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 | ||
d688f7b8 CL |
157 | static void nfs4_root_machine_cred(struct nfs_client *clp) |
158 | { | |
159 | struct rpc_cred *cred, *new; | |
160 | ||
161 | new = rpc_lookup_machine_cred(NULL); | |
162 | spin_lock(&clp->cl_lock); | |
163 | cred = clp->cl_machine_cred; | |
164 | clp->cl_machine_cred = new; | |
165 | spin_unlock(&clp->cl_lock); | |
166 | if (cred != NULL) | |
167 | put_rpccred(cred); | |
168 | } | |
169 | ||
24d292b8 CL |
170 | static struct rpc_cred * |
171 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) | |
b4454fe1 | 172 | { |
24d292b8 | 173 | struct rpc_cred *cred = NULL; |
b4454fe1 | 174 | struct nfs4_state_owner *sp; |
9f958ab8 | 175 | struct rb_node *pos; |
b4454fe1 | 176 | |
24d292b8 CL |
177 | for (pos = rb_first(&server->state_owners); |
178 | pos != NULL; | |
179 | pos = rb_next(pos)) { | |
180 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
181 | if (list_empty(&sp->so_states)) |
182 | continue; | |
183 | cred = get_rpccred(sp->so_cred); | |
184 | break; | |
185 | } | |
186 | return cred; | |
187 | } | |
188 | ||
24d292b8 CL |
189 | /** |
190 | * nfs4_get_renew_cred_locked - Acquire credential for a renew operation | |
191 | * @clp: client state handle | |
192 | * | |
193 | * Returns an rpc_cred with reference count bumped, or NULL. | |
194 | * Caller must hold clp->cl_lock. | |
195 | */ | |
196 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) | |
197 | { | |
198 | struct rpc_cred *cred = NULL; | |
199 | struct nfs_server *server; | |
200 | ||
e49a29bd SP |
201 | /* Use machine credentials if available */ |
202 | cred = nfs4_get_machine_cred_locked(clp); | |
203 | if (cred != NULL) | |
204 | goto out; | |
205 | ||
24d292b8 CL |
206 | rcu_read_lock(); |
207 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
208 | cred = nfs4_get_renew_cred_server_locked(server); | |
209 | if (cred != NULL) | |
210 | break; | |
211 | } | |
212 | rcu_read_unlock(); | |
e49a29bd SP |
213 | |
214 | out: | |
24d292b8 CL |
215 | return cred; |
216 | } | |
217 | ||
b4b82607 AA |
218 | #if defined(CONFIG_NFS_V4_1) |
219 | ||
9430fb6b RL |
220 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
221 | { | |
222 | int status; | |
223 | struct nfs_fsinfo fsinfo; | |
224 | ||
d6fb79d4 AA |
225 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
226 | nfs4_schedule_state_renewal(clp); | |
227 | return 0; | |
228 | } | |
229 | ||
9430fb6b RL |
230 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
231 | if (status == 0) { | |
232 | /* Update lease time and schedule renewal */ | |
233 | spin_lock(&clp->cl_lock); | |
234 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
235 | clp->cl_last_renewal = jiffies; | |
236 | spin_unlock(&clp->cl_lock); | |
237 | ||
238 | nfs4_schedule_state_renewal(clp); | |
239 | } | |
240 | ||
241 | return status; | |
242 | } | |
243 | ||
62f288a0 | 244 | static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl) |
9dfdf404 | 245 | { |
774d5f14 | 246 | if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
961a828d | 247 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 248 | nfs41_wake_slot_table(tbl); |
961a828d | 249 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 250 | } |
9dfdf404 RL |
251 | } |
252 | ||
62f288a0 AA |
253 | static void nfs4_end_drain_session(struct nfs_client *clp) |
254 | { | |
255 | struct nfs4_session *ses = clp->cl_session; | |
256 | ||
257 | if (ses != NULL) { | |
258 | nfs4_end_drain_slot_table(&ses->bc_slot_table); | |
259 | nfs4_end_drain_slot_table(&ses->fc_slot_table); | |
260 | } | |
261 | } | |
262 | ||
5d63360d TM |
263 | /* |
264 | * Signal state manager thread if session fore channel is drained | |
265 | */ | |
774d5f14 | 266 | void nfs4_slot_tbl_drain_complete(struct nfs4_slot_table *tbl) |
5d63360d | 267 | { |
774d5f14 | 268 | if (nfs4_slot_tbl_draining(tbl)) |
5d63360d TM |
269 | complete(&tbl->complete); |
270 | } | |
271 | ||
774d5f14 | 272 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 273 | { |
774d5f14 | 274 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 275 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 276 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 277 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 278 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 279 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
280 | } |
281 | spin_unlock(&tbl->slot_tbl_lock); | |
282 | return 0; | |
283 | } | |
284 | ||
42acd021 AA |
285 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
286 | { | |
287 | struct nfs4_session *ses = clp->cl_session; | |
288 | int ret = 0; | |
289 | ||
42acd021 | 290 | /* back channel */ |
774d5f14 | 291 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
292 | if (ret) |
293 | return ret; | |
294 | /* fore channel */ | |
774d5f14 | 295 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
296 | } |
297 | ||
bda197f5 TM |
298 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
299 | { | |
300 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
301 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
302 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
303 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
304 | nfs41_setup_state_renewal(clp); | |
305 | } | |
306 | ||
4d643d1d AA |
307 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
308 | { | |
309 | int status; | |
310 | ||
fd954ae1 TM |
311 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
312 | goto do_confirm; | |
38045412 | 313 | nfs4_begin_drain_session(clp); |
4d643d1d | 314 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
315 | if (status != 0) |
316 | goto out; | |
fd954ae1 TM |
317 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
318 | do_confirm: | |
848f5bda | 319 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
320 | if (status != 0) |
321 | goto out; | |
bda197f5 | 322 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
323 | nfs_mark_client_ready(clp, NFS_CS_READY); |
324 | out: | |
4d643d1d AA |
325 | return status; |
326 | } | |
327 | ||
05f4c350 CL |
328 | /** |
329 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
330 | * | |
331 | * @clp: nfs_client under test | |
332 | * @result: OUT: found nfs_client, or clp | |
333 | * @cred: credential to use for trunking test | |
334 | * | |
335 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
336 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
337 | * "result". | |
338 | * | |
339 | * Note: The returned client may not yet be marked ready. | |
340 | */ | |
341 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
342 | struct nfs_client **result, | |
343 | struct rpc_cred *cred) | |
344 | { | |
345 | int status; | |
346 | ||
347 | status = nfs4_proc_exchange_id(clp, cred); | |
348 | if (status != NFS4_OK) | |
349 | return status; | |
fd483570 | 350 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
05f4c350 CL |
351 | |
352 | return nfs41_walk_client_list(clp, result, cred); | |
353 | } | |
354 | ||
b4b82607 AA |
355 | #endif /* CONFIG_NFS_V4_1 */ |
356 | ||
24d292b8 | 357 | /** |
73d8bde5 | 358 | * nfs4_get_clid_cred - Acquire credential for a setclientid operation |
24d292b8 CL |
359 | * @clp: client state handle |
360 | * | |
361 | * Returns an rpc_cred with reference count bumped, or NULL. | |
362 | */ | |
73d8bde5 | 363 | struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp) |
24d292b8 | 364 | { |
a2b2bb88 | 365 | struct rpc_cred *cred; |
286d7d6a | 366 | |
6dc9d57a TM |
367 | spin_lock(&clp->cl_lock); |
368 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 369 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 370 | return cred; |
286d7d6a TM |
371 | } |
372 | ||
1da177e4 | 373 | static struct nfs4_state_owner * |
24d292b8 | 374 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 375 | { |
24d292b8 | 376 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 377 | *parent = NULL; |
414adf14 | 378 | struct nfs4_state_owner *sp; |
1da177e4 | 379 | |
9f958ab8 TM |
380 | while (*p != NULL) { |
381 | parent = *p; | |
24d292b8 | 382 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
383 | |
384 | if (cred < sp->so_cred) | |
385 | p = &parent->rb_left; | |
386 | else if (cred > sp->so_cred) | |
387 | p = &parent->rb_right; | |
388 | else { | |
0aaaf5c4 CL |
389 | if (!list_empty(&sp->so_lru)) |
390 | list_del_init(&sp->so_lru); | |
9f958ab8 | 391 | atomic_inc(&sp->so_count); |
414adf14 | 392 | return sp; |
9f958ab8 | 393 | } |
1da177e4 | 394 | } |
414adf14 | 395 | return NULL; |
1da177e4 LT |
396 | } |
397 | ||
9f958ab8 | 398 | static struct nfs4_state_owner * |
24d292b8 | 399 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 400 | { |
24d292b8 CL |
401 | struct nfs_server *server = new->so_server; |
402 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
403 | *parent = NULL; |
404 | struct nfs4_state_owner *sp; | |
9157c31d | 405 | int err; |
9f958ab8 TM |
406 | |
407 | while (*p != NULL) { | |
408 | parent = *p; | |
24d292b8 | 409 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
410 | |
411 | if (new->so_cred < sp->so_cred) | |
412 | p = &parent->rb_left; | |
413 | else if (new->so_cred > sp->so_cred) | |
414 | p = &parent->rb_right; | |
415 | else { | |
0aaaf5c4 CL |
416 | if (!list_empty(&sp->so_lru)) |
417 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
418 | atomic_inc(&sp->so_count); |
419 | return sp; | |
420 | } | |
421 | } | |
48c22eb2 | 422 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
423 | if (err) |
424 | return ERR_PTR(err); | |
24d292b8 CL |
425 | rb_link_node(&new->so_server_node, parent, p); |
426 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
