lock); |
730 | state = __nfs4_find_state_byowner(inode, owner); | |
731 | if (state == NULL && new != NULL) { | |
732 | state = new; | |
1da177e4 LT |
733 | state->owner = owner; |
734 | atomic_inc(&owner->so_count); | |
735 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
736 | ihold(inode); |
737 | state->inode = inode; | |
1da177e4 | 738 | spin_unlock(&inode->i_lock); |
ec073428 TM |
739 | /* Note: The reclaim code dictates that we add stateless |
740 | * and read-only stateids to the end of the list */ | |
741 | list_add_tail(&state->open_states, &owner->so_states); | |
742 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
743 | } else { |
744 | spin_unlock(&inode->i_lock); | |
ec073428 | 745 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
746 | if (new) |
747 | nfs4_free_open_state(new); | |
748 | } | |
749 | out: | |
750 | return state; | |
751 | } | |
752 | ||
1da177e4 LT |
753 | void nfs4_put_open_state(struct nfs4_state *state) |
754 | { | |
755 | struct inode *inode = state->inode; | |
756 | struct nfs4_state_owner *owner = state->owner; | |
757 | ||
ec073428 | 758 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 759 | return; |
ec073428 | 760 | spin_lock(&inode->i_lock); |
ba683031 | 761 | list_del(&state->inode_states); |
1da177e4 | 762 | list_del(&state->open_states); |
ec073428 TM |
763 | spin_unlock(&inode->i_lock); |
764 | spin_unlock(&owner->so_lock); | |
1da177e4 | 765 | iput(inode); |
1da177e4 LT |
766 | nfs4_free_open_state(state); |
767 | nfs4_put_state_owner(owner); | |
768 | } | |
769 | ||
770 | /* | |
83c9d41e | 771 | * Close the current file. |
1da177e4 | 772 | */ |
643168c2 | 773 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 774 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 775 | { |
1da177e4 | 776 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 777 | int call_close = 0; |
dc0b027d | 778 | fmode_t newstate; |
1da177e4 LT |
779 | |
780 | atomic_inc(&owner->so_count); | |
1da177e4 | 781 | /* Protect against nfs4_find_state() */ |
ec073428 | 782 | spin_lock(&owner->so_lock); |
dc0b027d | 783 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
784 | case FMODE_READ: |
785 | state->n_rdonly--; | |
786 | break; | |
787 | case FMODE_WRITE: | |
788 | state->n_wronly--; | |
789 | break; | |
790 | case FMODE_READ|FMODE_WRITE: | |
791 | state->n_rdwr--; | |
792 | } | |
003707c7 | 793 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 794 | if (state->n_rdwr == 0) { |
003707c7 | 795 | if (state->n_rdonly == 0) { |
e7616923 | 796 | newstate &= ~FMODE_READ; |
003707c7 TM |
797 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
798 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
799 | } | |
800 | if (state->n_wronly == 0) { | |
e7616923 | 801 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
802 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
803 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
804 | } | |
805 | if (newstate == 0) | |
806 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 807 | } |
003707c7 | 808 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 809 | spin_unlock(&owner->so_lock); |
4cecb76f | 810 | |
003707c7 | 811 | if (!call_close) { |
b39e625b TM |
812 | nfs4_put_open_state(state); |
813 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
814 | } else |
815 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
816 | } |
817 | ||
643168c2 | 818 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 819 | { |
643168c2 | 820 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
821 | } |
822 | ||
643168c2 | 823 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 824 | { |
643168c2 | 825 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
826 | } |
827 | ||
828 | /* | |
829 | * Search the state->lock_states for an existing lock_owner | |
830 | * that is compatible with current->files | |
831 | */ | |
832 | static struct nfs4_lock_state * | |
77041ed9 | 833 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
834 | { |
835 | struct nfs4_lock_state *pos; | |
836 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 837 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 838 | continue; |
77041ed9 TM |
839 | switch (pos->ls_owner.lo_type) { |
840 | case NFS4_POSIX_LOCK_TYPE: | |
841 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
842 | continue; | |
843 | break; | |
844 | case NFS4_FLOCK_LOCK_TYPE: | |
845 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
846 | continue; | |
847 | } | |
1da177e4 LT |
848 | atomic_inc(&pos->ls_count); |
849 | return pos; | |
850 | } | |
851 | return NULL; | |
852 | } | |
853 | ||
1da177e4 LT |
854 | /* |
855 | * Return a compatible lock_state. If no initialized lock_state structure | |
856 | * exists, return an uninitialized one. | |
857 | * | |
1da177e4 | 858 | */ |
77041ed9 | 859 | 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 |
860 | { |
861 | struct nfs4_lock_state *lsp; | |
24d292b8 | 862 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 863 | |
8535b2be | 864 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
865 | if (lsp == NULL) |
866 | return NULL; | |
7ba127ab | 867 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 868 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 869 | lsp->ls_state = state; |
77041ed9 TM |
870 | lsp->ls_owner.lo_type = type; |
871 | switch (lsp->ls_owner.lo_type) { | |
872 | case NFS4_FLOCK_LOCK_TYPE: | |
873 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
874 | break; | |
875 | case NFS4_POSIX_LOCK_TYPE: | |
876 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
877 | break; | |
878 | default: | |
d2d7ce28 | 879 | goto out_free; |
77041ed9 | 880 | } |
48c22eb2 TM |
881 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
882 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 883 | goto out_free; |
8d0a8a9d | 884 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 885 | return lsp; |
d2d7ce28 TM |
886 | out_free: |
887 | kfree(lsp); | |
888 | return NULL; | |
1da177e4 LT |
889 | } |
890 | ||
5ae67c4f | 891 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 892 | { |
48c22eb2 | 893 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 894 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
895 | kfree(lsp); |
896 | } | |
897 | ||
1da177e4 LT |
898 | /* |
899 | * Return a compatible lock_state. If no initialized lock_state structure | |
900 | * exists, return an uninitialized one. | |
901 | * | |
1da177e4 | 902 | */ |
77041ed9 | 903 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 904 | { |
8d0a8a9d | 905 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 906 | |
8d0a8a9d TM |
907 | for(;;) { |
908 | spin_lock(&state->state_lock); | |
77041ed9 | 909 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
910 | if (lsp != NULL) |
911 | break; | |
912 | if (new != NULL) { | |
8d0a8a9d TM |
913 | list_add(&new->ls_locks, &state->lock_states); |
914 | set_bit(LK_STATE_IN_USE, &state->flags); | |
915 | lsp = new; | |
916 | new = NULL; | |
917 | break; | |
918 | } | |
919 | spin_unlock(&state->state_lock); | |
