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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/nfs/nfs4state.c | |
3 | * | |
4 | * Client-side XDR for NFSv4. | |
5 | * | |
6 | * Copyright (c) 2002 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Kendrick Smith <kmsmith@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | * | |
36 | * Implementation of the NFSv4 state model. For the time being, | |
37 | * this is minimal, but will be made much more complex in a | |
38 | * subsequent patch. | |
39 | */ | |
40 | ||
6f43ddcc | 41 | #include <linux/kernel.h> |
1da177e4 | 42 | #include <linux/slab.h> |
b89f4321 | 43 | #include <linux/fs.h> |
1da177e4 LT |
44 | #include <linux/nfs_fs.h> |
45 | #include <linux/nfs_idmap.h> | |
5043e900 TM |
46 | #include <linux/kthread.h> |
47 | #include <linux/module.h> | |
9f958ab8 | 48 | #include <linux/random.h> |
8c7597f6 | 49 | #include <linux/ratelimit.h> |
1da177e4 LT |
50 | #include <linux/workqueue.h> |
51 | #include <linux/bitops.h> | |
0aaaf5c4 | 52 | #include <linux/jiffies.h> |
1da177e4 | 53 | |
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 | ||
774d5f14 | 263 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 264 | { |
774d5f14 | 265 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 266 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 267 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
42acd021 | 268 | INIT_COMPLETION(tbl->complete); |
9dfdf404 | 269 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 270 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
271 | } |
272 | spin_unlock(&tbl->slot_tbl_lock); | |
273 | return 0; | |
274 | } | |
275 | ||
42acd021 AA |
276 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
277 | { | |
278 | struct nfs4_session *ses = clp->cl_session; | |
279 | int ret = 0; | |
280 | ||
42acd021 | 281 | /* back channel */ |
774d5f14 | 282 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
283 | if (ret) |
284 | return ret; | |
285 | /* fore channel */ | |
774d5f14 | 286 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
287 | } |
288 | ||
bda197f5 TM |
289 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
290 | { | |
291 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
292 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
293 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
294 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
295 | nfs41_setup_state_renewal(clp); | |
296 | } | |
297 | ||
4d643d1d AA |
298 | int nfs41_init_clientid(struct nfs_client *clp, struct rpc_cred *cred) |
299 | { | |
300 | int status; | |
301 | ||
fd954ae1 TM |
302 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
303 | goto do_confirm; | |
38045412 | 304 | nfs4_begin_drain_session(clp); |
4d643d1d | 305 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
306 | if (status != 0) |
307 | goto out; | |
fd954ae1 TM |
308 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
309 | do_confirm: | |
848f5bda | 310 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
311 | if (status != 0) |
312 | goto out; | |
bda197f5 | 313 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
314 | nfs_mark_client_ready(clp, NFS_CS_READY); |
315 | out: | |
4d643d1d AA |
316 | return status; |
317 | } | |
318 | ||
05f4c350 CL |
319 | /** |
320 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
321 | * | |
322 | * @clp: nfs_client under test | |
323 | * @result: OUT: found nfs_client, or clp | |
324 | * @cred: credential to use for trunking test | |
325 | * | |
326 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
327 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
328 | * "result". | |
329 | * | |
330 | * Note: The returned client may not yet be marked ready. | |
331 | */ | |
332 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
333 | struct nfs_client **result, | |
334 | struct rpc_cred *cred) | |
335 | { | |
336 | int status; | |
337 | ||
338 | status = nfs4_proc_exchange_id(clp, cred); | |
339 | if (status != NFS4_OK) | |
340 | return status; | |
fd483570 | 341 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
05f4c350 CL |
342 | |
343 | return nfs41_walk_client_list(clp, result, cred); | |
344 | } | |
345 | ||
b4b82607 AA |
346 | #endif /* CONFIG_NFS_V4_1 */ |
347 | ||
24d292b8 | 348 | /** |
73d8bde5 | 349 | * nfs4_get_clid_cred - Acquire credential for a setclientid operation |
24d292b8 CL |
350 | * @clp: client state handle |
351 | * | |
352 | * Returns an rpc_cred with reference count bumped, or NULL. | |
353 | */ | |
73d8bde5 | 354 | struct rpc_cred *nfs4_get_clid_cred(struct nfs_client *clp) |
24d292b8 | 355 | { |
a2b2bb88 | 356 | struct rpc_cred *cred; |
286d7d6a | 357 | |
6dc9d57a TM |
358 | spin_lock(&clp->cl_lock); |
359 | cred = nfs4_get_machine_cred_locked(clp); | |
24d292b8 | 360 | spin_unlock(&clp->cl_lock); |
a2b2bb88 | 361 | return cred; |
286d7d6a TM |
362 | } |
363 | ||
1da177e4 | 364 | static struct nfs4_state_owner * |
24d292b8 | 365 | nfs4_find_state_owner_locked(struct nfs_server *server, struct rpc_cred *cred) |
1da177e4 | 366 | { |
24d292b8 | 367 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 368 | *parent = NULL; |
414adf14 | 369 | struct nfs4_state_owner *sp; |
1da177e4 | 370 | |
9f958ab8 TM |
371 | while (*p != NULL) { |
372 | parent = *p; | |
24d292b8 | 373 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
374 | |
375 | if (cred < sp->so_cred) | |
376 | p = &parent->rb_left; | |
377 | else if (cred > sp->so_cred) | |
378 | p = &parent->rb_right; | |
379 | else { | |
0aaaf5c4 CL |
380 | if (!list_empty(&sp->so_lru)) |
381 | list_del_init(&sp->so_lru); | |
9f958ab8 | 382 | atomic_inc(&sp->so_count); |
414adf14 | 383 | return sp; |
9f958ab8 | 384 | } |
1da177e4 | 385 | } |
414adf14 | 386 | return NULL; |
1da177e4 LT |
387 | } |
388 | ||
9f958ab8 | 389 | static struct nfs4_state_owner * |
24d292b8 | 390 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 391 | { |
24d292b8 CL |
392 | struct nfs_server *server = new->so_server; |
393 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
394 | *parent = NULL; |
395 | struct nfs4_state_owner *sp; | |
9157c31d | 396 | int err; |
9f958ab8 TM |
397 | |
398 | while (*p != NULL) { | |
399 | parent = *p; | |
24d292b8 | 400 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
9f958ab8 TM |
401 | |
402 | if (new->so_cred < sp->so_cred) | |
403 | p = &parent->rb_left; | |
404 | else if (new->so_cred > sp->so_cred) | |
405 | p = &parent->rb_right; | |
406 | else { | |
0aaaf5c4 CL |
407 | if (!list_empty(&sp->so_lru)) |
408 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
409 | atomic_inc(&sp->so_count); |
410 | return sp; | |
411 | } | |
412 | } | |
48c22eb2 | 413 | err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id); |
9157c31d TM |
414 | if (err) |
415 | return ERR_PTR(err); | |
24d292b8 CL |
416 | rb_link_node(&new->so_server_node, parent, p); |
417 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
418 | return new; |
419 | } | |
420 | ||
421 | static void | |
24d292b8 | 422 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 423 | { |
24d292b8 CL |
424 | struct nfs_server *server = sp->so_server; |
425 | ||
426 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
427 | rb_erase(&sp->so_server_node, &server->state_owners); | |
48c22eb2 | 428 | ida_remove(&server->openowner_id, sp->so_seqid.owner_id); |
9f958ab8 TM |
429 | } |
430 | ||
7ba127ab TM |
431 | static void |
432 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
433 | { | |
95b72eb0 | 434 | sc->create_time = ktime_get(); |
7ba127ab TM |
435 | sc->flags = 0; |
436 | sc->counter = 0; | |
437 | spin_lock_init(&sc->lock); | |
438 | INIT_LIST_HEAD(&sc->list); | |
439 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
440 | } | |
441 | ||
442 | static void | |
443 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
444 | { | |
445 | rpc_destroy_wait_queue(&sc->wait); | |
446 | } | |
447 | ||
1da177e4 LT |
448 | /* |
449 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
450 | * create a new state_owner. | |
451 | * | |
452 | */ | |
453 | static struct nfs4_state_owner * | |
d1e284d5 TM |
454 | nfs4_alloc_state_owner(struct nfs_server *server, |
455 | struct rpc_cred *cred, | |
456 | gfp_t gfp_flags) | |
1da177e4 LT |
457 | { |
458 | struct nfs4_state_owner *sp; | |
459 | ||
d1e284d5 | 460 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
461 | if (!sp) |
462 | return NULL; | |
d1e284d5 TM |
463 | sp->so_server = server; |
464 | sp->so_cred = get_rpccred(cred); | |
ec073428 | 465 | spin_lock_init(&sp->so_lock); |
1da177e4 | 466 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 467 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 468 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 469 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 470 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 471 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
472 | return sp; |
473 | } | |
474 | ||
1d2e88e7 | 475 | static void |
1da177e4 LT |
476 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
477 | { | |
c77365c9 TM |
478 | struct rb_node *rb_node = &sp->so_server_node; |
479 | ||
480 | if (!RB_EMPTY_NODE(rb_node)) { | |
24d292b8 CL |
481 | struct nfs_server *server = sp->so_server; |
482 | struct nfs_client *clp = server->nfs_client; | |
9f958ab8 TM |
483 | |
484 | spin_lock(&clp->cl_lock); | |
c77365c9 TM |
485 | if (!RB_EMPTY_NODE(rb_node)) { |
