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 | ||
24d292b8 CL |
157 | static struct rpc_cred * |
158 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 159 | { |
24d292b8 | 160 | struct rpc_cred *cred = NULL; |
b4454fe1 | 161 | struct nfs4_state_owner *sp; |
9f958ab8 | 162 | struct rb_node *pos; |
b4454fe1 | 163 | |
24d292b8 CL |
164 | for (pos = rb_first(&server->state_owners); |
165 | pos != NULL; | |
166 | pos = rb_next(pos)) { | |
167 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
168 | if (list_empty(&sp->so_states)) |
169 | continue; | |
170 | cred = get_rpccred(sp->so_cred); | |
171 | break; | |
172 | } | |
173 | return cred; | |
174 | } | |
175 | ||
24d292b8 CL |
176 | /** |
177 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
178 | * @clp: client state handle | |
179 | * | |
180 | * Returns an rpc_cred with reference count bumped, or NULL. | |
181 | * Caller must hold clp->cl_lock. | |
182 | */ | |
183 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
184 | { | |
185 | struct rpc_cred *cred = NULL; | |
186 | struct nfs_server *server; | |
187 | ||
e49a29bd SP |
188 | /* Use machine credentials if available */ |
189 | cred = nfs4_get_machine_cred_locked(clp); | |
190 | if (cred != NULL) | |
191 | goto out; | |
192 | ||
24d292b8 CL |
193 | rcu_read_lock(); |
194 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
195 | cred = nfs4_get_renew_cred_server_locked(server); | |
196 | if (cred != NULL) | |
197 | break; | |
198 | } | |
199 | rcu_read_unlock(); | |
e49a29bd SP |
200 | |
201 | out: | |
24d292b8 CL |
202 | return cred; |
203 | } | |
204 | ||
b4b82607 AA |
205 | #if defined(CONFIG_NFS_V4_1) |
206 | ||
9430fb6b RL |
207 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
208 | { | |
209 | int status; | |
210 | struct nfs_fsinfo fsinfo; | |
211 | ||
d6fb79d4 AA |
212 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
213 | nfs4_schedule_state_renewal(clp); | |
214 | return 0; | |
215 | } | |
216 | ||
9430fb6b RL |
217 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
218 | if (status == 0) { | |
219 | /* Update lease time and schedule renewal */ | |
220 | spin_lock(&clp->cl_lock); | |
221 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
222 | clp->cl_last_renewal = jiffies; | |
223 | spin_unlock(&clp->cl_lock); | |
224 | ||
225 | nfs4_schedule_state_renewal(clp); | |
226 | } | |
227 | ||
228 | return status; | |
229 | } | |
230 | ||
42acd021 AA |
231 | /* |
232 | * Back channel returns NFS4ERR_DELAY for new requests when | |
233 | * NFS4_SESSION_DRAINING is set so there is no work to be done when draining | |
234 | * is ended. | |
235 | */ | |
5601a00d | 236 | static void nfs4_end_drain_session(struct nfs_client *clp) |
9dfdf404 | 237 | { |
5601a00d | 238 | struct nfs4_session *ses = clp->cl_session; |
961a828d | 239 | struct nfs4_slot_table *tbl; |
689cf5c1 | 240 | |
a2118c33 TM |
241 | if (ses == NULL) |
242 | return; | |
961a828d | 243 | tbl = &ses->fc_slot_table; |
774d5f14 | 244 | if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
961a828d | 245 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 246 | nfs41_wake_slot_table(tbl); |
961a828d | 247 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 248 | } |
9dfdf404 RL |
249 | } |
250 | ||
5d63360d TM |
251 | /* |
252 | * Signal state manager thread if session fore channel is drained | |
253 | */ | |
774d5f14 | 254 | void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl) |
5d63360d | 255 | { |
774d5f14 | 256 | if (nfs4_slot_tbl_draining(tbl)) |
5d63360d TM |
257 | complete(&tbl->complete); |
258 | } | |
259 | ||
774d5f14 | 260 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 261 | { |
774d5f14 | 262 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 263 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 264 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 265 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 266 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 267 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
268 | } |
269 | spin_unlock(&tbl->slot_tbl_lock); | |
270 | return 0; | |
271 | } | |
272 | ||
42acd021 AA |
273 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
274 | { | |
275 | struct nfs4_session *ses = clp->cl_session; | |
276 | int ret = 0; | |
277 | ||
42acd021 | 278 | /* back channel */ |
774d5f14 | 279 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
280 | if (ret) |
281 | return ret; | |
282 | /* fore channel */ | |
774d5f14 | 283 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
284 | } |
285 | ||
bda197f5 TM |
286 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
287 | { | |
288 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
289 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
290 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
291 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
292 | nfs41_setup_state_renewal(clp); | |
293 | } | |
294 | ||
4d643d1d AA |
295 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
296 | { | |
297 | int status; | |
298 | ||
fd954ae1 TM |
299 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
300 | goto do_confirm; | |
38045412 | 301 | nfs4_begin_drain_session(clp); |
4d643d1d | 302 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
303 | if (status != 0) |
304 | goto out; | |
fd954ae1 TM |
305 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
306 | do_confirm: | |
848f5bda | 307 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
308 | if (status != 0) |
309 | goto out; | |
bda197f5 | 310 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
311 | nfs_mark_client_ready(clp, NFS_CS_READY); |
312 | out: | |
4d643d1d AA |
313 | return status; |
314 | } | |
315 | ||
05f4c350 CL |
316 | /** |
317 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
318 | * | |
319 | * @clp: nfs_client under test | |
320 | * @result: OUT: found nfs_client, or clp | |
321 | * @cred: credential to use for trunking test | |
322 | * | |
323 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
324 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
325 | * "result". | |
326 | * | |
327 | * Note: The returned client may not yet be marked ready. | |
328 | */ | |
329 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
330 | struct nfs_client **result, | |
331 | struct rpc_cred *cred) | |
332 | { | |
333 | int status; | |
334 | ||
335 | status = nfs4_proc_exchange_id(clp, cred); | |
336 | if (status != NFS4_OK) | |
337 | return status; | |
fd483570 | 338 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
05f4c350 CL |
339 | |
340 | return nfs41_walk_client_list(clp, result, cred); | |
341 | } | |
342 | ||
b4b82607 AA |
343 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
344 | { | |
345 | struct rpc_cred *cred; | |
346 | ||
347 | spin_lock(&clp->cl_lock); | |
348 | cred = nfs4_get_machine_cred_locked(clp); | |
349 | spin_unlock(&clp->cl_lock); | |
350 | return cred; | |
351 | } | |
352 | ||
353 | #endif /* CONFIG_NFS_V4_1 */ | |
354 | ||
24d292b8 CL |
355 | static struct rpc_cred * |
356 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 357 | { |
24d292b8 CL |
358 | struct nfs_client *clp = server->nfs_client; |
359 | struct rpc_cred *cred = NULL; | |
286d7d6a | 360 | struct nfs4_state_owner *sp; |
9f958ab8 | 361 | struct rb_node *pos; |
24d292b8 CL |
362 | |
363 | spin_lock(&clp->cl_lock); | |
364 | pos = rb_first(&server->state_owners); | |
365 | if (pos != NULL) { | |
366 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
367 | cred = get_rpccred(sp->so_cred); | |
368 | } | |
369 | spin_unlock(&clp->cl_lock); | |
370 | return cred; | |
371 | } | |
372 | ||
373 | /** | |
374 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
375 | * @clp: client state handle | |
376 | * | |
377 | * Returns an rpc_cred with reference count bumped, or NULL. | |
378 | */ | |
379 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
380 | { | |
381 | struct nfs_server *server; | |
a2b2bb88 | 382 | struct rpc_cred *cred; |
286d7d6a | 383 | |
6dc9d57a TM |
384 | spin_lock(&clp->cl_lock); |
385 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 386 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
387 | if (cred != NULL) |
388 | goto out; | |
24d292b8 CL |
389 | |
390 | rcu_read_lock(); | |
391 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
392 | cred = nfs4_get_setclientid_cred_server(server); | |
393 | if (cred != NULL) | |
394 | break; | |
286d7d6a | 395 | } |
24d292b8 CL |
396 | rcu_read_unlock(); |
397 | ||
a2b2bb88 TM |
398 | out: |
399 | return cred; | |
286d7d6a TM |
400 | } |
401 | ||
1da177e4 | 402 | static struct nfs4_state_owner * |
24d292b8 | 403 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 404 | { |
24d292b8 | 405 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 406 | *parent = NULL; |
414adf14 | 407 | struct nfs4_state_owner *sp; |
1da177e4 | 408 | |
9f958ab8 TM |
409 | while (*p != NULL) { |
410 | parent = *p; | |
24d292b8 | 411 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
412 | |
413 | if (cred < sp->so_cred) | |
414 | p = &parent->rb_left; | |
415 | else if (cred > sp->so_cred) | |
416 | p = &parent->rb_right; | |
417 | else { | |
0aaaf5c4 CL |
418 | if (!list_empty(&sp->so_lru)) |
419 | list_del_init(&sp->so_lru); | |
9f958ab8 | 420 | atomic_inc(&sp->so_count); |
414adf14 | 421 | return sp; |
9f958ab8 | 422 | } |
1da177e4 | 423 | } |
414adf14 | 424 | return NULL; |
1da177e4 LT |
425 | } |
426 | ||
9f958ab8 | 427 | static struct nfs4_state_owner * |
24d292b8 | 428 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 429 | { |
24d292b8 CL |
430 | struct nfs_server *server = new->so_server; |
431 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
432 | *parent = NULL; |
433 | struct nfs4_state_owner *sp; | |