77041ed9 | 920 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
921 | if (new == NULL) |
922 | return NULL; | |
923 | } | |
924 | spin_unlock(&state->state_lock); | |
9f958ab8 | 925 | if (new != NULL) |
5ae67c4f | 926 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
927 | return lsp; |
928 | } | |
929 | ||
930 | /* | |
8d0a8a9d TM |
931 | * Release reference to lock_state, and free it if we see that |
932 | * it is no longer in use | |
1da177e4 | 933 | */ |
faf5f49c | 934 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 935 | { |
8d0a8a9d | 936 | struct nfs4_state *state; |
1da177e4 | 937 | |
8d0a8a9d TM |
938 | if (lsp == NULL) |
939 | return; | |
940 | state = lsp->ls_state; | |
941 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
942 | return; | |
943 | list_del(&lsp->ls_locks); | |
944 | if (list_empty(&state->lock_states)) | |
945 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
946 | spin_unlock(&state->state_lock); | |
795a88c9 | 947 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
cf470c3e TM |
948 | if (nfs4_release_lockowner(lsp) == 0) |
949 | return; | |
950 | } | |
5ae67c4f | 951 | nfs4_free_lock_state(lsp->ls_state->owner->so_server, lsp); |
1da177e4 LT |
952 | } |
953 | ||
8d0a8a9d | 954 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 955 | { |
8d0a8a9d | 956 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 957 | |
8d0a8a9d TM |
958 | dst->fl_u.nfs4_fl.owner = lsp; |
959 | atomic_inc(&lsp->ls_count); | |
960 | } | |
1da177e4 | 961 | |
8d0a8a9d | 962 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 963 | { |
8d0a8a9d | 964 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
965 | } |
966 | ||
6aed6285 | 967 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
968 | .fl_copy_lock = nfs4_fl_copy_lock, |
969 | .fl_release_private = nfs4_fl_release_lock, | |
970 | }; | |
971 | ||
972 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 973 | { |
8d0a8a9d TM |
974 | struct nfs4_lock_state *lsp; |
975 | ||
976 | if (fl->fl_ops != NULL) | |
977 | return 0; | |
77041ed9 TM |
978 | if (fl->fl_flags & FL_POSIX) |
979 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
980 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
981 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
982 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
983 | else |
984 | return -EINVAL; | |
8d0a8a9d TM |
985 | if (lsp == NULL) |
986 | return -ENOMEM; | |
987 | fl->fl_u.nfs4_fl.owner = lsp; | |
988 | fl->fl_ops = &nfs4_fl_lock_ops; | |
989 | return 0; | |
1da177e4 LT |
990 | } |
991 | ||
4fc8796d | 992 | static bool nfs4_copy_lock_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
2a369153 | 993 | const struct nfs_lockowner *lockowner) |
1da177e4 | 994 | { |
8d0a8a9d | 995 | struct nfs4_lock_state *lsp; |
2a369153 TM |
996 | fl_owner_t fl_owner; |
997 | pid_t fl_pid; | |
4fc8796d | 998 | bool ret = false; |
1da177e4 | 999 | |
2a369153 TM |
1000 | |
1001 | if (lockowner == NULL) | |
1002 | goto out; | |
1003 | ||
8d0a8a9d | 1004 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 1005 | goto out; |
1da177e4 | 1006 | |
2a369153 TM |
1007 | fl_owner = lockowner->l_owner; |
1008 | fl_pid = lockowner->l_pid; | |
8d0a8a9d | 1009 | spin_lock(&state->state_lock); |
77041ed9 | 1010 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
795a88c9 | 1011 | if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
f597c537 | 1012 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
4fc8796d TM |
1013 | ret = true; |
1014 | } | |
8d0a8a9d | 1015 | spin_unlock(&state->state_lock); |
1da177e4 | 1016 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
1017 | out: |
1018 | return ret; | |
1019 | } | |
1020 | ||
1021 | static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) | |
1022 | { | |
1023 | int seq; | |
1024 | ||
1025 | do { | |
1026 | seq = read_seqbegin(&state->seqlock); | |
1027 | nfs4_stateid_copy(dst, &state->stateid); | |
1028 | } while (read_seqretry(&state->seqlock, seq)); | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1033 | * requests. | |
1034 | */ | |
1035 | void nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, | |
2a369153 | 1036 | fmode_t fmode, const struct nfs_lockowner *lockowner) |
4fc8796d TM |
1037 | { |
1038 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) | |
1039 | return; | |
2a369153 | 1040 | if (nfs4_copy_lock_stateid(dst, state, lockowner)) |
4fc8796d TM |
1041 | return; |
1042 | nfs4_copy_open_stateid(dst, state); | |
1da177e4 LT |
1043 | } |
1044 | ||
8535b2be | 1045 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1046 | { |
cee54fc9 TM |
1047 | struct nfs_seqid *new; |
1048 | ||
8535b2be | 1049 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
1050 | if (new != NULL) { |
1051 | new->sequence = counter; | |
2f74c0a0 | 1052 | INIT_LIST_HEAD(&new->list); |
4601df20 | 1053 | new->task = NULL; |
cee54fc9 TM |
1054 | } |
1055 | return new; | |
1056 | } | |
1057 | ||
72211dbe | 1058 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1059 | { |
4601df20 | 1060 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1061 | |
4601df20 TM |
1062 | if (list_empty(&seqid->list)) |
1063 | return; | |
1064 | sequence = seqid->sequence; | |
1065 | spin_lock(&sequence->lock); | |
1066 | list_del_init(&seqid->list); | |
1067 | if (!list_empty(&sequence->list)) { | |
1068 | struct nfs_seqid *next; | |
1069 | ||
1070 | next = list_first_entry(&sequence->list, | |
1071 | struct nfs_seqid, list); | |
1072 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1073 | } |
4601df20 | 1074 | spin_unlock(&sequence->lock); |
72211dbe TM |
1075 | } |
1076 | ||
1077 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1078 | { | |
1079 | nfs_release_seqid(seqid); | |
cee54fc9 | 1080 | kfree(seqid); |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | /* | |
cee54fc9 TM |
1084 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1085 | * failed with a seqid incrementing error - | |
1086 | * see comments nfs_fs.h:seqid_mutating_error() | |
1087 | */ | |
88d90939 | 1088 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1089 | { |
1090 | switch (status) { | |
1091 | case 0: | |
1092 | break; | |
1093 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1094 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1095 | return; | |
9a3ba432 | 1096 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1097 | " sequence-id error on an" |
1098 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1099 | seqid->sequence); |
cee54fc9 TM |
1100 | case -NFS4ERR_STALE_CLIENTID: |
1101 | case -NFS4ERR_STALE_STATEID: | |
1102 | case -NFS4ERR_BAD_STATEID: | |
1103 | case -NFS4ERR_BADXDR: | |
1104 | case -NFS4ERR_RESOURCE: | |
1105 | case -NFS4ERR_NOFILEHANDLE: | |
1106 | /* Non-seqid mutating errors */ | |
1107 | return; | |
1108 | }; | |
1109 | /* | |
1110 | * Note: no locking needed as we are guaranteed to be first | |
1111 | * on the sequence list | |
1112 | */ | |
1113 | seqid->sequence->counter++; | |
1114 | } | |
1115 | ||
1116 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1117 | { | |
