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 | 44 | #include <linux/nfs_fs.h> |
5043e900 TM |
45 | #include <linux/kthread.h> |
46 | #include <linux/module.h> | |
9f958ab8 | 47 | #include <linux/random.h> |
8c7597f6 | 48 | #include <linux/ratelimit.h> |
1da177e4 LT |
49 | #include <linux/workqueue.h> |
50 | #include <linux/bitops.h> | |
0aaaf5c4 | 51 | #include <linux/jiffies.h> |
1da177e4 | 52 | |
05f4c350 CL |
53 | #include <linux/sunrpc/clnt.h> |
54 | ||
4ce79717 | 55 | #include "nfs4_fs.h" |
1da177e4 LT |
56 | #include "callback.h" |
57 | #include "delegation.h" | |
24c8dbbb | 58 | #include "internal.h" |
40c64c26 | 59 | #include "nfs4idmap.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 | ||
93b717fd | 68 | const nfs4_stateid zero_stateid = { |
e0714ec4 | 69 | { .data = { 0 } }, |
93b717fd TM |
70 | .type = NFS4_SPECIAL_STATEID_TYPE, |
71 | }; | |
fcd8843c TM |
72 | const nfs4_stateid invalid_stateid = { |
73 | { | |
445f288d TM |
74 | /* Funky initialiser keeps older gcc versions happy */ |
75 | .data = { 0xff, 0xff, 0xff, 0xff, 0 }, | |
fcd8843c TM |
76 | }, |
77 | .type = NFS4_INVALID_STATEID_TYPE, | |
78 | }; | |
79 | ||
2409a976 FI |
80 | const nfs4_stateid current_stateid = { |
81 | { | |
82 | /* Funky initialiser keeps older gcc versions happy */ | |
83 | .data = { 0x0, 0x0, 0x0, 0x1, 0 }, | |
84 | }, | |
85 | .type = NFS4_SPECIAL_STATEID_TYPE, | |
86 | }; | |
87 | ||
05f4c350 | 88 | static DEFINE_MUTEX(nfs_clid_init_mutex); |
1da177e4 | 89 | |
a52458b4 | 90 | int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred) |
1da177e4 | 91 | { |
fd954ae1 TM |
92 | struct nfs4_setclientid_res clid = { |
93 | .clientid = clp->cl_clientid, | |
94 | .confirm = clp->cl_confirm, | |
95 | }; | |
f738f517 CL |
96 | unsigned short port; |
97 | int status; | |
bbe0a3aa | 98 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
f738f517 | 99 | |
fd954ae1 TM |
100 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
101 | goto do_confirm; | |
bbe0a3aa | 102 | port = nn->nfs_callback_tcpport; |
f738f517 | 103 | if (clp->cl_addr.ss_family == AF_INET6) |
29dcc16a | 104 | port = nn->nfs_callback_tcpport6; |
f738f517 | 105 | |
bb8b27e5 TM |
106 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
107 | if (status != 0) | |
108 | goto out; | |
fd954ae1 TM |
109 | clp->cl_clientid = clid.clientid; |
110 | clp->cl_confirm = clid.confirm; | |
111 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
112 | do_confirm: | |
bb8b27e5 TM |
113 | status = nfs4_proc_setclientid_confirm(clp, &clid, cred); |
114 | if (status != 0) | |
115 | goto out; | |
fd954ae1 | 116 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
bb8b27e5 TM |
117 | nfs4_schedule_state_renewal(clp); |
118 | out: | |
1da177e4 LT |
119 | return status; |
120 | } | |
121 | ||
05f4c350 CL |
122 | /** |
123 | * nfs40_discover_server_trunking - Detect server IP address trunking (mv0) | |
124 | * | |
125 | * @clp: nfs_client under test | |
126 | * @result: OUT: found nfs_client, or clp | |
127 | * @cred: credential to use for trunking test | |
128 | * | |
129 | * Returns zero, a negative errno, or a negative NFS4ERR status. | |
130 | * If zero is returned, an nfs_client pointer is planted in | |
131 | * "result". | |
132 | * | |
133 | * Note: The returned client may not yet be marked ready. | |
134 | */ | |
135 | int nfs40_discover_server_trunking(struct nfs_client *clp, | |
136 | struct nfs_client **result, | |
a52458b4 | 137 | const struct cred *cred) |
05f4c350 CL |
138 | { |
139 | struct nfs4_setclientid_res clid = { | |
140 | .clientid = clp->cl_clientid, | |
141 | .confirm = clp->cl_confirm, | |
142 | }; | |
9f62387d | 143 | struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
05f4c350 CL |
144 | unsigned short port; |
145 | int status; | |
146 | ||
9f62387d | 147 | port = nn->nfs_callback_tcpport; |
05f4c350 | 148 | if (clp->cl_addr.ss_family == AF_INET6) |
9f62387d | 149 | port = nn->nfs_callback_tcpport6; |
05f4c350 CL |
150 | |