427 | return new; |
428 | } | |
429 | ||
430 | static void | |
24d292b8 | 431 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 432 | { |
24d292b8 CL |
433 | struct nfs_server *server = sp->so_server; |
434 | ||
435 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
436 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 437 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
438 | } |
439 | ||
7ba127ab TM |
440 | static void |
441 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
442 | { | |
95b72eb0 | 443 | sc->create_time = ktime_get(); |
7ba127ab TM |
444 | sc->flags = 0; |
445 | sc->counter = 0; | |
446 | spin_lock_init(&sc->lock); | |
447 | INIT_LIST_HEAD(&sc->list); | |
448 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
449 | } | |
450 | ||
451 | static void | |
452 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
453 | { | |
454 | rpc_destroy_wait_queue(&sc->wait); | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /* |
458 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
459 | * create a new state_owner. | |
460 | * | |
461 | */ | |
462 | static struct nfs4_state_owner * | |
d1e284d5 TM |
463 | nfs4_alloc_state_owner(struct nfs_server *server, |
464 | struct rpc_cred *cred, | |
465 | gfp_t gfp_flags) | |
1da177e4 LT |
466 | { |
467 | struct nfs4_state_owner *sp; | |
468 | ||
d1e284d5 | 469 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
470 | if (!sp) |
471 | return NULL; | |
d1e284d5 TM |
472 | sp->so_server = server; |
473 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 474 | spin_lock_init(&sp->so_lock); |
1da177e4 | 475 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 476 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 477 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 478 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 479 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 480 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
481 | return sp; |
482 | } | |
483 | ||
1d2e88e7 | 484 | static void |
1da177e4 LT |
485 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
486 | { | |
c77365c9 TM |
487 | struct rb_node *rb_node = &sp->so_server_node; |
488 | ||
489 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
490 | struct nfs_server *server = sp->so_server; |
491 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
492 | |
493 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
494 | if (!RB_EMPTY_NODE(rb_node)) { |
495 | rb_erase(rb_node, &server->state_owners); | |
496 | RB_CLEAR_NODE(rb_node); | |
497 | } | |
9f958ab8 TM |
498 | spin_unlock(&clp->cl_lock); |
499 | } | |
1da177e4 LT |
500 | } |
501 | ||
0aaaf5c4 CL |
502 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
503 | { | |
7ba127ab | 504 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
505 | put_rpccred(sp->so_cred); |
506 | kfree(sp); | |
507 | } | |
508 | ||
509 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
510 | { | |
511 | struct nfs_client *clp = server->nfs_client; | |
512 | struct nfs4_state_owner *sp, *tmp; | |
513 | unsigned long time_min, time_max; | |
514 | LIST_HEAD(doomed); | |
515 | ||
516 | spin_lock(&clp->cl_lock); | |
517 | time_max = jiffies; | |
518 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
519 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
520 | /* NB: LRU is sorted so that oldest is at the head */ | |
521 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
522 | break; | |
523 | list_move(&sp->so_lru, &doomed); | |
524 | nfs4_remove_state_owner_locked(sp); | |
525 | } | |
526 | spin_unlock(&clp->cl_lock); | |
527 | ||
528 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
529 | list_del(&sp->so_lru); | |
530 | nfs4_free_state_owner(sp); | |
531 | } | |
532 | } | |
533 | ||
24d292b8 CL |
534 | /** |
535 | * nfs4_get_state_owner - Look up a state owner given a credential | |
536 | * @server: nfs_server to search | |
537 | * @cred: RPC credential to match | |
538 | * | |
539 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
540 | */ | |
541 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
542 | struct rpc_cred *cred, |
543 | gfp_t gfp_flags) | |
1da177e4 | 544 | { |
7539bbab | 545 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
546 | struct nfs4_state_owner *sp, *new; |
547 | ||
1da177e4 | 548 | spin_lock(&clp->cl_lock); |
24d292b8 | 549 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 550 | spin_unlock(&clp->cl_lock); |
1da177e4 | 551 | if (sp != NULL) |
0aaaf5c4 | 552 | goto out; |
d1e284d5 | 553 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 554 | if (new == NULL) |
0aaaf5c4 | 555 | goto out; |
9157c31d TM |
556 | do { |
557 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
558 | break; | |
559 | spin_lock(&clp->cl_lock); | |
560 | sp = nfs4_insert_state_owner_locked(new); | |
561 | spin_unlock(&clp->cl_lock); | |
562 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
563 | if (sp != new) |
564 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
565 | out: |
566 | nfs4_gc_state_owners(server); | |
9f958ab8 | 567 | return sp; |
1da177e4 LT |
568 | } |
569 | ||
24d292b8 CL |
570 | /** |
571 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
572 | * @sp: state owner data to release | |
7bf97bc2 TM |
573 | * |
574 | * Note that we keep released state owners on an LRU | |
575 | * list. | |
576 | * This caches valid state owners so that they can be | |
577 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
578 | * It also pins the uniquifier of dropped state owners for | |
579 | * a while, to ensure that those state owner names are | |
580 | * never reused. | |
24d292b8 | 581 | */ |
1da177e4 LT |
582 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
583 | { | |
0aaaf5c4 CL |
584 | struct nfs_server *server = sp->so_server; |
585 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
586 | |
587 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
588 | return; | |
0aaaf5c4 | 589 | |
7bf97bc2 TM |
590 | sp->so_expires = jiffies; |
591 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
592 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
593 | } |
594 | ||
595 | /** | |
596 | * nfs4_purge_state_owners - Release all cached state owners | |
597 | * @server: nfs_server with cached state owners to release | |
598 | * | |
599 | * Called at umount time. Remaining state owners will be on | |
600 | * the LRU with ref count of zero. | |
601 | */ | |
602 | void nfs4_purge_state_owners(struct nfs_server *server) | |
603 | { | |
604 | struct nfs_client *clp = server->nfs_client; | |
605 | struct nfs4_state_owner *sp, *tmp; | |
606 | LIST_HEAD(doomed); | |
607 | ||
608 | spin_lock(&clp->cl_lock); | |
609 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
610 | list_move(&sp->so_lru, &doomed); | |
611 | nfs4_remove_state_owner_locked(sp); | |
612 | } | |
1da177e4 | 613 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
614 | |
615 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
616 | list_del(&sp->so_lru); | |
617 | nfs4_free_state_owner(sp); | |
618 | } | |
1da177e4 LT |
619 | } |
620 | ||
621 | static struct nfs4_state * | |
622 | nfs4_alloc_open_state(void) | |
623 | { | |
624 | struct nfs4_state *state; | |
625 | ||
8535b2be | 626 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
627 | if (!state) |
628 | return NULL; | |
1da177e4 LT |
629 | atomic_set(&state->count, 1); |
630 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 631 | spin_lock_init(&state->state_lock); |
8bda4e4c | 632 | seqlock_init(&state->seqlock); |
1da177e4 LT |
633 | return state; |
634 | } | |
635 | ||
4cecb76f | 636 | void |
dc0b027d | 637 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 638 | { |
dc0b027d | 639 | if (state->state == fmode) |
4cecb76f TM |
640 | return; |
641 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
642 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
643 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
644 | list_move(&state->open_states, &state->owner->so_states); |
645 | else | |
646 | list_move_tail(&state->open_states, &state->owner->so_states); | |
647 | } | |
dc0b027d | 648 | state->state = fmode; |
4cecb76f TM |
649 | } |
650 | ||
1da177e4 LT |
651 | static struct nfs4_state * |
652 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
653 | { | |
654 | struct nfs_inode *nfsi = NFS_I(inode); | |
655 | struct nfs4_state *state; | |
656 | ||
657 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 658 | if (state->owner != owner) |
1da177e4 | 659 | continue; |
5d422301 TM |
660 | if (!nfs4_valid_open_stateid(state)) |
661 | continue; | |
1c816efa | 662 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 663 | return state; |
1da177e4 LT |
664 | } |
665 | return NULL; | |
666 | } | |
667 | ||
1da177e4 LT |
668 | static void |
669 | nfs4_free_open_state(struct nfs4_state *state) | |
670 | { | |
671 | kfree(state); | |
672 | } | |
673 | ||
674 | struct nfs4_state * | |
675 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
676 | { | |
677 | struct nfs4_state *state, *new; | |
678 | struct nfs_inode *nfsi = NFS_I(inode); | |
679 | ||
680 | spin_lock(&inode->i_lock); | |
681 | state = __nfs4_find_state_byowner(inode, owner); | |
682 | spin_unlock(&inode->i_lock); | |
683 | if (state) | |
684 | goto out; | |
685 | new = nfs4_alloc_open_state(); | |
ec073428 | 686 | spin_lock(&owner->so_lock); |
1da177e4 LT |
687 | spin_lock(&inode->i_lock); |
688 | state = __nfs4_find_state_byowner(inode, owner); | |
689 | if (state == NULL && new != NULL) { | |
690 | state = new; | |
1da177e4 LT |
691 | state->owner = owner; |
692 | atomic_inc(&owner->so_count); | |
693 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