34dc1ad7 BH |
1118 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1119 | struct nfs4_state_owner, so_seqid); | |
1120 | struct nfs_server *server = sp->so_server; | |
1121 | ||
1122 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1123 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1124 | if (!nfs4_has_session(server->nfs_client)) |
1125 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1126 | } |
1127 | ||
1128 | /* | |
cee54fc9 TM |
1129 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1130 | * failed with a seqid incrementing error - | |
1131 | * see comments nfs_fs.h:seqid_mutating_error() | |
1132 | */ | |
1133 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1134 | { | |
88d90939 | 1135 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1136 | } |
1137 | ||
1138 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1139 | { | |
7ba127ab | 1140 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1141 | int status = 0; |
1142 | ||
1143 | spin_lock(&sequence->lock); | |
4601df20 | 1144 | seqid->task = task; |
2f74c0a0 TM |
1145 | if (list_empty(&seqid->list)) |
1146 | list_add_tail(&seqid->list, &sequence->list); | |
1147 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1148 | goto unlock; | |
5d00837b | 1149 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1150 | status = -EAGAIN; |
1151 | unlock: | |
cee54fc9 TM |
1152 | spin_unlock(&sequence->lock); |
1153 | return status; | |
1da177e4 LT |
1154 | } |
1155 | ||
e005e804 | 1156 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1157 | |
e005e804 | 1158 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1159 | { |
1160 | smp_mb__before_clear_bit(); | |
e005e804 | 1161 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1162 | smp_mb__after_clear_bit(); |
e005e804 | 1163 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1164 | rpc_wake_up(&clp->cl_rpcwaitq); |
1165 | } | |
1166 | ||
1da177e4 | 1167 | /* |
e005e804 | 1168 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1169 | */ |
b0d3ded1 | 1170 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1171 | { |
5043e900 | 1172 | struct task_struct *task; |
2446ab60 | 1173 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1174 | |
e005e804 TM |
1175 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1176 | return; | |
5043e900 TM |
1177 | __module_get(THIS_MODULE); |
1178 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1179 | |
1180 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1181 | * manager is the only thread that ever changes the rpc_xprt | |
1182 | * after it's initialized. At this point, we're single threaded. */ | |
1183 | rcu_read_lock(); | |
1184 | snprintf(buf, sizeof(buf), "%s-manager", | |
1185 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1186 | rcu_read_unlock(); | |
1187 | task = kthread_run(nfs4_run_state_manager, clp, buf); | |
1188 | if (IS_ERR(task)) { | |
1189 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1190 | __func__, PTR_ERR(task)); | |
1191 | nfs4_clear_state_manager_bit(clp); | |
1192 | nfs_put_client(clp); | |
1193 | module_put(THIS_MODULE); | |
1194 | } | |
1da177e4 LT |
1195 | } |
1196 | ||
1197 | /* | |
0400a6b0 | 1198 | * Schedule a lease recovery attempt |
1da177e4 | 1199 | */ |
0400a6b0 | 1200 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1201 | { |
1202 | if (!clp) | |
1203 | return; | |
e598d843 TM |
1204 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1205 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1206 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1207 | clp->cl_hostname); | |
e005e804 | 1208 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1209 | } |
9cb81968 | 1210 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1211 | |
33021279 TM |
1212 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1213 | { | |
1214 | int res; | |
1215 | ||
1216 | might_sleep(); | |
1217 | ||
1218 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, | |
1219 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1220 | if (res) | |
1221 | return res; | |
1222 | ||
1223 | if (clp->cl_cons_state < 0) | |
1224 | return clp->cl_cons_state; | |
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1229 | { | |
1230 | unsigned int loop; | |
1231 | int ret; | |
1232 | ||
1233 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1234 | ret = nfs4_wait_clnt_recover(clp); | |
1235 | if (ret != 0) | |
1236 | break; | |
1237 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1238 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1239 | break; | |
1240 | nfs4_schedule_state_manager(clp); | |
1241 | ret = -EIO; | |
1242 | } | |
1243 | return ret; | |
1244 | } | |
1245 | ||
ad1e3968 TM |
1246 | /* |
1247 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1248 | * @clp: client to process | |
1249 | * | |
1250 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1251 | * resend of the SETCLIENTID and hence re-establish the | |
1252 | * callback channel. Then return all existing delegations. | |
1253 | */ | |
1254 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1255 | { | |
1256 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1257 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1258 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1259 | clp->cl_hostname); | |
ad1e3968 TM |
1260 | } |
1261 | ||
042b60be TM |
1262 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1263 | { | |
ad1e3968 | 1264 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1265 | nfs4_schedule_state_manager(clp); |
1266 | } | |
1267 | ||
f9feab1e | 1268 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1269 | { |
1270 | ||
1271 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1272 | /* Don't recover state that expired before the reboot */ | |
1273 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1274 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1275 | return 0; | |
1276 | } | |
7eff03ae | 1277 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1278 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1279 | return 1; | |
1280 | } | |
1281 | ||
f9feab1e | 1282 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1283 | { |
1284 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1285 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1286 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1287 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1288 | return 1; | |
1289 | } | |
1290 | ||
5d422301 | 1291 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1292 | { |
1293 | struct nfs_client *clp = server->nfs_client; | |
1294 | ||
5d422301 TM |
1295 | if (!nfs4_valid_open_stateid(state)) |
1296 | return -EBADF; | |
0400a6b0 | 1297 | nfs4_state_mark_reclaim_nograce(clp, state); |
cc0a9843 TM |
1298 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1299 | clp->cl_hostname); | |
0400a6b0 | 1300 | nfs4_schedule_state_manager(clp); |
5d422301 | 1301 | return 0; |
0400a6b0 | 1302 | } |
9cb81968 | 1303 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1304 | |