9157c31d | 434 | int err; |
9f958ab8 TM |
435 | |
436 | while (*p != NULL) { | |
437 | parent = *p; | |
24d292b8 | 438 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
439 | |
440 | if (new->so_cred < sp->so_cred) | |
441 | p = &parent->rb_left; | |
442 | else if (new->so_cred > sp->so_cred) | |
443 | p = &parent->rb_right; | |
444 | else { | |
0aaaf5c4 CL |
445 | if (!list_empty(&sp->so_lru)) |
446 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
447 | atomic_inc(&sp->so_count); |
448 | return sp; | |
449 | } | |
450 | } | |
48c22eb2 | 451 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
452 | if (err) |
453 | return ERR_PTR(err); | |
24d292b8 CL |
454 | rb_link_node(&new->so_server_node, parent, p); |
455 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
456 | return new; |
457 | } | |
458 | ||
459 | static void | |
24d292b8 | 460 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 461 | { |
24d292b8 CL |
462 | struct nfs_server *server = sp->so_server; |
463 | ||
464 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
465 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 466 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
467 | } |
468 | ||
7ba127ab TM |
469 | static void |
470 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
471 | { | |
95b72eb0 | 472 | sc->create_time = ktime_get(); |
7ba127ab TM |
473 | sc->flags = 0; |
474 | sc->counter = 0; | |
475 | spin_lock_init(&sc->lock); | |
476 | INIT_LIST_HEAD(&sc->list); | |
477 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
478 | } | |
479 | ||
480 | static void | |
481 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
482 | { | |
483 | rpc_destroy_wait_queue(&sc->wait); | |
484 | } | |
485 | ||
1da177e4 LT |
486 | /* |
487 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
488 | * create a new state_owner. | |
489 | * | |
490 | */ | |
491 | static struct nfs4_state_owner * | |
d1e284d5 TM |
492 | nfs4_alloc_state_owner(struct nfs_server *server, |
493 | struct rpc_cred *cred, | |
494 | gfp_t gfp_flags) | |
1da177e4 LT |
495 | { |
496 | struct nfs4_state_owner *sp; | |
497 | ||
d1e284d5 | 498 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
499 | if (!sp) |
500 | return NULL; | |
d1e284d5 TM |
501 | sp->so_server = server; |
502 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 503 | spin_lock_init(&sp->so_lock); |
1da177e4 | 504 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 505 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 506 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 507 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 508 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 509 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
510 | return sp; |
511 | } | |
512 | ||
1d2e88e7 | 513 | static void |
1da177e4 LT |
514 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
515 | { | |
c77365c9 TM |
516 | struct rb_node *rb_node = &sp->so_server_node; |
517 | ||
518 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
519 | struct nfs_server *server = sp->so_server; |
520 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
521 | |
522 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
523 | if (!RB_EMPTY_NODE(rb_node)) { |
524 | rb_erase(rb_node, &server->state_owners); | |
525 | RB_CLEAR_NODE(rb_node); | |
526 | } | |
9f958ab8 TM |
527 | spin_unlock(&clp->cl_lock); |
528 | } | |
1da177e4 LT |
529 | } |
530 | ||
0aaaf5c4 CL |
531 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
532 | { | |
7ba127ab | 533 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
534 | put_rpccred(sp->so_cred); |
535 | kfree(sp); | |
536 | } | |
537 | ||
538 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
539 | { | |
540 | struct nfs_client *clp = server->nfs_client; | |
541 | struct nfs4_state_owner *sp, *tmp; | |
542 | unsigned long time_min, time_max; | |
543 | LIST_HEAD(doomed); | |
544 | ||
545 | spin_lock(&clp->cl_lock); | |
546 | time_max = jiffies; | |
547 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
548 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
549 | /* NB: LRU is sorted so that oldest is at the head */ | |
550 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
551 | break; | |
552 | list_move(&sp->so_lru, &doomed); | |
553 | nfs4_remove_state_owner_locked(sp); | |
554 | } | |
555 | spin_unlock(&clp->cl_lock); | |
556 | ||
557 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
558 | list_del(&sp->so_lru); | |
559 | nfs4_free_state_owner(sp); | |
560 | } | |
561 | } | |
562 | ||
24d292b8 CL |
563 | /** |
564 | * nfs4_get_state_owner - Look up a state owner given a credential | |
565 | * @server: nfs_server to search | |
566 | * @cred: RPC credential to match | |
567 | * | |
568 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
569 | */ | |
570 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
571 | struct rpc_cred *cred, |
572 | gfp_t gfp_flags) | |
1da177e4 | 573 | { |
7539bbab | 574 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
575 | struct nfs4_state_owner *sp, *new; |
576 | ||
1da177e4 | 577 | spin_lock(&clp->cl_lock); |
24d292b8 | 578 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 579 | spin_unlock(&clp->cl_lock); |
1da177e4 | 580 | if (sp != NULL) |
0aaaf5c4 | 581 | goto out; |
d1e284d5 | 582 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 583 | if (new == NULL) |
0aaaf5c4 | 584 | goto out; |
9157c31d TM |
585 | do { |
586 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
587 | break; | |
588 | spin_lock(&clp->cl_lock); | |
589 | sp = nfs4_insert_state_owner_locked(new); | |
590 | spin_unlock(&clp->cl_lock); | |
591 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
592 | if (sp != new) |
593 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
594 | out: |
595 | nfs4_gc_state_owners(server); | |
9f958ab8 | 596 | return sp; |
1da177e4 LT |
597 | } |
598 | ||
24d292b8 CL |
599 | /** |
600 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
601 | * @sp: state owner data to release | |
7bf97bc2 TM |
602 | * |
603 | * Note that we keep released state owners on an LRU | |
604 | * list. | |
605 | * This caches valid state owners so that they can be | |
606 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
607 | * It also pins the uniquifier of dropped state owners for | |
608 | * a while, to ensure that those state owner names are | |
609 | * never reused. | |
24d292b8 | 610 | */ |
1da177e4 LT |
611 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
612 | { | |
0aaaf5c4 CL |
613 | struct nfs_server *server = sp->so_server; |
614 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
615 | |
616 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
617 | return; | |
0aaaf5c4 | 618 | |
7bf97bc2 TM |
619 | sp->so_expires = jiffies; |
620 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
621 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
622 | } |
623 | ||
624 | /** | |
625 | * nfs4_purge_state_owners - Release all cached state owners | |
626 | * @server: nfs_server with cached state owners to release | |
627 | * | |
628 | * Called at umount time. Remaining state owners will be on | |
629 | * the LRU with ref count of zero. | |
630 | */ | |
631 | void nfs4_purge_state_owners(struct nfs_server *server) | |
632 | { | |
633 | struct nfs_client *clp = server->nfs_client; | |
634 | struct nfs4_state_owner *sp, *tmp; | |
635 | LIST_HEAD(doomed); | |
636 | ||
637 | spin_lock(&clp->cl_lock); | |
638 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
639 | list_move(&sp->so_lru, &doomed); | |
640 | nfs4_remove_state_owner_locked(sp); | |
641 | } | |
1da177e4 | 642 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
643 | |
644 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
645 | list_del(&sp->so_lru); | |
646 | nfs4_free_state_owner(sp); | |
647 | } | |
1da177e4 LT |
648 | } |
649 | ||
650 | static struct nfs4_state * | |
651 | nfs4_alloc_open_state(void) | |
652 | { | |
653 | struct nfs4_state *state; | |
654 | ||
8535b2be | 655 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
656 | if (!state) |
657 | return NULL; | |
1da177e4 LT |
658 | atomic_set(&state->count, 1); |
659 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 660 | spin_lock_init(&state->state_lock); |
8bda4e4c | 661 | seqlock_init(&state->seqlock); |
1da177e4 LT |
662 | return state; |
663 | } | |
664 | ||
4cecb76f | 665 | void |
dc0b027d | 666 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 667 | { |
dc0b027d | 668 | if (state->state == fmode) |
4cecb76f TM |
669 | return; |
670 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
671 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
672 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
673 | list_move(&state->open_states, &state->owner->so_states); |
674 | else | |
675 | list_move_tail(&state->open_states, &state->owner->so_states); | |
676 | } | |
dc0b027d | 677 | state->state = fmode; |
4cecb76f TM |
678 | } |
679 | ||
1da177e4 LT |
680 | static struct nfs4_state * |
681 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
682 | { | |
683 | struct nfs_inode *nfsi = NFS_I(inode); | |
684 | struct nfs4_state *state; | |
685 | ||
686 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 687 | if (state->owner != owner) |
1da177e4 | 688 | continue; |
5d422301 TM |
689 | if (!nfs4_valid_open_stateid(state)) |
690 | continue; | |
1c816efa | 691 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 692 | return state; |
1da177e4 LT |
693 | } |
694 | return NULL; | |
695 | } | |
696 | ||
1da177e4 LT |
697 | static void |
698 | nfs4_free_open_state(struct nfs4_state *state) | |
699 | { | |
700 | kfree(state); | |
701 | } | |
702 | ||
703 | struct nfs4_state * | |
704 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