694 | ihold(inode); |
695 | state->inode = inode; | |
1da177e4 | 696 | spin_unlock(&inode->i_lock); |
ec073428 TM |
697 | /* Note: The reclaim code dictates that we add stateless |
698 | * and read-only stateids to the end of the list */ | |
699 | list_add_tail(&state->open_states, &owner->so_states); | |
700 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
701 | } else { |
702 | spin_unlock(&inode->i_lock); | |
ec073428 | 703 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
704 | if (new) |
705 | nfs4_free_open_state(new); | |
706 | } | |
707 | out: | |
708 | return state; | |
709 | } | |
710 | ||
1da177e4 LT |
711 | void nfs4_put_open_state(struct nfs4_state *state) |
712 | { | |
713 | struct inode *inode = state->inode; | |
714 | struct nfs4_state_owner *owner = state->owner; | |
715 | ||
ec073428 | 716 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 717 | return; |
ec073428 | 718 | spin_lock(&inode->i_lock); |
ba683031 | 719 | list_del(&state->inode_states); |
1da177e4 | 720 | list_del(&state->open_states); |
ec073428 TM |
721 | spin_unlock(&inode->i_lock); |
722 | spin_unlock(&owner->so_lock); | |
1da177e4 | 723 | iput(inode); |
1da177e4 LT |
724 | nfs4_free_open_state(state); |
725 | nfs4_put_state_owner(owner); | |
726 | } | |
727 | ||
728 | /* | |
83c9d41e | 729 | * Close the current file. |
1da177e4 | 730 | */ |
643168c2 | 731 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 732 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 733 | { |
1da177e4 | 734 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 735 | int call_close = 0; |
dc0b027d | 736 | fmode_t newstate; |
1da177e4 LT |
737 | |
738 | atomic_inc(&owner->so_count); | |
1da177e4 | 739 | /* Protect against nfs4_find_state() */ |
ec073428 | 740 | spin_lock(&owner->so_lock); |
dc0b027d | 741 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
742 | case FMODE_READ: |
743 | state->n_rdonly--; | |
744 | break; | |
745 | case FMODE_WRITE: | |
746 | state->n_wronly--; | |
747 | break; | |
748 | case FMODE_READ|FMODE_WRITE: | |
749 | state->n_rdwr--; | |
750 | } | |
003707c7 | 751 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 752 | if (state->n_rdwr == 0) { |
003707c7 | 753 | if (state->n_rdonly == 0) { |
e7616923 | 754 | newstate &= ~FMODE_READ; |
003707c7 TM |
755 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
756 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
757 | } | |
758 | if (state->n_wronly == 0) { | |
e7616923 | 759 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
760 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
761 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
762 | } | |
763 | if (newstate == 0) | |
764 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 765 | } |
003707c7 | 766 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 767 | spin_unlock(&owner->so_lock); |
4cecb76f | 768 | |
003707c7 | 769 | if (!call_close) { |
b39e625b TM |
770 | nfs4_put_open_state(state); |
771 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
772 | } else |
773 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
774 | } |
775 | ||
643168c2 | 776 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 777 | { |
643168c2 | 778 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
779 | } |
780 | ||
643168c2 | 781 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 782 | { |
643168c2 | 783 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
784 | } |
785 | ||
786 | /* | |
787 | * Search the state->lock_states for an existing lock_owner | |
788 | * that is compatible with current->files | |
789 | */ | |
790 | static struct nfs4_lock_state * | |
77041ed9 | 791 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
792 | { |
793 | struct nfs4_lock_state *pos; | |
794 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 795 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 796 | continue; |
77041ed9 TM |
797 | switch (pos->ls_owner.lo_type) { |
798 | case NFS4_POSIX_LOCK_TYPE: | |
799 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
800 | continue; | |
801 | break; | |
802 | case NFS4_FLOCK_LOCK_TYPE: | |
803 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
804 | continue; | |
805 | } | |
1da177e4 LT |
806 | atomic_inc(&pos->ls_count); |
807 | return pos; | |
808 | } | |
809 | return NULL; | |
810 | } | |
811 | ||
1da177e4 LT |
812 | /* |
813 | * Return a compatible lock_state. If no initialized lock_state structure | |
814 | * exists, return an uninitialized one. | |
815 | * | |
1da177e4 | 816 | */ |
77041ed9 | 817 | 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 |
818 | { |
819 | struct nfs4_lock_state *lsp; | |
24d292b8 | 820 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 821 | |
8535b2be | 822 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
823 | if (lsp == NULL) |
824 | return NULL; | |
7ba127ab | 825 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 826 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 827 | lsp->ls_state = state; |
77041ed9 TM |
828 | lsp->ls_owner.lo_type = type; |
829 | switch (lsp->ls_owner.lo_type) { | |
830 | case NFS4_FLOCK_LOCK_TYPE: | |
831 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
832 | break; | |
833 | case NFS4_POSIX_LOCK_TYPE: | |
834 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
835 | break; | |
836 | default: | |
d2d7ce28 | 837 | goto out_free; |
77041ed9 | 838 | } |
48c22eb2 TM |
839 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
840 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 841 | goto out_free; |
8d0a8a9d | 842 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 843 | return lsp; |
d2d7ce28 TM |
844 | out_free: |
845 | kfree(lsp); | |
846 | return NULL; | |
1da177e4 LT |
847 | } |
848 | ||
5ae67c4f | 849 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 850 | { |
48c22eb2 | 851 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 852 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
853 | kfree(lsp); |
854 | } | |
855 | ||
1da177e4 LT |
856 | /* |
857 | * Return a compatible lock_state. If no initialized lock_state structure | |
858 | * exists, return an uninitialized one. | |
859 | * | |
1da177e4 | 860 | */ |
77041ed9 | 861 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 862 | { |
8d0a8a9d | 863 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 864 | |
8d0a8a9d TM |
865 | for(;;) { |
866 | spin_lock(&state->state_lock); | |
77041ed9 | 867 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
868 | if (lsp != NULL) |
869 | break; | |
870 | if (new != NULL) { | |
8d0a8a9d TM |
871 | list_add(&new->ls_locks, &state->lock_states); |
872 | set_bit(LK_STATE_IN_USE, &state->flags); | |
873 | lsp = new; | |
874 | new = NULL; | |
875 | break; | |
876 | } | |
877 | spin_unlock(&state->state_lock); | |
77041ed9 | 878 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
879 | if (new == NULL) |
880 | return NULL; | |
881 | } | |
882 | spin_unlock(&state->state_lock); | |
9f958ab8 | 883 | if (new != NULL) |
5ae67c4f | 884 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
885 | return lsp; |
886 | } | |
887 | ||
888 | /* | |
8d0a8a9d TM |
889 | * Release reference to lock_state, and free it if we see that |
890 | * it is no longer in use | |
1da177e4 | 891 | */ |
faf5f49c | 892 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 893 | { |
c8b2d0bf | 894 | struct nfs_server *server; |
8d0a8a9d | 895 | struct nfs4_state *state; |
1da177e4 | 896 | |
8d0a8a9d TM |
897 | if (lsp == NULL) |
898 | return; | |
899 | state = lsp->ls_state; | |
900 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
901 | return; | |
902 | list_del(&lsp->ls_locks); | |
903 | if (list_empty(&state->lock_states)) | |
904 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
905 | spin_unlock(&state->state_lock); | |
c8b2d0bf | 906 | server = state->owner->so_server; |
795a88c9 | 907 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
c8b2d0bf TM |
908 | struct nfs_client *clp = server->nfs_client; |
909 | ||
910 | clp->cl_mvops->free_lock_state(server, lsp); | |
911 | } else | |
912 | nfs4_free_lock_state(server, lsp); | |
1da177e4 LT |
913 | } |
914 | ||
8d0a8a9d | 915 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 916 | { |
8d0a8a9d | 917 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 918 | |
8d0a8a9d TM |
919 | dst->fl_u.nfs4_fl.owner = lsp; |
920 | atomic_inc(&lsp->ls_count); | |
921 | } | |
1da177e4 | 922 | |
8d0a8a9d | 923 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 924 | { |
8d0a8a9d | 925 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
926 | } |
927 | ||
6aed6285 | 928 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
929 | .fl_copy_lock = nfs4_fl_copy_lock, |
930 | .fl_release_private = nfs4_fl_release_lock, | |
931 | }; | |
932 | ||
933 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 934 | { |
8d0a8a9d TM |
935 | struct nfs4_lock_state *lsp; |
936 | ||
937 | if (fl->fl_ops != NULL) | |
938 | return 0; | |
77041ed9 TM |
939 | if (fl->fl_flags & FL_POSIX) |
940 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
941 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
942 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
943 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
944 | else |
945 | return -EINVAL; | |
8d0a8a9d TM |
946 | if (lsp == NULL) |
947 | return -ENOMEM; | |
948 | fl->fl_u.nfs4_fl.owner = lsp; | |
949 | fl->fl_ops = &nfs4_fl_lock_ops; | |
950 | return 0; | |
1da177e4 LT |
951 | } |
952 | ||
5521abfd TM |
953 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
954 | struct nfs4_state *state, | |
2a369153 | 955 | const struct nfs_lockowner *lockowner) |
1da177e4 | 956 | { |