486 | rb_erase(rb_node, &server->state_owners); | |
487 | RB_CLEAR_NODE(rb_node); | |
488 | } | |
9f958ab8 TM |
489 | spin_unlock(&clp->cl_lock); |
490 | } | |
1da177e4 LT |
491 | } |
492 | ||
0aaaf5c4 CL |
493 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
494 | { | |
7ba127ab | 495 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
0aaaf5c4 CL |
496 | put_rpccred(sp->so_cred); |
497 | kfree(sp); | |
498 | } | |
499 | ||
500 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
501 | { | |
502 | struct nfs_client *clp = server->nfs_client; | |
503 | struct nfs4_state_owner *sp, *tmp; | |
504 | unsigned long time_min, time_max; | |
505 | LIST_HEAD(doomed); | |
506 | ||
507 | spin_lock(&clp->cl_lock); | |
508 | time_max = jiffies; | |
509 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
510 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
511 | /* NB: LRU is sorted so that oldest is at the head */ | |
512 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
513 | break; | |
514 | list_move(&sp->so_lru, &doomed); | |
515 | nfs4_remove_state_owner_locked(sp); | |
516 | } | |
517 | spin_unlock(&clp->cl_lock); | |
518 | ||
519 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
520 | list_del(&sp->so_lru); | |
521 | nfs4_free_state_owner(sp); | |
522 | } | |
523 | } | |
524 | ||
24d292b8 CL |
525 | /** |
526 | * nfs4_get_state_owner - Look up a state owner given a credential | |
527 | * @server: nfs_server to search | |
528 | * @cred: RPC credential to match | |
529 | * | |
530 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
531 | */ | |
532 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
d1e284d5 TM |
533 | struct rpc_cred *cred, |
534 | gfp_t gfp_flags) | |
1da177e4 | 535 | { |
7539bbab | 536 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
537 | struct nfs4_state_owner *sp, *new; |
538 | ||
1da177e4 | 539 | spin_lock(&clp->cl_lock); |
24d292b8 | 540 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 541 | spin_unlock(&clp->cl_lock); |
1da177e4 | 542 | if (sp != NULL) |
0aaaf5c4 | 543 | goto out; |
d1e284d5 | 544 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 545 | if (new == NULL) |
0aaaf5c4 | 546 | goto out; |
9157c31d TM |
547 | do { |
548 | if (ida_pre_get(&server->openowner_id, gfp_flags) == 0) | |
549 | break; | |
550 | spin_lock(&clp->cl_lock); | |
551 | sp = nfs4_insert_state_owner_locked(new); | |
552 | spin_unlock(&clp->cl_lock); | |
553 | } while (sp == ERR_PTR(-EAGAIN)); | |
d1e284d5 TM |
554 | if (sp != new) |
555 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
556 | out: |
557 | nfs4_gc_state_owners(server); | |
9f958ab8 | 558 | return sp; |
1da177e4 LT |
559 | } |
560 | ||
24d292b8 CL |
561 | /** |
562 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
563 | * @sp: state owner data to release | |
7bf97bc2 TM |
564 | * |
565 | * Note that we keep released state owners on an LRU | |
566 | * list. | |
567 | * This caches valid state owners so that they can be | |
568 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
569 | * It also pins the uniquifier of dropped state owners for | |
570 | * a while, to ensure that those state owner names are | |
571 | * never reused. | |
24d292b8 | 572 | */ |
1da177e4 LT |
573 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
574 | { | |
0aaaf5c4 CL |
575 | struct nfs_server *server = sp->so_server; |
576 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
577 | |
578 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
579 | return; | |
0aaaf5c4 | 580 | |
7bf97bc2 TM |
581 | sp->so_expires = jiffies; |
582 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
583 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
584 | } |
585 | ||
586 | /** | |
587 | * nfs4_purge_state_owners - Release all cached state owners | |
588 | * @server: nfs_server with cached state owners to release | |
589 | * | |
590 | * Called at umount time. Remaining state owners will be on | |
591 | * the LRU with ref count of zero. | |
592 | */ | |
593 | void nfs4_purge_state_owners(struct nfs_server *server) | |
594 | { | |
595 | struct nfs_client *clp = server->nfs_client; | |
596 | struct nfs4_state_owner *sp, *tmp; | |
597 | LIST_HEAD(doomed); | |
598 | ||
599 | spin_lock(&clp->cl_lock); | |
600 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
601 | list_move(&sp->so_lru, &doomed); | |
602 | nfs4_remove_state_owner_locked(sp); | |
603 | } | |
1da177e4 | 604 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
605 | |
606 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
607 | list_del(&sp->so_lru); | |
608 | nfs4_free_state_owner(sp); | |
609 | } | |
1da177e4 LT |
610 | } |
611 | ||
612 | static struct nfs4_state * | |
613 | nfs4_alloc_open_state(void) | |
614 | { | |
615 | struct nfs4_state *state; | |
616 | ||
8535b2be | 617 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
618 | if (!state) |
619 | return NULL; | |
1da177e4 LT |
620 | atomic_set(&state->count, 1); |
621 | INIT_LIST_HEAD(&state->lock_states); | |
8d0a8a9d | 622 | spin_lock_init(&state->state_lock); |
8bda4e4c | 623 | seqlock_init(&state->seqlock); |
1da177e4 LT |
624 | return state; |
625 | } | |
626 | ||
4cecb76f | 627 | void |
dc0b027d | 628 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 629 | { |
dc0b027d | 630 | if (state->state == fmode) |
4cecb76f TM |
631 | return; |
632 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
633 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
634 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
635 | list_move(&state->open_states, &state->owner->so_states); |
636 | else | |
637 | list_move_tail(&state->open_states, &state->owner->so_states); | |
638 | } | |
dc0b027d | 639 | state->state = fmode; |
4cecb76f TM |
640 | } |
641 | ||
1da177e4 LT |
642 | static struct nfs4_state * |
643 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
644 | { | |
645 | struct nfs_inode *nfsi = NFS_I(inode); | |
646 | struct nfs4_state *state; | |
647 | ||
648 | list_for_each_entry(state, &nfsi->open_states, inode_states) { | |
1c816efa | 649 | if (state->owner != owner) |
1da177e4 | 650 | continue; |
5d422301 TM |
651 | if (!nfs4_valid_open_stateid(state)) |
652 | continue; | |
1c816efa | 653 | if (atomic_inc_not_zero(&state->count)) |
1da177e4 | 654 | return state; |
1da177e4 LT |
655 | } |
656 | return NULL; | |
657 | } | |
658 | ||
1da177e4 LT |
659 | static void |
660 | nfs4_free_open_state(struct nfs4_state *state) | |
661 | { | |
662 | kfree(state); | |
663 | } | |
664 | ||
665 | struct nfs4_state * | |
666 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
667 | { | |
668 | struct nfs4_state *state, *new; | |
669 | struct nfs_inode *nfsi = NFS_I(inode); | |
670 | ||
671 | spin_lock(&inode->i_lock); | |
672 | state = __nfs4_find_state_byowner(inode, owner); | |
673 | spin_unlock(&inode->i_lock); | |
674 | if (state) | |
675 | goto out; | |
676 | new = nfs4_alloc_open_state(); | |
ec073428 | 677 | spin_lock(&owner->so_lock); |
1da177e4 LT |
678 | spin_lock(&inode->i_lock); |
679 | state = __nfs4_find_state_byowner(inode, owner); | |
680 | if (state == NULL && new != NULL) { | |
681 | state = new; | |
1da177e4 LT |
682 | state->owner = owner; |
683 | atomic_inc(&owner->so_count); | |
684 | list_add(&state->inode_states, &nfsi->open_states); | |
0444d76a DC |
685 | ihold(inode); |
686 | state->inode = inode; | |
1da177e4 | 687 | spin_unlock(&inode->i_lock); |
ec073428 TM |
688 | /* Note: The reclaim code dictates that we add stateless |
689 | * and read-only stateids to the end of the list */ | |
690 | list_add_tail(&state->open_states, &owner->so_states); | |
691 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
692 | } else { |
693 | spin_unlock(&inode->i_lock); | |
ec073428 | 694 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
695 | if (new) |
696 | nfs4_free_open_state(new); | |
697 | } | |
698 | out: | |
699 | return state; | |
700 | } | |
701 | ||
1da177e4 LT |
702 | void nfs4_put_open_state(struct nfs4_state *state) |
703 | { | |
704 | struct inode *inode = state->inode; | |
705 | struct nfs4_state_owner *owner = state->owner; | |
706 | ||
ec073428 | 707 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 708 | return; |
ec073428 | 709 | spin_lock(&inode->i_lock); |
ba683031 | 710 | list_del(&state->inode_states); |
1da177e4 | 711 | list_del(&state->open_states); |
ec073428 TM |
712 | spin_unlock(&inode->i_lock); |
713 | spin_unlock(&owner->so_lock); | |
1da177e4 | 714 | iput(inode); |
1da177e4 LT |
715 | nfs4_free_open_state(state); |
716 | nfs4_put_state_owner(owner); | |
717 | } | |
718 | ||
719 | /* | |
83c9d41e | 720 | * Close the current file. |
1da177e4 | 721 | */ |
643168c2 | 722 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 723 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 724 | { |
1da177e4 | 725 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 726 | int call_close = 0; |
dc0b027d | 727 | fmode_t newstate; |
1da177e4 LT |
728 | |
729 | atomic_inc(&owner->so_count); | |
1da177e4 | 730 | /* Protect against nfs4_find_state() */ |
ec073428 | 731 | spin_lock(&owner->so_lock); |
dc0b027d | 732 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
733 | case FMODE_READ: |
734 | state->n_rdonly--; | |
735 | break; | |
736 | case FMODE_WRITE: | |
737 | state->n_wronly--; | |
738 | break; | |
739 | case FMODE_READ|FMODE_WRITE: | |
740 | state->n_rdwr--; | |
741 | } | |