705 | { | |
706 | struct nfs4_state *state, *new; | |
707 | struct nfs_inode *nfsi = NFS_I(inode); | |
708 | ||
709 | spin_lock(&inode->i_lock); | |
710 | state = __nfs4_find_state_byowner(inode, owner); | |
711 | spin_unlock(&inode->i_lock); | |
712 | if (state) | |
713 | goto out; | |
714 | new = nfs4_alloc_open_state(); | |
ec073428 | 715 | spin_lock(&owner->so_lock); |
1da177e4 LT |
716 | spin_lock(&inode->i_lock); |
717 | state = __nfs4_find_state_byowner(inode, owner); | |
718 | if (state == NULL && new != NULL) { | |
719 | state = new; | |
1da177e4 LT |
720 | state->owner = owner; |
721 | atomic_inc(&owner->so_count); | |
722 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
723 | ihold(inode); |
724 | state->inode = inode; | |
1da177e4 | 725 | spin_unlock(&inode->i_lock); |
ec073428 TM |
726 | /* Note: The reclaim code dictates that we add stateless |
727 | * and read-only stateids to the end of the list */ | |
728 | list_add_tail(&state->open_states, &owner->so_states); | |
729 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
730 | } else { |
731 | spin_unlock(&inode->i_lock); | |
ec073428 | 732 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
733 | if (new) |
734 | nfs4_free_open_state(new); | |
735 | } | |
736 | out: | |
737 | return state; | |
738 | } | |
739 | ||
1da177e4 LT |
740 | void nfs4_put_open_state(struct nfs4_state *state) |
741 | { | |
742 | struct inode *inode = state->inode; | |
743 | struct nfs4_state_owner *owner = state->owner; | |
744 | ||
ec073428 | 745 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 746 | return; |
ec073428 | 747 | spin_lock(&inode->i_lock); |
ba683031 | 748 | list_del(&state->inode_states); |
1da177e4 | 749 | list_del(&state->open_states); |
ec073428 TM |
750 | spin_unlock(&inode->i_lock); |
751 | spin_unlock(&owner->so_lock); | |
1da177e4 | 752 | iput(inode); |
1da177e4 LT |
753 | nfs4_free_open_state(state); |
754 | nfs4_put_state_owner(owner); | |
755 | } | |
756 | ||
757 | /* | |
83c9d41e | 758 | * Close the current file. |
1da177e4 | 759 | */ |
643168c2 | 760 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 761 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 762 | { |
1da177e4 | 763 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 764 | int call_close = 0; |
dc0b027d | 765 | fmode_t newstate; |
1da177e4 LT |
766 | |
767 | atomic_inc(&owner->so_count); | |
1da177e4 | 768 | /* Protect against nfs4_find_state() */ |
ec073428 | 769 | spin_lock(&owner->so_lock); |
dc0b027d | 770 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
771 | case FMODE_READ: |
772 | state->n_rdonly--; | |
773 | break; | |
774 | case FMODE_WRITE: | |
775 | state->n_wronly--; | |
776 | break; | |
777 | case FMODE_READ|FMODE_WRITE: | |
778 | state->n_rdwr--; | |
779 | } | |
003707c7 | 780 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 781 | if (state->n_rdwr == 0) { |
003707c7 | 782 | if (state->n_rdonly == 0) { |
e7616923 | 783 | newstate &= ~FMODE_READ; |
003707c7 TM |
784 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
785 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
786 | } | |
787 | if (state->n_wronly == 0) { | |
e7616923 | 788 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
789 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
790 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
791 | } | |
792 | if (newstate == 0) | |
793 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 794 | } |
003707c7 | 795 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 796 | spin_unlock(&owner->so_lock); |
4cecb76f | 797 | |
003707c7 | 798 | if (!call_close) { |
b39e625b TM |
799 | nfs4_put_open_state(state); |
800 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
801 | } else |
802 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
803 | } |
804 | ||
643168c2 | 805 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 806 | { |
643168c2 | 807 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
808 | } |
809 | ||
643168c2 | 810 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 811 | { |
643168c2 | 812 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
813 | } |
814 | ||
815 | /* | |
816 | * Search the state->lock_states for an existing lock_owner | |
817 | * that is compatible with current->files | |
818 | */ | |
819 | static struct nfs4_lock_state * | |
77041ed9 | 820 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
821 | { |
822 | struct nfs4_lock_state *pos; | |
823 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 824 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 825 | continue; |
77041ed9 TM |
826 | switch (pos->ls_owner.lo_type) { |
827 | case NFS4_POSIX_LOCK_TYPE: | |
828 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
829 | continue; | |
830 | break; | |
831 | case NFS4_FLOCK_LOCK_TYPE: | |
832 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
833 | continue; | |
834 | } | |
1da177e4 LT |
835 | atomic_inc(&pos->ls_count); |
836 | return pos; | |
837 | } | |
838 | return NULL; | |
839 | } | |
840 | ||
1da177e4 LT |
841 | /* |
842 | * Return a compatible lock_state. If no initialized lock_state structure | |
843 | * exists, return an uninitialized one. | |
844 | * | |
1da177e4 | 845 | */ |
77041ed9 | 846 | 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 |
847 | { |
848 | struct nfs4_lock_state *lsp; | |
24d292b8 | 849 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 850 | |
8535b2be | 851 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
852 | if (lsp == NULL) |
853 | return NULL; | |
7ba127ab | 854 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 855 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 856 | lsp->ls_state = state; |
77041ed9 TM |
857 | lsp->ls_owner.lo_type = type; |
858 | switch (lsp->ls_owner.lo_type) { | |
859 | case NFS4_FLOCK_LOCK_TYPE: | |
860 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
861 | break; | |
862 | case NFS4_POSIX_LOCK_TYPE: | |
863 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
864 | break; | |
865 | default: | |
d2d7ce28 | 866 | goto out_free; |
77041ed9 | 867 | } |
48c22eb2 TM |
868 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
869 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 870 | goto out_free; |
8d0a8a9d | 871 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 872 | return lsp; |
d2d7ce28 TM |
873 | out_free: |
874 | kfree(lsp); | |
875 | return NULL; | |
1da177e4 LT |
876 | } |
877 | ||
5ae67c4f | 878 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 879 | { |
48c22eb2 | 880 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 881 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
882 | kfree(lsp); |
883 | } | |
884 | ||
1da177e4 LT |
885 | /* |
886 | * Return a compatible lock_state. If no initialized lock_state structure | |
887 | * exists, return an uninitialized one. | |
888 | * | |
1da177e4 | 889 | */ |
77041ed9 | 890 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 891 | { |
8d0a8a9d | 892 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 893 | |
8d0a8a9d TM |
894 | for(;;) { |
895 | spin_lock(&state->state_lock); | |
77041ed9 | 896 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
897 | if (lsp != NULL) |
898 | break; | |
899 | if (new != NULL) { | |
8d0a8a9d TM |
900 | list_add(&new->ls_locks, &state->lock_states); |
901 | set_bit(LK_STATE_IN_USE, &state->flags); | |
902 | lsp = new; | |
903 | new = NULL; | |
904 | break; | |
905 | } | |
906 | spin_unlock(&state->state_lock); | |
77041ed9 | 907 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
908 | if (new == NULL) |
909 | return NULL; | |
910 | } | |
911 | spin_unlock(&state->state_lock); | |
9f958ab8 | 912 | if (new != NULL) |
5ae67c4f | 913 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
914 | return lsp; |
915 | } | |
916 | ||
917 | /* | |
8d0a8a9d TM |
918 | * Release reference to lock_state, and free it if we see that |
919 | * it is no longer in use | |
1da177e4 | 920 | */ |
faf5f49c | 921 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 922 | { |
c8b2d0bf | 923 | struct nfs_server *server; |
8d0a8a9d | 924 | struct nfs4_state *state; |
1da177e4 | 925 | |
8d0a8a9d TM |
926 | if (lsp == NULL) |
927 | return; | |
928 | state = lsp->ls_state; | |
929 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
930 | return; | |
931 | list_del(&lsp->ls_locks); | |
932 | if (list_empty(&state->lock_states)) | |
933 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
934 | spin_unlock(&state->state_lock); | |
c8b2d0bf | 935 | server = state->owner->so_server; |
795a88c9 | 936 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
c8b2d0bf TM |
937 | struct nfs_client *clp = server->nfs_client; |
938 | ||
939 | clp->cl_mvops->free_lock_state(server, lsp); | |
940 | } else | |
941 | nfs4_free_lock_state(server, lsp); | |
1da177e4 LT |
942 | } |
943 | ||
8d0a8a9d | 944 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 945 | { |
8d0a8a9d | 946 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 947 | |
8d0a8a9d TM |
948 | dst->fl_u.nfs4_fl.owner = lsp; |
949 | atomic_inc(&lsp->ls_count); | |
950 | } | |
1da177e4 | 951 | |
8d0a8a9d | 952 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 953 | { |
8d0a8a9d | 954 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
955 | } |
956 | ||
6aed6285 | 957 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
958 | .fl_copy_lock = nfs4_fl_copy_lock, |
959 | .fl_release_private = nfs4_fl_release_lock, | |
960 | }; | |
961 | ||
962 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 963 | { |
8d0a8a9d TM |
964 | struct nfs4_lock_state *lsp; |
965 | ||
966 | if (fl->fl_ops != NULL) | |
967 | return 0; | |
77041ed9 TM |
968 | if (fl->fl_flags & FL_POSIX) |
969 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
