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 | ||
62f288a0 | 231 | static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl) |
9dfdf404 | 232 | { |
774d5f14 | 233 | if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
961a828d | 234 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 235 | nfs41_wake_slot_table(tbl); |
961a828d | 236 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 237 | } |
9dfdf404 RL |
238 | } |
239 | ||
62f288a0 AA |
240 | static void nfs4_end_drain_session(struct nfs_client *clp) |
241 | { | |
242 | struct nfs4_session *ses = clp->cl_session; | |
243 | ||
244 | if (ses != NULL) { | |
245 | nfs4_end_drain_slot_table(&ses->bc_slot_table); | |
246 | nfs4_end_drain_slot_table(&ses->fc_slot_table); | |
247 | } | |
248 | } | |
249 | ||
5d63360d TM |
250 | /* |
251 | * Signal state manager thread if session fore channel is drained | |
252 | */ | |
774d5f14 | 253 | void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl) |
5d63360d | 254 | { |
774d5f14 | 255 | if (nfs4_slot_tbl_draining(tbl)) |
5d63360d TM |
256 | complete(&tbl->complete); |
257 | } | |
258 | ||
774d5f14 | 259 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 260 | { |
774d5f14 | 261 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 262 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 263 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 264 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 265 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 266 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
267 | } |
268 | spin_unlock(&tbl->slot_tbl_lock); | |
269 | return 0; | |
270 | } | |
271 | ||
42acd021 AA |
272 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
273 | { | |
274 | struct nfs4_session *ses = clp->cl_session; | |
275 | int ret = 0; | |
276 | ||
42acd021 | 277 | /* back channel */ |
774d5f14 | 278 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
279 | if (ret) |
280 | return ret; | |
281 | /* fore channel */ | |
774d5f14 | 282 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
283 | } |
284 | ||
bda197f5 TM |
285 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
286 | { | |
287 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
288 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
289 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
290 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
291 | nfs41_setup_state_renewal(clp); | |
292 | } | |
293 | ||
4d643d1d AA |
294 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
295 | { | |
296 | int status; | |
297 | ||
fd954ae1 TM |
298 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
299 | goto do_confirm; | |
38045412 | 300 | nfs4_begin_drain_session(clp); |
4d643d1d | 301 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
302 | if (status != 0) |
303 | goto out; | |
fd954ae1 TM |
304 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
305 | do_confirm: | |
848f5bda | 306 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
307 | if (status != 0) |
308 | goto out; | |
bda197f5 | 309 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
310 | nfs_mark_client_ready(clp, NFS_CS_READY); |
311 | out: | |
4d643d1d AA |
312 | return status; |
313 | } | |
314 | ||
05f4c350 CL |
315 | /** |
316 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
317 | * | |
318 | * @clp: nfs_client under test | |
319 | * @result: OUT: found nfs_client, or clp | |
320 | * @cred: credential to use for trunking test | |
321 | * | |
322 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
323 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
324 | * "result". | |
325 | * | |
326 | * Note: The returned client may not yet be marked ready. | |
327 | */ | |
328 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
329 | struct nfs_client **result, | |
330 | struct rpc_cred *cred) | |
331 | { | |
332 | int status; | |
333 | ||
334 | status = nfs4_proc_exchange_id(clp, cred); | |
335 | if (status != NFS4_OK) | |
336 | return status; | |
fd483570 | 337 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
05f4c350 CL |
338 | |
339 | return nfs41_walk_client_list(clp, result, cred); | |
340 | } | |
341 | ||
b4b82607 AA |
342 | struct rpc_cred *nfs4_get_exchange_id_cred(struct nfs_client *clp) |
343 | { | |
344 | struct rpc_cred *cred; | |
345 | ||
346 | spin_lock(&clp->cl_lock); | |
347 | cred = nfs4_get_machine_cred_locked(clp); | |
348 | spin_unlock(&clp->cl_lock); | |
349 | return cred; | |
350 | } | |
351 | ||
352 | #endif /* CONFIG_NFS_V4_1 */ | |
353 | ||
24d292b8 CL |
354 | static struct rpc_cred * |
355 | nfs4_get_setclientid_cred_server(struct nfs_server *server) | |
286d7d6a | 356 | { |
24d292b8 CL |
357 | struct nfs_client *clp = server->nfs_client; |
358 | struct rpc_cred *cred = NULL; | |
286d7d6a | 359 | struct nfs4_state_owner *sp; |
9f958ab8 | 360 | struct rb_node *pos; |
24d292b8 CL |
361 | |
362 | spin_lock(&clp->cl_lock); | |
363 | pos = rb_first(&server->state_owners); | |
364 | if (pos != NULL) { | |
365 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
366 | cred = get_rpccred(sp->so_cred); | |
367 | } | |
368 | spin_unlock(&clp->cl_lock); | |
369 | return cred; | |
370 | } | |
371 | ||
372 | /** | |
373 | * nfs4_get_setclientid_cred - Acquire credential for a setclientid operation | |
374 | * @clp: client state handle | |
375 | * | |
376 | * Returns an rpc_cred with reference count bumped, or NULL. | |
377 | */ | |
378 | struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) | |
379 | { | |
380 | struct nfs_server *server; | |
a2b2bb88 | 381 | struct rpc_cred *cred; |
286d7d6a | 382 | |
6dc9d57a TM |
383 | spin_lock(&clp->cl_lock); |
384 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 385 | spin_unlock(&clp->cl_lock); |
a2b2bb88 TM |
386 | if (cred != NULL) |
387 | goto out; | |
24d292b8 CL |
388 | |
389 | rcu_read_lock(); | |
390 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
391 | cred = nfs4_get_setclientid_cred_server(server); | |
392 | if (cred != NULL) | |
393 | break; | |
286d7d6a | 394 | } |
24d292b8 CL |
395 | rcu_read_unlock(); |
396 | ||
a2b2bb88 TM |
397 | out: |
398 | return cred; | |
286d7d6a TM |
399 | } |
400 | ||
1da177e4 | 401 | static struct nfs4_state_owner * |
24d292b8 | 402 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 403 | { |
24d292b8 | 404 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 405 | *parent = NULL; |
414adf14 | 406 | struct nfs4_state_owner *sp; |
1da177e4 | 407 | |
9f958ab8 TM |
408 | while (*p != NULL) { |
409 | parent = *p; | |
24d292b8 | 410 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
411 | |
412 | if (cred < sp->so_cred) | |
413 | p = &parent->rb_left; | |
414 | else if (cred > sp->so_cred) | |
415 | p = &parent->rb_right; | |
416 | else { | |
0aaaf5c4 CL |
417 | if (!list_empty(&sp->so_lru)) |
418 | list_del_init(&sp->so_lru); | |
9f958ab8 | 419 | atomic_inc(&sp->so_count); |
414adf14 | 420 | return sp; |
9f958ab8 | 421 | } |
1da177e4 | 422 | } |
414adf14 | 423 | return NULL; |
1da177e4 LT |
424 | } |
425 | ||
9f958ab8 | 426 | static struct nfs4_state_owner * |
24d292b8 | 427 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 428 | { |
24d292b8 CL |
429 | struct nfs_server *server = new->so_server; |
430 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
431 | *parent = NULL; |
432 | struct nfs4_state_owner *sp; | |
9157c31d | 433 | int err; |
9f958ab8 TM |
434 | |
435 | while (*p != NULL) { | |
436 | parent = *p; | |
24d292b8 | 437 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
438 | |
439 | if (new->so_cred < sp->so_cred) | |
440 | p = &parent->rb_left; | |
441 | else if (new->so_cred > sp->so_cred) | |
442 | p = &parent->rb_right; | |
443 | else { | |
0aaaf5c4 CL |
444 | if (!list_empty(&sp->so_lru)) |
445 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
446 | atomic_inc(&sp->so_count); |
447 | return sp; | |
448 | } | |
449 | } | |
48c22eb2 | 450 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
451 | if (err) |
452 | return ERR_PTR(err); | |
24d292b8 CL |
453 | rb_link_node(&new->so_server_node, parent, p); |
454 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
455 | return new; |
456 | } | |
457 | ||
458 | static void | |
24d292b8 | 459 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 460 | { |
24d292b8 CL |
461 | struct nfs_server *server = sp->so_server; |
462 | ||
463 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
464 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 465 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
466 | } |
467 | ||
7ba127ab TM |
468 | static void |
469 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
470 | { | |
95b72eb0 | 471 | sc->create_time = ktime_get(); |
7ba127ab TM |
472 | sc->flags = 0; |
473 | sc->counter = 0; | |
474 | spin_lock_init(&sc->lock); | |
475 | INIT_LIST_HEAD(&sc->list); | |
476 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
477 | } | |
478 | ||
479 | static void | |
480 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
481 | { | |
482 | rpc_destroy_wait_queue(&sc->wait); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
487 | * create a new state_owner. | |
488 | * | |
489 | */ | |
490 | static struct nfs4_state_owner * | |
d1e284d5 TM |
491 | nfs4_alloc_state_owner(struct nfs_server *server, |
492 | struct rpc_cred *cred, | |
493 | gfp_t gfp_flags) | |
1da177e4 LT |
494 | { |
495 | struct nfs4_state_owner *sp; | |
496 | ||
d1e284d5 | 497 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