003707c7 | 742 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 743 | if (state->n_rdwr == 0) { |
003707c7 | 744 | if (state->n_rdonly == 0) { |
e7616923 | 745 | newstate &= ~FMODE_READ; |
003707c7 TM |
746 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
747 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
748 | } | |
749 | if (state->n_wronly == 0) { | |
e7616923 | 750 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
751 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
752 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
753 | } | |
754 | if (newstate == 0) | |
755 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 756 | } |
003707c7 | 757 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 758 | spin_unlock(&owner->so_lock); |
4cecb76f | 759 | |
003707c7 | 760 | if (!call_close) { |
b39e625b TM |
761 | nfs4_put_open_state(state); |
762 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
763 | } else |
764 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
765 | } |
766 | ||
643168c2 | 767 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 768 | { |
643168c2 | 769 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
770 | } |
771 | ||
643168c2 | 772 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 773 | { |
643168c2 | 774 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
775 | } |
776 | ||
777 | /* | |
778 | * Search the state->lock_states for an existing lock_owner | |
779 | * that is compatible with current->files | |
780 | */ | |
781 | static struct nfs4_lock_state * | |
77041ed9 | 782 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner, pid_t fl_pid, unsigned int type) |
1da177e4 LT |
783 | { |
784 | struct nfs4_lock_state *pos; | |
785 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
77041ed9 | 786 | if (type != NFS4_ANY_LOCK_TYPE && pos->ls_owner.lo_type != type) |
1da177e4 | 787 | continue; |
77041ed9 TM |
788 | switch (pos->ls_owner.lo_type) { |
789 | case NFS4_POSIX_LOCK_TYPE: | |
790 | if (pos->ls_owner.lo_u.posix_owner != fl_owner) | |
791 | continue; | |
792 | break; | |
793 | case NFS4_FLOCK_LOCK_TYPE: | |
794 | if (pos->ls_owner.lo_u.flock_owner != fl_pid) | |
795 | continue; | |
796 | } | |
1da177e4 LT |
797 | atomic_inc(&pos->ls_count); |
798 | return pos; | |
799 | } | |
800 | return NULL; | |
801 | } | |
802 | ||
1da177e4 LT |
803 | /* |
804 | * Return a compatible lock_state. If no initialized lock_state structure | |
805 | * exists, return an uninitialized one. | |
806 | * | |
1da177e4 | 807 | */ |
77041ed9 | 808 | 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 |
809 | { |
810 | struct nfs4_lock_state *lsp; | |
24d292b8 | 811 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 812 | |
8535b2be | 813 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
814 | if (lsp == NULL) |
815 | return NULL; | |
7ba127ab | 816 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
1da177e4 | 817 | atomic_set(&lsp->ls_count, 1); |
b64aec8d | 818 | lsp->ls_state = state; |
77041ed9 TM |
819 | lsp->ls_owner.lo_type = type; |
820 | switch (lsp->ls_owner.lo_type) { | |
821 | case NFS4_FLOCK_LOCK_TYPE: | |
822 | lsp->ls_owner.lo_u.flock_owner = fl_pid; | |
823 | break; | |
824 | case NFS4_POSIX_LOCK_TYPE: | |
825 | lsp->ls_owner.lo_u.posix_owner = fl_owner; | |
826 | break; | |
827 | default: | |
d2d7ce28 | 828 | goto out_free; |
77041ed9 | 829 | } |
48c22eb2 TM |
830 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
831 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 832 | goto out_free; |
8d0a8a9d | 833 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 834 | return lsp; |
d2d7ce28 TM |
835 | out_free: |
836 | kfree(lsp); | |
837 | return NULL; | |
1da177e4 LT |
838 | } |
839 | ||
5ae67c4f | 840 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 841 | { |
48c22eb2 | 842 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 843 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
844 | kfree(lsp); |
845 | } | |
846 | ||
1da177e4 LT |
847 | /* |
848 | * Return a compatible lock_state. If no initialized lock_state structure | |
849 | * exists, return an uninitialized one. | |
850 | * | |
1da177e4 | 851 | */ |
77041ed9 | 852 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner, pid_t pid, unsigned int type) |
1da177e4 | 853 | { |
8d0a8a9d | 854 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 855 | |
8d0a8a9d TM |
856 | for(;;) { |
857 | spin_lock(&state->state_lock); | |
77041ed9 | 858 | lsp = __nfs4_find_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
859 | if (lsp != NULL) |
860 | break; | |
861 | if (new != NULL) { | |
8d0a8a9d TM |
862 | list_add(&new->ls_locks, &state->lock_states); |
863 | set_bit(LK_STATE_IN_USE, &state->flags); | |
864 | lsp = new; | |
865 | new = NULL; | |
866 | break; | |
867 | } | |
868 | spin_unlock(&state->state_lock); | |
77041ed9 | 869 | new = nfs4_alloc_lock_state(state, owner, pid, type); |
8d0a8a9d TM |
870 | if (new == NULL) |
871 | return NULL; | |
872 | } | |
873 | spin_unlock(&state->state_lock); | |
9f958ab8 | 874 | if (new != NULL) |
5ae67c4f | 875 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
876 | return lsp; |
877 | } | |
878 | ||
879 | /* | |
8d0a8a9d TM |
880 | * Release reference to lock_state, and free it if we see that |
881 | * it is no longer in use | |
1da177e4 | 882 | */ |
faf5f49c | 883 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 884 | { |
c8b2d0bf | 885 | struct nfs_server *server; |
8d0a8a9d | 886 | struct nfs4_state *state; |
1da177e4 | 887 | |
8d0a8a9d TM |
888 | if (lsp == NULL) |
889 | return; | |
890 | state = lsp->ls_state; | |
891 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) | |
892 | return; | |
893 | list_del(&lsp->ls_locks); | |
894 | if (list_empty(&state->lock_states)) | |
895 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
896 | spin_unlock(&state->state_lock); | |
c8b2d0bf | 897 | server = state->owner->so_server; |
795a88c9 | 898 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
c8b2d0bf TM |
899 | struct nfs_client *clp = server->nfs_client; |
900 | ||
901 | clp->cl_mvops->free_lock_state(server, lsp); | |
902 | } else | |
903 | nfs4_free_lock_state(server, lsp); | |
1da177e4 LT |
904 | } |
905 | ||
8d0a8a9d | 906 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 907 | { |
8d0a8a9d | 908 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 909 | |
8d0a8a9d TM |
910 | dst->fl_u.nfs4_fl.owner = lsp; |
911 | atomic_inc(&lsp->ls_count); | |
912 | } | |
1da177e4 | 913 | |
8d0a8a9d | 914 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 915 | { |
8d0a8a9d | 916 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
917 | } |
918 | ||
6aed6285 | 919 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
920 | .fl_copy_lock = nfs4_fl_copy_lock, |
921 | .fl_release_private = nfs4_fl_release_lock, | |
922 | }; | |
923 | ||
924 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 925 | { |
8d0a8a9d TM |
926 | struct nfs4_lock_state *lsp; |
927 | ||
928 | if (fl->fl_ops != NULL) | |
929 | return 0; | |
77041ed9 TM |
930 | if (fl->fl_flags & FL_POSIX) |
931 | lsp = nfs4_get_lock_state(state, fl->fl_owner, 0, NFS4_POSIX_LOCK_TYPE); | |
932 | else if (fl->fl_flags & FL_FLOCK) | |
17280175 TM |
933 | lsp = nfs4_get_lock_state(state, NULL, fl->fl_pid, |
934 | NFS4_FLOCK_LOCK_TYPE); | |
77041ed9 TM |
935 | else |
936 | return -EINVAL; | |
8d0a8a9d TM |
937 | if (lsp == NULL) |
938 | return -ENOMEM; | |
939 | fl->fl_u.nfs4_fl.owner = lsp; | |
940 | fl->fl_ops = &nfs4_fl_lock_ops; | |
941 | return 0; | |
1da177e4 LT |
942 | } |
943 | ||
5521abfd TM |
944 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
945 | struct nfs4_state *state, | |
2a369153 | 946 | const struct nfs_lockowner *lockowner) |
1da177e4 | 947 | { |
8d0a8a9d | 948 | struct nfs4_lock_state *lsp; |
2a369153 TM |
949 | fl_owner_t fl_owner; |
950 | pid_t fl_pid; | |
5521abfd | 951 | int ret = -ENOENT; |
1da177e4 | 952 | |
2a369153 TM |
953 | |
954 | if (lockowner == NULL) | |
955 | goto out; | |
956 | ||
8d0a8a9d | 957 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 958 | goto out; |
1da177e4 | 959 | |
2a369153 TM |
960 | fl_owner = lockowner->l_owner; |
961 | fl_pid = lockowner->l_pid; | |
8d0a8a9d | 962 | spin_lock(&state->state_lock); |
77041ed9 | 963 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_pid, NFS4_ANY_LOCK_TYPE); |
795a88c9 | 964 | if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
f597c537 | 965 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd TM |
966 | ret = 0; |
967 | smp_rmb(); | |
968 | if (!list_empty(&lsp->ls_seqid.list)) | |
969 | ret = -EWOULDBLOCK; | |
4fc8796d | 970 | } |
8d0a8a9d | 971 | spin_unlock(&state->state_lock); |
1da177e4 | 972 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
973 | out: |
974 | return ret; | |
975 | } | |
976 | ||
5521abfd | 977 | static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 978 | { |
92b40e93 | 979 | const nfs4_stateid *src; |
5521abfd | 980 | int ret; |
4fc8796d TM |
981 | int seq; |
982 | ||
983 | do { | |
92b40e93 | 984 | src = &zero_stateid; |
4fc8796d | 985 | seq = read_seqbegin(&state->seqlock); |
92b40e93 TM |
986 | if (test_bit(NFS_OPEN_STATE, &state->flags)) |
987 | src = &state->open_stateid; | |
988 | nfs4_stateid_copy(dst, src); | |
5521abfd TM |
989 | ret = 0; |
990 | smp_rmb(); | |
991 | if (!list_empty(&state->owner->so_seqid.list)) | |
992 | ret = -EWOULDBLOCK; | |
4fc8796d | 993 | } while (read_seqretry(&state->seqlock, seq)); |