970 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
971 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
972 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
973 | else |
974 | return -EINVAL; | |
8d0a8a9d TM |
975 | if (lsp == NULL) |
976 | return -ENOMEM; | |
977 | fl->fl_u.nfs4_fl.owner = lsp; | |
978 | fl->fl_ops = &nfs4_fl_lock_ops; | |
979 | return 0; | |
1da177e4 LT |
980 | } |
981 | ||
5521abfd TM |
982 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
983 | struct nfs4_state *state, | |
2a369153 | 984 | const struct nfs_lockowner *lockowner) |
1da177e4 | 985 | { |
8d0a8a9d | 986 | struct nfs4_lock_state *lsp; |
2a369153 TM |
987 | fl_owner_t fl_owner; |
988 | pid_t fl_pid; | |
5521abfd | 989 | int ret = -ENOENT; |
1da177e4 | 990 | |
2a369153 TM |
991 | |
992 | if (lockowner == NULL) | |
993 | goto out; | |
994 | ||
8d0a8a9d | 995 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 996 | goto out; |
1da177e4 | 997 | |
2a369153 TM |
998 | fl_owner = lockowner->l_owner; |
999 | fl_pid = lockowner->l_pid; | |
8d0a8a9d | 1000 | spin_lock(&state->state_lock); |
77041ed9 | 1001 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
795a88c9 | 1002 | if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
f597c537 | 1003 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd TM |
1004 | ret = 0; |
1005 | smp_rmb(); | |
1006 | if (!list_empty(&lsp->ls_seqid.list)) | |
1007 | ret = -EWOULDBLOCK; | |
4fc8796d | 1008 | } |
8d0a8a9d | 1009 | spin_unlock(&state->state_lock); |
1da177e4 | 1010 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
1011 | out: |
1012 | return ret; | |
1013 | } | |
1014 | ||
5521abfd | 1015 | static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 1016 | { |
92b40e93 | 1017 | const nfs4_stateid *src; |
5521abfd | 1018 | int ret; |
4fc8796d TM |
1019 | int seq; |
1020 | ||
1021 | do { | |
92b40e93 | 1022 | src = &zero_stateid; |
4fc8796d | 1023 | seq = read_seqbegin(&state->seqlock); |
92b40e93 TM |
1024 | if (test_bit(NFS_OPEN_STATE, &state->flags)) |
1025 | src = &state->open_stateid; | |
1026 | nfs4_stateid_copy(dst, src); | |
5521abfd TM |
1027 | ret = 0; |
1028 | smp_rmb(); | |
1029 | if (!list_empty(&state->owner->so_seqid.list)) | |
1030 | ret = -EWOULDBLOCK; | |
4fc8796d | 1031 | } while (read_seqretry(&state->seqlock, seq)); |
5521abfd | 1032 | return ret; |
4fc8796d TM |
1033 | } |
1034 | ||
1035 | /* | |
1036 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1037 | * requests. | |
1038 | */ | |
5521abfd | 1039 | int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
2a369153 | 1040 | fmode_t fmode, const struct nfs_lockowner *lockowner) |
4fc8796d | 1041 | { |
5521abfd | 1042 | int ret = 0; |
4fc8796d | 1043 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) |
5521abfd TM |
1044 | goto out; |
1045 | ret = nfs4_copy_lock_stateid(dst, state, lockowner); | |
1046 | if (ret != -ENOENT) | |
1047 | goto out; | |
1048 | ret = nfs4_copy_open_stateid(dst, state); | |
1049 | out: | |
3b66486c TM |
1050 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1051 | dst->seqid = 0; | |
5521abfd | 1052 | return ret; |
1da177e4 LT |
1053 | } |
1054 | ||
8535b2be | 1055 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1056 | { |
cee54fc9 TM |
1057 | struct nfs_seqid *new; |
1058 | ||
8535b2be | 1059 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
1060 | if (new != NULL) { |
1061 | new->sequence = counter; | |
2f74c0a0 | 1062 | INIT_LIST_HEAD(&new->list); |
4601df20 | 1063 | new->task = NULL; |
cee54fc9 TM |
1064 | } |
1065 | return new; | |
1066 | } | |
1067 | ||
72211dbe | 1068 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1069 | { |
4601df20 | 1070 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1071 | |
4601df20 TM |
1072 | if (list_empty(&seqid->list)) |
1073 | return; | |
1074 | sequence = seqid->sequence; | |
1075 | spin_lock(&sequence->lock); | |
1076 | list_del_init(&seqid->list); | |
1077 | if (!list_empty(&sequence->list)) { | |
1078 | struct nfs_seqid *next; | |
1079 | ||
1080 | next = list_first_entry(&sequence->list, | |
1081 | struct nfs_seqid, list); | |
1082 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1083 | } |
4601df20 | 1084 | spin_unlock(&sequence->lock); |
72211dbe TM |
1085 | } |
1086 | ||
1087 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1088 | { | |
1089 | nfs_release_seqid(seqid); | |
cee54fc9 | 1090 | kfree(seqid); |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | /* | |
cee54fc9 TM |
1094 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1095 | * failed with a seqid incrementing error - | |
1096 | * see comments nfs_fs.h:seqid_mutating_error() | |
1097 | */ | |
88d90939 | 1098 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1099 | { |
1100 | switch (status) { | |
1101 | case 0: | |
1102 | break; | |
1103 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1104 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1105 | return; | |
9a3ba432 | 1106 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1107 | " sequence-id error on an" |
1108 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1109 | seqid->sequence); |
cee54fc9 TM |
1110 | case -NFS4ERR_STALE_CLIENTID: |
1111 | case -NFS4ERR_STALE_STATEID: | |
1112 | case -NFS4ERR_BAD_STATEID: | |
1113 | case -NFS4ERR_BADXDR: | |
1114 | case -NFS4ERR_RESOURCE: | |
1115 | case -NFS4ERR_NOFILEHANDLE: | |
1116 | /* Non-seqid mutating errors */ | |
1117 | return; | |
1118 | }; | |
1119 | /* | |
1120 | * Note: no locking needed as we are guaranteed to be first | |
1121 | * on the sequence list | |
1122 | */ | |
1123 | seqid->sequence->counter++; | |
1124 | } | |
1125 | ||
1126 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1127 | { | |
34dc1ad7 BH |
1128 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1129 | struct nfs4_state_owner, so_seqid); | |
1130 | struct nfs_server *server = sp->so_server; | |
1131 | ||
1132 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1133 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1134 | if (!nfs4_has_session(server->nfs_client)) |
1135 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1136 | } |
1137 | ||
1138 | /* | |
cee54fc9 TM |
1139 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1140 | * failed with a seqid incrementing error - | |
1141 | * see comments nfs_fs.h:seqid_mutating_error() | |
1142 | */ | |
1143 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1144 | { | |
88d90939 | 1145 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1146 | } |
1147 | ||
1148 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1149 | { | |
7ba127ab | 1150 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1151 | int status = 0; |
1152 | ||
1153 | spin_lock(&sequence->lock); | |
4601df20 | 1154 | seqid->task = task; |
2f74c0a0 TM |
1155 | if (list_empty(&seqid->list)) |
1156 | list_add_tail(&seqid->list, &sequence->list); | |
1157 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1158 | goto unlock; | |
5d00837b | 1159 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1160 | status = -EAGAIN; |
1161 | unlock: | |
cee54fc9 TM |
1162 | spin_unlock(&sequence->lock); |
1163 | return status; | |
1da177e4 LT |
1164 | } |
1165 | ||
e005e804 | 1166 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1167 | |
e005e804 | 1168 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1169 | { |
1170 | smp_mb__before_clear_bit(); | |
e005e804 | 1171 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1172 | smp_mb__after_clear_bit(); |
e005e804 | 1173 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1174 | rpc_wake_up(&clp->cl_rpcwaitq); |
1175 | } | |
1176 | ||
1da177e4 | 1177 | /* |
e005e804 | 1178 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1179 | */ |
b0d3ded1 | 1180 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1181 | { |
5043e900 | 1182 | struct task_struct *task; |
2446ab60 | 1183 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1184 | |
e005e804 TM |
1185 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1186 | return; | |
5043e900 TM |
1187 | __module_get(THIS_MODULE); |
1188 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1189 | |
1190 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1191 | * manager is the only thread that ever changes the rpc_xprt | |
1192 | * after it's initialized. At this point, we're single threaded. */ | |
1193 | rcu_read_lock(); | |
1194 | snprintf(buf, sizeof(buf), "%s-manager", | |
1195 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1196 | rcu_read_unlock(); | |
1197 | task = kthread_run(nfs4_run_state_manager, clp, buf); | |
1198 | if (IS_ERR(task)) { | |
1199 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1200 | __func__, PTR_ERR(task)); | |
1201 | nfs4_clear_state_manager_bit(clp); | |
1202 | nfs_put_client(clp); | |
1203 | module_put(THIS_MODULE); | |
1204 | } | |
1da177e4 LT |
1205 | } |
1206 | ||
1207 | /* | |
0400a6b0 | 1208 | * Schedule a lease recovery attempt |
1da177e4 | 1209 | */ |
0400a6b0 | 1210 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1211 | { |
1212 | if (!clp) | |
1213 | return; | |
e598d843 TM |
1214 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1215 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1216 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1217 | clp->cl_hostname); | |
e005e804 | 1218 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1219 | } |
9cb81968 | 1220 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1221 | |
33021279 TM |
1222 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1223 | { | |
1224 | int res; | |
1225 | ||
1226 | might_sleep(); | |
1227 | ||
1228 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, | |
1229 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1230 | if (res) | |