498 | if (!sp) |
499 | return NULL; | |
d1e284d5 TM |
500 | sp->so_server = server; |
501 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 502 | spin_lock_init(&sp->so_lock); |
1da177e4 | 503 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 504 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 505 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 506 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 507 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 508 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
509 | return sp; |
510 | } | |
511 | ||
1d2e88e7 | 512 | static void |
1da177e4 LT |
513 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
514 | { | |
c77365c9 TM |
515 | struct rb_node *rb_node = &sp->so_server_node; |
516 | ||
517 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
518 | struct nfs_server *server = sp->so_server; |
519 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
520 | |
521 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
522 | if (!RB_EMPTY_NODE(rb_node)) { |
523 | rb_erase(rb_node, &server->state_owners); | |
524 | RB_CLEAR_NODE(rb_node); | |
525 | } | |
9f958ab8 TM |
526 | spin_unlock(&clp->cl_lock); |
527 | } | |
1da177e4 LT |
528 | } |
529 | ||
0aaaf5c4 CL |
530 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
531 | { | |
7ba127ab | 532 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
533 | put_rpccred(sp->so_cred); |
534 | kfree(sp); | |
535 | } | |
536 | ||
537 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
538 | { | |
539 | struct nfs_client *clp = server->nfs_client; | |
540 | struct nfs4_state_owner *sp, *tmp; | |
541 | unsigned long time_min, time_max; | |
542 | LIST_HEAD(doomed); | |
543 | ||
544 | spin_lock(&clp->cl_lock); | |
545 | time_max = jiffies; | |
546 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
547 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
548 | /* NB: LRU is sorted so that oldest is at the head */ | |
549 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
550 | break; | |
551 | list_move(&sp->so_lru, &doomed); | |
552 | nfs4_remove_state_owner_locked(sp); | |
553 | } | |
554 | spin_unlock(&clp->cl_lock); | |
555 | ||
556 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
557 | list_del(&sp->so_lru); | |
558 | nfs4_free_state_owner(sp); | |
559 | } | |
560 | } | |
561 | ||
24d292b8 CL |
562 | /** |
563 | * nfs4_get_state_owner - Look up a state owner given a credential | |
564 | * @server: nfs_server to search | |
565 | * @cred: RPC credential to match | |
566 | * | |
567 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
568 | */ | |
569 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
570 | struct rpc_cred *cred, |
571 | gfp_t gfp_flags) | |
1da177e4 | 572 | { |
7539bbab | 573 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
574 | struct nfs4_state_owner *sp, *new; |
575 | ||
1da177e4 | 576 | spin_lock(&clp->cl_lock); |
24d292b8 | 577 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 578 | spin_unlock(&clp->cl_lock); |
1da177e4 | 579 | if (sp != NULL) |
0aaaf5c4 | 580 | goto out; |
d1e284d5 | 581 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 582 | if (new == NULL) |
0aaaf5c4 | 583 | goto out; |
9157c31d TM |
584 | do { |
585 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
586 | break; | |
587 | spin_lock(&clp->cl_lock); | |
588 | sp = nfs4_insert_state_owner_locked(new); | |
589 | spin_unlock(&clp->cl_lock); | |
590 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
591 | if (sp != new) |
592 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
593 | out: |
594 | nfs4_gc_state_owners(server); | |
9f958ab8 | 595 | return sp; |
1da177e4 LT |
596 | } |
597 | ||
24d292b8 CL |
598 | /** |
599 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
600 | * @sp: state owner data to release | |
7bf97bc2 TM |
601 | * |
602 | * Note that we keep released state owners on an LRU | |
603 | * list. | |
604 | * This caches valid state owners so that they can be | |
605 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
606 | * It also pins the uniquifier of dropped state owners for | |
607 | * a while, to ensure that those state owner names are | |
608 | * never reused. | |
24d292b8 | 609 | */ |
1da177e4 LT |
610 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
611 | { | |
0aaaf5c4 CL |
612 | struct nfs_server *server = sp->so_server; |
613 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
614 | |
615 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
616 | return; | |
0aaaf5c4 | 617 | |
7bf97bc2 TM |
618 | sp->so_expires = jiffies; |
619 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
620 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
621 | } |
622 | ||
623 | /** | |
624 | * nfs4_purge_state_owners - Release all cached state owners | |
625 | * @server: nfs_server with cached state owners to release | |
626 | * | |
627 | * Called at umount time. Remaining state owners will be on | |
628 | * the LRU with ref count of zero. | |
629 | */ | |
630 | void nfs4_purge_state_owners(struct nfs_server *server) | |
631 | { | |
632 | struct nfs_client *clp = server->nfs_client; | |
633 | struct nfs4_state_owner *sp, *tmp; | |
634 | LIST_HEAD(doomed); | |
635 | ||
636 | spin_lock(&clp->cl_lock); | |
637 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
638 | list_move(&sp->so_lru, &doomed); | |
639 | nfs4_remove_state_owner_locked(sp); | |
640 | } | |
1da177e4 | 641 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
642 | |
643 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
644 | list_del(&sp->so_lru); | |
645 | nfs4_free_state_owner(sp); | |
646 | } | |
1da177e4 LT |
647 | } |
648 | ||
649 | static struct nfs4_state * | |
650 | nfs4_alloc_open_state(void) | |
651 | { | |
652 | struct nfs4_state *state; | |
653 | ||
8535b2be | 654 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
655 | if (!state) |
656 | return NULL; | |
1da177e4 LT |
657 | atomic_set(&state->count, 1); |
658 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 659 | spin_lock_init(&state->state_lock); |
8bda4e4c | 660 | seqlock_init(&state->seqlock); |
1da177e4 LT |
661 | return state; |
662 | } | |
663 | ||
4cecb76f | 664 | void |
dc0b027d | 665 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 666 | { |
dc0b027d | 667 | if (state->state == fmode) |
4cecb76f TM |
668 | return; |
669 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
670 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
671 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
672 | list_move(&state->open_states, &state->owner->so_states); |
673 | else | |
674 | list_move_tail(&state->open_states, &state->owner->so_states); | |
675 | } | |
dc0b027d | 676 | state->state = fmode; |
4cecb76f TM |
677 | } |
678 | ||
1da177e4 LT |
679 | static struct nfs4_state * |
680 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
681 | { | |
682 | struct nfs_inode *nfsi = NFS_I(inode); | |
683 | struct nfs4_state *state; | |
684 | ||
685 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 686 | if (state->owner != owner) |
1da177e4 | 687 | continue; |
5d422301 TM |
688 | if (!nfs4_valid_open_stateid(state)) |
689 | continue; | |
1c816efa | 690 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 691 | return state; |
1da177e4 LT |
692 | } |
693 | return NULL; | |
694 | } | |
695 | ||
1da177e4 LT |
696 | static void |
697 | nfs4_free_open_state(struct nfs4_state *state) | |
698 | { | |
699 | kfree(state); | |
700 | } | |
701 | ||
702 | struct nfs4_state * | |
703 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
704 | { | |
705 | struct nfs4_state *state, *new; | |
706 | struct nfs_inode *nfsi = NFS_I(inode); | |
707 | ||
708 | spin_lock(&inode->i_lock); | |
709 | state = __nfs4_find_state_byowner(inode, owner); | |
710 | spin_unlock(&inode->i_lock); | |
711 | if (state) | |
712 | goto out; | |
713 | new = nfs4_alloc_open_state(); | |
ec073428 | 714 | spin_lock(&owner->so_lock); |
1da177e4 LT |
715 | spin_lock(&inode->i_lock); |
716 | state = __nfs4_find_state_byowner(inode, owner); | |
717 | if (state == NULL && new != NULL) { | |
718 | state = new; | |
1da177e4 LT |
719 | state->owner = owner; |
720 | atomic_inc(&owner->so_count); | |
721 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
722 | ihold(inode); |
723 | state->inode = inode; | |
1da177e4 | 724 | spin_unlock(&inode->i_lock); |
ec073428 TM |
725 | /* Note: The reclaim code dictates that we add stateless |
726 | * and read-only stateids to the end of the list */ | |
727 | list_add_tail(&state->open_states, &owner->so_states); | |
728 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
729 | } else { |
730 | spin_unlock(&inode->i_lock); | |
ec073428 | 731 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
732 | if (new) |
733 | nfs4_free_open_state(new); | |
734 | } | |
735 | out: | |
736 | return state; | |
737 | } | |
738 | ||
1da177e4 LT |
739 | void nfs4_put_open_state(struct nfs4_state *state) |
740 | { | |
741 | struct inode *inode = state->inode; | |
742 | struct nfs4_state_owner *owner = state->owner; | |
743 | ||
ec073428 | 744 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 745 | return; |
ec073428 | 746 | spin_lock(&inode->i_lock); |
ba683031 | 747 | list_del(&state->inode_states); |
1da177e4 | 748 | list_del(&state->open_states); |
ec073428 TM |
749 | spin_unlock(&inode->i_lock); |
750 | spin_unlock(&owner->so_lock); | |
1da177e4 | 751 | iput(inode); |