5521abfd | 994 | return ret; |
4fc8796d TM |
995 | } |
996 | ||
997 | /* | |
998 | * Byte-range lock aware utility to initialize the stateid of read/write | |
999 | * requests. | |
1000 | */ | |
5521abfd | 1001 | int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state, |
2a369153 | 1002 | fmode_t fmode, const struct nfs_lockowner *lockowner) |
4fc8796d | 1003 | { |
5521abfd | 1004 | int ret = 0; |
4fc8796d | 1005 | if (nfs4_copy_delegation_stateid(dst, state->inode, fmode)) |
5521abfd TM |
1006 | goto out; |
1007 | ret = nfs4_copy_lock_stateid(dst, state, lockowner); | |
1008 | if (ret != -ENOENT) | |
1009 | goto out; | |
1010 | ret = nfs4_copy_open_stateid(dst, state); | |
1011 | out: | |
3b66486c TM |
1012 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1013 | dst->seqid = 0; | |
5521abfd | 1014 | return ret; |
1da177e4 LT |
1015 | } |
1016 | ||
8535b2be | 1017 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1018 | { |
cee54fc9 TM |
1019 | struct nfs_seqid *new; |
1020 | ||
8535b2be | 1021 | new = kmalloc(sizeof(*new), gfp_mask); |
cee54fc9 TM |
1022 | if (new != NULL) { |
1023 | new->sequence = counter; | |
2f74c0a0 | 1024 | INIT_LIST_HEAD(&new->list); |
4601df20 | 1025 | new->task = NULL; |
cee54fc9 TM |
1026 | } |
1027 | return new; | |
1028 | } | |
1029 | ||
72211dbe | 1030 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1031 | { |
4601df20 | 1032 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1033 | |
4601df20 TM |
1034 | if (list_empty(&seqid->list)) |
1035 | return; | |
1036 | sequence = seqid->sequence; | |
1037 | spin_lock(&sequence->lock); | |
1038 | list_del_init(&seqid->list); | |
1039 | if (!list_empty(&sequence->list)) { | |
1040 | struct nfs_seqid *next; | |
1041 | ||
1042 | next = list_first_entry(&sequence->list, | |
1043 | struct nfs_seqid, list); | |
1044 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1045 | } |
4601df20 | 1046 | spin_unlock(&sequence->lock); |
72211dbe TM |
1047 | } |
1048 | ||
1049 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1050 | { | |
1051 | nfs_release_seqid(seqid); | |
cee54fc9 | 1052 | kfree(seqid); |
1da177e4 LT |
1053 | } |
1054 | ||
1055 | /* | |
cee54fc9 TM |
1056 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1057 | * failed with a seqid incrementing error - | |
1058 | * see comments nfs_fs.h:seqid_mutating_error() | |
1059 | */ | |
88d90939 | 1060 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1061 | { |
1062 | switch (status) { | |
1063 | case 0: | |
1064 | break; | |
1065 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1066 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1067 | return; | |
9a3ba432 | 1068 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1069 | " sequence-id error on an" |
1070 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1071 | seqid->sequence); |
cee54fc9 TM |
1072 | case -NFS4ERR_STALE_CLIENTID: |
1073 | case -NFS4ERR_STALE_STATEID: | |
1074 | case -NFS4ERR_BAD_STATEID: | |
1075 | case -NFS4ERR_BADXDR: | |
1076 | case -NFS4ERR_RESOURCE: | |
1077 | case -NFS4ERR_NOFILEHANDLE: | |
1078 | /* Non-seqid mutating errors */ | |
1079 | return; | |
1080 | }; | |
1081 | /* | |
1082 | * Note: no locking needed as we are guaranteed to be first | |
1083 | * on the sequence list | |
1084 | */ | |
1085 | seqid->sequence->counter++; | |
1086 | } | |
1087 | ||
1088 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1089 | { | |
34dc1ad7 BH |
1090 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
1091 | struct nfs4_state_owner, so_seqid); | |
1092 | struct nfs_server *server = sp->so_server; | |
1093 | ||
1094 | if (status == -NFS4ERR_BAD_SEQID) | |
1da177e4 | 1095 | nfs4_drop_state_owner(sp); |
34dc1ad7 BH |
1096 | if (!nfs4_has_session(server->nfs_client)) |
1097 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1098 | } |
1099 | ||
1100 | /* | |
cee54fc9 TM |
1101 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1102 | * failed with a seqid incrementing error - | |
1103 | * see comments nfs_fs.h:seqid_mutating_error() | |
1104 | */ | |
1105 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1106 | { | |
88d90939 | 1107 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1108 | } |
1109 | ||
1110 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1111 | { | |
7ba127ab | 1112 | struct nfs_seqid_counter *sequence = seqid->sequence; |
cee54fc9 TM |
1113 | int status = 0; |
1114 | ||
1115 | spin_lock(&sequence->lock); | |
4601df20 | 1116 | seqid->task = task; |
2f74c0a0 TM |
1117 | if (list_empty(&seqid->list)) |
1118 | list_add_tail(&seqid->list, &sequence->list); | |
1119 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1120 | goto unlock; | |
5d00837b | 1121 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1122 | status = -EAGAIN; |
1123 | unlock: | |
cee54fc9 TM |
1124 | spin_unlock(&sequence->lock); |
1125 | return status; | |
1da177e4 LT |
1126 | } |
1127 | ||
e005e804 | 1128 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1129 | |
e005e804 | 1130 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c TM |
1131 | { |
1132 | smp_mb__before_clear_bit(); | |
e005e804 | 1133 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
433fbe4c | 1134 | smp_mb__after_clear_bit(); |
e005e804 | 1135 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1136 | rpc_wake_up(&clp->cl_rpcwaitq); |
1137 | } | |
1138 | ||
1da177e4 | 1139 | /* |
e005e804 | 1140 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1141 | */ |
b0d3ded1 | 1142 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1143 | { |
5043e900 | 1144 | struct task_struct *task; |
2446ab60 | 1145 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1146 | |
e005e804 TM |
1147 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1148 | return; | |
5043e900 TM |
1149 | __module_get(THIS_MODULE); |
1150 | atomic_inc(&clp->cl_count); | |
2446ab60 TM |
1151 | |
1152 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1153 | * manager is the only thread that ever changes the rpc_xprt | |
1154 | * after it's initialized. At this point, we're single threaded. */ | |
1155 | rcu_read_lock(); | |
1156 | snprintf(buf, sizeof(buf), "%s-manager", | |
1157 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1158 | rcu_read_unlock(); | |
f170168b | 1159 | task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
2446ab60 TM |
1160 | if (IS_ERR(task)) { |
1161 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1162 | __func__, PTR_ERR(task)); | |
1163 | nfs4_clear_state_manager_bit(clp); | |
1164 | nfs_put_client(clp); | |
1165 | module_put(THIS_MODULE); | |
1166 | } | |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | /* | |
0400a6b0 | 1170 | * Schedule a lease recovery attempt |
1da177e4 | 1171 | */ |
0400a6b0 | 1172 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1173 | { |
1174 | if (!clp) | |
1175 | return; | |
e598d843 TM |
1176 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1177 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1178 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1179 | clp->cl_hostname); | |
e005e804 | 1180 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1181 | } |
9cb81968 | 1182 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1183 | |
33021279 TM |
1184 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1185 | { | |
1186 | int res; | |
1187 | ||
1188 | might_sleep(); | |
1189 | ||
1190 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, | |
1191 | nfs_wait_bit_killable, TASK_KILLABLE); | |
1192 | if (res) | |
1193 | return res; | |
1194 | ||
1195 | if (clp->cl_cons_state < 0) | |
1196 | return clp->cl_cons_state; | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1201 | { | |
1202 | unsigned int loop; | |
1203 | int ret; | |
1204 | ||
1205 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1206 | ret = nfs4_wait_clnt_recover(clp); | |
1207 | if (ret != 0) | |
1208 | break; | |
1209 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1210 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1211 | break; | |
1212 | nfs4_schedule_state_manager(clp); | |
1213 | ret = -EIO; | |
1214 | } | |
1215 | return ret; | |
1216 | } | |
1217 | ||
ad1e3968 TM |
1218 | /* |
1219 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1220 | * @clp: client to process | |
1221 | * | |
1222 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1223 | * resend of the SETCLIENTID and hence re-establish the | |
1224 | * callback channel. Then return all existing delegations. | |
1225 | */ | |
1226 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1227 | { | |
1228 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1229 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1230 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1231 | clp->cl_hostname); | |
ad1e3968 TM |
1232 | } |
1233 | ||
042b60be TM |
1234 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1235 | { | |
ad1e3968 | 1236 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1237 | nfs4_schedule_state_manager(clp); |
1238 | } | |
1239 | ||
f9feab1e | 1240 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1241 | { |
1242 | ||
1243 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1244 | /* Don't recover state that expired before the reboot */ | |
1245 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1246 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1247 | return 0; | |
1248 | } | |