1231 | return res; | |
1232 | ||
1233 | if (clp->cl_cons_state < 0) | |
1234 | return clp->cl_cons_state; | |
1235 | return 0; | |
1236 | } | |
1237 | ||
1238 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1239 | { | |
1240 | unsigned int loop; | |
1241 | int ret; | |
1242 | ||
1243 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1244 | ret = nfs4_wait_clnt_recover(clp); | |
1245 | if (ret != 0) | |
1246 | break; | |
1247 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1248 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1249 | break; | |
1250 | nfs4_schedule_state_manager(clp); | |
1251 | ret = -EIO; | |
1252 | } | |
1253 | return ret; | |
1254 | } | |
1255 | ||
ad1e3968 TM |
1256 | /* |
1257 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1258 | * @clp: client to process | |
1259 | * | |
1260 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1261 | * resend of the SETCLIENTID and hence re-establish the | |
1262 | * callback channel. Then return all existing delegations. | |
1263 | */ | |
1264 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1265 | { | |
1266 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1267 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1268 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1269 | clp->cl_hostname); | |
ad1e3968 TM |
1270 | } |
1271 | ||
042b60be TM |
1272 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1273 | { | |
ad1e3968 | 1274 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1275 | nfs4_schedule_state_manager(clp); |
1276 | } | |
1277 | ||
f9feab1e | 1278 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1279 | { |
1280 | ||
1281 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1282 | /* Don't recover state that expired before the reboot */ | |
1283 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1284 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1285 | return 0; | |
1286 | } | |
7eff03ae | 1287 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1288 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1289 | return 1; | |
1290 | } | |
1291 | ||
f9feab1e | 1292 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1293 | { |
1294 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1295 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1296 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1297 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1298 | return 1; | |
1299 | } | |
1300 | ||
5d422301 | 1301 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1302 | { |
1303 | struct nfs_client *clp = server->nfs_client; | |
1304 | ||
5d422301 TM |
1305 | if (!nfs4_valid_open_stateid(state)) |
1306 | return -EBADF; | |
0400a6b0 | 1307 | nfs4_state_mark_reclaim_nograce(clp, state); |
cc0a9843 TM |
1308 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1309 | clp->cl_hostname); | |
0400a6b0 | 1310 | nfs4_schedule_state_manager(clp); |
5d422301 | 1311 | return 0; |
0400a6b0 | 1312 | } |
9cb81968 | 1313 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1314 | |
a1d0b5ee TM |
1315 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1316 | const nfs4_stateid *stateid) | |
1317 | { | |
1318 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1319 | struct nfs_inode *nfsi = NFS_I(inode); | |
1320 | struct nfs_open_context *ctx; | |
1321 | struct nfs4_state *state; | |
1322 | bool found = false; | |
1323 | ||
1324 | spin_lock(&inode->i_lock); | |
1325 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1326 | state = ctx->state; | |
1327 | if (state == NULL) | |
1328 | continue; | |
1329 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1330 | continue; | |
f597c537 | 1331 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1332 | continue; |
1333 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1334 | found = true; | |
1335 | } | |
1336 | spin_unlock(&inode->i_lock); | |
1337 | if (found) | |
1338 | nfs4_schedule_state_manager(clp); | |
1339 | } | |
1340 | ||
c58c8441 TM |
1341 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1342 | { | |
1343 | struct inode *inode = state->inode; | |
1344 | struct nfs_inode *nfsi = NFS_I(inode); | |
1345 | struct nfs_open_context *ctx; | |
1346 | ||
1347 | spin_lock(&inode->i_lock); | |
1348 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1349 | if (ctx->state != state) | |
1350 | continue; | |
1351 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1352 | } | |
1353 | spin_unlock(&inode->i_lock); | |
1354 | } | |
1355 | ||
5d422301 TM |
1356 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1357 | { | |
1358 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1359 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1360 | } |
1361 | ||
a1d0b5ee | 1362 | |
02860014 | 1363 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1364 | { |
1365 | struct inode *inode = state->inode; | |
19e03c57 | 1366 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1367 | struct file_lock *fl; |
1368 | int status = 0; | |
1369 | ||
3f09df70 TM |
1370 | if (inode->i_flock == NULL) |
1371 | return 0; | |
1372 | ||
1373 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1374 | down_write(&nfsi->rwsem); |
3f09df70 | 1375 | /* Protect inode->i_flock using the BKL */ |
b89f4321 | 1376 | lock_flocks(); |
90dc7d27 | 1377 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1378 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1379 | continue; |
cd3758e3 | 1380 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1381 | continue; |
b89f4321 | 1382 | unlock_flocks(); |
1da177e4 | 1383 | status = ops->recover_lock(state, fl); |
1da177e4 | 1384 | switch (status) { |
965b5d67 TM |
1385 | case 0: |
1386 | break; | |
1387 | case -ESTALE: | |
1388 | case -NFS4ERR_ADMIN_REVOKED: | |
1389 | case -NFS4ERR_STALE_STATEID: | |
1390 | case -NFS4ERR_BAD_STATEID: | |
1391 | case -NFS4ERR_EXPIRED: | |
1392 | case -NFS4ERR_NO_GRACE: | |
1393 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1394 | case -NFS4ERR_BADSESSION: |
1395 | case -NFS4ERR_BADSLOT: | |
1396 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1397 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1398 | goto out; |
1da177e4 | 1399 | default: |
a030889a WAA |
1400 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1401 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1402 | case -ENOMEM: |
1403 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1404 | case -NFS4ERR_RECLAIM_BAD: |
1405 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1406 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1407 | status = 0; |
1da177e4 | 1408 | } |
b89f4321 | 1409 | lock_flocks(); |
1da177e4 | 1410 | } |
b89f4321 | 1411 | unlock_flocks(); |
965b5d67 | 1412 | out: |
19e03c57 | 1413 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1414 | return status; |
1415 | } | |
1416 | ||
02860014 | 1417 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1418 | { |
1419 | struct nfs4_state *state; | |
1420 | struct nfs4_lock_state *lock; | |
1421 | int status = 0; | |
1422 | ||
1423 | /* Note: we rely on the sp->so_states list being ordered | |
1424 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1425 | * states first. | |
1426 | * This is needed to ensure that the server won't give us any | |
1427 | * read delegations that we have to return if, say, we are | |
1428 | * recovering after a network partition or a reboot from a | |
1429 | * server that doesn't support a grace period. | |
1430 | */ | |
fe1d8195 | 1431 | spin_lock(&sp->so_lock); |
c137afab TM |
1432 | write_seqcount_begin(&sp->so_reclaim_seqcount); |
1433 | restart: | |
1da177e4 | 1434 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1435 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1436 | continue; | |
5d422301 TM |
1437 | if (!nfs4_valid_open_stateid(state)) |
1438 | continue; | |
1da177e4 LT |
1439 | if (state->state == 0) |
1440 | continue; | |
fe1d8195 TM |
1441 | atomic_inc(&state->count); |
1442 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1443 | status = ops->recover_open(sp, state); |
1da177e4 | 1444 | if (status >= 0) { |
02860014 TM |
1445 | status = nfs4_reclaim_locks(state, ops); |
1446 | if (status >= 0) { | |
4b44b40e | 1447 | spin_lock(&state->state_lock); |
02860014 | 1448 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
795a88c9 | 1449 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
96dcadc2 WD |
1450 | pr_warn_ratelimited("NFS: " |
1451 | "%s: Lock reclaim " | |
a030889a | 1452 | "failed!\n", __func__); |
02860014 | 1453 | } |
4b44b40e | 1454 | spin_unlock(&state->state_lock); |
fe1d8195 | 1455 | nfs4_put_open_state(state); |
c137afab | 1456 | spin_lock(&sp->so_lock); |
fe1d8195 | 1457 | goto restart; |
1da177e4 | 1458 | } |
1da177e4 LT |
1459 | } |
1460 | switch (status) { | |
1461 | default: | |
a030889a WAA |
1462 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1463 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1464 | case -ENOENT: |
965b5d67 | 1465 | case -ENOMEM: |
b79a4a1b | 1466 | case -ESTALE: |
1da177e4 LT |
1467 | /* |
1468 | * Open state on this file cannot be recovered | |
1469 | * All we can do is revert to using the zero stateid. | |
1470 | */ | |
5d422301 | 1471 | nfs4_state_mark_recovery_failed(state, status); |
1da177e4 | 1472 | break; |
91876b13 TM |
1473 | case -EAGAIN: |
1474 | ssleep(1); | |
965b5d67 TM |
1475 | case -NFS4ERR_ADMIN_REVOKED: |
1476 | case -NFS4ERR_STALE_STATEID: | |
1477 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1478 | case -NFS4ERR_RECLAIM_BAD: |
1479 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1480 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1481 | break; |
1da177e4 LT |
1482 | case -NFS4ERR_EXPIRED: |