a1d0b5ee TM |
1305 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1306 | const nfs4_stateid *stateid) | |
1307 | { | |
1308 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1309 | struct nfs_inode *nfsi = NFS_I(inode); | |
1310 | struct nfs_open_context *ctx; | |
1311 | struct nfs4_state *state; | |
1312 | bool found = false; | |
1313 | ||
1314 | spin_lock(&inode->i_lock); | |
1315 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1316 | state = ctx->state; | |
1317 | if (state == NULL) | |
1318 | continue; | |
1319 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1320 | continue; | |
f597c537 | 1321 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1322 | continue; |
1323 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1324 | found = true; | |
1325 | } | |
1326 | spin_unlock(&inode->i_lock); | |
1327 | if (found) | |
1328 | nfs4_schedule_state_manager(clp); | |
1329 | } | |
1330 | ||
5d422301 TM |
1331 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1332 | { | |
1333 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
1334 | } | |
1335 | ||
a1d0b5ee | 1336 | |
02860014 | 1337 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1338 | { |
1339 | struct inode *inode = state->inode; | |
19e03c57 | 1340 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1341 | struct file_lock *fl; |
1342 | int status = 0; | |
1343 | ||
3f09df70 TM |
1344 | if (inode->i_flock == NULL) |
1345 | return 0; | |
1346 | ||
1347 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1348 | down_write(&nfsi->rwsem); |
3f09df70 | 1349 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1350 | lock_flocks(); |
90dc7d27 | 1351 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1352 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1353 | continue; |
cd3758e3 | 1354 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1355 | continue; |
b89f4321 | 1356 | unlock_flocks(); |
1da177e4 | 1357 | status = ops->recover_lock(state, fl); |
1da177e4 | 1358 | switch (status) { |
965b5d67 TM |
1359 | case 0: |
1360 | break; | |
1361 | case -ESTALE: | |
1362 | case -NFS4ERR_ADMIN_REVOKED: | |
1363 | case -NFS4ERR_STALE_STATEID: | |
1364 | case -NFS4ERR_BAD_STATEID: | |
1365 | case -NFS4ERR_EXPIRED: | |
1366 | case -NFS4ERR_NO_GRACE: | |
1367 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1368 | case -NFS4ERR_BADSESSION: |
1369 | case -NFS4ERR_BADSLOT: | |
1370 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1371 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1372 | goto out; |
1da177e4 | 1373 | default: |
a030889a WAA |
1374 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1375 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1376 | case -ENOMEM: |
1377 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1378 | case -NFS4ERR_RECLAIM_BAD: |
1379 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1380 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1381 | status = 0; |
1da177e4 | 1382 | } |
b89f4321 | 1383 | lock_flocks(); |
1da177e4 | 1384 | } |
b89f4321 | 1385 | unlock_flocks(); |
965b5d67 | 1386 | out: |
19e03c57 | 1387 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1388 | return status; |
1389 | } | |
1390 | ||
02860014 | 1391 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1392 | { |
1393 | struct nfs4_state *state; | |
1394 | struct nfs4_lock_state *lock; | |
1395 | int status = 0; | |
1396 | ||
1397 | /* Note: we rely on the sp->so_states list being ordered | |
1398 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1399 | * states first. | |
1400 | * This is needed to ensure that the server won't give us any | |
1401 | * read delegations that we have to return if, say, we are | |
1402 | * recovering after a network partition or a reboot from a | |
1403 | * server that doesn't support a grace period. | |
1404 | */ | |
fe1d8195 | 1405 | spin_lock(&sp->so_lock); |
c137afab TM |
1406 | write_seqcount_begin(&sp->so_reclaim_seqcount); |
1407 | restart: | |
1da177e4 | 1408 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1409 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1410 | continue; | |
5d422301 TM |
1411 | if (!nfs4_valid_open_stateid(state)) |
1412 | continue; | |
1da177e4 LT |
1413 | if (state->state == 0) |
1414 | continue; | |
fe1d8195 TM |
1415 | atomic_inc(&state->count); |
1416 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1417 | status = ops->recover_open(sp, state); |
1da177e4 | 1418 | if (status >= 0) { |
02860014 TM |
1419 | status = nfs4_reclaim_locks(state, ops); |
1420 | if (status >= 0) { | |
4b44b40e | 1421 | spin_lock(&state->state_lock); |
02860014 | 1422 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
795a88c9 | 1423 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
96dcadc2 WD |
1424 | pr_warn_ratelimited("NFS: " |
1425 | "%s: Lock reclaim " | |
a030889a | 1426 | "failed!\n", __func__); |
02860014 | 1427 | } |
4b44b40e | 1428 | spin_unlock(&state->state_lock); |
fe1d8195 | 1429 | nfs4_put_open_state(state); |
c137afab | 1430 | spin_lock(&sp->so_lock); |
fe1d8195 | 1431 | goto restart; |
1da177e4 | 1432 | } |
1da177e4 LT |
1433 | } |
1434 | switch (status) { | |
1435 | default: | |
a030889a WAA |
1436 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1437 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1438 | case -ENOENT: |
965b5d67 | 1439 | case -ENOMEM: |
b79a4a1b | 1440 | case -ESTALE: |
1da177e4 LT |
1441 | /* |
1442 | * Open state on this file cannot be recovered | |
1443 | * All we can do is revert to using the zero stateid. | |
1444 | */ | |
5d422301 | 1445 | nfs4_state_mark_recovery_failed(state, status); |
1da177e4 | 1446 | break; |
965b5d67 TM |
1447 | case -NFS4ERR_ADMIN_REVOKED: |
1448 | case -NFS4ERR_STALE_STATEID: | |
1449 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1450 | case -NFS4ERR_RECLAIM_BAD: |
1451 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1452 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1453 | break; |
1da177e4 LT |
1454 | case -NFS4ERR_EXPIRED: |
1455 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1456 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1457 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1458 | case -NFS4ERR_BADSESSION: |
1459 | case -NFS4ERR_BADSLOT: | |
1460 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1461 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1462 | goto out_err; |
1463 | } | |
fe1d8195 | 1464 | nfs4_put_open_state(state); |
c137afab | 1465 | spin_lock(&sp->so_lock); |
fe1d8195 | 1466 | goto restart; |
1da177e4 | 1467 | } |
c137afab | 1468 | write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1469 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1470 | return 0; |
1471 | out_err: | |
fe1d8195 | 1472 | nfs4_put_open_state(state); |
c137afab TM |
1473 | spin_lock(&sp->so_lock); |
1474 | write_seqcount_end(&sp->so_reclaim_seqcount); | |
1475 | spin_unlock(&sp->so_lock); | |
1da177e4 LT |
1476 | return status; |
1477 | } | |
1478 | ||
b79a4a1b TM |
1479 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1480 | { | |