7eff03ae | 1249 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1250 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1251 | return 1; | |
1252 | } | |
1253 | ||
f9feab1e | 1254 | static int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1255 | { |
1256 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); | |
1257 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1258 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1259 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1260 | return 1; | |
1261 | } | |
1262 | ||
5d422301 | 1263 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1264 | { |
1265 | struct nfs_client *clp = server->nfs_client; | |
1266 | ||
5d422301 TM |
1267 | if (!nfs4_valid_open_stateid(state)) |
1268 | return -EBADF; | |
0400a6b0 | 1269 | nfs4_state_mark_reclaim_nograce(clp, state); |
cc0a9843 TM |
1270 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1271 | clp->cl_hostname); | |
0400a6b0 | 1272 | nfs4_schedule_state_manager(clp); |
5d422301 | 1273 | return 0; |
0400a6b0 | 1274 | } |
9cb81968 | 1275 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1276 | |
a1d0b5ee TM |
1277 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1278 | const nfs4_stateid *stateid) | |
1279 | { | |
1280 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1281 | struct nfs_inode *nfsi = NFS_I(inode); | |
1282 | struct nfs_open_context *ctx; | |
1283 | struct nfs4_state *state; | |
1284 | bool found = false; | |
1285 | ||
1286 | spin_lock(&inode->i_lock); | |
1287 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1288 | state = ctx->state; | |
1289 | if (state == NULL) | |
1290 | continue; | |
1291 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
1292 | continue; | |
f597c537 | 1293 | if (!nfs4_stateid_match(&state->stateid, stateid)) |
a1d0b5ee TM |
1294 | continue; |
1295 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1296 | found = true; | |
1297 | } | |
1298 | spin_unlock(&inode->i_lock); | |
1299 | if (found) | |
1300 | nfs4_schedule_state_manager(clp); | |
1301 | } | |
1302 | ||
c58c8441 TM |
1303 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1304 | { | |
1305 | struct inode *inode = state->inode; | |
1306 | struct nfs_inode *nfsi = NFS_I(inode); | |
1307 | struct nfs_open_context *ctx; | |
1308 | ||
1309 | spin_lock(&inode->i_lock); | |
1310 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
1311 | if (ctx->state != state) | |
1312 | continue; | |
1313 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1314 | } | |
1315 | spin_unlock(&inode->i_lock); | |
1316 | } | |
1317 | ||
5d422301 TM |
1318 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1319 | { | |
1320 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1321 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1322 | } |
1323 | ||
a1d0b5ee | 1324 | |
02860014 | 1325 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1326 | { |
1327 | struct inode *inode = state->inode; | |
19e03c57 | 1328 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 LT |
1329 | struct file_lock *fl; |
1330 | int status = 0; | |
1331 | ||
3f09df70 TM |
1332 | if (inode->i_flock == NULL) |
1333 | return 0; | |
1334 | ||
1335 | /* Guard against delegation returns and new lock/unlock calls */ | |
19e03c57 | 1336 | down_write(&nfsi->rwsem); |
3f09df70 | 1337 | /* Protect inode->i_flock using the BKL */ |
1c8c601a | 1338 | spin_lock(&inode->i_lock); |
90dc7d27 | 1339 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
43b2a33a | 1340 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
1da177e4 | 1341 | continue; |
cd3758e3 | 1342 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1da177e4 | 1343 | continue; |
1c8c601a | 1344 | spin_unlock(&inode->i_lock); |
1da177e4 | 1345 | status = ops->recover_lock(state, fl); |
1da177e4 | 1346 | switch (status) { |
965b5d67 TM |
1347 | case 0: |
1348 | break; | |
1349 | case -ESTALE: | |
1350 | case -NFS4ERR_ADMIN_REVOKED: | |
1351 | case -NFS4ERR_STALE_STATEID: | |
1352 | case -NFS4ERR_BAD_STATEID: | |
1353 | case -NFS4ERR_EXPIRED: | |
1354 | case -NFS4ERR_NO_GRACE: | |
1355 | case -NFS4ERR_STALE_CLIENTID: | |
9c4c761a TM |
1356 | case -NFS4ERR_BADSESSION: |
1357 | case -NFS4ERR_BADSLOT: | |
1358 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1359 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
965b5d67 | 1360 | goto out; |
1da177e4 | 1361 | default: |
a030889a WAA |
1362 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1363 | "Zeroing state\n", __func__, status); | |
965b5d67 TM |
1364 | case -ENOMEM: |
1365 | case -NFS4ERR_DENIED: | |
1da177e4 LT |
1366 | case -NFS4ERR_RECLAIM_BAD: |
1367 | case -NFS4ERR_RECLAIM_CONFLICT: | |
43b2a33a | 1368 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
965b5d67 | 1369 | status = 0; |
1da177e4 | 1370 | } |
1c8c601a | 1371 | spin_lock(&inode->i_lock); |
1da177e4 | 1372 | } |
1c8c601a | 1373 | spin_unlock(&inode->i_lock); |
965b5d67 | 1374 | out: |
19e03c57 | 1375 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1376 | return status; |
1377 | } | |
1378 | ||
02860014 | 1379 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1380 | { |
1381 | struct nfs4_state *state; | |
1382 | struct nfs4_lock_state *lock; | |
1383 | int status = 0; | |
1384 | ||
1385 | /* Note: we rely on the sp->so_states list being ordered | |
1386 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1387 | * states first. | |
1388 | * This is needed to ensure that the server won't give us any | |
1389 | * read delegations that we have to return if, say, we are | |
1390 | * recovering after a network partition or a reboot from a | |
1391 | * server that doesn't support a grace period. | |
1392 | */ | |
fe1d8195 | 1393 | spin_lock(&sp->so_lock); |
c137afab TM |
1394 | write_seqcount_begin(&sp->so_reclaim_seqcount); |
1395 | restart: | |
1da177e4 | 1396 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1397 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1398 | continue; | |
5d422301 TM |
1399 | if (!nfs4_valid_open_stateid(state)) |
1400 | continue; | |
1da177e4 LT |
1401 | if (state->state == 0) |
1402 | continue; | |
fe1d8195 TM |
1403 | atomic_inc(&state->count); |
1404 | spin_unlock(&sp->so_lock); | |
1da177e4 | 1405 | status = ops->recover_open(sp, state); |
1da177e4 | 1406 | if (status >= 0) { |
02860014 TM |
1407 | status = nfs4_reclaim_locks(state, ops); |
1408 | if (status >= 0) { | |
6686390b N |
1409 | if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0) { |
1410 | spin_lock(&state->state_lock); | |
1411 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1412 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) | |
1413 | pr_warn_ratelimited("NFS: " | |
1414 | "%s: Lock reclaim " | |
1415 | "failed!\n", __func__); | |
1416 | } | |
1417 | spin_unlock(&state->state_lock); | |
02860014 | 1418 | } |
fe1d8195 | 1419 | nfs4_put_open_state(state); |
c137afab | 1420 | spin_lock(&sp->so_lock); |
fe1d8195 | 1421 | goto restart; |
1da177e4 | 1422 | } |
1da177e4 LT |
1423 | } |
1424 | switch (status) { | |
1425 | default: | |
a030889a WAA |
1426 | printk(KERN_ERR "NFS: %s: unhandled error %d. " |
1427 | "Zeroing state\n", __func__, status); | |
1da177e4 | 1428 | case -ENOENT: |
965b5d67 | 1429 | case -ENOMEM: |
b79a4a1b | 1430 | case -ESTALE: |
1da177e4 LT |
1431 | /* |
1432 | * Open state on this file cannot be recovered | |
1433 | * All we can do is revert to using the zero stateid. | |
1434 | */ | |
5d422301 | 1435 | nfs4_state_mark_recovery_failed(state, status); |
1da177e4 | 1436 | break; |
91876b13 TM |
1437 | case -EAGAIN: |
1438 | ssleep(1); | |
965b5d67 TM |
1439 | case -NFS4ERR_ADMIN_REVOKED: |
1440 | case -NFS4ERR_STALE_STATEID: | |
1441 | case -NFS4ERR_BAD_STATEID: | |
b79a4a1b TM |
1442 | case -NFS4ERR_RECLAIM_BAD: |
1443 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1f0e890d | 1444 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
b79a4a1b | 1445 | break; |
1da177e4 LT |
1446 | case -NFS4ERR_EXPIRED: |
1447 | case -NFS4ERR_NO_GRACE: | |
1f0e890d | 1448 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
1da177e4 | 1449 | case -NFS4ERR_STALE_CLIENTID: |
9c4c761a TM |
1450 | case -NFS4ERR_BADSESSION: |
1451 | case -NFS4ERR_BADSLOT: | |
1452 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1453 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1da177e4 LT |
1454 | goto out_err; |
1455 | } | |
fe1d8195 | 1456 | nfs4_put_open_state(state); |
c137afab | 1457 | spin_lock(&sp->so_lock); |
fe1d8195 | 1458 | goto restart; |
1da177e4 | 1459 | } |
c137afab | 1460 | write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1461 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1462 | return 0; |
1463 | out_err: | |
fe1d8195 | 1464 | nfs4_put_open_state(state); |
c137afab TM |
1465 | spin_lock(&sp->so_lock); |
1466 | write_seqcount_end(&sp->so_reclaim_seqcount); | |
1467 | spin_unlock(&sp->so_lock); | |
1da177e4 LT |
1468 | return status; |
1469 | } | |
1470 | ||
b79a4a1b TM |
1471 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1472 | { | |
1473 | struct nfs4_lock_state *lock; | |
1474 | ||
1475 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1476 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1477 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1478 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1479 | spin_lock(&state->state_lock); |
b79a4a1b | 1480 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1481 | lock->ls_seqid.flags = 0; |