1483 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1484 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1485 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1486 | case -NFS4ERR_BADSESSION: |
1487 | case -NFS4ERR_BADSLOT: | |
1488 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1489 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1490 | goto out_err; |
1491 | } | |
fe1d8195 | 1492 | nfs4_put_open_state(state); |
c137afab | 1493 | spin_lock(&sp->so_lock); |
fe1d8195 | 1494 | goto restart; |
1da177e4 | 1495 | } |
c137afab | 1496 | write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1497 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1498 | return 0; |
1499 | out_err: | |
fe1d8195 | 1500 | nfs4_put_open_state(state); |
c137afab TM |
1501 | spin_lock(&sp->so_lock); |
1502 | write_seqcount_end(&sp->so_reclaim_seqcount); | |
1503 | spin_unlock(&sp->so_lock); | |
1da177e4 LT |
1504 | return status; |
1505 | } | |
1506 | ||
b79a4a1b TM |
1507 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1508 | { | |
1509 | struct nfs4_lock_state *lock; | |
1510 | ||
1511 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1512 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1513 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1514 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1515 | spin_lock(&state->state_lock); |
b79a4a1b | 1516 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1517 | lock->ls_seqid.flags = 0; |
795a88c9 | 1518 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1519 | } |
4b44b40e | 1520 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1521 | } |
1522 | ||
24d292b8 CL |
1523 | static void nfs4_reset_seqids(struct nfs_server *server, |
1524 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1525 | { |
24d292b8 | 1526 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1527 | struct nfs4_state_owner *sp; |
9f958ab8 | 1528 | struct rb_node *pos; |
cee54fc9 | 1529 | struct nfs4_state *state; |
cee54fc9 | 1530 | |
24d292b8 CL |
1531 | spin_lock(&clp->cl_lock); |
1532 | for (pos = rb_first(&server->state_owners); | |
1533 | pos != NULL; | |
1534 | pos = rb_next(pos)) { | |
1535 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1536 | sp->so_seqid.flags = 0; |
ec073428 | 1537 | spin_lock(&sp->so_lock); |
cee54fc9 | 1538 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1539 | if (mark_reclaim(clp, state)) |
1540 | nfs4_clear_open_state(state); | |
cee54fc9 | 1541 | } |
ec073428 | 1542 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1543 | } |
24d292b8 CL |
1544 | spin_unlock(&clp->cl_lock); |
1545 | } | |
1546 | ||
1547 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1548 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1549 | { | |
1550 | struct nfs_server *server; | |
1551 | ||
1552 | rcu_read_lock(); | |
1553 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1554 | nfs4_reset_seqids(server, mark_reclaim); | |
1555 | rcu_read_unlock(); | |
cee54fc9 TM |
1556 | } |
1557 | ||
b79a4a1b TM |
1558 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1559 | { | |
1560 | /* Mark all delegations for reclaim */ | |
1561 | nfs_delegation_mark_reclaim(clp); | |
1562 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1563 | } | |
1564 | ||
fce5c838 | 1565 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 TM |
1566 | const struct nfs4_state_recovery_ops *ops, |
1567 | struct rpc_cred *cred) | |
fce5c838 RL |
1568 | { |
1569 | /* Notify the server we're done reclaiming our state */ | |
1570 | if (ops->reclaim_complete) | |
965e9c23 | 1571 | (void)ops->reclaim_complete(clp, cred); |
fce5c838 RL |
1572 | } |
1573 | ||
24d292b8 | 1574 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1575 | { |
24d292b8 | 1576 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1577 | struct nfs4_state_owner *sp; |
1578 | struct rb_node *pos; | |
1579 | struct nfs4_state *state; | |
1580 | ||
24d292b8 CL |
1581 | spin_lock(&clp->cl_lock); |
1582 | for (pos = rb_first(&server->state_owners); | |
1583 | pos != NULL; | |
1584 | pos = rb_next(pos)) { | |
1585 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1586 | spin_lock(&sp->so_lock); |
1587 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1588 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1589 | &state->flags)) | |
b79a4a1b TM |
1590 | continue; |
1591 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1592 | } | |
1593 | spin_unlock(&sp->so_lock); | |
1594 | } | |
24d292b8 CL |
1595 | spin_unlock(&clp->cl_lock); |
1596 | } | |
1597 | ||
1598 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1599 | { | |
1600 | struct nfs_server *server; | |
1601 | ||
1602 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1603 | return 0; | |
1604 | ||
1605 | rcu_read_lock(); | |
1606 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1607 | nfs4_clear_reclaim_server(server); | |
1608 | rcu_read_unlock(); | |
b79a4a1b TM |
1609 | |
1610 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1611 | return 1; |
1612 | } | |
1613 | ||
1614 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1615 | { | |
965e9c23 TM |
1616 | const struct nfs4_state_recovery_ops *ops; |
1617 | struct rpc_cred *cred; | |
1618 | ||
6eaa6149 TM |
1619 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1620 | return; | |
965e9c23 TM |
1621 | ops = clp->cl_mvops->reboot_recovery_ops; |
1622 | cred = ops->get_clid_cred(clp); | |
1623 | nfs4_reclaim_complete(clp, ops, cred); | |
1624 | put_rpccred(cred); | |
b79a4a1b TM |
1625 | } |
1626 | ||
1627 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1628 | { | |
1629 | nfs_delegation_mark_reclaim(clp); | |
1630 | nfs_delegation_reap_unclaimed(clp); | |
1631 | } | |
1632 | ||
1633 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1634 | { | |
1635 | nfs_delegation_clear_all(clp); | |
1636 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1637 | } | |
1638 | ||
4f7cdf18 | 1639 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1640 | { |
1641 | switch (error) { | |
4f38e4aa TM |
1642 | case 0: |
1643 | break; | |
e598d843 | 1644 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1645 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1646 | break; |
c8b7ae3d TM |
1647 | case -NFS4ERR_NO_GRACE: |
1648 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1649 | break; |
e598d843 TM |
1650 | case -NFS4ERR_STALE_CLIENTID: |
1651 | case -NFS4ERR_LEASE_MOVED: | |
1652 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1653 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1654 | nfs4_state_start_reclaim_reboot(clp); |
1655 | break; | |
1656 | case -NFS4ERR_EXPIRED: | |
1657 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1658 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1659 | break; |
c3fad1b1 AA |
1660 | case -NFS4ERR_BADSESSION: |
1661 | case -NFS4ERR_BADSLOT: | |
1662 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1663 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1664 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1665 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1666 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1667 | /* Zero session reset errors */ |
4f38e4aa | 1668 | break; |
7c5d7256 TM |
1669 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1670 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1671 | break; | |
4f38e4aa | 1672 | default: |
cc0a9843 TM |
1673 | dprintk("%s: failed to handle error %d for server %s\n", |
1674 | __func__, error, clp->cl_hostname); | |
4f38e4aa | 1675 | return error; |
e598d843 | 1676 | } |
cc0a9843 TM |
1677 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1678 | clp->cl_hostname); | |
4f38e4aa | 1679 | return 0; |
e598d843 TM |
1680 | } |
1681 | ||
02860014 | 1682 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1683 | { |
24d292b8 CL |
1684 | struct nfs4_state_owner *sp; |
1685 | struct nfs_server *server; | |
9f958ab8 | 1686 | struct rb_node *pos; |
1da177e4 LT |
1687 | int status = 0; |
1688 | ||
7eff03ae | 1689 | restart: |
24d292b8 CL |
1690 | rcu_read_lock(); |
1691 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1692 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1693 | spin_lock(&clp->cl_lock); |
1694 | for (pos = rb_first(&server->state_owners); | |
1695 | pos != NULL; | |
1696 | pos = rb_next(pos)) { | |
1697 | sp = rb_entry(pos, | |
1698 | struct nfs4_state_owner, so_server_node); | |
1699 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1700 | &sp->so_flags)) | |
1701 | continue; | |
1702 | atomic_inc(&sp->so_count); | |
1703 | spin_unlock(&clp->cl_lock); | |
1704 | rcu_read_unlock(); | |
1705 | ||
1706 | status = nfs4_reclaim_open_state(sp, ops); | |
1707 | if (status < 0) { | |
1708 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1709 | nfs4_put_state_owner(sp); | |
1710 | return nfs4_recovery_handle_error(clp, status); | |
1711 | } | |
1712 | ||
7eff03ae | 1713 | nfs4_put_state_owner(sp); |
24d292b8 | 1714 | goto restart; |
7eff03ae | 1715 | } |
24d292b8 | 1716 | spin_unlock(&clp->cl_lock); |
02860014 | 1717 | } |
24d292b8 | 1718 | rcu_read_unlock(); |
02860014 TM |
1719 | return status; |
1720 | } | |
1721 | ||
1722 | static int nfs4_check_lease(struct nfs_client *clp) | |
1723 | { | |
1724 | struct rpc_cred *cred; | |
c48f4f35 TM |
1725 | const struct nfs4_state_maintenance_ops *ops = |
1726 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1727 | int status; |
1da177e4 | 1728 | |
0f605b56 TM |
1729 | /* Is the client already known to have an expired lease? */ |
1730 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1731 | return 0; | |
a7b72103 AA |
1732 | spin_lock(&clp->cl_lock); |
1733 | cred = ops->get_state_renewal_cred_locked(clp); | |
1734 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1735 | if (cred == NULL) { |
1736 | cred = nfs4_get_setclientid_cred(clp); | |