151 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); | |
152 | if (status != 0) | |
153 | goto out; | |
154 | clp->cl_clientid = clid.clientid; | |
155 | clp->cl_confirm = clid.confirm; | |
156 | ||
157 | status = nfs40_walk_client_list(clp, result, cred); | |
202c312d | 158 | if (status == 0) { |
05f4c350 CL |
159 | /* Sustain the lease, even if it's empty. If the clientid4 |
160 | * goes stale it's of no use for trunking discovery. */ | |
161 | nfs4_schedule_state_renewal(*result); | |
05f4c350 | 162 | } |
05f4c350 CL |
163 | out: |
164 | return status; | |
165 | } | |
166 | ||
a52458b4 | 167 | const struct cred *nfs4_get_machine_cred(struct nfs_client *clp) |
a2b2bb88 | 168 | { |
a52458b4 | 169 | return get_cred(rpc_machine_cred()); |
a2b2bb88 TM |
170 | } |
171 | ||
d688f7b8 CL |
172 | static void nfs4_root_machine_cred(struct nfs_client *clp) |
173 | { | |
d688f7b8 | 174 | |
5e16923b N |
175 | /* Force root creds instead of machine */ |
176 | clp->cl_principal = NULL; | |
177 | clp->cl_rpcclient->cl_principal = NULL; | |
d688f7b8 CL |
178 | } |
179 | ||
a52458b4 | 180 | static const struct cred * |
24d292b8 | 181 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) |
b4454fe1 | 182 | { |
a52458b4 | 183 | const struct cred *cred = NULL; |
b4454fe1 | 184 | struct nfs4_state_owner *sp; |
9f958ab8 | 185 | struct rb_node *pos; |
b4454fe1 | 186 | |
24d292b8 CL |
187 | for (pos = rb_first(&server->state_owners); |
188 | pos != NULL; | |
189 | pos = rb_next(pos)) { | |
190 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
191 | if (list_empty(&sp->so_states)) |
192 | continue; | |
a52458b4 | 193 | cred = get_cred(sp->so_cred); |
b4454fe1 TM |
194 | break; |
195 | } | |
196 | return cred; | |
197 | } | |
198 | ||
24d292b8 | 199 | /** |
f15e1e8b | 200 | * nfs4_get_renew_cred - Acquire credential for a renew operation |
24d292b8 CL |
201 | * @clp: client state handle |
202 | * | |
203 | * Returns an rpc_cred with reference count bumped, or NULL. | |
204 | * Caller must hold clp->cl_lock. | |
205 | */ | |
a52458b4 | 206 | const struct cred *nfs4_get_renew_cred(struct nfs_client *clp) |
24d292b8 | 207 | { |
a52458b4 | 208 | const struct cred *cred = NULL; |
24d292b8 CL |
209 | struct nfs_server *server; |
210 | ||
e49a29bd | 211 | /* Use machine credentials if available */ |
f15e1e8b | 212 | cred = nfs4_get_machine_cred(clp); |
e49a29bd SP |
213 | if (cred != NULL) |
214 | goto out; | |
215 | ||
f15e1e8b | 216 | spin_lock(&clp->cl_lock); |
24d292b8 CL |
217 | rcu_read_lock(); |
218 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
219 | cred = nfs4_get_renew_cred_server_locked(server); | |
220 | if (cred != NULL) | |
221 | break; | |
222 | } | |
223 | rcu_read_unlock(); | |
f15e1e8b | 224 | spin_unlock(&clp->cl_lock); |
e49a29bd SP |
225 | |
226 | out: | |
24d292b8 CL |
227 | return cred; |
228 | } | |
229 | ||
62f288a0 | 230 | static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl) |
9dfdf404 | 231 | { |
774d5f14 | 232 | if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
961a828d | 233 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 234 | nfs41_wake_slot_table(tbl); |
961a828d | 235 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 236 | } |
9dfdf404 RL |
237 | } |
238 | ||
62f288a0 AA |
239 | static void nfs4_end_drain_session(struct nfs_client *clp) |
240 | { | |
241 | struct nfs4_session *ses = clp->cl_session; | |
242 | ||
2cf8bca8 CL |
243 | if (clp->cl_slot_tbl) { |
244 | nfs4_end_drain_slot_table(clp->cl_slot_tbl); | |
245 | return; | |
246 | } | |
247 | ||
62f288a0 AA |
248 | if (ses != NULL) { |
249 | nfs4_end_drain_slot_table(&ses->bc_slot_table); | |
250 | nfs4_end_drain_slot_table(&ses->fc_slot_table); | |
251 | } | |
252 | } | |
253 | ||
774d5f14 | 254 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 255 | { |
774d5f14 | 256 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 257 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 258 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