795a88c9 | 1482 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1483 | } |
4b44b40e | 1484 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1485 | } |
1486 | ||
24d292b8 CL |
1487 | static void nfs4_reset_seqids(struct nfs_server *server, |
1488 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1489 | { |
24d292b8 | 1490 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1491 | struct nfs4_state_owner *sp; |
9f958ab8 | 1492 | struct rb_node *pos; |
cee54fc9 | 1493 | struct nfs4_state *state; |
cee54fc9 | 1494 | |
24d292b8 CL |
1495 | spin_lock(&clp->cl_lock); |
1496 | for (pos = rb_first(&server->state_owners); | |
1497 | pos != NULL; | |
1498 | pos = rb_next(pos)) { | |
1499 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1500 | sp->so_seqid.flags = 0; |
ec073428 | 1501 | spin_lock(&sp->so_lock); |
cee54fc9 | 1502 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1503 | if (mark_reclaim(clp, state)) |
1504 | nfs4_clear_open_state(state); | |
cee54fc9 | 1505 | } |
ec073428 | 1506 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1507 | } |
24d292b8 CL |
1508 | spin_unlock(&clp->cl_lock); |
1509 | } | |
1510 | ||
1511 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1512 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1513 | { | |
1514 | struct nfs_server *server; | |
1515 | ||
1516 | rcu_read_lock(); | |
1517 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1518 | nfs4_reset_seqids(server, mark_reclaim); | |
1519 | rcu_read_unlock(); | |
cee54fc9 TM |
1520 | } |
1521 | ||
b79a4a1b TM |
1522 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1523 | { | |
1524 | /* Mark all delegations for reclaim */ | |
1525 | nfs_delegation_mark_reclaim(clp); | |
1526 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1527 | } | |
1528 | ||
fce5c838 | 1529 | static void nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 TM |
1530 | const struct nfs4_state_recovery_ops *ops, |
1531 | struct rpc_cred *cred) | |
fce5c838 RL |
1532 | { |
1533 | /* Notify the server we're done reclaiming our state */ | |
1534 | if (ops->reclaim_complete) | |
965e9c23 | 1535 | (void)ops->reclaim_complete(clp, cred); |
fce5c838 RL |
1536 | } |
1537 | ||
24d292b8 | 1538 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1539 | { |
24d292b8 | 1540 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1541 | struct nfs4_state_owner *sp; |
1542 | struct rb_node *pos; | |
1543 | struct nfs4_state *state; | |
1544 | ||
24d292b8 CL |
1545 | spin_lock(&clp->cl_lock); |
1546 | for (pos = rb_first(&server->state_owners); | |
1547 | pos != NULL; | |
1548 | pos = rb_next(pos)) { | |
1549 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1550 | spin_lock(&sp->so_lock); |
1551 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1552 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1553 | &state->flags)) | |
b79a4a1b TM |
1554 | continue; |
1555 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1556 | } | |
1557 | spin_unlock(&sp->so_lock); | |
1558 | } | |
24d292b8 CL |
1559 | spin_unlock(&clp->cl_lock); |
1560 | } | |
1561 | ||
1562 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1563 | { | |
1564 | struct nfs_server *server; | |
1565 | ||
1566 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1567 | return 0; | |
1568 | ||
1569 | rcu_read_lock(); | |
1570 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1571 | nfs4_clear_reclaim_server(server); | |
1572 | rcu_read_unlock(); | |
b79a4a1b TM |
1573 | |
1574 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1575 | return 1; |
1576 | } | |
1577 | ||
1578 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1579 | { | |
965e9c23 TM |
1580 | const struct nfs4_state_recovery_ops *ops; |
1581 | struct rpc_cred *cred; | |
1582 | ||
6eaa6149 TM |
1583 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1584 | return; | |
965e9c23 | 1585 | ops = clp->cl_mvops->reboot_recovery_ops; |
73d8bde5 | 1586 | cred = nfs4_get_clid_cred(clp); |
965e9c23 TM |
1587 | nfs4_reclaim_complete(clp, ops, cred); |
1588 | put_rpccred(cred); | |
b79a4a1b TM |
1589 | } |
1590 | ||
1591 | static void nfs_delegation_clear_all(struct nfs_client *clp) | |
1592 | { | |
1593 | nfs_delegation_mark_reclaim(clp); | |
1594 | nfs_delegation_reap_unclaimed(clp); | |
1595 | } | |
1596 | ||
1597 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) | |
1598 | { | |
1599 | nfs_delegation_clear_all(clp); | |
1600 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); | |
1601 | } | |
1602 | ||
4f7cdf18 | 1603 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1604 | { |
1605 | switch (error) { | |
4f38e4aa TM |
1606 | case 0: |
1607 | break; | |
e598d843 | 1608 | case -NFS4ERR_CB_PATH_DOWN: |
ad1e3968 | 1609 | nfs40_handle_cb_pathdown(clp); |
4f38e4aa | 1610 | break; |
c8b7ae3d TM |
1611 | case -NFS4ERR_NO_GRACE: |
1612 | nfs4_state_end_reclaim_reboot(clp); | |
4f38e4aa | 1613 | break; |
e598d843 TM |
1614 | case -NFS4ERR_STALE_CLIENTID: |
1615 | case -NFS4ERR_LEASE_MOVED: | |
1616 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
6eaa6149 | 1617 | nfs4_state_clear_reclaim_reboot(clp); |
e598d843 TM |
1618 | nfs4_state_start_reclaim_reboot(clp); |
1619 | break; | |
1620 | case -NFS4ERR_EXPIRED: | |
1621 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1622 | nfs4_state_start_reclaim_nograce(clp); | |
8ba9bf8e | 1623 | break; |
c3fad1b1 AA |
1624 | case -NFS4ERR_BADSESSION: |
1625 | case -NFS4ERR_BADSLOT: | |
1626 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1627 | case -NFS4ERR_DEADSESSION: | |
c3fad1b1 AA |
1628 | case -NFS4ERR_SEQ_FALSE_RETRY: |
1629 | case -NFS4ERR_SEQ_MISORDERED: | |
6df08189 | 1630 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
0b9e2d41 | 1631 | /* Zero session reset errors */ |
4f38e4aa | 1632 | break; |
7c5d7256 TM |
1633 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
1634 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1635 | break; | |
4f38e4aa | 1636 | default: |
cc0a9843 TM |
1637 | dprintk("%s: failed to handle error %d for server %s\n", |
1638 | __func__, error, clp->cl_hostname); | |
4f38e4aa | 1639 | return error; |
e598d843 | 1640 | } |
cc0a9843 TM |
1641 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1642 | clp->cl_hostname); | |
4f38e4aa | 1643 | return 0; |
e598d843 TM |
1644 | } |
1645 | ||
02860014 | 1646 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1647 | { |
24d292b8 CL |
1648 | struct nfs4_state_owner *sp; |
1649 | struct nfs_server *server; | |
9f958ab8 | 1650 | struct rb_node *pos; |
1da177e4 LT |
1651 | int status = 0; |
1652 | ||
7eff03ae | 1653 | restart: |
24d292b8 CL |
1654 | rcu_read_lock(); |
1655 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1656 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1657 | spin_lock(&clp->cl_lock); |
1658 | for (pos = rb_first(&server->state_owners); | |
1659 | pos != NULL; | |
1660 | pos = rb_next(pos)) { | |
1661 | sp = rb_entry(pos, | |
1662 | struct nfs4_state_owner, so_server_node); | |
1663 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1664 | &sp->so_flags)) | |
1665 | continue; | |
1666 | atomic_inc(&sp->so_count); | |
1667 | spin_unlock(&clp->cl_lock); | |
1668 | rcu_read_unlock(); | |
1669 | ||
1670 | status = nfs4_reclaim_open_state(sp, ops); | |
1671 | if (status < 0) { | |
1672 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1673 | nfs4_put_state_owner(sp); | |
1674 | return nfs4_recovery_handle_error(clp, status); | |
1675 | } | |
1676 | ||
7eff03ae | 1677 | nfs4_put_state_owner(sp); |
24d292b8 | 1678 | goto restart; |
7eff03ae | 1679 | } |
24d292b8 | 1680 | spin_unlock(&clp->cl_lock); |
02860014 | 1681 | } |
24d292b8 | 1682 | rcu_read_unlock(); |
02860014 TM |
1683 | return status; |
1684 | } | |
1685 | ||
1686 | static int nfs4_check_lease(struct nfs_client *clp) | |
1687 | { | |
1688 | struct rpc_cred *cred; | |
c48f4f35 TM |
1689 | const struct nfs4_state_maintenance_ops *ops = |
1690 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1691 | int status; |
1da177e4 | 1692 | |
0f605b56 TM |
1693 | /* Is the client already known to have an expired lease? */ |
1694 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1695 | return 0; | |
a7b72103 AA |
1696 | spin_lock(&clp->cl_lock); |
1697 | cred = ops->get_state_renewal_cred_locked(clp); | |
1698 | spin_unlock(&clp->cl_lock); | |
0f605b56 | 1699 | if (cred == NULL) { |
73d8bde5 | 1700 | cred = nfs4_get_clid_cred(clp); |
4f38e4aa | 1701 | status = -ENOKEY; |
0f605b56 TM |
1702 | if (cred == NULL) |
1703 | goto out; | |
286d7d6a | 1704 | } |
8e69514f | 1705 | status = ops->renew_lease(clp, cred); |
0f605b56 | 1706 | put_rpccred(cred); |
bc7a05ca TM |
1707 | if (status == -ETIMEDOUT) { |
1708 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1709 | return 0; | |
1710 | } | |
0f605b56 | 1711 | out: |
4f7cdf18 | 1712 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1713 | } |
1714 | ||
47b803c8 AA |
1715 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1716 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1717 | */ |
1718 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1719 | { | |
1720 | switch (status) { | |
89a21736 TM |
1721 | case -NFS4ERR_SEQ_MISORDERED: |
1722 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1723 | return -ESERVERFAULT; | |
1724 | /* Lease confirmation error: retry after purging the lease */ | |
1725 | ssleep(1); | |
47b803c8 AA |
1726 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1727 | break; | |