1da177e4 LT |
752 | nfs4_free_open_state(state); |
753 | nfs4_put_state_owner(owner); | |
754 | } | |
755 | ||
756 | /* | |
83c9d41e | 757 | * Close the current file. |
1da177e4 | 758 | */ |
643168c2 | 759 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 760 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 761 | { |
1da177e4 | 762 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 763 | int call_close = 0; |
dc0b027d | 764 | fmode_t newstate; |
1da177e4 LT |
765 | |
766 | atomic_inc(&owner->so_count); | |
1da177e4 | 767 | /* Protect against nfs4_find_state() */ |
ec073428 | 768 | spin_lock(&owner->so_lock); |
dc0b027d | 769 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
770 | case FMODE_READ: |
771 | state->n_rdonly--; | |
772 | break; | |
773 | case FMODE_WRITE: | |
774 | state->n_wronly--; | |
775 | break; | |
776 | case FMODE_READ|FMODE_WRITE: | |
777 | state->n_rdwr--; | |
778 | } | |
003707c7 | 779 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 780 | if (state->n_rdwr == 0) { |
003707c7 | 781 | if (state->n_rdonly == 0) { |
e7616923 | 782 | newstate &= ~FMODE_READ; |
003707c7 TM |
783 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
784 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
785 | } | |
786 | if (state->n_wronly == 0) { | |
e7616923 | 787 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
788 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
789 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
790 | } | |
791 | if (newstate == 0) | |
792 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 793 | } |
003707c7 | 794 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 795 | spin_unlock(&owner->so_lock); |
4cecb76f | 796 | |
003707c7 | 797 | if (!call_close) { |
b39e625b TM |
798 | nfs4_put_open_state(state); |
799 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
800 | } else |
801 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
802 | } |
803 | ||
643168c2 | 804 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 805 | { |
643168c2 | 806 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
807 | } |
808 | ||
643168c2 | 809 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 810 | { |
643168c2 | 811 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
812 | } |
813 | ||
814 | /* | |
815 | * Search the state->lock_states for an existing lock_owner | |
816 | * that is compatible with current->files | |
817 | */ | |
818 | static struct nfs4_lock_state * | |
77041ed9 | 819 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
820 | { |
821 | struct nfs4_lock_state *pos; | |
822 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 823 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 824 | continue; |
77041ed9 TM |
825 | switch (pos->ls_owner.lo_type) { |
826 | case NFS4_POSIX_LOCK_TYPE: | |
827 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
828 | continue; | |
829 | break; | |
830 | case NFS4_FLOCK_LOCK_TYPE: | |
831 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
832 | continue; | |
833 | } | |
1da177e4 LT |
834 | atomic_inc(&pos->ls_count); |
835 | return pos; | |
836 | } | |
837 | return NULL; | |
838 | } | |
839 | ||
1da177e4 LT |
840 | /* |
841 | * Return a compatible lock_state. If no initialized lock_state structure | |
842 | * exists, return an uninitialized one. | |
843 | * | |
1da177e4 | 844 | */ |
77041ed9 | 845 | 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 |
846 | { |
847 | struct nfs4_lock_state *lsp; | |
24d292b8 | 848 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 849 | |
8535b2be | 850 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
851 | if (lsp == NULL) |
852 | return NULL; | |
7ba127ab | 853 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 854 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 855 | lsp->ls_state = state; |
77041ed9 TM |
856 | lsp->ls_owner.lo_type = type; |
857 | switch (lsp->ls_owner.lo_type) { | |
858 | case NFS4_FLOCK_LOCK_TYPE: | |
859 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
860 | break; | |
861 | case NFS4_POSIX_LOCK_TYPE: | |
862 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
863 | break; | |
864 | default: | |
d2d7ce28 | 865 | goto out_free; |
77041ed9 | 866 | } |
48c22eb2 TM |
867 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
868 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 869 | goto out_free; |
8d0a8a9d | 870 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 871 | return lsp; |
d2d7ce28 TM |
872 | out_free: |
873 | kfree(lsp); | |
874 | return NULL; | |
1da177e4 LT |
875 | } |
876 | ||
5ae67c4f | 877 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 878 | { |
48c22eb2 | 879 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 880 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
881 | kfree(lsp); |
882 | } | |
883 | ||
1da177e4 LT |
884 | /* |
885 | * Return a compatible lock_state. If no initialized lock_state structure | |
886 | * exists, return an uninitialized one. | |
887 | * | |
1da177e4 | 888 | */ |
77041ed9 | 889 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 890 | { |
8d0a8a9d | 891 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 892 | |
8d0a8a9d TM |
893 | for(;;) { |
894 | spin_lock(&state->state_lock); | |
77041ed9 | 895 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
896 | if (lsp != NULL) |
897 | break; | |
898 | if (new != NULL) { | |
8d0a8a9d TM |
899 | list_add(&new->ls_locks, &state->lock_states); |
900 | set_bit(LK_STATE_IN_USE, &state->flags); | |
901 | lsp = new; | |
902 | new = NULL; | |
903 | break; | |
904 | } | |
905 | spin_unlock(&state->state_lock); | |
77041ed9 | 906 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
907 | if (new == NULL) |
908 | return NULL; | |
909 | } | |
910 | spin_unlock(&state->state_lock); | |
9f958ab8 | 911 | if (new != NULL) |
5ae67c4f | 912 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
913 | return lsp; |
914 | } | |
915 | ||
916 | /* | |
8d0a8a9d TM |
917 | * Release reference to lock_state, and free it if we see that |
918 | * it is no longer in use | |
1da177e4 | 919 | */ |
faf5f49c | 920 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 921 | { |
c8b2d0bf | 922 | struct nfs_server *server; |
8d0a8a9d | 923 | struct nfs4_state *state; |
1da177e4 | 924 | |
8d0a8a9d TM |
925 | if (lsp == NULL) |
926 | return; | |
927 | state = lsp->ls_state; | |
928 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
929 | return; | |
930 | list_del(&lsp->ls_locks); | |
931 | if (list_empty(&state->lock_states)) | |
932 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
933 | spin_unlock(&state->state_lock); | |
c8b2d0bf | 934 | server = state->owner->so_server; |
795a88c9 | 935 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
c8b2d0bf TM |
936 | struct nfs_client *clp = server->nfs_client; |
937 | ||
938 | clp->cl_mvops->free_lock_state(server, lsp); | |
939 | } else | |
940 | nfs4_free_lock_state(server, lsp); | |
1da177e4 LT |
941 | } |
942 | ||
8d0a8a9d | 943 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 944 | { |
8d0a8a9d | 945 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 946 | |
8d0a8a9d TM |
947 | dst->fl_u.nfs4_fl.owner = lsp; |
948 | atomic_inc(&lsp->ls_count); | |
949 | } | |
1da177e4 | 950 | |
8d0a8a9d | 951 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 952 | { |
8d0a8a9d | 953 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
954 | } |
955 | ||
6aed6285 | 956 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
957 | .fl_copy_lock = nfs4_fl_copy_lock, |
958 | .fl_release_private = nfs4_fl_release_lock, | |
959 | }; | |
960 | ||
961 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 962 | { |
8d0a8a9d TM |
963 | struct nfs4_lock_state *lsp; |
964 | ||
965 | if (fl->fl_ops != NULL) | |
966 | return 0; | |
77041ed9 TM |
967 | if (fl->fl_flags & FL_POSIX) |
968 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
969 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
970 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
971 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
972 | else |
973 | return -EINVAL; | |
8d0a8a9d TM |
974 | if (lsp == NULL) |
975 | return -ENOMEM; | |
976 | fl->fl_u.nfs4_fl.owner = lsp; | |
977 | fl->fl_ops = &nfs4_fl_lock_ops; | |
978 | return 0; | |
1da177e4 LT |
979 | } |
980 | ||
5521abfd TM |
981 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
982 | struct nfs4_state *state, | |
2a369153 | 983 | const struct nfs_lockowner *lockowner) |
1da177e4 | 984 | { |
8d0a8a9d | 985 | struct nfs4_lock_state *lsp; |
2a369153 TM |
986 | fl_owner_t fl_owner; |
987 | pid_t fl_pid; | |
5521abfd | 988 | int ret = -ENOENT; |
1da177e4 | 989 | |
2a369153 TM |
990 | |
991 | if (lockowner == NULL) | |
992 | goto out; | |
993 | ||
8d0a8a9d | 994 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 995 | goto out; |
1da177e4 | 996 | |
2a369153 TM |
997 | fl_owner = lockowner->l_owner; |
998 | fl_pid = lockowner->l_pid; | |
8d0a8a9d | 999 | spin_lock(&state->state_lock); |
77041ed9 | 1000 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
795a88c9 | 1001 | if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
f597c537 | 1002 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd TM |
1003 | ret = 0; |
1004 | smp_rmb(); | |
1005 | if (!list_empty(&lsp->ls_seqid.list)) | |
1006 | ret = -EWOULDBLOCK; | |
4fc8796d | 1007 | } |
8d0a8a9d | 1008 | spin_unlock(&state->state_lock); |
1da177e4 | 1009 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