16735d02 | 259 | reinit_completion(&tbl->complete); |
9dfdf404 | 260 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 261 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
262 | } |
263 | spin_unlock(&tbl->slot_tbl_lock); | |
264 | return 0; | |
265 | } | |
266 | ||
42acd021 AA |
267 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
268 | { | |
269 | struct nfs4_session *ses = clp->cl_session; | |
8aafd2fd | 270 | int ret; |
42acd021 | 271 | |
2cf8bca8 CL |
272 | if (clp->cl_slot_tbl) |
273 | return nfs4_drain_slot_tbl(clp->cl_slot_tbl); | |
274 | ||
42acd021 | 275 | /* back channel */ |
774d5f14 | 276 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
277 | if (ret) |
278 | return ret; | |
279 | /* fore channel */ | |
774d5f14 | 280 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
281 | } |
282 | ||
c9fdeb28 CL |
283 | #if defined(CONFIG_NFS_V4_1) |
284 | ||
2cf8bca8 CL |
285 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
286 | { | |
287 | int status; | |
288 | struct nfs_fsinfo fsinfo; | |
fb10fb67 | 289 | unsigned long now; |
2cf8bca8 CL |
290 | |
291 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { | |
292 | nfs4_schedule_state_renewal(clp); | |
293 | return 0; | |
294 | } | |
295 | ||
fb10fb67 | 296 | now = jiffies; |
2cf8bca8 CL |
297 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
298 | if (status == 0) { | |
fb10fb67 | 299 | nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now); |
2cf8bca8 CL |
300 | nfs4_schedule_state_renewal(clp); |
301 | } | |
302 | ||
303 | return status; | |
304 | } | |
305 | ||
bda197f5 TM |
306 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
307 | { | |
308 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
309 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
310 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
311 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
312 | nfs41_setup_state_renewal(clp); | |
313 | } | |
314 | ||
a52458b4 | 315 | int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred) |
4d643d1d AA |
316 | { |
317 | int status; | |
318 | ||
fd954ae1 TM |
319 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
320 | goto do_confirm; | |
4d643d1d | 321 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
322 | if (status != 0) |
323 | goto out; | |
fd954ae1 TM |
324 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
325 | do_confirm: | |
848f5bda | 326 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
327 | if (status != 0) |
328 | goto out; | |
bda197f5 | 329 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
330 | nfs_mark_client_ready(clp, NFS_CS_READY); |
331 | out: | |
4d643d1d AA |
332 | return status; |
333 | } | |
334 | ||
05f4c350 CL |
335 | /** |
336 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
337 | * | |
338 | * @clp: nfs_client under test | |
339 | * @result: OUT: found nfs_client, or clp | |
340 | * @cred: credential to use for trunking test | |
341 | * | |
342 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
343 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
344 | * "result". | |
345 | * | |
346 | * Note: The returned client may not yet be marked ready. | |
347 | */ | |
348 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
349 | struct nfs_client **result, | |
a52458b4 | 350 | const struct cred *cred) |
05f4c350 CL |
351 | { |
352 | int status; | |
353 | ||
354 | status = nfs4_proc_exchange_id(clp, cred); | |
355 | if (status != NFS4_OK) | |
356 | return status; | |
357 | ||
48d66b97 TM |
358 | status = nfs41_walk_client_list(clp, result, cred); |
359 | if (status < 0) | |
360 | return status; | |
361 | if (clp != *result) | |
362 | return 0; | |
363 | ||
8dcbec6d CL |
364 | /* |
365 | * Purge state if the client id was established in a prior | |
366 | * instance and the client id could not have arrived on the | |
367 | * server via Transparent State Migration. | |
368 | */ | |
369 | if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) { | |