1481 | struct nfs4_lock_state *lock; | |
1482 | ||
1483 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1484 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1485 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1486 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1487 | spin_lock(&state->state_lock); |
b79a4a1b | 1488 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1489 | lock->ls_seqid.flags = 0; |
795a88c9 | 1490 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1491 | } |
4b44b40e | 1492 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1493 | } |
1494 | ||
24d292b8 CL |
1495 | static void nfs4_reset_seqids(struct nfs_server *server, |
1496 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1497 | { |
24d292b8 | 1498 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1499 | struct nfs4_state_owner *sp; |
9f958ab8 | 1500 | struct rb_node *pos; |
cee54fc9 | 1501 | struct nfs4_state *state; |
cee54fc9 | 1502 | |
24d292b8 CL |
1503 | spin_lock(&clp->cl_lock); |
1504 | for (pos = rb_first(&server->state_owners); | |
1505 | pos != NULL; | |
1506 | pos = rb_next(pos)) { | |
1507 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1508 | sp->so_seqid.flags = 0; |
ec073428 | 1509 | spin_lock(&sp->so_lock); |
cee54fc9 | 1510 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1511 | if (mark_reclaim(clp, state)) |
1512 | nfs4_clear_open_state(state); | |
cee54fc9 | 1513 | } |
ec073428 | 1514 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1515 | } |
24d292b8 CL |
1516 | spin_unlock(&clp->cl_lock); |
1517 | } | |
1518 | ||
1519 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1520 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1521 | { | |
1522 | struct nfs_server *server; | |
1523 | ||
1524 | rcu_read_lock(); | |
1525 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1526 | nfs4_reset_seqids(server, mark_reclaim); | |
1527 | rcu_read_unlock(); | |
cee54fc9 TM |
1528 | } |
1529 | ||
b79a4a1b TM |
1530 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1531 | { | |
1532 | /* Mark all delegations for reclaim */ | |
1533 | nfs_delegation_mark_reclaim(clp); | |
1534 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1535 | } | |
1536 | ||
fce5c838 RL |
1537 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
1538 | const struct nfs4_state_recovery_ops *ops) | |
1539 | { | |
1540 | /* Notify the server we're done reclaiming our state */ | |
1541 | if (ops->reclaim_complete) | |
1542 | (void)ops->reclaim_complete(clp); | |
1543 | } | |
1544 | ||
24d292b8 | 1545 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1546 | { |
24d292b8 | 1547 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1548 | struct nfs4_state_owner *sp; |
1549 | struct rb_node *pos; | |
1550 | struct nfs4_state *state; | |
1551 | ||
24d292b8 CL |
1552 | spin_lock(&clp->cl_lock); |
1553 | for (pos = rb_first(&server->state_owners); | |
1554 | pos != NULL; | |
1555 | pos = rb_next(pos)) { | |
1556 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1557 | spin_lock(&sp->so_lock); |
1558 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1559 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1560 | &state->flags)) | |
b79a4a1b TM |
1561 | continue; |
1562 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1563 | } | |
1564 | spin_unlock(&sp->so_lock); | |
1565 | } | |
24d292b8 CL |
1566 | spin_unlock(&clp->cl_lock); |
1567 | } | |
1568 | ||
1569 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1570 | { | |
1571 | struct nfs_server *server; | |
1572 | ||
1573 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1574 | return 0; | |
1575 | ||
1576 | rcu_read_lock(); | |
1577 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1578 | nfs4_clear_reclaim_server(server); | |
1579 | rcu_read_unlock(); | |
b79a4a1b TM |
1580 | |
1581 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1582 | return 1; |
1583 | } | |
1584 | ||
1585 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1586 | { | |
1587 | if (!nfs4_state_clear_reclaim_reboot(clp)) | |
1588 | return; | |
1589 | nfs4_reclaim_complete(clp, clp->cl_mvops->reboot_recovery_ops); | |
b79a4a1b TM |
1590 | } |
1591 | ||
1592 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1593 | { | |
1594 | nfs_delegation_mark_reclaim(clp); | |
1595 | nfs_delegation_reap_unclaimed(clp); | |
1596 | } | |
1597 | ||
1598 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1599 | { | |
1600 | nfs_delegation_clear_all(clp); | |
1601 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1602 | } | |
1603 | ||
4f7cdf18 | 1604 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1605 | { |
1606 | switch (error) { | |
4f38e4aa TM |
1607 | case 0: |
1608 | break; | |
e598d843 | 1609 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1610 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1611 | break; |
c8b7ae3d TM |
1612 | case -NFS4ERR_NO_GRACE: |
1613 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1614 | break; |
e598d843 TM |
1615 | case -NFS4ERR_STALE_CLIENTID: |
1616 | case -NFS4ERR_LEASE_MOVED: | |
1617 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1618 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1619 | nfs4_state_start_reclaim_reboot(clp); |
1620 | break; | |
1621 | case -NFS4ERR_EXPIRED: | |
1622 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1623 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1624 | break; |
c3fad1b1 AA |
1625 | case -NFS4ERR_BADSESSION: |
1626 | case -NFS4ERR_BADSLOT: | |
1627 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1628 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1629 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1630 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1631 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1632 | /* Zero session reset errors */ |
4f38e4aa | 1633 | break; |
7c5d7256 TM |
1634 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1635 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1636 | break; | |
4f38e4aa | 1637 | default: |
cc0a9843 TM |
1638 | dprintk("%s: failed to handle error %d for server %s\n", |
1639 | __func__, error, clp->cl_hostname); | |
4f38e4aa | 1640 | return error; |
e598d843 | 1641 | } |
cc0a9843 TM |
1642 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1643 | clp->cl_hostname); | |
4f38e4aa | 1644 | return 0; |
e598d843 TM |
1645 | } |
1646 | ||
02860014 | 1647 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1648 | { |
24d292b8 CL |
1649 | struct nfs4_state_owner *sp; |
1650 | struct nfs_server *server; | |
9f958ab8 | 1651 | struct rb_node *pos; |
1da177e4 LT |
1652 | int status = 0; |
1653 | ||
7eff03ae | 1654 | restart: |
24d292b8 CL |
1655 | rcu_read_lock(); |
1656 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1657 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1658 | spin_lock(&clp->cl_lock); |
1659 | for (pos = rb_first(&server->state_owners); | |
1660 | pos != NULL; | |
1661 | pos = rb_next(pos)) { | |
1662 | sp = rb_entry(pos, | |
1663 | struct nfs4_state_owner, so_server_node); | |