8d0a8a9d | 957 | struct nfs4_lock_state *lsp; |
2a369153 TM |
958 | fl_owner_t fl_owner; |
959 | pid_t fl_pid; | |
5521abfd | 960 | int ret = -ENOENT; |
1da177e4 | 961 | |
2a369153 TM |
962 | |
963 | if (lockowner == NULL) | |
964 | goto out; | |
965 | ||
8d0a8a9d | 966 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 967 | goto out; |
1da177e4 | 968 | |
2a369153 TM |
969 | fl_owner = lockowner->l_owner; |
970 | fl_pid = lockowner->l_pid; | |
8d0a8a9d | 971 | spin_lock(&state->state_lock); |
77041ed9 | 972 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
795a88c9 | 973 | if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
f597c537 | 974 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd TM |
975 | ret = 0; |
976 | smp_rmb(); | |
977 | if (!list_empty(&lsp->ls_seqid.list)) | |
978 | ret = -EWOULDBLOCK; | |
4fc8796d | 979 | } |
8d0a8a9d | 980 | spin_unlock(&state->state_lock); |
1da177e4 | 981 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
982 | out: |
983 | return ret; | |
984 | } | |
985 | ||
5521abfd | 986 | static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 987 | { |
92b40e93 | 988 | const nfs4_stateid *src; |
5521abfd | 989 | int ret; |
4fc8796d TM |
990 | int seq; |
991 | ||
992 | do { | |
92b40e93 | 993 | src = &zero_stateid; |
4fc8796d | 994 | seq = read_seqbegin(&state->seqlock); |
92b40e93 TM |
995 | if (test_bit(NFS_OPEN_STATE, &state->flags)) |
996 | src = &state->open_stateid; | |
997 | nfs4_stateid_copy(dst, src); | |
5521abfd TM |
998 | ret = 0; |
999 | smp_rmb(); | |
1000 | if (!list_empty(&state->owner->so_seqid.list)) | |
1001 | ret = -EWOULDBLOCK; | |
4fc8796d | 1002 | } while (read_seqretry(&state->seqlock, seq)); |
5521abfd | 1003 | return ret; |
4fc8796d TM |
1004 | } |
1005 | ||
1006 | /* | |
1007 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1008 | * requests. | |
1009 | */ | |
5521abfd | 1010 | int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
2a369153 | 1011 | fmode_t fmode, const struct nfs_lockowner *lockowner) |
4fc8796d | 1012 | { |
5521abfd | 1013 | int ret = 0; |
4fc8796d | 1014 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) |
5521abfd TM |
1015 | goto out; |
1016 | ret = nfs4_copy_lock_stateid(dst, state, lockowner); | |
1017 | if (ret != -ENOENT) | |
1018 | goto out; | |
1019 | ret = nfs4_copy_open_stateid(dst, state); | |
1020 | out: | |
3b66486c TM |
1021 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1022 | dst->seqid = 0; | |
5521abfd | 1023 | return ret; |
1da177e4 LT |
1024 | } |
1025 | ||
8535b2be | 1026 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1027 | { |
cee54fc9 TM |
1028 | struct nfs_seqid *new; |
1029 | ||
8535b2be | 1030 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
1031 | if (new != NULL) { |
1032 | new->sequence = counter; | |
2f74c0a0 | 1033 | INIT_LIST_HEAD(&new->list); |
4601df20 | 1034 | new->task = NULL; |
cee54fc9 TM |
1035 | } |
1036 | return new; | |
1037 | } | |
1038 | ||
72211dbe | 1039 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1040 | { |
4601df20 | 1041 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1042 | |
4601df20 TM |
1043 | if (list_empty(&seqid->list)) |
1044 | return; | |
1045 | sequence = seqid->sequence; | |
1046 | spin_lock(&sequence->lock); | |
1047 | list_del_init(&seqid->list); | |
1048 | if (!list_empty(&sequence->list)) { | |
1049 | struct nfs_seqid *next; | |
1050 | ||
1051 | next = list_first_entry(&sequence->list, | |
1052 | struct nfs_seqid, list); | |
1053 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1054 | } |
4601df20 | 1055 | spin_unlock(&sequence->lock); |
72211dbe TM |
1056 | } |
1057 | ||
1058 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1059 | { | |
1060 | nfs_release_seqid(seqid); | |
cee54fc9 | 1061 | kfree(seqid); |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | /* | |
cee54fc9 TM |
1065 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1066 | * failed with a seqid incrementing error - | |
1067 | * see comments nfs_fs.h:seqid_mutating_error() | |
1068 | */ | |
88d90939 | 1069 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1070 | { |
1071 | switch (status) { | |
1072 | case 0: | |
1073 | break; | |
1074 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1075 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1076 | return; | |
9a3ba432 | 1077 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1078 | " sequence-id error on an" |
1079 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1080 | seqid->sequence); |
cee54fc9 TM |
1081 | case -NFS4ERR_STALE_CLIENTID: |
1082 | case -NFS4ERR_STALE_STATEID: | |
1083 | case -NFS4ERR_BAD_STATEID: | |
1084 | case -NFS4ERR_BADXDR: | |
1085 | case -NFS4ERR_RESOURCE: | |
1086 | case -NFS4ERR_NOFILEHANDLE: | |
1087 | /* Non-seqid mutating errors */ | |
1088 | return; | |
1089 | }; | |
1090 | /* | |
1091 | * Note: no locking needed as we are guaranteed to be first | |
1092 | * on the sequence list | |
1093 | */ | |
1094 | seqid->sequence->counter++; | |
1095 | } | |
1096 | ||
1097 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1098 | { | |
34dc1ad7 BH |
1099 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1100 | struct nfs4_state_owner, so_seqid); | |
1101 | struct nfs_server *server = sp->so_server; | |
1102 | ||
1103 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1104 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1105 | if (!nfs4_has_session(server->nfs_client)) |
1106 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1107 | } |
1108 | ||
1109 | /* | |
cee54fc9 TM |
1110 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1111 | * failed with a seqid incrementing error - | |
1112 | * see comments nfs_fs.h:seqid_mutating_error() | |
1113 | */ | |
1114 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1115 | { | |
88d90939 | 1116 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1117 | } |
1118 | ||
1119 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1120 | { | |
7ba127ab | 1121 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1122 | int status = 0; |
1123 | ||
1124 | spin_lock(&sequence->lock); | |
4601df20 | 1125 | seqid->task = task; |
2f74c0a0 TM |
1126 | if (list_empty(&seqid->list)) |
1127 | list_add_tail(&seqid->list, &sequence->list); | |
1128 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1129 | goto unlock; | |
5d00837b | 1130 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1131 | status = -EAGAIN; |
1132 | unlock: | |
cee54fc9 TM |
1133 | spin_unlock(&sequence->lock); |
1134 | return status; | |
1da177e4 LT |
1135 | } |
1136 | ||
e005e804 | 1137 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1138 | |
e005e804 | 1139 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1140 | { |
1141 | smp_mb__before_clear_bit(); | |
e005e804 | 1142 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1143 | smp_mb__after_clear_bit(); |
e005e804 | 1144 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1145 | rpc_wake_up(&clp->cl_rpcwaitq); |
1146 | } | |
1147 | ||
1da177e4 | 1148 | /* |
e005e804 | 1149 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1150 | */ |
b0d3ded1 | 1151 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1152 | { |
5043e900 | 1153 | struct task_struct *task; |
2446ab60 | 1154 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1155 | |
e005e804 TM |
1156 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1157 | return; | |
5043e900 TM |
1158 | __module_get(THIS_MODULE); |
1159 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1160 | |
1161 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1162 | * manager is the only thread that ever changes the rpc_xprt | |
1163 | * after it's initialized. At this point, we're single threaded. */ | |
1164 | rcu_read_lock(); | |
1165 | snprintf(buf, sizeof(buf), "%s-manager", | |
1166 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1167 | rcu_read_unlock(); | |
f170168b | 1168 | task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
2446ab60 TM |
1169 | if (IS_ERR(task)) { |
1170 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1171 | __func__, PTR_ERR(task)); | |
1172 | nfs4_clear_state_manager_bit(clp); | |
1173 | nfs_put_client(clp); | |
1174 | module_put(THIS_MODULE); | |
1175 | } | |
1da177e4 LT |
1176 | } |
1177 | ||
1178 | /* | |
0400a6b0 | 1179 | * Schedule a lease recovery attempt |
1da177e4 | 1180 | */ |
0400a6b0 | 1181 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1182 | { |
1183 | if (!clp) | |
1184 | return; | |
e598d843 TM |
1185 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1186 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1187 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1188 | clp->cl_hostname); | |
e005e804 | 1189 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1190 | } |
9cb81968 | 1191 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1192 | |
33021279 TM |
1193 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1194 | { | |
1195 | int res; | |
1196 | ||
1197 | might_sleep(); | |
1198 | ||
1199 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, | |
1200 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1201 | if (res) | |
1202 | return res; | |
1203 | ||
1204 | if (clp->cl_cons_state < 0) | |
1205 | return clp->cl_cons_state; | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1210 | { | |
1211 | unsigned int loop; | |
1212 | int ret; | |
1213 | ||
1214 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1215 | ret = nfs4_wait_clnt_recover(clp); | |
1216 | if (ret != 0) | |
1217 | break; | |
1218 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1219 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1220 | break; | |