1010 | out: |
1011 | return ret; | |
1012 | } | |
1013 | ||
5521abfd | 1014 | static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 1015 | { |
92b40e93 | 1016 | const nfs4_stateid *src; |
5521abfd | 1017 | int ret; |
4fc8796d TM |
1018 | int seq; |
1019 | ||
1020 | do { | |
92b40e93 | 1021 | src = &zero_stateid; |
4fc8796d | 1022 | seq = read_seqbegin(&state->seqlock); |
92b40e93 TM |
1023 | if (test_bit(NFS_OPEN_STATE, &state->flags)) |
1024 | src = &state->open_stateid; | |
1025 | nfs4_stateid_copy(dst, src); | |
5521abfd TM |
1026 | ret = 0; |
1027 | smp_rmb(); | |
1028 | if (!list_empty(&state->owner->so_seqid.list)) | |
1029 | ret = -EWOULDBLOCK; | |
4fc8796d | 1030 | } while (read_seqretry(&state->seqlock, seq)); |
5521abfd | 1031 | return ret; |
4fc8796d TM |
1032 | } |
1033 | ||
1034 | /* | |
1035 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1036 | * requests. | |
1037 | */ | |
5521abfd | 1038 | int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
2a369153 | 1039 | fmode_t fmode, const struct nfs_lockowner *lockowner) |
4fc8796d | 1040 | { |
5521abfd | 1041 | int ret = 0; |
4fc8796d | 1042 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) |
5521abfd TM |
1043 | goto out; |
1044 | ret = nfs4_copy_lock_stateid(dst, state, lockowner); | |
1045 | if (ret != -ENOENT) | |
1046 | goto out; | |
1047 | ret = nfs4_copy_open_stateid(dst, state); | |
1048 | out: | |
3b66486c TM |
1049 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1050 | dst->seqid = 0; | |
5521abfd | 1051 | return ret; |
1da177e4 LT |
1052 | } |
1053 | ||
8535b2be | 1054 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1055 | { |
cee54fc9 TM |
1056 | struct nfs_seqid *new; |
1057 | ||
8535b2be | 1058 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
1059 | if (new != NULL) { |
1060 | new->sequence = counter; | |
2f74c0a0 | 1061 | INIT_LIST_HEAD(&new->list); |
4601df20 | 1062 | new->task = NULL; |
cee54fc9 TM |
1063 | } |
1064 | return new; | |
1065 | } | |
1066 | ||
72211dbe | 1067 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1068 | { |
4601df20 | 1069 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1070 | |
4601df20 TM |
1071 | if (list_empty(&seqid->list)) |
1072 | return; | |
1073 | sequence = seqid->sequence; | |
1074 | spin_lock(&sequence->lock); | |
1075 | list_del_init(&seqid->list); | |
1076 | if (!list_empty(&sequence->list)) { | |
1077 | struct nfs_seqid *next; | |
1078 | ||
1079 | next = list_first_entry(&sequence->list, | |
1080 | struct nfs_seqid, list); | |
1081 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1082 | } |
4601df20 | 1083 | spin_unlock(&sequence->lock); |
72211dbe TM |
1084 | } |
1085 | ||
1086 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1087 | { | |
1088 | nfs_release_seqid(seqid); | |
cee54fc9 | 1089 | kfree(seqid); |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | /* | |
cee54fc9 TM |
1093 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1094 | * failed with a seqid incrementing error - | |
1095 | * see comments nfs_fs.h:seqid_mutating_error() | |
1096 | */ | |
88d90939 | 1097 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1098 | { |
1099 | switch (status) { | |
1100 | case 0: | |
1101 | break; | |
1102 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1103 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1104 | return; | |
9a3ba432 | 1105 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1106 | " sequence-id error on an" |
1107 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1108 | seqid->sequence); |
cee54fc9 TM |
1109 | case -NFS4ERR_STALE_CLIENTID: |
1110 | case -NFS4ERR_STALE_STATEID: | |
1111 | case -NFS4ERR_BAD_STATEID: | |
1112 | case -NFS4ERR_BADXDR: | |
1113 | case -NFS4ERR_RESOURCE: | |
1114 | case -NFS4ERR_NOFILEHANDLE: | |
1115 | /* Non-seqid mutating errors */ | |
1116 | return; | |
1117 | }; | |
1118 | /* | |
1119 | * Note: no locking needed as we are guaranteed to be first | |
1120 | * on the sequence list | |
1121 | */ | |
1122 | seqid->sequence->counter++; | |
1123 | } | |
1124 | ||
1125 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1126 | { | |
34dc1ad7 BH |
1127 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1128 | struct nfs4_state_owner, so_seqid); | |
1129 | struct nfs_server *server = sp->so_server; | |
1130 | ||
1131 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1132 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1133 | if (!nfs4_has_session(server->nfs_client)) |
1134 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1135 | } |
1136 | ||
1137 | /* | |
cee54fc9 TM |
1138 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1139 | * failed with a seqid incrementing error - | |
1140 | * see comments nfs_fs.h:seqid_mutating_error() | |
1141 | */ | |
1142 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1143 | { | |
88d90939 | 1144 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1145 | } |
1146 | ||
1147 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1148 | { | |
7ba127ab | 1149 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1150 | int status = 0; |
1151 | ||
1152 | spin_lock(&sequence->lock); | |
4601df20 | 1153 | seqid->task = task; |
2f74c0a0 TM |
1154 | if (list_empty(&seqid->list)) |
1155 | list_add_tail(&seqid->list, &sequence->list); | |
1156 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1157 | goto unlock; | |
5d00837b | 1158 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1159 | status = -EAGAIN; |
1160 | unlock: | |
cee54fc9 TM |
1161 | spin_unlock(&sequence->lock); |
1162 | return status; | |
1da177e4 LT |
1163 | } |
1164 | ||
e005e804 | 1165 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1166 | |
e005e804 | 1167 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1168 | { |
1169 | smp_mb__before_clear_bit(); | |
e005e804 | 1170 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1171 | smp_mb__after_clear_bit(); |
e005e804 | 1172 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1173 | rpc_wake_up(&clp->cl_rpcwaitq); |
1174 | } | |
1175 | ||
1da177e4 | 1176 | /* |
e005e804 | 1177 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1178 | */ |
b0d3ded1 | 1179 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1180 | { |
5043e900 | 1181 | struct task_struct *task; |
2446ab60 | 1182 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1183 | |
e005e804 TM |
1184 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1185 | return; | |
5043e900 TM |
1186 | __module_get(THIS_MODULE); |
1187 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1188 | |
1189 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1190 | * manager is the only thread that ever changes the rpc_xprt | |
1191 | * after it's initialized. At this point, we're single threaded. */ | |
1192 | rcu_read_lock(); | |
1193 | snprintf(buf, sizeof(buf), "%s-manager", | |
1194 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1195 | rcu_read_unlock(); | |
f170168b | 1196 | task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
2446ab60 TM |
1197 | if (IS_ERR(task)) { |
1198 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1199 | __func__, PTR_ERR(task)); | |
1200 | nfs4_clear_state_manager_bit(clp); | |
1201 | nfs_put_client(clp); | |
1202 | module_put(THIS_MODULE); | |
1203 | } | |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | /* | |
0400a6b0 | 1207 | * Schedule a lease recovery attempt |
1da177e4 | 1208 | */ |
0400a6b0 | 1209 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1210 | { |
1211 | if (!clp) | |
1212 | return; | |
e598d843 TM |
1213 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1214 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1215 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1216 | clp->cl_hostname); | |
e005e804 | 1217 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1218 | } |
9cb81968 | 1219 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1220 | |
33021279 TM |
1221 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1222 | { | |
1223 | int res; | |
1224 | ||
1225 | might_sleep(); | |
1226 | ||
1227 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, | |
1228 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1229 | if (res) | |
1230 | return res; | |
1231 | ||
1232 | if (clp->cl_cons_state < 0) | |
1233 | return clp->cl_cons_state; | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1238 | { | |
1239 | unsigned int loop; | |
1240 | int ret; | |
1241 | ||
1242 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1243 | ret = nfs4_wait_clnt_recover(clp); | |
1244 | if (ret != 0) | |
1245 | break; | |
1246 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1247 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1248 | break; | |
1249 | nfs4_schedule_state_manager(clp); | |
1250 | ret = -EIO; | |
1251 | } | |
1252 | return ret; | |
1253 | } | |
1254 | ||
ad1e3968 TM |
1255 | /* |
1256 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1257 | * @clp: client to process | |
1258 | * | |
1259 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1260 | * resend of the SETCLIENTID and hence re-establish the | |
1261 | * callback channel. Then return all existing delegations. | |
1262 | */ | |
1263 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1264 | { | |
1265 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1266 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1267 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1268 | clp->cl_hostname); | |