1664 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1665 | &sp->so_flags)) | |
1666 | continue; | |
1667 | atomic_inc(&sp->so_count); | |
1668 | spin_unlock(&clp->cl_lock); | |
1669 | rcu_read_unlock(); | |
1670 | ||
1671 | status = nfs4_reclaim_open_state(sp, ops); | |
1672 | if (status < 0) { | |
1673 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1674 | nfs4_put_state_owner(sp); | |
1675 | return nfs4_recovery_handle_error(clp, status); | |
1676 | } | |
1677 | ||
7eff03ae | 1678 | nfs4_put_state_owner(sp); |
24d292b8 | 1679 | goto restart; |
7eff03ae | 1680 | } |
24d292b8 | 1681 | spin_unlock(&clp->cl_lock); |
02860014 | 1682 | } |
24d292b8 | 1683 | rcu_read_unlock(); |
02860014 TM |
1684 | return status; |
1685 | } | |
1686 | ||
1687 | static int nfs4_check_lease(struct nfs_client *clp) | |
1688 | { | |
1689 | struct rpc_cred *cred; | |
c48f4f35 TM |
1690 | const struct nfs4_state_maintenance_ops *ops = |
1691 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1692 | int status; |
1da177e4 | 1693 | |
0f605b56 TM |
1694 | /* Is the client already known to have an expired lease? */ |
1695 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1696 | return 0; | |
a7b72103 AA |
1697 | spin_lock(&clp->cl_lock); |
1698 | cred = ops->get_state_renewal_cred_locked(clp); | |
1699 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1700 | if (cred == NULL) { |
1701 | cred = nfs4_get_setclientid_cred(clp); | |
4f38e4aa | 1702 | status = -ENOKEY; |
0f605b56 TM |
1703 | if (cred == NULL) |
1704 | goto out; | |
286d7d6a | 1705 | } |
8e69514f | 1706 | status = ops->renew_lease(clp, cred); |
0f605b56 TM |
1707 | put_rpccred(cred); |
1708 | out: | |
4f7cdf18 | 1709 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1710 | } |
1711 | ||
47b803c8 AA |
1712 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1713 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1714 | */ |
1715 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1716 | { | |
1717 | switch (status) { | |
89a21736 TM |
1718 | case -NFS4ERR_SEQ_MISORDERED: |
1719 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1720 | return -ESERVERFAULT; | |
1721 | /* Lease confirmation error: retry after purging the lease */ | |
1722 | ssleep(1); | |
47b803c8 AA |
1723 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1724 | break; | |
2a6ee6aa TM |
1725 | case -NFS4ERR_STALE_CLIENTID: |
1726 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 AA |
1727 | nfs4_state_clear_reclaim_reboot(clp); |
1728 | nfs4_state_start_reclaim_reboot(clp); | |
2a6ee6aa | 1729 | break; |
de734831 CL |
1730 | case -NFS4ERR_CLID_INUSE: |
1731 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1732 | clp->cl_hostname); | |
1733 | nfs_mark_client_ready(clp, -EPERM); | |
1734 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1735 | return -EPERM; | |
2a6ee6aa TM |
1736 | case -EACCES: |
1737 | if (clp->cl_machine_cred == NULL) | |
1738 | return -EACCES; | |
1739 | /* Handle case where the user hasn't set up machine creds */ | |
1740 | nfs4_clear_machine_cred(clp); | |
1741 | case -NFS4ERR_DELAY: | |
1742 | case -ETIMEDOUT: | |
1743 | case -EAGAIN: | |
1744 | ssleep(1); | |
1745 | break; | |
1746 | ||
1747 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1748 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1749 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1750 | dprintk("%s: exit with error %d for server %s\n", |
1751 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1752 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1753 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1754 | * in nfs4_exchange_id */ | |
1755 | default: | |
cc0a9843 TM |
1756 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1757 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1758 | return status; |
1759 | } | |
1760 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1761 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1762 | clp->cl_hostname); | |
2a6ee6aa TM |
1763 | return 0; |
1764 | } | |
1765 | ||
b42353ff | 1766 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 TM |
1767 | { |
1768 | struct rpc_cred *cred; | |
c48f4f35 TM |
1769 | const struct nfs4_state_recovery_ops *ops = |
1770 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1771 | int status; |
02860014 | 1772 | |
90a16617 | 1773 | cred = ops->get_clid_cred(clp); |
2a6ee6aa TM |
1774 | if (cred == NULL) |
1775 | return -ENOENT; | |
1776 | status = ops->establish_clid(clp, cred); | |
1777 | put_rpccred(cred); | |
1778 | if (status != 0) | |
b42353ff TM |
1779 | return status; |
1780 | pnfs_destroy_all_layouts(clp); | |
1781 | return 0; | |
1782 | } | |
1783 | ||
6bbb4ae8 CL |
1784 | /* |
1785 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1786 | * to local errno values. | |
1787 | */ | |
b42353ff TM |
1788 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1789 | { | |
1790 | int status; | |
1791 | ||
1792 | status = nfs4_establish_lease(clp); | |
1793 | if (status < 0) | |
1794 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1795 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
1796 | nfs4_state_start_reclaim_nograce(clp); | |
1797 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1798 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1799 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1800 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1801 | return 0; | |
1802 | } | |
1803 | ||
1804 | static int nfs4_purge_lease(struct nfs_client *clp) | |
1805 | { | |
1806 | int status; | |
1807 | ||
1808 | status = nfs4_establish_lease(clp); | |
1809 | if (status < 0) | |
2a6ee6aa | 1810 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
1811 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1812 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1813 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 1814 | return 0; |
02860014 TM |
1815 | } |
1816 | ||
05f4c350 CL |
1817 | /** |
1818 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
1819 | * | |
1820 | * @clp: nfs_client under test | |
1821 | * @result: OUT: found nfs_client, or clp | |
1822 | * | |
1823 | * Returns zero or a negative errno. If zero is returned, | |
1824 | * an nfs_client pointer is planted in "result". | |
1825 | * | |
1826 | * Note: since we are invoked in process context, and | |
1827 | * not from inside the state manager, we cannot use | |
1828 | * nfs4_handle_reclaim_lease_error(). | |
1829 | */ | |
1830 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
1831 | struct nfs_client **result) | |
1832 | { | |
1833 | const struct nfs4_state_recovery_ops *ops = | |
1834 | clp->cl_mvops->reboot_recovery_ops; | |
1835 | rpc_authflavor_t *flavors, flav, save; | |
1836 | struct rpc_clnt *clnt; | |
1837 | struct rpc_cred *cred; | |
1838 | int i, len, status; | |
1839 | ||
1840 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
1841 | ||
1842 | len = NFS_MAX_SECFLAVORS; | |
1843 | flavors = kcalloc(len, sizeof(*flavors), GFP_KERNEL); | |
1844 | if (flavors == NULL) { | |
1845 | status = -ENOMEM; | |