4f38e4aa | 1737 | status = -ENOKEY; |
0f605b56 TM |
1738 | if (cred == NULL) |
1739 | goto out; | |
286d7d6a | 1740 | } |
8e69514f | 1741 | status = ops->renew_lease(clp, cred); |
0f605b56 | 1742 | put_rpccred(cred); |
bc7a05ca TM |
1743 | if (status == -ETIMEDOUT) { |
1744 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1745 | return 0; | |
1746 | } | |
0f605b56 | 1747 | out: |
4f7cdf18 | 1748 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1749 | } |
1750 | ||
47b803c8 AA |
1751 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1752 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1753 | */ |
1754 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1755 | { | |
1756 | switch (status) { | |
89a21736 TM |
1757 | case -NFS4ERR_SEQ_MISORDERED: |
1758 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1759 | return -ESERVERFAULT; | |
1760 | /* Lease confirmation error: retry after purging the lease */ | |
1761 | ssleep(1); | |
47b803c8 AA |
1762 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1763 | break; | |
2a6ee6aa TM |
1764 | case -NFS4ERR_STALE_CLIENTID: |
1765 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 AA |
1766 | nfs4_state_clear_reclaim_reboot(clp); |
1767 | nfs4_state_start_reclaim_reboot(clp); | |
2a6ee6aa | 1768 | break; |
de734831 CL |
1769 | case -NFS4ERR_CLID_INUSE: |
1770 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1771 | clp->cl_hostname); | |
1772 | nfs_mark_client_ready(clp, -EPERM); | |
1773 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1774 | return -EPERM; | |
2a6ee6aa | 1775 | case -EACCES: |
2a6ee6aa TM |
1776 | case -NFS4ERR_DELAY: |
1777 | case -ETIMEDOUT: | |
1778 | case -EAGAIN: | |
1779 | ssleep(1); | |
1780 | break; | |
1781 | ||
1782 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1783 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1784 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1785 | dprintk("%s: exit with error %d for server %s\n", |
1786 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1787 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1788 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1789 | * in nfs4_exchange_id */ | |
1790 | default: | |
cc0a9843 TM |
1791 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1792 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1793 | return status; |
1794 | } | |
1795 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1796 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1797 | clp->cl_hostname); | |
2a6ee6aa TM |
1798 | return 0; |
1799 | } | |
1800 | ||
b42353ff | 1801 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 TM |
1802 | { |
1803 | struct rpc_cred *cred; | |
c48f4f35 TM |
1804 | const struct nfs4_state_recovery_ops *ops = |
1805 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1806 | int status; |
02860014 | 1807 | |
90a16617 | 1808 | cred = ops->get_clid_cred(clp); |
2a6ee6aa TM |
1809 | if (cred == NULL) |
1810 | return -ENOENT; | |
1811 | status = ops->establish_clid(clp, cred); | |
1812 | put_rpccred(cred); | |
1813 | if (status != 0) | |
b42353ff TM |
1814 | return status; |
1815 | pnfs_destroy_all_layouts(clp); | |
1816 | return 0; | |
1817 | } | |
1818 | ||
6bbb4ae8 CL |
1819 | /* |
1820 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1821 | * to local errno values. | |
1822 | */ | |
b42353ff TM |
1823 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1824 | { | |
1825 | int status; | |
1826 | ||
1827 | status = nfs4_establish_lease(clp); | |
1828 | if (status < 0) | |
1829 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1830 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
1831 | nfs4_state_start_reclaim_nograce(clp); | |
1832 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1833 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1834 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1835 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1836 | return 0; | |
1837 | } | |
1838 | ||
1839 | static int nfs4_purge_lease(struct nfs_client *clp) | |
1840 | { | |
1841 | int status; | |
1842 | ||
1843 | status = nfs4_establish_lease(clp); | |
1844 | if (status < 0) | |
2a6ee6aa | 1845 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
1846 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1847 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1848 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 1849 | return 0; |
02860014 TM |
1850 | } |
1851 | ||
05f4c350 CL |
1852 | /** |
1853 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
1854 | * | |
1855 | * @clp: nfs_client under test | |
1856 | * @result: OUT: found nfs_client, or clp | |
1857 | * | |
1858 | * Returns zero or a negative errno. If zero is returned, | |
1859 | * an nfs_client pointer is planted in "result". | |
1860 | * | |
1861 | * Note: since we are invoked in process context, and | |
1862 | * not from inside the state manager, we cannot use | |
1863 | * nfs4_handle_reclaim_lease_error(). | |
1864 | */ | |
1865 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
1866 | struct nfs_client **result) | |
1867 | { | |
1868 | const struct nfs4_state_recovery_ops *ops = | |
1869 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 CL |
1870 | struct rpc_clnt *clnt; |
1871 | struct rpc_cred *cred; | |
4edaa308 | 1872 | int i, status; |
05f4c350 CL |
1873 | |
1874 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
1875 | ||
05f4c350 | 1876 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
1877 | i = 0; |
1878 | ||
1879 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 1880 | again: |
ea33e6c3 | 1881 | status = -ENOENT; |
05f4c350 CL |
1882 | cred = ops->get_clid_cred(clp); |
1883 | if (cred == NULL) | |
1884 | goto out_unlock; | |
1885 | ||
1886 | status = ops->detect_trunking(clp, result, cred); | |
1887 | put_rpccred(cred); | |
1888 | switch (status) { | |
1889 | case 0: | |
1890 | break; | |
05f4c350 CL |
1891 | case -NFS4ERR_DELAY: |
1892 | case -ETIMEDOUT: | |
1893 | case -EAGAIN: | |
1894 | ssleep(1); | |
202c312d | 1895 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
1896 | dprintk("NFS: %s after status %d, retrying\n", |
1897 | __func__, status); | |
1898 | goto again; | |
4edaa308 CL |
1899 | case -EACCES: |
1900 | if (i++) | |
1901 | break; | |
05f4c350 CL |
1902 | case -NFS4ERR_CLID_INUSE: |
1903 | case -NFS4ERR_WRONGSEC: | |
79d852bf | 1904 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
1905 | if (IS_ERR(clnt)) { |
1906 | status = PTR_ERR(clnt); | |
1907 | break; | |
1908 | } | |
b193d59a TM |
1909 | /* Note: this is safe because we haven't yet marked the |
1910 | * client as ready, so we are the only user of | |
1911 | * clp->cl_rpcclient | |
1912 | */ | |
1913 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
1914 | rpc_shutdown_client(clnt); | |
1915 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
1916 | goto again; |
1917 | ||
1918 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1919 | status = -EPROTONOSUPPORT; | |
1920 | break; | |
1921 | ||
1922 | case -EKEYEXPIRED: | |
05f4c350 CL |
1923 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1924 | * in nfs4_exchange_id */ | |
1925 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
1926 | break; |
1927 | default: | |
1928 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
1929 | __func__, status); | |
1930 | status = -EIO; | |
05f4c350 CL |
1931 | } |
1932 | ||
1933 | out_unlock: | |
1934 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
1935 | dprintk("NFS: %s: status = %d\n", __func__, status); |
1936 | return status; | |
1937 | } | |
1938 | ||
76db6d95 | 1939 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1940 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1941 | { |
444f72fe TM |
1942 | struct nfs_client *clp = session->clp; |
1943 | ||
9f594791 TM |
1944 | switch (err) { |
1945 | default: | |
1946 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1947 | break; | |
1948 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1949 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1950 | } | |
444f72fe | 1951 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1952 | } |
cbdabc7f | 1953 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1954 | |
ac074835 TM |
1955 | static void nfs41_ping_server(struct nfs_client *clp) |
1956 | { | |
1957 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
1958 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1959 | nfs4_schedule_state_manager(clp); | |
1960 | } | |
1961 | ||
1962 | void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) | |
1963 | { | |
1964 | nfs41_ping_server(clp); | |
1965 | } | |
1966 | ||
c10e4498 TM |
1967 | void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
1968 | { | |
1969 | nfs41_ping_server(clp); | |
1970 | } | |
1971 | ||
0f79fd6f TM |
1972 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1973 | { | |
1974 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1975 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1976 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1977 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
1978 | dprintk("%s: scheduling reset of all state for server %s!\n", |
1979 | __func__, clp->cl_hostname); | |
0400a6b0 | 1980 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1981 | } |
1982 | } | |
1983 | ||
1984 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1985 | { | |
1986 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1987 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
1988 | dprintk("%s: server %s rebooted!\n", __func__, |
1989 | clp->cl_hostname); | |
0400a6b0 | 1990 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1991 | } |
1992 | } | |
1993 | ||
1994 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1995 | { | |