1221 | nfs4_schedule_state_manager(clp); | |
1222 | ret = -EIO; | |
1223 | } | |
1224 | return ret; | |
1225 | } | |
1226 | ||
ad1e3968 TM |
1227 | /* |
1228 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1229 | * @clp: client to process | |
1230 | * | |
1231 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1232 | * resend of the SETCLIENTID and hence re-establish the | |
1233 | * callback channel. Then return all existing delegations. | |
1234 | */ | |
1235 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1236 | { | |
1237 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1238 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1239 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1240 | clp->cl_hostname); | |
ad1e3968 TM |
1241 | } |
1242 | ||
042b60be TM |
1243 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1244 | { | |
ad1e3968 | 1245 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1246 | nfs4_schedule_state_manager(clp); |
1247 | } | |
1248 | ||
f9feab1e | 1249 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1250 | { |
1251 | ||
1252 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1253 | /* Don't recover state that expired before the reboot */ | |
1254 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1255 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1256 | return 0; | |
1257 | } | |
7eff03ae | 1258 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1259 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1260 | return 1; | |
1261 | } | |
1262 | ||
f9feab1e | 1263 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1264 | { |
1265 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1266 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1267 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1268 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1269 | return 1; | |
1270 | } | |
1271 | ||
5d422301 | 1272 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1273 | { |
1274 | struct nfs_client *clp = server->nfs_client; | |
1275 | ||
5d422301 TM |
1276 | if (!nfs4_valid_open_stateid(state)) |
1277 | return -EBADF; | |
0400a6b0 | 1278 | nfs4_state_mark_reclaim_nograce(clp, state); |
cc0a9843 TM |
1279 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1280 | clp->cl_hostname); | |
0400a6b0 | 1281 | nfs4_schedule_state_manager(clp); |
5d422301 | 1282 | return 0; |
0400a6b0 | 1283 | } |
9cb81968 | 1284 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1285 | |
a1d0b5ee TM |
1286 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1287 | const nfs4_stateid *stateid) | |
1288 | { | |
1289 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1290 | struct nfs_inode *nfsi = NFS_I(inode); | |
1291 | struct nfs_open_context *ctx; | |
1292 | struct nfs4_state *state; | |
1293 | bool found = false; | |
1294 | ||
1295 | spin_lock(&inode->i_lock); | |
1296 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1297 | state = ctx->state; | |
1298 | if (state == NULL) | |
1299 | continue; | |
1300 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1301 | continue; | |
f597c537 | 1302 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1303 | continue; |
1304 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1305 | found = true; | |
1306 | } | |
1307 | spin_unlock(&inode->i_lock); | |
1308 | if (found) | |
1309 | nfs4_schedule_state_manager(clp); | |
1310 | } | |
1311 | ||
c58c8441 TM |
1312 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1313 | { | |
1314 | struct inode *inode = state->inode; | |
1315 | struct nfs_inode *nfsi = NFS_I(inode); | |
1316 | struct nfs_open_context *ctx; | |
1317 | ||
1318 | spin_lock(&inode->i_lock); | |
1319 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1320 | if (ctx->state != state) | |
1321 | continue; | |
1322 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1323 | } | |
1324 | spin_unlock(&inode->i_lock); | |
1325 | } | |
1326 | ||
5d422301 TM |
1327 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1328 | { | |
1329 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1330 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1331 | } |
1332 | ||
a1d0b5ee | 1333 | |
02860014 | 1334 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1335 | { |
1336 | struct inode *inode = state->inode; | |
19e03c57 | 1337 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1338 | struct file_lock *fl; |
1339 | int status = 0; | |
1340 | ||
3f09df70 TM |
1341 | if (inode->i_flock == NULL) |
1342 | return 0; | |
1343 | ||
1344 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1345 | down_write(&nfsi->rwsem); |
3f09df70 | 1346 | /* Protect inode->i_flock using the BKL */ |
1c8c601a | 1347 | spin_lock(&inode->i_lock); |
90dc7d27 | 1348 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1349 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1350 | continue; |
cd3758e3 | 1351 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1352 | continue; |
1c8c601a | 1353 | spin_unlock(&inode->i_lock); |
1da177e4 | 1354 | status = ops->recover_lock(state, fl); |
1da177e4 | 1355 | switch (status) { |
965b5d67 TM |
1356 | case 0: |
1357 | break; | |
1358 | case -ESTALE: | |
1359 | case -NFS4ERR_ADMIN_REVOKED: | |
1360 | case -NFS4ERR_STALE_STATEID: | |
1361 | case -NFS4ERR_BAD_STATEID: | |
1362 | case -NFS4ERR_EXPIRED: | |
1363 | case -NFS4ERR_NO_GRACE: | |
1364 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1365 | case -NFS4ERR_BADSESSION: |
1366 | case -NFS4ERR_BADSLOT: | |
1367 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1368 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1369 | goto out; |
1da177e4 | 1370 | default: |
a030889a WAA |
1371 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1372 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1373 | case -ENOMEM: |
1374 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1375 | case -NFS4ERR_RECLAIM_BAD: |
1376 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1377 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1378 | status = 0; |
1da177e4 | 1379 | } |
1c8c601a | 1380 | spin_lock(&inode->i_lock); |
1da177e4 | 1381 | } |
1c8c601a | 1382 | spin_unlock(&inode->i_lock); |
965b5d67 | 1383 | out: |
19e03c57 | 1384 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1385 | return status; |
1386 | } | |
1387 | ||
02860014 | 1388 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1389 | { |
1390 | struct nfs4_state *state; | |
1391 | struct nfs4_lock_state *lock; | |
1392 | int status = 0; | |
1393 | ||
1394 | /* Note: we rely on the sp->so_states list being ordered | |
1395 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1396 | * states first. | |
1397 | * This is needed to ensure that the server won't give us any | |
1398 | * read delegations that we have to return if, say, we are | |
1399 | * recovering after a network partition or a reboot from a | |
1400 | * server that doesn't support a grace period. | |
1401 | */ | |
fe1d8195 | 1402 | spin_lock(&sp->so_lock); |
c137afab TM |
1403 | write_seqcount_begin(&sp->so_reclaim_seqcount); |
1404 | restart: | |
1da177e4 | 1405 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1406 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1407 | continue; | |
5d422301 TM |
1408 | if (!nfs4_valid_open_stateid(state)) |
1409 | continue; | |
1da177e4 LT |
1410 | if (state->state == 0) |
1411 | continue; | |
fe1d8195 TM |
1412 | atomic_inc(&state->count); |
1413 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1414 | status = ops->recover_open(sp, state); |
1da177e4 | 1415 | if (status >= 0) { |
02860014 TM |
1416 | status = nfs4_reclaim_locks(state, ops); |
1417 | if (status >= 0) { | |
4b44b40e | 1418 | spin_lock(&state->state_lock); |
02860014 | 1419 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
795a88c9 | 1420 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
96dcadc2 WD |
1421 | pr_warn_ratelimited("NFS: " |
1422 | "%s: Lock reclaim " | |
a030889a | 1423 | "failed!\n", __func__); |
02860014 | 1424 | } |
4b44b40e | 1425 | spin_unlock(&state->state_lock); |
fe1d8195 | 1426 | nfs4_put_open_state(state); |
c137afab | 1427 | spin_lock(&sp->so_lock); |
fe1d8195 | 1428 | goto restart; |
1da177e4 | 1429 | } |
1da177e4 LT |
1430 | } |
1431 | switch (status) { | |
1432 | default: | |
a030889a WAA |
1433 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1434 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1435 | case -ENOENT: |
965b5d67 | 1436 | case -ENOMEM: |
b79a4a1b | 1437 | case -ESTALE: |
1da177e4 LT |
1438 | /* |
1439 | * Open state on this file cannot be recovered | |
1440 | * All we can do is revert to using the zero stateid. | |
1441 | */ | |
5d422301 | 1442 | nfs4_state_mark_recovery_failed(state, status); |
1da177e4 | 1443 | break; |
91876b13 TM |
1444 | case -EAGAIN: |
1445 | ssleep(1); | |
965b5d67 TM |
1446 | case -NFS4ERR_ADMIN_REVOKED: |
1447 | case -NFS4ERR_STALE_STATEID: | |
1448 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1449 | case -NFS4ERR_RECLAIM_BAD: |
1450 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1451 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1452 | break; |
1da177e4 LT |
1453 | case -NFS4ERR_EXPIRED: |
1454 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1455 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1456 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1457 | case -NFS4ERR_BADSESSION: |
1458 | case -NFS4ERR_BADSLOT: | |
1459 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1460 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1461 | goto out_err; |
1462 | } | |
fe1d8195 | 1463 | nfs4_put_open_state(state); |
c137afab | 1464 | spin_lock(&sp->so_lock); |
fe1d8195 | 1465 | goto restart; |