1846 | goto out; | |
1847 | } | |
1848 | len = rpcauth_list_flavors(flavors, len); | |
1849 | if (len < 0) { | |
1850 | status = len; | |
1851 | goto out_free; | |
1852 | } | |
1853 | clnt = clp->cl_rpcclient; | |
1854 | save = clnt->cl_auth->au_flavor; | |
1855 | i = 0; | |
1856 | ||
1857 | mutex_lock(&nfs_clid_init_mutex); | |
1858 | status = -ENOENT; | |
1859 | again: | |
1860 | cred = ops->get_clid_cred(clp); | |
1861 | if (cred == NULL) | |
1862 | goto out_unlock; | |
1863 | ||
1864 | status = ops->detect_trunking(clp, result, cred); | |
1865 | put_rpccred(cred); | |
1866 | switch (status) { | |
1867 | case 0: | |
1868 | break; | |
1869 | ||
1870 | case -EACCES: | |
1871 | if (clp->cl_machine_cred == NULL) | |
1872 | break; | |
1873 | /* Handle case where the user hasn't set up machine creds */ | |
1874 | nfs4_clear_machine_cred(clp); | |
1875 | case -NFS4ERR_DELAY: | |
1876 | case -ETIMEDOUT: | |
1877 | case -EAGAIN: | |
1878 | ssleep(1); | |
202c312d | 1879 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
1880 | dprintk("NFS: %s after status %d, retrying\n", |
1881 | __func__, status); | |
1882 | goto again; | |
1883 | ||
1884 | case -NFS4ERR_CLID_INUSE: | |
1885 | case -NFS4ERR_WRONGSEC: | |
1886 | status = -EPERM; | |
1887 | if (i >= len) | |
1888 | break; | |
1889 | ||
1890 | flav = flavors[i++]; | |
1891 | if (flav == save) | |
1892 | flav = flavors[i++]; | |
1893 | clnt = rpc_clone_client_set_auth(clnt, flav); | |
1894 | if (IS_ERR(clnt)) { | |
1895 | status = PTR_ERR(clnt); | |
1896 | break; | |
1897 | } | |
1898 | clp->cl_rpcclient = clnt; | |
1899 | goto again; | |
1900 | ||
1901 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1902 | status = -EPROTONOSUPPORT; | |
1903 | break; | |
1904 | ||
1905 | case -EKEYEXPIRED: | |
05f4c350 CL |
1906 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1907 | * in nfs4_exchange_id */ | |
1908 | status = -EKEYEXPIRED; | |
1909 | } | |
1910 | ||
1911 | out_unlock: | |
1912 | mutex_unlock(&nfs_clid_init_mutex); | |
1913 | out_free: | |
1914 | kfree(flavors); | |
1915 | out: | |
1916 | dprintk("NFS: %s: status = %d\n", __func__, status); | |
1917 | return status; | |
1918 | } | |
1919 | ||
76db6d95 | 1920 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1921 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1922 | { |
444f72fe TM |
1923 | struct nfs_client *clp = session->clp; |
1924 | ||
9f594791 TM |
1925 | switch (err) { |
1926 | default: | |
1927 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1928 | break; | |
1929 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1930 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1931 | } | |
444f72fe | 1932 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1933 | } |
cbdabc7f | 1934 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1935 | |
ac074835 TM |
1936 | static void nfs41_ping_server(struct nfs_client *clp) |
1937 | { | |
1938 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
1939 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1940 | nfs4_schedule_state_manager(clp); | |
1941 | } | |
1942 | ||
1943 | void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) | |
1944 | { | |
1945 | nfs41_ping_server(clp); | |
1946 | } | |
1947 | ||
c10e4498 TM |
1948 | void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
1949 | { | |
1950 | nfs41_ping_server(clp); | |
1951 | } | |
1952 | ||
0f79fd6f TM |
1953 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1954 | { | |
1955 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1956 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1957 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1958 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
1959 | dprintk("%s: scheduling reset of all state for server %s!\n", |
1960 | __func__, clp->cl_hostname); | |
0400a6b0 | 1961 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1962 | } |
1963 | } | |
1964 | ||
1965 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1966 | { | |
1967 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1968 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
1969 | dprintk("%s: server %s rebooted!\n", __func__, |
1970 | clp->cl_hostname); | |
0400a6b0 | 1971 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1972 | } |
1973 | } | |
1974 | ||
1975 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1976 | { | |
0f79fd6f | 1977 | nfs4_reset_all_state(clp); |
cc0a9843 | 1978 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
1979 | } |
1980 | ||
1981 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1982 | { | |
1983 | /* This will need to handle layouts too */ | |
1984 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1985 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
1986 | clp->cl_hostname); | |
0f79fd6f TM |
1987 | } |
1988 | ||
a9e64442 | 1989 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
1990 | { |
1991 | nfs_expire_all_delegations(clp); | |
1992 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1993 | nfs4_schedule_state_manager(clp); |
cc0a9843 TM |
1994 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
1995 | clp->cl_hostname); | |
0f79fd6f TM |
1996 | } |
1997 | ||
a9e64442 WAA |
1998 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
1999 | { | |
2000 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
2001 | &clp->cl_state) == 0) | |
2002 | nfs4_schedule_state_manager(clp); | |
2003 | } | |
2004 | ||
0629e370 AB |
2005 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
2006 | { | |
2007 | if (!flags) | |
2008 | return; | |
2c820d9a CL |
2009 | |
2010 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2011 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
2012 | ||
111d489f | 2013 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2014 | nfs41_handle_server_reboot(clp); |
111d489f | 2015 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
2016 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
2017 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
2018 | SEQ4_STATUS_LEASE_MOVED)) |
2019 | nfs41_handle_state_revoked(clp); | |
111d489f | 2020 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2021 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
2022 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2023 | nfs41_handle_backchannel_fault(clp); | |
2024 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2025 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2026 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2027 | } |
2028 | ||
c3fad1b1 AA |
2029 | static int nfs4_reset_session(struct nfs_client *clp) |
2030 | { | |
848f5bda | 2031 | struct rpc_cred *cred; |
c3fad1b1 AA |
2032 | int status; |
2033 | ||
1a47e7a6 TM |
2034 | if (!nfs4_has_session(clp)) |
2035 | return 0; | |
38045412 | 2036 | nfs4_begin_drain_session(clp); |
848f5bda TM |
2037 | cred = nfs4_get_exchange_id_cred(clp); |
2038 | status = nfs4_proc_destroy_session(clp->cl_session, cred); | |
c489ee29 TM |
2039 | switch (status) { |
2040 | case 0: | |
2041 | case -NFS4ERR_BADSESSION: | |
2042 | case -NFS4ERR_DEADSESSION: | |