370 | if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags)) | |
371 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); | |
372 | else | |
373 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
374 | } | |
48d66b97 TM |
375 | nfs4_schedule_state_manager(clp); |
376 | status = nfs_wait_client_init_complete(clp); | |
377 | if (status < 0) | |
378 | nfs_put_client(clp); | |
379 | return status; | |
05f4c350 CL |
380 | } |
381 | ||
b4b82607 AA |
382 | #endif /* CONFIG_NFS_V4_1 */ |
383 | ||
24d292b8 | 384 | /** |
73d8bde5 | 385 | * nfs4_get_clid_cred - Acquire credential for a setclientid operation |
24d292b8 CL |
386 | * @clp: client state handle |
387 | * | |
a52458b4 | 388 | * Returns a cred with reference count bumped, or NULL. |
24d292b8 | 389 | */ |
a52458b4 | 390 | const struct cred *nfs4_get_clid_cred(struct nfs_client *clp) |
24d292b8 | 391 | { |
a52458b4 | 392 | const struct cred *cred; |
286d7d6a | 393 | |
f15e1e8b | 394 | cred = nfs4_get_machine_cred(clp); |
a2b2bb88 | 395 | return cred; |
286d7d6a TM |
396 | } |
397 | ||
1da177e4 | 398 | static struct nfs4_state_owner * |
a52458b4 | 399 | nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred) |
1da177e4 | 400 | { |
24d292b8 | 401 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 402 | *parent = NULL; |
414adf14 | 403 | struct nfs4_state_owner *sp; |
a52458b4 | 404 | int cmp; |
1da177e4 | 405 | |
9f958ab8 TM |
406 | while (*p != NULL) { |
407 | parent = *p; | |
24d292b8 | 408 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
a52458b4 | 409 | cmp = cred_fscmp(cred, sp->so_cred); |
9f958ab8 | 410 | |
a52458b4 | 411 | if (cmp < 0) |
9f958ab8 | 412 | p = &parent->rb_left; |
a52458b4 | 413 | else if (cmp > 0) |
9f958ab8 TM |
414 | p = &parent->rb_right; |
415 | else { | |
0aaaf5c4 CL |
416 | if (!list_empty(&sp->so_lru)) |
417 | list_del_init(&sp->so_lru); | |
9f958ab8 | 418 | atomic_inc(&sp->so_count); |
414adf14 | 419 | return sp; |
9f958ab8 | 420 | } |
1da177e4 | 421 | } |
414adf14 | 422 | return NULL; |
1da177e4 LT |
423 | } |
424 | ||
9f958ab8 | 425 | static struct nfs4_state_owner * |
24d292b8 | 426 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 427 | { |
24d292b8 CL |
428 | struct nfs_server *server = new->so_server; |
429 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
430 | *parent = NULL; |
431 | struct nfs4_state_owner *sp; | |
a52458b4 | 432 | int cmp; |
9f958ab8 TM |
433 | |
434 | while (*p != NULL) { | |
435 | parent = *p; | |
24d292b8 | 436 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
a52458b4 | 437 | cmp = cred_fscmp(new->so_cred, sp->so_cred); |
9f958ab8 | 438 | |
a52458b4 | 439 | if (cmp < 0) |
9f958ab8 | 440 | p = &parent->rb_left; |
a52458b4 | 441 | else if (cmp > 0) |
9f958ab8 TM |
442 | p = &parent->rb_right; |
443 | else { | |
0aaaf5c4 CL |
444 | if (!list_empty(&sp->so_lru)) |
445 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
446 | atomic_inc(&sp->so_count); |
447 | return sp; | |
448 | } | |
449 | } | |
24d292b8 CL |
450 | rb_link_node(&new->so_server_node, parent, p); |
451 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
452 | return new; |
453 | } | |
454 | ||
455 | static void | |
24d292b8 | 456 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 457 | { |
24d292b8 CL |
458 | struct nfs_server *server = sp->so_server; |
459 | ||
460 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
461 | rb_erase(&sp->so_server_node, &server->state_owners); | |
9f958ab8 TM |
462 | } |
463 | ||
7ba127ab TM |
464 | static void |
465 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
466 | { | |
95b72eb0 | 467 | sc->create_time = ktime_get(); |
7ba127ab TM |
468 | sc->flags = 0; |
469 | sc->counter = 0; | |
470 | spin_lock_init(&sc->lock); | |
471 | INIT_LIST_HEAD(&sc->list); | |
472 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
473 | } | |
474 | ||
475 | static void | |
476 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
477 | { | |
478 | rpc_destroy_wait_queue(&sc->wait); | |
479 | } | |
480 | ||
1da177e4 LT |