1da177e4 | 1466 | } |
c137afab | 1467 | write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1468 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1469 | return 0; |
1470 | out_err: | |
fe1d8195 | 1471 | nfs4_put_open_state(state); |
c137afab TM |
1472 | spin_lock(&sp->so_lock); |
1473 | write_seqcount_end(&sp->so_reclaim_seqcount); | |
1474 | spin_unlock(&sp->so_lock); | |
1da177e4 LT |
1475 | return status; |
1476 | } | |
1477 | ||
b79a4a1b TM |
1478 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1479 | { | |
1480 | struct nfs4_lock_state *lock; | |
1481 | ||
1482 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1483 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1484 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1485 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1486 | spin_lock(&state->state_lock); |
b79a4a1b | 1487 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1488 | lock->ls_seqid.flags = 0; |
795a88c9 | 1489 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1490 | } |
4b44b40e | 1491 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1492 | } |
1493 | ||
24d292b8 CL |
1494 | static void nfs4_reset_seqids(struct nfs_server *server, |
1495 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1496 | { |
24d292b8 | 1497 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1498 | struct nfs4_state_owner *sp; |
9f958ab8 | 1499 | struct rb_node *pos; |
cee54fc9 | 1500 | struct nfs4_state *state; |
cee54fc9 | 1501 | |
24d292b8 CL |
1502 | spin_lock(&clp->cl_lock); |
1503 | for (pos = rb_first(&server->state_owners); | |
1504 | pos != NULL; | |
1505 | pos = rb_next(pos)) { | |
1506 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1507 | sp->so_seqid.flags = 0; |
ec073428 | 1508 | spin_lock(&sp->so_lock); |
cee54fc9 | 1509 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1510 | if (mark_reclaim(clp, state)) |
1511 | nfs4_clear_open_state(state); | |
cee54fc9 | 1512 | } |
ec073428 | 1513 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1514 | } |
24d292b8 CL |
1515 | spin_unlock(&clp->cl_lock); |
1516 | } | |
1517 | ||
1518 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1519 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1520 | { | |
1521 | struct nfs_server *server; | |
1522 | ||
1523 | rcu_read_lock(); | |
1524 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1525 | nfs4_reset_seqids(server, mark_reclaim); | |
1526 | rcu_read_unlock(); | |
cee54fc9 TM |
1527 | } |
1528 | ||
b79a4a1b TM |
1529 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1530 | { | |
1531 | /* Mark all delegations for reclaim */ | |
1532 | nfs_delegation_mark_reclaim(clp); | |
1533 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1534 | } | |
1535 | ||
fce5c838 | 1536 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 TM |
1537 | const struct nfs4_state_recovery_ops *ops, |
1538 | struct rpc_cred *cred) | |
fce5c838 RL |
1539 | { |
1540 | /* Notify the server we're done reclaiming our state */ | |
1541 | if (ops->reclaim_complete) | |
965e9c23 | 1542 | (void)ops->reclaim_complete(clp, cred); |
fce5c838 RL |
1543 | } |
1544 | ||
24d292b8 | 1545 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1546 | { |
24d292b8 | 1547 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1548 | struct nfs4_state_owner *sp; |
1549 | struct rb_node *pos; | |
1550 | struct nfs4_state *state; | |
1551 | ||
24d292b8 CL |
1552 | spin_lock(&clp->cl_lock); |
1553 | for (pos = rb_first(&server->state_owners); | |
1554 | pos != NULL; | |
1555 | pos = rb_next(pos)) { | |
1556 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1557 | spin_lock(&sp->so_lock); |
1558 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1559 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1560 | &state->flags)) | |
b79a4a1b TM |
1561 | continue; |
1562 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1563 | } | |
1564 | spin_unlock(&sp->so_lock); | |
1565 | } | |
24d292b8 CL |
1566 | spin_unlock(&clp->cl_lock); |
1567 | } | |
1568 | ||
1569 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1570 | { | |
1571 | struct nfs_server *server; | |
1572 | ||
1573 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1574 | return 0; | |
1575 | ||
1576 | rcu_read_lock(); | |
1577 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1578 | nfs4_clear_reclaim_server(server); | |
1579 | rcu_read_unlock(); | |
b79a4a1b TM |
1580 | |
1581 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1582 | return 1; |
1583 | } | |
1584 | ||
1585 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1586 | { | |
965e9c23 TM |
1587 | const struct nfs4_state_recovery_ops *ops; |
1588 | struct rpc_cred *cred; | |
1589 | ||
6eaa6149 TM |
1590 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1591 | return; | |
965e9c23 | 1592 | ops = clp->cl_mvops->reboot_recovery_ops; |
73d8bde5 | 1593 | cred = nfs4_get_clid_cred(clp); |
965e9c23 TM |
1594 | nfs4_reclaim_complete(clp, ops, cred); |
1595 | put_rpccred(cred); | |
b79a4a1b TM |
1596 | } |
1597 | ||
1598 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1599 | { | |
1600 | nfs_delegation_mark_reclaim(clp); | |
1601 | nfs_delegation_reap_unclaimed(clp); | |
1602 | } | |
1603 | ||
1604 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1605 | { | |
1606 | nfs_delegation_clear_all(clp); | |
1607 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1608 | } | |
1609 | ||
4f7cdf18 | 1610 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1611 | { |
1612 | switch (error) { | |
4f38e4aa TM |
1613 | case 0: |
1614 | break; | |
e598d843 | 1615 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1616 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1617 | break; |
c8b7ae3d TM |
1618 | case -NFS4ERR_NO_GRACE: |
1619 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1620 | break; |
e598d843 TM |
1621 | case -NFS4ERR_STALE_CLIENTID: |
1622 | case -NFS4ERR_LEASE_MOVED: | |
1623 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1624 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1625 | nfs4_state_start_reclaim_reboot(clp); |
1626 | break; | |
1627 | case -NFS4ERR_EXPIRED: | |
1628 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1629 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1630 | break; |
c3fad1b1 AA |
1631 | case -NFS4ERR_BADSESSION: |
1632 | case -NFS4ERR_BADSLOT: | |
1633 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1634 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1635 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1636 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1637 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1638 | /* Zero session reset errors */ |
4f38e4aa | 1639 | break; |
7c5d7256 TM |
1640 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1641 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1642 | break; | |
4f38e4aa | 1643 | default: |
cc0a9843 TM |
1644 | dprintk("%s: failed to handle error %d for server %s\n", |
1645 | __func__, error, clp->cl_hostname); | |
4f38e4aa | 1646 | return error; |
e598d843 | 1647 | } |
cc0a9843 TM |
1648 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1649 | clp->cl_hostname); | |
4f38e4aa | 1650 | return 0; |
e598d843 TM |
1651 | } |
1652 | ||
02860014 | 1653 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1654 | { |
24d292b8 CL |
1655 | struct nfs4_state_owner *sp; |
1656 | struct nfs_server *server; | |
9f958ab8 | 1657 | struct rb_node *pos; |
1da177e4 LT |
1658 | int status = 0; |
1659 | ||
7eff03ae | 1660 | restart: |
24d292b8 CL |
1661 | rcu_read_lock(); |
1662 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1663 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1664 | spin_lock(&clp->cl_lock); |
1665 | for (pos = rb_first(&server->state_owners); | |
1666 | pos != NULL; | |
1667 | pos = rb_next(pos)) { | |
1668 | sp = rb_entry(pos, | |
1669 | struct nfs4_state_owner, so_server_node); | |
1670 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1671 | &sp->so_flags)) | |
1672 | continue; | |
1673 | atomic_inc(&sp->so_count); | |
1674 | spin_unlock(&clp->cl_lock); | |
1675 | rcu_read_unlock(); | |
1676 | ||
1677 | status = nfs4_reclaim_open_state(sp, ops); | |
1678 | if (status < 0) { | |
1679 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1680 | nfs4_put_state_owner(sp); | |
1681 | return nfs4_recovery_handle_error(clp, status); | |
1682 | } | |
1683 | ||
7eff03ae | 1684 | nfs4_put_state_owner(sp); |
24d292b8 | 1685 | goto restart; |
7eff03ae | 1686 | } |
24d292b8 | 1687 | spin_unlock(&clp->cl_lock); |
02860014 | 1688 | } |
24d292b8 | 1689 | rcu_read_unlock(); |
02860014 TM |
1690 | return status; |
1691 | } | |
1692 | ||
1693 | static int nfs4_check_lease(struct nfs_client *clp) | |
1694 | { | |
1695 | struct rpc_cred *cred; | |
c48f4f35 TM |
1696 | const struct nfs4_state_maintenance_ops *ops = |
1697 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1698 | int status; |
1da177e4 | 1699 | |
0f605b56 TM |
1700 | /* Is the client already known to have an expired lease? */ |
1701 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1702 | return 0; | |
a7b72103 AA |
1703 | spin_lock(&clp->cl_lock); |
1704 | cred = ops->get_state_renewal_cred_locked(clp); | |
1705 | spin_unlock(&clp->cl_lock); | |
0f605b56 | 1706 | if (cred == NULL) { |
73d8bde5 | 1707 | cred = nfs4_get_clid_cred(clp); |
4f38e4aa | 1708 | status = -ENOKEY; |
0f605b56 TM |
1709 | if (cred == NULL) |
1710 | goto out; | |
286d7d6a | 1711 | } |
8e69514f | 1712 | status = ops->renew_lease(clp, cred); |
0f605b56 | 1713 | put_rpccred(cred); |
bc7a05ca TM |
1714 | if (status == -ETIMEDOUT) { |
1715 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1716 | return 0; | |