ad1e3968 TM |
1269 | } |
1270 | ||
042b60be TM |
1271 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1272 | { | |
ad1e3968 | 1273 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1274 | nfs4_schedule_state_manager(clp); |
1275 | } | |
1276 | ||
f9feab1e | 1277 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1278 | { |
1279 | ||
1280 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1281 | /* Don't recover state that expired before the reboot */ | |
1282 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1283 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1284 | return 0; | |
1285 | } | |
7eff03ae | 1286 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1287 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1288 | return 1; | |
1289 | } | |
1290 | ||
f9feab1e | 1291 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1292 | { |
1293 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1294 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1295 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1296 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1297 | return 1; | |
1298 | } | |
1299 | ||
5d422301 | 1300 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1301 | { |
1302 | struct nfs_client *clp = server->nfs_client; | |
1303 | ||
5d422301 TM |
1304 | if (!nfs4_valid_open_stateid(state)) |
1305 | return -EBADF; | |
0400a6b0 | 1306 | nfs4_state_mark_reclaim_nograce(clp, state); |
cc0a9843 TM |
1307 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1308 | clp->cl_hostname); | |
0400a6b0 | 1309 | nfs4_schedule_state_manager(clp); |
5d422301 | 1310 | return 0; |
0400a6b0 | 1311 | } |
9cb81968 | 1312 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1313 | |
a1d0b5ee TM |
1314 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1315 | const nfs4_stateid *stateid) | |
1316 | { | |
1317 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1318 | struct nfs_inode *nfsi = NFS_I(inode); | |
1319 | struct nfs_open_context *ctx; | |
1320 | struct nfs4_state *state; | |
1321 | bool found = false; | |
1322 | ||
1323 | spin_lock(&inode->i_lock); | |
1324 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1325 | state = ctx->state; | |
1326 | if (state == NULL) | |
1327 | continue; | |
1328 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1329 | continue; | |
f597c537 | 1330 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1331 | continue; |
1332 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1333 | found = true; | |
1334 | } | |
1335 | spin_unlock(&inode->i_lock); | |
1336 | if (found) | |
1337 | nfs4_schedule_state_manager(clp); | |
1338 | } | |
1339 | ||
c58c8441 TM |
1340 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1341 | { | |
1342 | struct inode *inode = state->inode; | |
1343 | struct nfs_inode *nfsi = NFS_I(inode); | |
1344 | struct nfs_open_context *ctx; | |
1345 | ||
1346 | spin_lock(&inode->i_lock); | |
1347 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1348 | if (ctx->state != state) | |
1349 | continue; | |
1350 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1351 | } | |
1352 | spin_unlock(&inode->i_lock); | |
1353 | } | |
1354 | ||
5d422301 TM |
1355 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1356 | { | |
1357 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1358 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1359 | } |
1360 | ||
a1d0b5ee | 1361 | |
02860014 | 1362 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1363 | { |
1364 | struct inode *inode = state->inode; | |
19e03c57 | 1365 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1366 | struct file_lock *fl; |
1367 | int status = 0; | |
1368 | ||
3f09df70 TM |
1369 | if (inode->i_flock == NULL) |
1370 | return 0; | |
1371 | ||
1372 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1373 | down_write(&nfsi->rwsem); |
3f09df70 | 1374 | /* Protect inode->i_flock using the BKL */ |
1c8c601a | 1375 | spin_lock(&inode->i_lock); |
90dc7d27 | 1376 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1377 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1378 | continue; |
cd3758e3 | 1379 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1380 | continue; |
1c8c601a | 1381 | spin_unlock(&inode->i_lock); |
1da177e4 | 1382 | status = ops->recover_lock(state, fl); |
1da177e4 | 1383 | switch (status) { |
965b5d67 TM |
1384 | case 0: |
1385 | break; | |
1386 | case -ESTALE: | |
1387 | case -NFS4ERR_ADMIN_REVOKED: | |
1388 | case -NFS4ERR_STALE_STATEID: | |
1389 | case -NFS4ERR_BAD_STATEID: | |
1390 | case -NFS4ERR_EXPIRED: | |
1391 | case -NFS4ERR_NO_GRACE: | |
1392 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1393 | case -NFS4ERR_BADSESSION: |
1394 | case -NFS4ERR_BADSLOT: | |
1395 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1396 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1397 | goto out; |
1da177e4 | 1398 | default: |
a030889a WAA |
1399 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1400 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1401 | case -ENOMEM: |
1402 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1403 | case -NFS4ERR_RECLAIM_BAD: |
1404 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1405 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1406 | status = 0; |
1da177e4 | 1407 | } |
1c8c601a | 1408 | spin_lock(&inode->i_lock); |
1da177e4 | 1409 | } |
1c8c601a | 1410 | spin_unlock(&inode->i_lock); |
965b5d67 | 1411 | out: |
19e03c57 | 1412 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1413 | return status; |
1414 | } | |
1415 | ||
02860014 | 1416 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1417 | { |
1418 | struct nfs4_state *state; | |
1419 | struct nfs4_lock_state *lock; | |
1420 | int status = 0; | |
1421 | ||
1422 | /* Note: we rely on the sp->so_states list being ordered | |
1423 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1424 | * states first. | |
1425 | * This is needed to ensure that the server won't give us any | |
1426 | * read delegations that we have to return if, say, we are | |
1427 | * recovering after a network partition or a reboot from a | |
1428 | * server that doesn't support a grace period. | |
1429 | */ | |
fe1d8195 | 1430 | spin_lock(&sp->so_lock); |
c137afab TM |
1431 | write_seqcount_begin(&sp->so_reclaim_seqcount); |
1432 | restart: | |
1da177e4 | 1433 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1434 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1435 | continue; | |
5d422301 TM |
1436 | if (!nfs4_valid_open_stateid(state)) |
1437 | continue; | |
1da177e4 LT |
1438 | if (state->state == 0) |
1439 | continue; | |
fe1d8195 TM |
1440 | atomic_inc(&state->count); |
1441 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1442 | status = ops->recover_open(sp, state); |
1da177e4 | 1443 | if (status >= 0) { |
02860014 TM |
1444 | status = nfs4_reclaim_locks(state, ops); |
1445 | if (status >= 0) { | |
4b44b40e | 1446 | spin_lock(&state->state_lock); |
02860014 | 1447 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
795a88c9 | 1448 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
96dcadc2 WD |
1449 | pr_warn_ratelimited("NFS: " |
1450 | "%s: Lock reclaim " | |
a030889a | 1451 | "failed!\n", __func__); |
02860014 | 1452 | } |
4b44b40e | 1453 | spin_unlock(&state->state_lock); |
fe1d8195 | 1454 | nfs4_put_open_state(state); |
c137afab | 1455 | spin_lock(&sp->so_lock); |
fe1d8195 | 1456 | goto restart; |
1da177e4 | 1457 | } |
1da177e4 LT |
1458 | } |
1459 | switch (status) { | |
1460 | default: | |
a030889a WAA |
1461 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1462 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1463 | case -ENOENT: |
965b5d67 | 1464 | case -ENOMEM: |
b79a4a1b | 1465 | case -ESTALE: |
1da177e4 LT |
1466 | /* |
1467 | * Open state on this file cannot be recovered | |
1468 | * All we can do is revert to using the zero stateid. | |
1469 | */ | |
5d422301 | 1470 | nfs4_state_mark_recovery_failed(state, status); |
1da177e4 | 1471 | break; |
91876b13 TM |
1472 | case -EAGAIN: |
1473 | ssleep(1); | |
965b5d67 TM |
1474 | case -NFS4ERR_ADMIN_REVOKED: |
1475 | case -NFS4ERR_STALE_STATEID: | |
1476 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1477 | case -NFS4ERR_RECLAIM_BAD: |
1478 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1479 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1480 | break; |
1da177e4 LT |
1481 | case -NFS4ERR_EXPIRED: |
1482 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1483 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1484 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1485 | case -NFS4ERR_BADSESSION: |
1486 | case -NFS4ERR_BADSLOT: | |
1487 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1488 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1489 | goto out_err; |
1490 | } | |
fe1d8195 | 1491 | nfs4_put_open_state(state); |
c137afab | 1492 | spin_lock(&sp->so_lock); |
fe1d8195 | 1493 | goto restart; |
1da177e4 | 1494 | } |
c137afab | 1495 | write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1496 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1497 | return 0; |
1498 | out_err: | |
fe1d8195 | 1499 | nfs4_put_open_state(state); |
c137afab TM |
1500 | spin_lock(&sp->so_lock); |
1501 | write_seqcount_end(&sp->so_reclaim_seqcount); | |
1502 | spin_unlock(&sp->so_lock); | |
1da177e4 LT |
1503 | return status; |
1504 | } | |
1505 | ||
b79a4a1b TM |