2043 | break; | |
2044 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2045 | case -NFS4ERR_DELAY: | |
2046 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2047 | status = 0; | |
2048 | ssleep(1); | |
2049 | goto out; | |
2050 | default: | |
f455848a | 2051 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2052 | goto out; |
2053 | } | |
2054 | ||
2055 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2056 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2057 | if (status) { |
cc0a9843 TM |
2058 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2059 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2060 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2061 | goto out; |
2062 | } | |
bda197f5 | 2063 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2064 | dprintk("%s: session reset was successful for server %s!\n", |
2065 | __func__, clp->cl_hostname); | |
41f54a55 | 2066 | out: |
848f5bda TM |
2067 | if (cred) |
2068 | put_rpccred(cred); | |
c3fad1b1 AA |
2069 | return status; |
2070 | } | |
76db6d95 | 2071 | |
a9e64442 WAA |
2072 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2073 | { | |
2cf047c9 TM |
2074 | struct rpc_cred *cred; |
2075 | int ret; | |
2076 | ||
1a47e7a6 TM |
2077 | if (!nfs4_has_session(clp)) |
2078 | return 0; | |
43ac544c | 2079 | nfs4_begin_drain_session(clp); |
2cf047c9 TM |
2080 | cred = nfs4_get_exchange_id_cred(clp); |
2081 | ret = nfs4_proc_bind_conn_to_session(clp, cred); | |
2082 | if (cred) | |
2083 | put_rpccred(cred); | |
43ac544c | 2084 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2085 | switch (ret) { |
2086 | case 0: | |
cc0a9843 TM |
2087 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2088 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2089 | break; |
2090 | case -NFS4ERR_DELAY: | |
2091 | ssleep(1); | |
2092 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2093 | break; | |
2094 | default: | |
2095 | return nfs4_recovery_handle_error(clp, ret); | |
2096 | } | |
2097 | return 0; | |
a9e64442 | 2098 | } |
76db6d95 | 2099 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2100 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 2101 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
2102 | |
2103 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2104 | { | |
2105 | return 0; | |
2106 | } | |
76db6d95 AA |
2107 | #endif /* CONFIG_NFS_V4_1 */ |
2108 | ||
e005e804 | 2109 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2110 | { |
02860014 | 2111 | int status = 0; |
8ed27d4f | 2112 | const char *section = "", *section_sep = ""; |
02860014 | 2113 | |
02860014 | 2114 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2115 | do { |
2c820d9a | 2116 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2117 | section = "purge state"; |
b42353ff | 2118 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2119 | if (status < 0) |
2120 | goto out_error; | |
b42353ff | 2121 | continue; |
2c820d9a CL |
2122 | } |
2123 | ||
b42353ff | 2124 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2125 | section = "lease expired"; |
b79a4a1b TM |
2126 | /* We're going to have to re-establish a clientid */ |
2127 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2128 | if (status < 0) |
b79a4a1b | 2129 | goto out_error; |
b42353ff | 2130 | continue; |
e598d843 TM |
2131 | } |
2132 | ||
c3fad1b1 | 2133 | /* Initialize or reset the session */ |
1a47e7a6 | 2134 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2135 | section = "reset session"; |
4d643d1d | 2136 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2137 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2138 | continue; | |
2139 | if (status < 0) | |
76db6d95 | 2140 | goto out_error; |
76db6d95 | 2141 | } |
b6d408ba | 2142 | |
a9e64442 WAA |
2143 | /* Send BIND_CONN_TO_SESSION */ |
2144 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2145 | &clp->cl_state)) { |
8ed27d4f | 2146 | section = "bind conn to session"; |
a9e64442 WAA |
2147 | status = nfs4_bind_conn_to_session(clp); |
2148 | if (status < 0) | |
2149 | goto out_error; | |
bf674c82 | 2150 | continue; |
a9e64442 WAA |
2151 | } |
2152 | ||
5df904ae TM |
2153 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2154 | section = "check lease"; | |
2155 | status = nfs4_check_lease(clp); | |
2156 | if (status < 0) | |
2157 | goto out_error; | |
2158 | continue; | |
2159 | } | |
2160 | ||
b79a4a1b | 2161 | /* First recover reboot state... */ |
e345e88a | 2162 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2163 | section = "reclaim reboot"; |
591d71cb | 2164 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2165 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 2166 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2167 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 2168 | continue; |
b79a4a1b | 2169 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
2170 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
2171 | continue; | |
2172 | if (status < 0) | |
2173 | goto out_error; | |
02860014 TM |
2174 | } |
2175 | ||
b79a4a1b TM |
2176 | /* Now recover expired state... */ |
2177 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2178 | section = "reclaim nograce"; |
591d71cb | 2179 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2180 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 2181 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2182 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
2183 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
2184 | continue; | |
2185 | if (status < 0) | |
b79a4a1b | 2186 | goto out_error; |
1da177e4 | 2187 | } |
707fb4b3 | 2188 | |
5601a00d | 2189 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
2190 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
2191 | nfs_client_return_marked_delegations(clp); | |
2192 | continue; | |
2193 | } | |
e005e804 TM |
2194 | |
2195 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
2196 | /* Did we race with an attempt to give us more work? */ |
2197 | if (clp->cl_state == 0) | |
2198 | break; | |
2199 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
2200 | break; | |
47c2199b | 2201 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 2202 | return; |
1da177e4 | 2203 | out_error: |
8ed27d4f WAA |
2204 | if (strlen(section)) |
2205 | section_sep = ": "; | |
2206 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2207 | " with error %d\n", section_sep, section, | |
2208 | clp->cl_hostname, -status); | |
ffe5a830 | 2209 | ssleep(1); |
5601a00d | 2210 | nfs4_end_drain_session(clp); |
e005e804 TM |
2211 | nfs4_clear_state_manager_bit(clp); |
2212 | } | |
2213 | ||
2214 | static int nfs4_run_state_manager(void *ptr) | |
2215 | { | |
2216 | struct nfs_client *clp = ptr; | |
2217 | ||
2218 | allow_signal(SIGKILL); | |
2219 | nfs4_state_manager(clp); | |
2220 | nfs_put_client(clp); | |
2221 | module_put_and_exit(0); | |
2222 | return 0; | |
1da177e4 LT |
2223 | } |
2224 | ||
2225 | /* | |
2226 | * Local variables: | |
2227 | * c-basic-offset: 8 | |
2228 | * End: | |
2229 | */ |