1717 | } | |
0f605b56 | 1718 | out: |
4f7cdf18 | 1719 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1720 | } |
1721 | ||
47b803c8 AA |
1722 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1723 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1724 | */ |
1725 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1726 | { | |
1727 | switch (status) { | |
89a21736 TM |
1728 | case -NFS4ERR_SEQ_MISORDERED: |
1729 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1730 | return -ESERVERFAULT; | |
1731 | /* Lease confirmation error: retry after purging the lease */ | |
1732 | ssleep(1); | |
47b803c8 AA |
1733 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1734 | break; | |
2a6ee6aa TM |
1735 | case -NFS4ERR_STALE_CLIENTID: |
1736 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 AA |
1737 | nfs4_state_clear_reclaim_reboot(clp); |
1738 | nfs4_state_start_reclaim_reboot(clp); | |
2a6ee6aa | 1739 | break; |
de734831 CL |
1740 | case -NFS4ERR_CLID_INUSE: |
1741 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1742 | clp->cl_hostname); | |
1743 | nfs_mark_client_ready(clp, -EPERM); | |
1744 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1745 | return -EPERM; | |
2a6ee6aa | 1746 | case -EACCES: |
2a6ee6aa TM |
1747 | case -NFS4ERR_DELAY: |
1748 | case -ETIMEDOUT: | |
1749 | case -EAGAIN: | |
1750 | ssleep(1); | |
1751 | break; | |
1752 | ||
1753 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1754 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1755 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1756 | dprintk("%s: exit with error %d for server %s\n", |
1757 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1758 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1759 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1760 | * in nfs4_exchange_id */ | |
1761 | default: | |
cc0a9843 TM |
1762 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1763 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1764 | return status; |
1765 | } | |
1766 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1767 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1768 | clp->cl_hostname); | |
2a6ee6aa TM |
1769 | return 0; |
1770 | } | |
1771 | ||
b42353ff | 1772 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 TM |
1773 | { |
1774 | struct rpc_cred *cred; | |
c48f4f35 TM |
1775 | const struct nfs4_state_recovery_ops *ops = |
1776 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1777 | int status; |
02860014 | 1778 | |
73d8bde5 | 1779 | cred = nfs4_get_clid_cred(clp); |
2a6ee6aa TM |
1780 | if (cred == NULL) |
1781 | return -ENOENT; | |
1782 | status = ops->establish_clid(clp, cred); | |
1783 | put_rpccred(cred); | |
1784 | if (status != 0) | |
b42353ff TM |
1785 | return status; |
1786 | pnfs_destroy_all_layouts(clp); | |
1787 | return 0; | |
1788 | } | |
1789 | ||
6bbb4ae8 CL |
1790 | /* |
1791 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1792 | * to local errno values. | |
1793 | */ | |
b42353ff TM |
1794 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1795 | { | |
1796 | int status; | |
1797 | ||
1798 | status = nfs4_establish_lease(clp); | |
1799 | if (status < 0) | |
1800 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1801 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
1802 | nfs4_state_start_reclaim_nograce(clp); | |
1803 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1804 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1805 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1806 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1807 | return 0; | |
1808 | } | |
1809 | ||
1810 | static int nfs4_purge_lease(struct nfs_client *clp) | |
1811 | { | |
1812 | int status; | |
1813 | ||
1814 | status = nfs4_establish_lease(clp); | |
1815 | if (status < 0) | |
2a6ee6aa | 1816 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
1817 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1818 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1819 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 1820 | return 0; |
02860014 TM |
1821 | } |
1822 | ||
05f4c350 CL |
1823 | /** |
1824 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
1825 | * | |
1826 | * @clp: nfs_client under test | |
1827 | * @result: OUT: found nfs_client, or clp | |
1828 | * | |
1829 | * Returns zero or a negative errno. If zero is returned, | |
1830 | * an nfs_client pointer is planted in "result". | |
1831 | * | |
1832 | * Note: since we are invoked in process context, and | |
1833 | * not from inside the state manager, we cannot use | |
1834 | * nfs4_handle_reclaim_lease_error(). | |
1835 | */ | |
1836 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
1837 | struct nfs_client **result) | |
1838 | { | |
1839 | const struct nfs4_state_recovery_ops *ops = | |
1840 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 CL |
1841 | struct rpc_clnt *clnt; |
1842 | struct rpc_cred *cred; | |
4edaa308 | 1843 | int i, status; |
05f4c350 CL |
1844 | |
1845 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
1846 | ||
05f4c350 | 1847 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
1848 | i = 0; |
1849 | ||
1850 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 1851 | again: |
ea33e6c3 | 1852 | status = -ENOENT; |
73d8bde5 | 1853 | cred = nfs4_get_clid_cred(clp); |
05f4c350 CL |
1854 | if (cred == NULL) |
1855 | goto out_unlock; | |
1856 | ||
1857 | status = ops->detect_trunking(clp, result, cred); | |
1858 | put_rpccred(cred); | |
1859 | switch (status) { | |
1860 | case 0: | |
1861 | break; | |
05f4c350 CL |
1862 | case -NFS4ERR_DELAY: |
1863 | case -ETIMEDOUT: | |
1864 | case -EAGAIN: | |
1865 | ssleep(1); | |
202c312d | 1866 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
1867 | dprintk("NFS: %s after status %d, retrying\n", |
1868 | __func__, status); | |
1869 | goto again; | |
4edaa308 | 1870 | case -EACCES: |
d688f7b8 CL |
1871 | if (i++ == 0) { |
1872 | nfs4_root_machine_cred(clp); | |
1873 | goto again; | |
1874 | } | |
1875 | if (i > 2) | |
4edaa308 | 1876 | break; |
05f4c350 CL |
1877 | case -NFS4ERR_CLID_INUSE: |
1878 | case -NFS4ERR_WRONGSEC: | |
79d852bf | 1879 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
1880 | if (IS_ERR(clnt)) { |
1881 | status = PTR_ERR(clnt); | |
1882 | break; | |
1883 | } | |
b193d59a TM |
1884 | /* Note: this is safe because we haven't yet marked the |
1885 | * client as ready, so we are the only user of | |
1886 | * clp->cl_rpcclient | |
1887 | */ | |
1888 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
1889 | rpc_shutdown_client(clnt); | |
1890 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
1891 | goto again; |
1892 | ||
1893 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1894 | status = -EPROTONOSUPPORT; | |
1895 | break; | |
1896 | ||
1897 | case -EKEYEXPIRED: | |
05f4c350 CL |
1898 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1899 | * in nfs4_exchange_id */ | |
1900 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
1901 | break; |
1902 | default: | |
1903 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
1904 | __func__, status); | |
1905 | status = -EIO; | |
05f4c350 CL |
1906 | } |
1907 | ||
1908 | out_unlock: | |
1909 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
1910 | dprintk("NFS: %s: status = %d\n", __func__, status); |
1911 | return status; | |
1912 | } | |
1913 | ||
76db6d95 | 1914 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1915 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1916 | { |
444f72fe TM |
1917 | struct nfs_client *clp = session->clp; |
1918 | ||
9f594791 TM |
1919 | switch (err) { |
1920 | default: | |
1921 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1922 | break; | |
1923 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1924 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1925 | } | |
444f72fe | 1926 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1927 | } |
cbdabc7f | 1928 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1929 | |
ac074835 TM |
1930 | static void nfs41_ping_server(struct nfs_client *clp) |
1931 | { | |
1932 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
1933 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1934 | nfs4_schedule_state_manager(clp); | |
1935 | } | |
1936 | ||
1937 | void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) | |
1938 | { | |
1939 | nfs41_ping_server(clp); | |
1940 | } | |
1941 | ||
c10e4498 TM |
1942 | void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
1943 | { | |
1944 | nfs41_ping_server(clp); | |
1945 | } | |
1946 | ||
0f79fd6f TM |
1947 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1948 | { | |
1949 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1950 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1951 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1952 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
1953 | dprintk("%s: scheduling reset of all state for server %s!\n", |
1954 | __func__, clp->cl_hostname); | |
0400a6b0 | 1955 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1956 | } |
1957 | } | |
1958 | ||
1959 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1960 | { | |
1961 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1962 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
1963 | dprintk("%s: server %s rebooted!\n", __func__, |
1964 | clp->cl_hostname); | |
0400a6b0 | 1965 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1966 | } |
1967 | } | |
1968 | ||
1969 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1970 | { | |
0f79fd6f | 1971 | nfs4_reset_all_state(clp); |
cc0a9843 | 1972 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