1506 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1507 | { | |
1508 | struct nfs4_lock_state *lock; | |
1509 | ||
1510 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1511 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1512 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1513 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1514 | spin_lock(&state->state_lock); |
b79a4a1b | 1515 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1516 | lock->ls_seqid.flags = 0; |
795a88c9 | 1517 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1518 | } |
4b44b40e | 1519 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1520 | } |
1521 | ||
24d292b8 CL |
1522 | static void nfs4_reset_seqids(struct nfs_server *server, |
1523 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1524 | { |
24d292b8 | 1525 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1526 | struct nfs4_state_owner *sp; |
9f958ab8 | 1527 | struct rb_node *pos; |
cee54fc9 | 1528 | struct nfs4_state *state; |
cee54fc9 | 1529 | |
24d292b8 CL |
1530 | spin_lock(&clp->cl_lock); |
1531 | for (pos = rb_first(&server->state_owners); | |
1532 | pos != NULL; | |
1533 | pos = rb_next(pos)) { | |
1534 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1535 | sp->so_seqid.flags = 0; |
ec073428 | 1536 | spin_lock(&sp->so_lock); |
cee54fc9 | 1537 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1538 | if (mark_reclaim(clp, state)) |
1539 | nfs4_clear_open_state(state); | |
cee54fc9 | 1540 | } |
ec073428 | 1541 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1542 | } |
24d292b8 CL |
1543 | spin_unlock(&clp->cl_lock); |
1544 | } | |
1545 | ||
1546 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1547 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1548 | { | |
1549 | struct nfs_server *server; | |
1550 | ||
1551 | rcu_read_lock(); | |
1552 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1553 | nfs4_reset_seqids(server, mark_reclaim); | |
1554 | rcu_read_unlock(); | |
cee54fc9 TM |
1555 | } |
1556 | ||
b79a4a1b TM |
1557 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1558 | { | |
1559 | /* Mark all delegations for reclaim */ | |
1560 | nfs_delegation_mark_reclaim(clp); | |
1561 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1562 | } | |
1563 | ||
fce5c838 | 1564 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 TM |
1565 | const struct nfs4_state_recovery_ops *ops, |
1566 | struct rpc_cred *cred) | |
fce5c838 RL |
1567 | { |
1568 | /* Notify the server we're done reclaiming our state */ | |
1569 | if (ops->reclaim_complete) | |
965e9c23 | 1570 | (void)ops->reclaim_complete(clp, cred); |
fce5c838 RL |
1571 | } |
1572 | ||
24d292b8 | 1573 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1574 | { |
24d292b8 | 1575 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1576 | struct nfs4_state_owner *sp; |
1577 | struct rb_node *pos; | |
1578 | struct nfs4_state *state; | |
1579 | ||
24d292b8 CL |
1580 | spin_lock(&clp->cl_lock); |
1581 | for (pos = rb_first(&server->state_owners); | |
1582 | pos != NULL; | |
1583 | pos = rb_next(pos)) { | |
1584 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1585 | spin_lock(&sp->so_lock); |
1586 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1587 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1588 | &state->flags)) | |
b79a4a1b TM |
1589 | continue; |
1590 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1591 | } | |
1592 | spin_unlock(&sp->so_lock); | |
1593 | } | |
24d292b8 CL |
1594 | spin_unlock(&clp->cl_lock); |
1595 | } | |
1596 | ||
1597 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1598 | { | |
1599 | struct nfs_server *server; | |
1600 | ||
1601 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1602 | return 0; | |
1603 | ||
1604 | rcu_read_lock(); | |
1605 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1606 | nfs4_clear_reclaim_server(server); | |
1607 | rcu_read_unlock(); | |
b79a4a1b TM |
1608 | |
1609 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1610 | return 1; |
1611 | } | |
1612 | ||
1613 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1614 | { | |
965e9c23 TM |
1615 | const struct nfs4_state_recovery_ops *ops; |
1616 | struct rpc_cred *cred; | |
1617 | ||
6eaa6149 TM |
1618 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1619 | return; | |
965e9c23 TM |
1620 | ops = clp->cl_mvops->reboot_recovery_ops; |
1621 | cred = ops->get_clid_cred(clp); | |
1622 | nfs4_reclaim_complete(clp, ops, cred); | |
1623 | put_rpccred(cred); | |
b79a4a1b TM |
1624 | } |
1625 | ||
1626 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1627 | { | |
1628 | nfs_delegation_mark_reclaim(clp); | |
1629 | nfs_delegation_reap_unclaimed(clp); | |
1630 | } | |
1631 | ||
1632 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1633 | { | |
1634 | nfs_delegation_clear_all(clp); | |
1635 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1636 | } | |
1637 | ||
4f7cdf18 | 1638 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1639 | { |
1640 | switch (error) { | |
4f38e4aa TM |
1641 | case 0: |
1642 | break; | |
e598d843 | 1643 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1644 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1645 | break; |
c8b7ae3d TM |
1646 | case -NFS4ERR_NO_GRACE: |
1647 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1648 | break; |
e598d843 TM |
1649 | case -NFS4ERR_STALE_CLIENTID: |
1650 | case -NFS4ERR_LEASE_MOVED: | |
1651 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1652 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1653 | nfs4_state_start_reclaim_reboot(clp); |
1654 | break; | |
1655 | case -NFS4ERR_EXPIRED: | |
1656 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1657 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1658 | break; |
c3fad1b1 AA |
1659 | case -NFS4ERR_BADSESSION: |
1660 | case -NFS4ERR_BADSLOT: | |
1661 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1662 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1663 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1664 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1665 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1666 | /* Zero session reset errors */ |
4f38e4aa | 1667 | break; |
7c5d7256 TM |
1668 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1669 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1670 | break; | |
4f38e4aa | 1671 | default: |
cc0a9843 TM |
1672 | dprintk("%s: failed to handle error %d for server %s\n", |
1673 | __func__, error, clp->cl_hostname); | |
4f38e4aa | 1674 | return error; |
e598d843 | 1675 | } |
cc0a9843 TM |
1676 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1677 | clp->cl_hostname); | |
4f38e4aa | 1678 | return 0; |
e598d843 TM |
1679 | } |
1680 | ||
02860014 | 1681 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1682 | { |
24d292b8 CL |
1683 | struct nfs4_state_owner *sp; |
1684 | struct nfs_server *server; | |
9f958ab8 | 1685 | struct rb_node *pos; |
1da177e4 LT |
1686 | int status = 0; |
1687 | ||
7eff03ae | 1688 | restart: |
24d292b8 CL |
1689 | rcu_read_lock(); |
1690 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1691 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1692 | spin_lock(&clp->cl_lock); |
1693 | for (pos = rb_first(&server->state_owners); | |
1694 | pos != NULL; | |
1695 | pos = rb_next(pos)) { | |
1696 | sp = rb_entry(pos, | |
1697 | struct nfs4_state_owner, so_server_node); | |
1698 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1699 | &sp->so_flags)) | |
1700 | continue; | |
1701 | atomic_inc(&sp->so_count); | |
1702 | spin_unlock(&clp->cl_lock); | |
1703 | rcu_read_unlock(); | |
1704 | ||
1705 | status = nfs4_reclaim_open_state(sp, ops); | |
1706 | if (status < 0) { | |
1707 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1708 | nfs4_put_state_owner(sp); | |
1709 | return nfs4_recovery_handle_error(clp, status); | |
1710 | } | |
1711 | ||
7eff03ae | 1712 | nfs4_put_state_owner(sp); |
24d292b8 | 1713 | goto restart; |
7eff03ae | 1714 | } |
24d292b8 | 1715 | spin_unlock(&clp->cl_lock); |
02860014 | 1716 | } |
24d292b8 | 1717 | rcu_read_unlock(); |
02860014 TM |
1718 | return status; |
1719 | } | |
1720 | ||
1721 | static int nfs4_check_lease(struct nfs_client *clp) | |
1722 | { | |
1723 | struct rpc_cred *cred; | |
c48f4f35 TM |
1724 | const struct nfs4_state_maintenance_ops *ops = |
1725 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1726 | int status; |
1da177e4 | 1727 | |
0f605b56 TM |
1728 | /* Is the client already known to have an expired lease? */ |
1729 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1730 | return 0; | |
a7b72103 AA |
1731 | spin_lock(&clp->cl_lock); |
1732 | cred = ops->get_state_renewal_cred_locked(clp); | |
1733 | spin_unlock(&clp->cl_lock); | |
0f605b56 TM |
1734 | if (cred == NULL) { |
1735 | cred = nfs4_get_setclientid_cred(clp); | |
4f38e4aa | 1736 | status = -ENOKEY; |
0f605b56 TM |
1737 | if (cred == NULL) |
1738 | goto out; | |
286d7d6a | 1739 | } |
8e69514f | 1740 | status = ops->renew_lease(clp, cred); |
0f605b56 | 1741 | put_rpccred(cred); |
bc7a05ca TM |
1742 | if (status == -ETIMEDOUT) { |
1743 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1744 | return 0; | |
1745 | } | |
0f605b56 | 1746 | out: |
4f7cdf18 | 1747 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1748 | } |
1749 | ||
47b803c8 AA |
1750 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1751 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1752 | */ |