0f79fd6f | 1996 | nfs4_reset_all_state(clp); |
cc0a9843 | 1997 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
1998 | } |
1999 | ||
2000 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
2001 | { | |
2002 | /* This will need to handle layouts too */ | |
2003 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
2004 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
2005 | clp->cl_hostname); | |
0f79fd6f TM |
2006 | } |
2007 | ||
a9e64442 | 2008 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
2009 | { |
2010 | nfs_expire_all_delegations(clp); | |
2011 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 2012 | nfs4_schedule_state_manager(clp); |
cc0a9843 TM |
2013 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
2014 | clp->cl_hostname); | |
0f79fd6f TM |
2015 | } |
2016 | ||
a9e64442 WAA |
2017 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
2018 | { | |
2019 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
2020 | &clp->cl_state) == 0) | |
2021 | nfs4_schedule_state_manager(clp); | |
2022 | } | |
2023 | ||
0629e370 AB |
2024 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
2025 | { | |
2026 | if (!flags) | |
2027 | return; | |
2c820d9a CL |
2028 | |
2029 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2030 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
2031 | ||
111d489f | 2032 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2033 | nfs41_handle_server_reboot(clp); |
111d489f | 2034 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
2035 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
2036 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
2037 | SEQ4_STATUS_LEASE_MOVED)) |
2038 | nfs41_handle_state_revoked(clp); | |
111d489f | 2039 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2040 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
2041 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2042 | nfs41_handle_backchannel_fault(clp); | |
2043 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2044 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2045 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2046 | } |
2047 | ||
c3fad1b1 AA |
2048 | static int nfs4_reset_session(struct nfs_client *clp) |
2049 | { | |
848f5bda | 2050 | struct rpc_cred *cred; |
c3fad1b1 AA |
2051 | int status; |
2052 | ||
1a47e7a6 TM |
2053 | if (!nfs4_has_session(clp)) |
2054 | return 0; | |
38045412 | 2055 | nfs4_begin_drain_session(clp); |
848f5bda TM |
2056 | cred = nfs4_get_exchange_id_cred(clp); |
2057 | status = nfs4_proc_destroy_session(clp->cl_session, cred); | |
c489ee29 TM |
2058 | switch (status) { |
2059 | case 0: | |
2060 | case -NFS4ERR_BADSESSION: | |
2061 | case -NFS4ERR_DEADSESSION: | |
2062 | break; | |
2063 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2064 | case -NFS4ERR_DELAY: | |
2065 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2066 | status = 0; | |
2067 | ssleep(1); | |
2068 | goto out; | |
2069 | default: | |
f455848a | 2070 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2071 | goto out; |
2072 | } | |
2073 | ||
2074 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2075 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2076 | if (status) { |
cc0a9843 TM |
2077 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2078 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2079 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2080 | goto out; |
2081 | } | |
bda197f5 | 2082 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2083 | dprintk("%s: session reset was successful for server %s!\n", |
2084 | __func__, clp->cl_hostname); | |
41f54a55 | 2085 | out: |
848f5bda TM |
2086 | if (cred) |
2087 | put_rpccred(cred); | |
c3fad1b1 AA |
2088 | return status; |
2089 | } | |
76db6d95 | 2090 | |
a9e64442 WAA |
2091 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2092 | { | |
2cf047c9 TM |
2093 | struct rpc_cred *cred; |
2094 | int ret; | |
2095 | ||
1a47e7a6 TM |
2096 | if (!nfs4_has_session(clp)) |
2097 | return 0; | |
43ac544c | 2098 | nfs4_begin_drain_session(clp); |
2cf047c9 TM |
2099 | cred = nfs4_get_exchange_id_cred(clp); |
2100 | ret = nfs4_proc_bind_conn_to_session(clp, cred); | |
2101 | if (cred) | |
2102 | put_rpccred(cred); | |
43ac544c | 2103 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2104 | switch (ret) { |
2105 | case 0: | |
cc0a9843 TM |
2106 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2107 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2108 | break; |
2109 | case -NFS4ERR_DELAY: | |
2110 | ssleep(1); | |
2111 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2112 | break; | |
2113 | default: | |
2114 | return nfs4_recovery_handle_error(clp, ret); | |
2115 | } | |
2116 | return 0; | |
a9e64442 | 2117 | } |
76db6d95 | 2118 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2119 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 2120 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
2121 | |
2122 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2123 | { | |
2124 | return 0; | |
2125 | } | |
76db6d95 AA |
2126 | #endif /* CONFIG_NFS_V4_1 */ |
2127 | ||
e005e804 | 2128 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2129 | { |
02860014 | 2130 | int status = 0; |
8ed27d4f | 2131 | const char *section = "", *section_sep = ""; |
02860014 | 2132 | |
02860014 | 2133 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2134 | do { |
2c820d9a | 2135 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2136 | section = "purge state"; |
b42353ff | 2137 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2138 | if (status < 0) |
2139 | goto out_error; | |
b42353ff | 2140 | continue; |
2c820d9a CL |
2141 | } |
2142 | ||
b42353ff | 2143 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2144 | section = "lease expired"; |
b79a4a1b TM |
2145 | /* We're going to have to re-establish a clientid */ |
2146 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2147 | if (status < 0) |
b79a4a1b | 2148 | goto out_error; |
b42353ff | 2149 | continue; |
e598d843 TM |
2150 | } |
2151 | ||
c3fad1b1 | 2152 | /* Initialize or reset the session */ |
1a47e7a6 | 2153 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2154 | section = "reset session"; |
4d643d1d | 2155 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2156 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2157 | continue; | |
2158 | if (status < 0) | |
76db6d95 | 2159 | goto out_error; |
76db6d95 | 2160 | } |
b6d408ba | 2161 | |
a9e64442 WAA |
2162 | /* Send BIND_CONN_TO_SESSION */ |
2163 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2164 | &clp->cl_state)) { |
8ed27d4f | 2165 | section = "bind conn to session"; |
a9e64442 WAA |
2166 | status = nfs4_bind_conn_to_session(clp); |
2167 | if (status < 0) | |
2168 | goto out_error; | |
bf674c82 | 2169 | continue; |
a9e64442 WAA |
2170 | } |
2171 | ||
5df904ae TM |
2172 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2173 | section = "check lease"; | |
2174 | status = nfs4_check_lease(clp); | |
2175 | if (status < 0) | |
2176 | goto out_error; | |
2177 | continue; | |
2178 | } | |
2179 | ||
b79a4a1b | 2180 | /* First recover reboot state... */ |
e345e88a | 2181 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2182 | section = "reclaim reboot"; |
591d71cb | 2183 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2184 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 2185 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2186 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 2187 | continue; |
b79a4a1b | 2188 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
2189 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
2190 | continue; | |
2191 | if (status < 0) | |
2192 | goto out_error; | |
02860014 TM |
2193 | } |
2194 | ||
b79a4a1b TM |
2195 | /* Now recover expired state... */ |
2196 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2197 | section = "reclaim nograce"; |
591d71cb | 2198 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2199 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 2200 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2201 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
2202 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
2203 | continue; | |
2204 | if (status < 0) | |
b79a4a1b | 2205 | goto out_error; |
1da177e4 | 2206 | } |
707fb4b3 | 2207 | |
5601a00d | 2208 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
2209 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
2210 | nfs_client_return_marked_delegations(clp); | |
2211 | continue; | |
2212 | } | |
e005e804 TM |
2213 | |
2214 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
2215 | /* Did we race with an attempt to give us more work? */ |
2216 | if (clp->cl_state == 0) | |
2217 | break; | |
2218 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
2219 | break; | |
47c2199b | 2220 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 2221 | return; |
1da177e4 | 2222 | out_error: |
8ed27d4f WAA |
2223 | if (strlen(section)) |
2224 | section_sep = ": "; | |
2225 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2226 | " with error %d\n", section_sep, section, | |
2227 | clp->cl_hostname, -status); | |
ffe5a830 | 2228 | ssleep(1); |
5601a00d | 2229 | nfs4_end_drain_session(clp); |
e005e804 TM |
2230 | nfs4_clear_state_manager_bit(clp); |
2231 | } | |
2232 | ||
2233 | static int nfs4_run_state_manager(void *ptr) | |
2234 | { | |
2235 | struct nfs_client *clp = ptr; | |
2236 | ||
2237 | allow_signal(SIGKILL); | |
2238 | nfs4_state_manager(clp); | |
2239 | nfs_put_client(clp); | |
2240 | module_put_and_exit(0); | |
2241 | return 0; | |
1da177e4 LT |
2242 | } |
2243 | ||
2244 | /* | |
2245 | * Local variables: | |
2246 | * c-basic-offset: 8 | |
2247 | * End: | |
2248 | */ |