1973 | } |
1974 | ||
1975 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1976 | { | |
1977 | /* This will need to handle layouts too */ | |
1978 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1979 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
1980 | clp->cl_hostname); | |
0f79fd6f TM |
1981 | } |
1982 | ||
a9e64442 | 1983 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
1984 | { |
1985 | nfs_expire_all_delegations(clp); | |
1986 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1987 | nfs4_schedule_state_manager(clp); |
cc0a9843 TM |
1988 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
1989 | clp->cl_hostname); | |
0f79fd6f TM |
1990 | } |
1991 | ||
a9e64442 WAA |
1992 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
1993 | { | |
1994 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1995 | &clp->cl_state) == 0) | |
1996 | nfs4_schedule_state_manager(clp); | |
1997 | } | |
1998 | ||
0629e370 AB |
1999 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
2000 | { | |
2001 | if (!flags) | |
2002 | return; | |
2c820d9a CL |
2003 | |
2004 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2005 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
2006 | ||
111d489f | 2007 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2008 | nfs41_handle_server_reboot(clp); |
111d489f | 2009 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
2010 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
2011 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
2012 | SEQ4_STATUS_LEASE_MOVED)) |
2013 | nfs41_handle_state_revoked(clp); | |
111d489f | 2014 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2015 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
2016 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2017 | nfs41_handle_backchannel_fault(clp); | |
2018 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2019 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2020 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2021 | } |
2022 | ||
c3fad1b1 AA |
2023 | static int nfs4_reset_session(struct nfs_client *clp) |
2024 | { | |
848f5bda | 2025 | struct rpc_cred *cred; |
c3fad1b1 AA |
2026 | int status; |
2027 | ||
1a47e7a6 TM |
2028 | if (!nfs4_has_session(clp)) |
2029 | return 0; | |
38045412 | 2030 | nfs4_begin_drain_session(clp); |
73d8bde5 | 2031 | cred = nfs4_get_clid_cred(clp); |
848f5bda | 2032 | status = nfs4_proc_destroy_session(clp->cl_session, cred); |
c489ee29 TM |
2033 | switch (status) { |
2034 | case 0: | |
2035 | case -NFS4ERR_BADSESSION: | |
2036 | case -NFS4ERR_DEADSESSION: | |
2037 | break; | |
2038 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2039 | case -NFS4ERR_DELAY: | |
2040 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2041 | status = 0; | |
2042 | ssleep(1); | |
2043 | goto out; | |
2044 | default: | |
f455848a | 2045 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2046 | goto out; |
2047 | } | |
2048 | ||
2049 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2050 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2051 | if (status) { |
cc0a9843 TM |
2052 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2053 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2054 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2055 | goto out; |
2056 | } | |
bda197f5 | 2057 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2058 | dprintk("%s: session reset was successful for server %s!\n", |
2059 | __func__, clp->cl_hostname); | |
41f54a55 | 2060 | out: |
848f5bda TM |
2061 | if (cred) |
2062 | put_rpccred(cred); | |
c3fad1b1 AA |
2063 | return status; |
2064 | } | |
76db6d95 | 2065 | |
a9e64442 WAA |
2066 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2067 | { | |
2cf047c9 TM |
2068 | struct rpc_cred *cred; |
2069 | int ret; | |
2070 | ||
1a47e7a6 TM |
2071 | if (!nfs4_has_session(clp)) |
2072 | return 0; | |
43ac544c | 2073 | nfs4_begin_drain_session(clp); |
73d8bde5 | 2074 | cred = nfs4_get_clid_cred(clp); |
2cf047c9 TM |
2075 | ret = nfs4_proc_bind_conn_to_session(clp, cred); |
2076 | if (cred) | |
2077 | put_rpccred(cred); | |
43ac544c | 2078 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2079 | switch (ret) { |
2080 | case 0: | |
cc0a9843 TM |
2081 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2082 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2083 | break; |
2084 | case -NFS4ERR_DELAY: | |
2085 | ssleep(1); | |
2086 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2087 | break; | |
2088 | default: | |
2089 | return nfs4_recovery_handle_error(clp, ret); | |
2090 | } | |
2091 | return 0; | |
a9e64442 | 2092 | } |
76db6d95 | 2093 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2094 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
b14b7979 | 2095 | static void nfs4_end_drain_session(struct nfs_client *clp) { } |
a9e64442 WAA |
2096 | |
2097 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2098 | { | |
2099 | return 0; | |
2100 | } | |
76db6d95 AA |
2101 | #endif /* CONFIG_NFS_V4_1 */ |
2102 | ||
e005e804 | 2103 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2104 | { |
02860014 | 2105 | int status = 0; |
8ed27d4f | 2106 | const char *section = "", *section_sep = ""; |
02860014 | 2107 | |
02860014 | 2108 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2109 | do { |
2c820d9a | 2110 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2111 | section = "purge state"; |
b42353ff | 2112 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2113 | if (status < 0) |
2114 | goto out_error; | |
b42353ff | 2115 | continue; |
2c820d9a CL |
2116 | } |
2117 | ||
b42353ff | 2118 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2119 | section = "lease expired"; |
b79a4a1b TM |
2120 | /* We're going to have to re-establish a clientid */ |
2121 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2122 | if (status < 0) |
b79a4a1b | 2123 | goto out_error; |
b42353ff | 2124 | continue; |
e598d843 TM |
2125 | } |
2126 | ||
c3fad1b1 | 2127 | /* Initialize or reset the session */ |
1a47e7a6 | 2128 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2129 | section = "reset session"; |
4d643d1d | 2130 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2131 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2132 | continue; | |
2133 | if (status < 0) | |
76db6d95 | 2134 | goto out_error; |
76db6d95 | 2135 | } |
b6d408ba | 2136 | |
a9e64442 WAA |
2137 | /* Send BIND_CONN_TO_SESSION */ |
2138 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2139 | &clp->cl_state)) { |
8ed27d4f | 2140 | section = "bind conn to session"; |
a9e64442 WAA |
2141 | status = nfs4_bind_conn_to_session(clp); |
2142 | if (status < 0) | |
2143 | goto out_error; | |
bf674c82 | 2144 | continue; |
a9e64442 WAA |
2145 | } |
2146 | ||
5df904ae TM |
2147 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2148 | section = "check lease"; | |
2149 | status = nfs4_check_lease(clp); | |
2150 | if (status < 0) | |
2151 | goto out_error; | |
2152 | continue; | |
2153 | } | |
2154 | ||
b79a4a1b | 2155 | /* First recover reboot state... */ |
e345e88a | 2156 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2157 | section = "reclaim reboot"; |
591d71cb | 2158 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2159 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 2160 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2161 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 2162 | continue; |
b79a4a1b | 2163 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
2164 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
2165 | continue; | |
2166 | if (status < 0) | |
2167 | goto out_error; | |
02860014 TM |
2168 | } |
2169 | ||
b79a4a1b TM |
2170 | /* Now recover expired state... */ |
2171 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2172 | section = "reclaim nograce"; |
591d71cb | 2173 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2174 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 2175 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2176 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
2177 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
2178 | continue; | |
2179 | if (status < 0) | |
b79a4a1b | 2180 | goto out_error; |
1da177e4 | 2181 | } |
707fb4b3 | 2182 | |
5601a00d | 2183 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
2184 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
2185 | nfs_client_return_marked_delegations(clp); | |
2186 | continue; | |
2187 | } | |
e005e804 TM |
2188 | |
2189 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
2190 | /* Did we race with an attempt to give us more work? */ |
2191 | if (clp->cl_state == 0) | |
2192 | break; | |
2193 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
2194 | break; | |
47c2199b | 2195 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 2196 | return; |
1da177e4 | 2197 | out_error: |
8ed27d4f WAA |
2198 | if (strlen(section)) |
2199 | section_sep = ": "; | |
2200 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2201 | " with error %d\n", section_sep, section, | |
2202 | clp->cl_hostname, -status); | |
ffe5a830 | 2203 | ssleep(1); |
5601a00d | 2204 | nfs4_end_drain_session(clp); |
e005e804 TM |
2205 | nfs4_clear_state_manager_bit(clp); |
2206 | } | |
2207 | ||
2208 | static int nfs4_run_state_manager(void *ptr) | |
2209 | { | |
2210 | struct nfs_client *clp = ptr; | |
2211 | ||
2212 | allow_signal(SIGKILL); | |
2213 | nfs4_state_manager(clp); | |
2214 | nfs_put_client(clp); | |
2215 | module_put_and_exit(0); | |
2216 | return 0; | |
1da177e4 LT |
2217 | } |
2218 | ||
2219 | /* | |
2220 | * Local variables: | |
2221 | * c-basic-offset: 8 | |
2222 | * End: | |
2223 | */ |