1753 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1754 | { | |
1755 | switch (status) { | |
89a21736 TM |
1756 | case -NFS4ERR_SEQ_MISORDERED: |
1757 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1758 | return -ESERVERFAULT; | |
1759 | /* Lease confirmation error: retry after purging the lease */ | |
1760 | ssleep(1); | |
47b803c8 AA |
1761 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1762 | break; | |
2a6ee6aa TM |
1763 | case -NFS4ERR_STALE_CLIENTID: |
1764 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 AA |
1765 | nfs4_state_clear_reclaim_reboot(clp); |
1766 | nfs4_state_start_reclaim_reboot(clp); | |
2a6ee6aa | 1767 | break; |
de734831 CL |
1768 | case -NFS4ERR_CLID_INUSE: |
1769 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1770 | clp->cl_hostname); | |
1771 | nfs_mark_client_ready(clp, -EPERM); | |
1772 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1773 | return -EPERM; | |
2a6ee6aa | 1774 | case -EACCES: |
2a6ee6aa TM |
1775 | case -NFS4ERR_DELAY: |
1776 | case -ETIMEDOUT: | |
1777 | case -EAGAIN: | |
1778 | ssleep(1); | |
1779 | break; | |
1780 | ||
1781 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1782 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1783 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1784 | dprintk("%s: exit with error %d for server %s\n", |
1785 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1786 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1787 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1788 | * in nfs4_exchange_id */ | |
1789 | default: | |
cc0a9843 TM |
1790 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1791 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1792 | return status; |
1793 | } | |
1794 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1795 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1796 | clp->cl_hostname); | |
2a6ee6aa TM |
1797 | return 0; |
1798 | } | |
1799 | ||
b42353ff | 1800 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 TM |
1801 | { |
1802 | struct rpc_cred *cred; | |
c48f4f35 TM |
1803 | const struct nfs4_state_recovery_ops *ops = |
1804 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1805 | int status; |
02860014 | 1806 | |
90a16617 | 1807 | cred = ops->get_clid_cred(clp); |
2a6ee6aa TM |
1808 | if (cred == NULL) |
1809 | return -ENOENT; | |
1810 | status = ops->establish_clid(clp, cred); | |
1811 | put_rpccred(cred); | |
1812 | if (status != 0) | |
b42353ff TM |
1813 | return status; |
1814 | pnfs_destroy_all_layouts(clp); | |
1815 | return 0; | |
1816 | } | |
1817 | ||
6bbb4ae8 CL |
1818 | /* |
1819 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1820 | * to local errno values. | |
1821 | */ | |
b42353ff TM |
1822 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1823 | { | |
1824 | int status; | |
1825 | ||
1826 | status = nfs4_establish_lease(clp); | |
1827 | if (status < 0) | |
1828 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1829 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
1830 | nfs4_state_start_reclaim_nograce(clp); | |
1831 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1832 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1833 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1834 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1835 | return 0; | |
1836 | } | |
1837 | ||
1838 | static int nfs4_purge_lease(struct nfs_client *clp) | |
1839 | { | |
1840 | int status; | |
1841 | ||
1842 | status = nfs4_establish_lease(clp); | |
1843 | if (status < 0) | |
2a6ee6aa | 1844 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
1845 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1846 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1847 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 1848 | return 0; |
02860014 TM |
1849 | } |
1850 | ||
05f4c350 CL |
1851 | /** |
1852 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
1853 | * | |
1854 | * @clp: nfs_client under test | |
1855 | * @result: OUT: found nfs_client, or clp | |
1856 | * | |
1857 | * Returns zero or a negative errno. If zero is returned, | |
1858 | * an nfs_client pointer is planted in "result". | |
1859 | * | |
1860 | * Note: since we are invoked in process context, and | |
1861 | * not from inside the state manager, we cannot use | |
1862 | * nfs4_handle_reclaim_lease_error(). | |
1863 | */ | |
1864 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
1865 | struct nfs_client **result) | |
1866 | { | |
1867 | const struct nfs4_state_recovery_ops *ops = | |
1868 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 CL |
1869 | struct rpc_clnt *clnt; |
1870 | struct rpc_cred *cred; | |
4edaa308 | 1871 | int i, status; |
05f4c350 CL |
1872 | |
1873 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
1874 | ||
05f4c350 | 1875 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
1876 | i = 0; |
1877 | ||
1878 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 1879 | again: |
ea33e6c3 | 1880 | status = -ENOENT; |
05f4c350 CL |
1881 | cred = ops->get_clid_cred(clp); |
1882 | if (cred == NULL) | |
1883 | goto out_unlock; | |
1884 | ||
1885 | status = ops->detect_trunking(clp, result, cred); | |
1886 | put_rpccred(cred); | |
1887 | switch (status) { | |
1888 | case 0: | |
1889 | break; | |
05f4c350 CL |
1890 | case -NFS4ERR_DELAY: |
1891 | case -ETIMEDOUT: | |
1892 | case -EAGAIN: | |
1893 | ssleep(1); | |
202c312d | 1894 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
1895 | dprintk("NFS: %s after status %d, retrying\n", |
1896 | __func__, status); | |
1897 | goto again; | |
4edaa308 CL |
1898 | case -EACCES: |
1899 | if (i++) | |
1900 | break; | |
05f4c350 CL |
1901 | case -NFS4ERR_CLID_INUSE: |
1902 | case -NFS4ERR_WRONGSEC: | |
79d852bf | 1903 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
1904 | if (IS_ERR(clnt)) { |
1905 | status = PTR_ERR(clnt); | |
1906 | break; | |
1907 | } | |
b193d59a TM |
1908 | /* Note: this is safe because we haven't yet marked the |
1909 | * client as ready, so we are the only user of | |
1910 | * clp->cl_rpcclient | |
1911 | */ | |
1912 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
1913 | rpc_shutdown_client(clnt); | |
1914 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
1915 | goto again; |
1916 | ||
1917 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1918 | status = -EPROTONOSUPPORT; | |
1919 | break; | |
1920 | ||
1921 | case -EKEYEXPIRED: | |
05f4c350 CL |
1922 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1923 | * in nfs4_exchange_id */ | |
1924 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
1925 | break; |
1926 | default: | |
1927 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
1928 | __func__, status); | |
1929 | status = -EIO; | |
05f4c350 CL |
1930 | } |
1931 | ||
1932 | out_unlock: | |
1933 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
1934 | dprintk("NFS: %s: status = %d\n", __func__, status); |
1935 | return status; | |
1936 | } | |
1937 | ||
76db6d95 | 1938 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1939 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1940 | { |
444f72fe TM |
1941 | struct nfs_client *clp = session->clp; |
1942 | ||
9f594791 TM |
1943 | switch (err) { |
1944 | default: | |
1945 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1946 | break; | |
1947 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1948 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1949 | } | |
444f72fe | 1950 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1951 | } |
cbdabc7f | 1952 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1953 | |
ac074835 TM |
1954 | static void nfs41_ping_server(struct nfs_client *clp) |
1955 | { | |
1956 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
1957 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1958 | nfs4_schedule_state_manager(clp); | |
1959 | } | |
1960 | ||
1961 | void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) | |
1962 | { | |
1963 | nfs41_ping_server(clp); | |
1964 | } | |
1965 | ||
c10e4498 TM |
1966 | void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
1967 | { | |
1968 | nfs41_ping_server(clp); | |
1969 | } | |
1970 | ||
0f79fd6f TM |
1971 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1972 | { | |
1973 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1974 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1975 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1976 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
1977 | dprintk("%s: scheduling reset of all state for server %s!\n", |
1978 | __func__, clp->cl_hostname); | |
0400a6b0 | 1979 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1980 | } |
1981 | } | |
1982 | ||
1983 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1984 | { | |
1985 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1986 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
1987 | dprintk("%s: server %s rebooted!\n", __func__, |
1988 | clp->cl_hostname); | |
0400a6b0 | 1989 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1990 | } |
1991 | } | |
1992 | ||
1993 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1994 | { | |
0f79fd6f | 1995 | nfs4_reset_all_state(clp); |
cc0a9843 | 1996 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
1997 | } |
1998 | ||
1999 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
2000 | { | |
2001 | /* This will need to handle layouts too */ | |
2002 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