2a6ee6aa TM |
1728 | case -NFS4ERR_STALE_CLIENTID: |
1729 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 AA |
1730 | nfs4_state_clear_reclaim_reboot(clp); |
1731 | nfs4_state_start_reclaim_reboot(clp); | |
2a6ee6aa | 1732 | break; |
de734831 CL |
1733 | case -NFS4ERR_CLID_INUSE: |
1734 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1735 | clp->cl_hostname); | |
1736 | nfs_mark_client_ready(clp, -EPERM); | |
1737 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1738 | return -EPERM; | |
2a6ee6aa | 1739 | case -EACCES: |
2a6ee6aa TM |
1740 | case -NFS4ERR_DELAY: |
1741 | case -ETIMEDOUT: | |
1742 | case -EAGAIN: | |
1743 | ssleep(1); | |
1744 | break; | |
1745 | ||
1746 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1747 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1748 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1749 | dprintk("%s: exit with error %d for server %s\n", |
1750 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1751 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1752 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1753 | * in nfs4_exchange_id */ | |
1754 | default: | |
cc0a9843 TM |
1755 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1756 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1757 | return status; |
1758 | } | |
1759 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1760 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1761 | clp->cl_hostname); | |
2a6ee6aa TM |
1762 | return 0; |
1763 | } | |
1764 | ||
b42353ff | 1765 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 TM |
1766 | { |
1767 | struct rpc_cred *cred; | |
c48f4f35 TM |
1768 | const struct nfs4_state_recovery_ops *ops = |
1769 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1770 | int status; |
02860014 | 1771 | |
73d8bde5 | 1772 | cred = nfs4_get_clid_cred(clp); |
2a6ee6aa TM |
1773 | if (cred == NULL) |
1774 | return -ENOENT; | |
1775 | status = ops->establish_clid(clp, cred); | |
1776 | put_rpccred(cred); | |
1777 | if (status != 0) | |
b42353ff TM |
1778 | return status; |
1779 | pnfs_destroy_all_layouts(clp); | |
1780 | return 0; | |
1781 | } | |
1782 | ||
6bbb4ae8 CL |
1783 | /* |
1784 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1785 | * to local errno values. | |
1786 | */ | |
b42353ff TM |
1787 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1788 | { | |
1789 | int status; | |
1790 | ||
1791 | status = nfs4_establish_lease(clp); | |
1792 | if (status < 0) | |
1793 | return nfs4_handle_reclaim_lease_error(clp, status); | |
1794 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
1795 | nfs4_state_start_reclaim_nograce(clp); | |
1796 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
1797 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
1798 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1799 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | static int nfs4_purge_lease(struct nfs_client *clp) | |
1804 | { | |
1805 | int status; | |
1806 | ||
1807 | status = nfs4_establish_lease(clp); | |
1808 | if (status < 0) | |
2a6ee6aa | 1809 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
1810 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
1811 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1812 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 1813 | return 0; |
02860014 TM |
1814 | } |
1815 | ||
05f4c350 CL |
1816 | /** |
1817 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
1818 | * | |
1819 | * @clp: nfs_client under test | |
1820 | * @result: OUT: found nfs_client, or clp | |
1821 | * | |
1822 | * Returns zero or a negative errno. If zero is returned, | |
1823 | * an nfs_client pointer is planted in "result". | |
1824 | * | |
1825 | * Note: since we are invoked in process context, and | |
1826 | * not from inside the state manager, we cannot use | |
1827 | * nfs4_handle_reclaim_lease_error(). | |
1828 | */ | |
1829 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
1830 | struct nfs_client **result) | |
1831 | { | |
1832 | const struct nfs4_state_recovery_ops *ops = | |
1833 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 CL |
1834 | struct rpc_clnt *clnt; |
1835 | struct rpc_cred *cred; | |
4edaa308 | 1836 | int i, status; |
05f4c350 CL |
1837 | |
1838 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
1839 | ||
05f4c350 | 1840 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
1841 | i = 0; |
1842 | ||
1843 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 1844 | again: |
ea33e6c3 | 1845 | status = -ENOENT; |
73d8bde5 | 1846 | cred = nfs4_get_clid_cred(clp); |
05f4c350 CL |
1847 | if (cred == NULL) |
1848 | goto out_unlock; | |
1849 | ||
1850 | status = ops->detect_trunking(clp, result, cred); | |
1851 | put_rpccred(cred); | |
1852 | switch (status) { | |
1853 | case 0: | |
1854 | break; | |
05f4c350 CL |
1855 | case -NFS4ERR_DELAY: |
1856 | case -ETIMEDOUT: | |
1857 | case -EAGAIN: | |
1858 | ssleep(1); | |
202c312d | 1859 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
1860 | dprintk("NFS: %s after status %d, retrying\n", |
1861 | __func__, status); | |
1862 | goto again; | |
4edaa308 | 1863 | case -EACCES: |
d688f7b8 CL |
1864 | if (i++ == 0) { |
1865 | nfs4_root_machine_cred(clp); | |
1866 | goto again; | |
1867 | } | |
1868 | if (i > 2) | |
4edaa308 | 1869 | break; |
05f4c350 CL |
1870 | case -NFS4ERR_CLID_INUSE: |
1871 | case -NFS4ERR_WRONGSEC: | |
79d852bf | 1872 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
1873 | if (IS_ERR(clnt)) { |
1874 | status = PTR_ERR(clnt); | |
1875 | break; | |
1876 | } | |
b193d59a TM |
1877 | /* Note: this is safe because we haven't yet marked the |
1878 | * client as ready, so we are the only user of | |
1879 | * clp->cl_rpcclient | |
1880 | */ | |
1881 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
1882 | rpc_shutdown_client(clnt); | |
1883 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
1884 | goto again; |
1885 | ||
1886 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1887 | status = -EPROTONOSUPPORT; | |
1888 | break; | |
1889 | ||
1890 | case -EKEYEXPIRED: | |
05f4c350 CL |
1891 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1892 | * in nfs4_exchange_id */ | |
1893 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
1894 | break; |
1895 | default: | |
1896 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
1897 | __func__, status); | |
1898 | status = -EIO; | |
05f4c350 CL |
1899 | } |
1900 | ||
1901 | out_unlock: | |
1902 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
1903 | dprintk("NFS: %s: status = %d\n", __func__, status); |
1904 | return status; | |
1905 | } | |
1906 | ||
76db6d95 | 1907 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 1908 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 1909 | { |
444f72fe TM |
1910 | struct nfs_client *clp = session->clp; |
1911 | ||
9f594791 TM |
1912 | switch (err) { |
1913 | default: | |
1914 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1915 | break; | |
1916 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1917 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1918 | } | |
444f72fe | 1919 | nfs4_schedule_lease_recovery(clp); |
0400a6b0 | 1920 | } |
cbdabc7f | 1921 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 1922 | |
ac074835 TM |
1923 | static void nfs41_ping_server(struct nfs_client *clp) |
1924 | { | |
1925 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
1926 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1927 | nfs4_schedule_state_manager(clp); | |
1928 | } | |
1929 | ||
1930 | void nfs41_server_notify_target_slotid_update(struct nfs_client *clp) | |
1931 | { | |
1932 | nfs41_ping_server(clp); | |
1933 | } | |
1934 | ||
c10e4498 TM |
1935 | void nfs41_server_notify_highest_slotid_update(struct nfs_client *clp) |
1936 | { | |
1937 | nfs41_ping_server(clp); | |
1938 | } | |
1939 | ||
0f79fd6f TM |
1940 | static void nfs4_reset_all_state(struct nfs_client *clp) |
1941 | { | |
1942 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 1943 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 1944 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 1945 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
1946 | dprintk("%s: scheduling reset of all state for server %s!\n", |
1947 | __func__, clp->cl_hostname); | |
0400a6b0 | 1948 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1949 | } |
1950 | } | |
1951 | ||
1952 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
1953 | { | |
1954 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
1955 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
1956 | dprintk("%s: server %s rebooted!\n", __func__, |
1957 | clp->cl_hostname); | |
0400a6b0 | 1958 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
1959 | } |
1960 | } | |
1961 | ||
1962 | static void nfs41_handle_state_revoked(struct nfs_client *clp) | |
1963 | { | |
0f79fd6f | 1964 | nfs4_reset_all_state(clp); |
cc0a9843 | 1965 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
1966 | } |
1967 | ||
1968 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) | |
1969 | { | |
1970 | /* This will need to handle layouts too */ | |
1971 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1972 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
1973 | clp->cl_hostname); | |
0f79fd6f TM |
1974 | } |
1975 | ||
a9e64442 | 1976 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f TM |