2003 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
2004 | clp->cl_hostname); | |
0f79fd6f TM |
2005 | } |
2006 | ||
a9e64442 | 2007 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
2008 | { |
2009 | nfs_expire_all_delegations(clp); | |
2010 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 2011 | nfs4_schedule_state_manager(clp); |
cc0a9843 TM |
2012 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
2013 | clp->cl_hostname); | |
0f79fd6f TM |
2014 | } |
2015 | ||
a9e64442 WAA |
2016 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
2017 | { | |
2018 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
2019 | &clp->cl_state) == 0) | |
2020 | nfs4_schedule_state_manager(clp); | |
2021 | } | |
2022 | ||
0629e370 AB |
2023 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
2024 | { | |
2025 | if (!flags) | |
2026 | return; | |
2c820d9a CL |
2027 | |
2028 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2029 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
2030 | ||
111d489f | 2031 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2032 | nfs41_handle_server_reboot(clp); |
111d489f | 2033 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
2034 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
2035 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
2036 | SEQ4_STATUS_LEASE_MOVED)) |
2037 | nfs41_handle_state_revoked(clp); | |
111d489f | 2038 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2039 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
2040 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2041 | nfs41_handle_backchannel_fault(clp); | |
2042 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2043 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2044 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2045 | } |
2046 | ||
c3fad1b1 AA |
2047 | static int nfs4_reset_session(struct nfs_client *clp) |
2048 | { | |
848f5bda | 2049 | struct rpc_cred *cred; |
c3fad1b1 AA |
2050 | int status; |
2051 | ||
1a47e7a6 TM |
2052 | if (!nfs4_has_session(clp)) |
2053 | return 0; | |
38045412 | 2054 | nfs4_begin_drain_session(clp); |
848f5bda TM |
2055 | cred = nfs4_get_exchange_id_cred(clp); |
2056 | status = nfs4_proc_destroy_session(clp->cl_session, cred); | |
c489ee29 TM |
2057 | switch (status) { |
2058 | case 0: | |
2059 | case -NFS4ERR_BADSESSION: | |
2060 | case -NFS4ERR_DEADSESSION: | |
2061 | break; | |
2062 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2063 | case -NFS4ERR_DELAY: | |
2064 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2065 | status = 0; | |
2066 | ssleep(1); | |
2067 | goto out; | |
2068 | default: | |
f455848a | 2069 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2070 | goto out; |
2071 | } | |
2072 | ||
2073 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2074 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2075 | if (status) { |
cc0a9843 TM |
2076 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2077 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2078 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2079 | goto out; |
2080 | } | |
bda197f5 | 2081 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2082 | dprintk("%s: session reset was successful for server %s!\n", |
2083 | __func__, clp->cl_hostname); | |
41f54a55 | 2084 | out: |
848f5bda TM |
2085 | if (cred) |
2086 | put_rpccred(cred); | |
c3fad1b1 AA |
2087 | return status; |
2088 | } | |
76db6d95 | 2089 | |
a9e64442 WAA |
2090 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2091 | { | |
2cf047c9 TM |
2092 | struct rpc_cred *cred; |
2093 | int ret; | |
2094 | ||
1a47e7a6 TM |
2095 | if (!nfs4_has_session(clp)) |
2096 | return 0; | |
43ac544c | 2097 | nfs4_begin_drain_session(clp); |
2cf047c9 TM |
2098 | cred = nfs4_get_exchange_id_cred(clp); |
2099 | ret = nfs4_proc_bind_conn_to_session(clp, cred); | |
2100 | if (cred) | |
2101 | put_rpccred(cred); | |
43ac544c | 2102 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2103 | switch (ret) { |
2104 | case 0: | |
cc0a9843 TM |
2105 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2106 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2107 | break; |
2108 | case -NFS4ERR_DELAY: | |
2109 | ssleep(1); | |
2110 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2111 | break; | |
2112 | default: | |
2113 | return nfs4_recovery_handle_error(clp, ret); | |
2114 | } | |
2115 | return 0; | |
a9e64442 | 2116 | } |
76db6d95 | 2117 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2118 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
5601a00d | 2119 | static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
2120 | |
2121 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2122 | { | |
2123 | return 0; | |
2124 | } | |
76db6d95 AA |
2125 | #endif /* CONFIG_NFS_V4_1 */ |
2126 | ||
e005e804 | 2127 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2128 | { |
02860014 | 2129 | int status = 0; |
8ed27d4f | 2130 | const char *section = "", *section_sep = ""; |
02860014 | 2131 | |
02860014 | 2132 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2133 | do { |
2c820d9a | 2134 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2135 | section = "purge state"; |
b42353ff | 2136 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2137 | if (status < 0) |
2138 | goto out_error; | |
b42353ff | 2139 | continue; |
2c820d9a CL |
2140 | } |
2141 | ||
b42353ff | 2142 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2143 | section = "lease expired"; |
b79a4a1b TM |
2144 | /* We're going to have to re-establish a clientid */ |
2145 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2146 | if (status < 0) |
b79a4a1b | 2147 | goto out_error; |
b42353ff | 2148 | continue; |
e598d843 TM |
2149 | } |
2150 | ||
c3fad1b1 | 2151 | /* Initialize or reset the session */ |
1a47e7a6 | 2152 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2153 | section = "reset session"; |
4d643d1d | 2154 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2155 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2156 | continue; | |
2157 | if (status < 0) | |
76db6d95 | 2158 | goto out_error; |
76db6d95 | 2159 | } |
b6d408ba | 2160 | |
a9e64442 WAA |
2161 | /* Send BIND_CONN_TO_SESSION */ |
2162 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2163 | &clp->cl_state)) { |
8ed27d4f | 2164 | section = "bind conn to session"; |
a9e64442 WAA |
2165 | status = nfs4_bind_conn_to_session(clp); |
2166 | if (status < 0) | |
2167 | goto out_error; | |
bf674c82 | 2168 | continue; |
a9e64442 WAA |
2169 | } |
2170 | ||
5df904ae TM |
2171 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2172 | section = "check lease"; | |
2173 | status = nfs4_check_lease(clp); | |
2174 | if (status < 0) | |
2175 | goto out_error; | |
2176 | continue; | |
2177 | } | |
2178 | ||
b79a4a1b | 2179 | /* First recover reboot state... */ |
e345e88a | 2180 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2181 | section = "reclaim reboot"; |
591d71cb | 2182 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2183 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 2184 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2185 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 2186 | continue; |
b79a4a1b | 2187 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
2188 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
2189 | continue; | |
2190 | if (status < 0) | |
2191 | goto out_error; | |
02860014 TM |
2192 | } |
2193 | ||
b79a4a1b TM |
2194 | /* Now recover expired state... */ |
2195 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2196 | section = "reclaim nograce"; |
591d71cb | 2197 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2198 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 2199 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2200 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
2201 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
2202 | continue; | |
2203 | if (status < 0) | |
b79a4a1b | 2204 | goto out_error; |
1da177e4 | 2205 | } |
707fb4b3 | 2206 | |
5601a00d | 2207 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
2208 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
2209 | nfs_client_return_marked_delegations(clp); | |
2210 | continue; | |
2211 | } | |
e005e804 TM |
2212 | |
2213 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
2214 | /* Did we race with an attempt to give us more work? */ |
2215 | if (clp->cl_state == 0) | |
2216 | break; | |
2217 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
2218 | break; | |
47c2199b | 2219 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 2220 | return; |
1da177e4 | 2221 | out_error: |
8ed27d4f WAA |
2222 | if (strlen(section)) |
2223 | section_sep = ": "; | |
2224 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2225 | " with error %d\n", section_sep, section, | |
2226 | clp->cl_hostname, -status); | |
ffe5a830 | 2227 | ssleep(1); |
5601a00d | 2228 | nfs4_end_drain_session(clp); |
e005e804 TM |
2229 | nfs4_clear_state_manager_bit(clp); |
2230 | } | |
2231 | ||
2232 | static int nfs4_run_state_manager(void *ptr) | |
2233 | { | |
2234 | struct nfs_client *clp = ptr; | |
2235 | ||
2236 | allow_signal(SIGKILL); | |
2237 | nfs4_state_manager(clp); | |
2238 | nfs_put_client(clp); | |
2239 | module_put_and_exit(0); | |
2240 | return 0; | |
1da177e4 LT |
2241 | } |
2242 | ||
2243 | /* | |
2244 | * Local variables: | |
2245 | * c-basic-offset: 8 | |
2246 | * End: | |
2247 | */ |