1977 | { |
1978 | nfs_expire_all_delegations(clp); | |
1979 | if (test_and_set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) == 0) | |
0400a6b0 | 1980 | nfs4_schedule_state_manager(clp); |
cc0a9843 TM |
1981 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
1982 | clp->cl_hostname); | |
0f79fd6f TM |
1983 | } |
1984 | ||
a9e64442 WAA |
1985 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
1986 | { | |
1987 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1988 | &clp->cl_state) == 0) | |
1989 | nfs4_schedule_state_manager(clp); | |
1990 | } | |
1991 | ||
0629e370 AB |
1992 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags) |
1993 | { | |
1994 | if (!flags) | |
1995 | return; | |
2c820d9a CL |
1996 | |
1997 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
1998 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
1999 | ||
111d489f | 2000 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2001 | nfs41_handle_server_reboot(clp); |
111d489f | 2002 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED | |
0629e370 AB |
2003 | SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
2004 | SEQ4_STATUS_ADMIN_STATE_REVOKED | | |
0f79fd6f TM |
2005 | SEQ4_STATUS_LEASE_MOVED)) |
2006 | nfs41_handle_state_revoked(clp); | |
111d489f | 2007 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2008 | nfs41_handle_recallable_state_revoked(clp); |
a9e64442 WAA |
2009 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2010 | nfs41_handle_backchannel_fault(clp); | |
2011 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2012 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2013 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2014 | } |
2015 | ||
c3fad1b1 AA |
2016 | static int nfs4_reset_session(struct nfs_client *clp) |
2017 | { | |
848f5bda | 2018 | struct rpc_cred *cred; |
c3fad1b1 AA |
2019 | int status; |
2020 | ||
1a47e7a6 TM |
2021 | if (!nfs4_has_session(clp)) |
2022 | return 0; | |
38045412 | 2023 | nfs4_begin_drain_session(clp); |
73d8bde5 | 2024 | cred = nfs4_get_clid_cred(clp); |
848f5bda | 2025 | status = nfs4_proc_destroy_session(clp->cl_session, cred); |
c489ee29 TM |
2026 | switch (status) { |
2027 | case 0: | |
2028 | case -NFS4ERR_BADSESSION: | |
2029 | case -NFS4ERR_DEADSESSION: | |
2030 | break; | |
2031 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2032 | case -NFS4ERR_DELAY: | |
2033 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2034 | status = 0; | |
2035 | ssleep(1); | |
2036 | goto out; | |
2037 | default: | |
f455848a | 2038 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2039 | goto out; |
2040 | } | |
2041 | ||
2042 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2043 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2044 | if (status) { |
cc0a9843 TM |
2045 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2046 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2047 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2048 | goto out; |
2049 | } | |
bda197f5 | 2050 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2051 | dprintk("%s: session reset was successful for server %s!\n", |
2052 | __func__, clp->cl_hostname); | |
41f54a55 | 2053 | out: |
848f5bda TM |
2054 | if (cred) |
2055 | put_rpccred(cred); | |
c3fad1b1 AA |
2056 | return status; |
2057 | } | |
76db6d95 | 2058 | |
a9e64442 WAA |
2059 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2060 | { | |
2cf047c9 TM |
2061 | struct rpc_cred *cred; |
2062 | int ret; | |
2063 | ||
1a47e7a6 TM |
2064 | if (!nfs4_has_session(clp)) |
2065 | return 0; | |
43ac544c | 2066 | nfs4_begin_drain_session(clp); |
73d8bde5 | 2067 | cred = nfs4_get_clid_cred(clp); |
2cf047c9 TM |
2068 | ret = nfs4_proc_bind_conn_to_session(clp, cred); |
2069 | if (cred) | |
2070 | put_rpccred(cred); | |
43ac544c | 2071 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2072 | switch (ret) { |
2073 | case 0: | |
cc0a9843 TM |
2074 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2075 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2076 | break; |
2077 | case -NFS4ERR_DELAY: | |
2078 | ssleep(1); | |
2079 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2080 | break; | |
2081 | default: | |
2082 | return nfs4_recovery_handle_error(clp, ret); | |
2083 | } | |
2084 | return 0; | |
a9e64442 | 2085 | } |
76db6d95 | 2086 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2087 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
b14b7979 | 2088 | static void nfs4_end_drain_session(struct nfs_client *clp) { } |
a9e64442 WAA |
2089 | |
2090 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2091 | { | |
2092 | return 0; | |
2093 | } | |
76db6d95 AA |
2094 | #endif /* CONFIG_NFS_V4_1 */ |
2095 | ||
e005e804 | 2096 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2097 | { |
02860014 | 2098 | int status = 0; |
8ed27d4f | 2099 | const char *section = "", *section_sep = ""; |
02860014 | 2100 | |
02860014 | 2101 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2102 | do { |
2c820d9a | 2103 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2104 | section = "purge state"; |
b42353ff | 2105 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2106 | if (status < 0) |
2107 | goto out_error; | |
b42353ff | 2108 | continue; |
2c820d9a CL |
2109 | } |
2110 | ||
b42353ff | 2111 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2112 | section = "lease expired"; |
b79a4a1b TM |
2113 | /* We're going to have to re-establish a clientid */ |
2114 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2115 | if (status < 0) |
b79a4a1b | 2116 | goto out_error; |
b42353ff | 2117 | continue; |
e598d843 TM |
2118 | } |
2119 | ||
c3fad1b1 | 2120 | /* Initialize or reset the session */ |
1a47e7a6 | 2121 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2122 | section = "reset session"; |
4d643d1d | 2123 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2124 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2125 | continue; | |
2126 | if (status < 0) | |
76db6d95 | 2127 | goto out_error; |
76db6d95 | 2128 | } |
b6d408ba | 2129 | |
a9e64442 WAA |
2130 | /* Send BIND_CONN_TO_SESSION */ |
2131 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2132 | &clp->cl_state)) { |
8ed27d4f | 2133 | section = "bind conn to session"; |
a9e64442 WAA |
2134 | status = nfs4_bind_conn_to_session(clp); |
2135 | if (status < 0) | |
2136 | goto out_error; | |
bf674c82 | 2137 | continue; |
a9e64442 WAA |
2138 | } |
2139 | ||
5df904ae TM |
2140 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2141 | section = "check lease"; | |
2142 | status = nfs4_check_lease(clp); | |
2143 | if (status < 0) | |
2144 | goto out_error; | |
2145 | continue; | |
2146 | } | |
2147 | ||
b79a4a1b | 2148 | /* First recover reboot state... */ |
e345e88a | 2149 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2150 | section = "reclaim reboot"; |
591d71cb | 2151 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2152 | clp->cl_mvops->reboot_recovery_ops); |
b6d408ba | 2153 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2154 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) |
c3fad1b1 | 2155 | continue; |
b79a4a1b | 2156 | nfs4_state_end_reclaim_reboot(clp); |
b6d408ba TM |
2157 | if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
2158 | continue; | |
2159 | if (status < 0) | |
2160 | goto out_error; | |
02860014 TM |
2161 | } |
2162 | ||
b79a4a1b TM |
2163 | /* Now recover expired state... */ |
2164 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2165 | section = "reclaim nograce"; |
591d71cb | 2166 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2167 | clp->cl_mvops->nograce_recovery_ops); |
b6d408ba | 2168 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) || |
6df08189 | 2169 | test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state) || |
b6d408ba TM |
2170 | test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
2171 | continue; | |
2172 | if (status < 0) | |
b79a4a1b | 2173 | goto out_error; |
1da177e4 | 2174 | } |
707fb4b3 | 2175 | |
5601a00d | 2176 | nfs4_end_drain_session(clp); |
707fb4b3 TM |
2177 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
2178 | nfs_client_return_marked_delegations(clp); | |
2179 | continue; | |
2180 | } | |
e005e804 TM |
2181 | |
2182 | nfs4_clear_state_manager_bit(clp); | |
f3c76491 TM |
2183 | /* Did we race with an attempt to give us more work? */ |
2184 | if (clp->cl_state == 0) | |
2185 | break; | |
2186 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) | |
2187 | break; | |
47c2199b | 2188 | } while (atomic_read(&clp->cl_count) > 1); |
e005e804 | 2189 | return; |
1da177e4 | 2190 | out_error: |
8ed27d4f WAA |
2191 | if (strlen(section)) |
2192 | section_sep = ": "; | |
2193 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2194 | " with error %d\n", section_sep, section, | |
2195 | clp->cl_hostname, -status); | |
ffe5a830 | 2196 | ssleep(1); |
5601a00d | 2197 | nfs4_end_drain_session(clp); |
e005e804 TM |
2198 | nfs4_clear_state_manager_bit(clp); |
2199 | } | |
2200 | ||
2201 | static int nfs4_run_state_manager(void *ptr) | |
2202 | { | |
2203 | struct nfs_client *clp = ptr; | |
2204 | ||
2205 | allow_signal(SIGKILL); | |
2206 | nfs4_state_manager(clp); | |
2207 | nfs_put_client(clp); | |
2208 | module_put_and_exit(0); | |
2209 | return 0; | |
1da177e4 LT |
2210 | } |
2211 | ||
2212 | /* | |
2213 | * Local variables: | |
2214 | * c-basic-offset: 8 | |
2215 | * End: | |
2216 | */ |