481 | /* |
482 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
483 | * create a new state_owner. | |
484 | * | |
485 | */ | |
486 | static struct nfs4_state_owner * | |
d1e284d5 | 487 | nfs4_alloc_state_owner(struct nfs_server *server, |
a52458b4 | 488 | const struct cred *cred, |
d1e284d5 | 489 | gfp_t gfp_flags) |
1da177e4 LT |
490 | { |
491 | struct nfs4_state_owner *sp; | |
492 | ||
d1e284d5 | 493 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
494 | if (!sp) |
495 | return NULL; | |
aae5730e MW |
496 | sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0, |
497 | gfp_flags); | |
498 | if (sp->so_seqid.owner_id < 0) { | |
499 | kfree(sp); | |
500 | return NULL; | |
501 | } | |
d1e284d5 | 502 | sp->so_server = server; |
a52458b4 | 503 | sp->so_cred = get_cred(cred); |
ec073428 | 504 | spin_lock_init(&sp->so_lock); |
1da177e4 | 505 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 506 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 507 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 508 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 509 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 510 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
511 | return sp; |
512 | } | |
513 | ||
1d2e88e7 | 514 | static void |
86cfb041 | 515 | nfs4_reset_state_owner(struct nfs4_state_owner *sp) |
1da177e4 | 516 | { |
86cfb041 N |
517 | /* This state_owner is no longer usable, but must |
518 | * remain in place so that state recovery can find it | |
519 | * and the opens associated with it. | |
520 | * It may also be used for new 'open' request to | |
521 | * return a delegation to the server. | |
522 | * So update the 'create_time' so that it looks like | |
523 | * a new state_owner. This will cause the server to | |
524 | * request an OPEN_CONFIRM to start a new sequence. | |
525 | */ | |
526 | sp->so_seqid.create_time = ktime_get(); | |
1da177e4 LT |
527 | } |
528 | ||
0aaaf5c4 CL |
529 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
530 | { | |
7ba127ab | 531 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
a52458b4 | 532 | put_cred(sp->so_cred); |
aae5730e | 533 | ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id); |
0aaaf5c4 CL |
534 | kfree(sp); |
535 | } | |
536 | ||
537 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
538 | { | |
539 | struct nfs_client *clp = server->nfs_client; | |
540 | struct nfs4_state_owner *sp, *tmp; | |
541 | unsigned long time_min, time_max; | |
542 | LIST_HEAD(doomed); | |
543 | ||
544 | spin_lock(&clp->cl_lock); | |
545 | time_max = jiffies; | |
546 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
547 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
548 | /* NB: LRU is sorted so that oldest is at the head */ | |
549 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
550 | break; | |
551 | list_move(&sp->so_lru, &doomed); | |
552 | nfs4_remove_state_owner_locked(sp); | |
553 | } | |
554 | spin_unlock(&clp->cl_lock); | |
555 | ||
556 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
557 | list_del(&sp->so_lru); | |
558 | nfs4_free_state_owner(sp); | |
559 | } | |
560 | } | |
561 | ||
24d292b8 CL |
562 | /** |
563 | * nfs4_get_state_owner - Look up a state owner given a credential | |
564 | * @server: nfs_server to search | |
565 | * @cred: RPC credential to match | |
566 | * | |
567 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
568 | */ | |
569 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
a52458b4 | 570 | const struct cred *cred, |
d1e284d5 | 571 | gfp_t gfp_flags) |
1da177e4 | 572 | { |
7539bbab | 573 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
574 | struct nfs4_state_owner *sp, *new; |
575 | ||
1da177e4 | 576 | spin_lock(&clp->cl_lock); |
24d292b8 | 577 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 578 | spin_unlock(&clp->cl_lock); |
1da177e4 | 579 | if (sp != NULL) |
0aaaf5c4 | 580 | goto out; |
d1e284d5 | 581 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 582 | if (new == NULL) |
0aaaf5c4 | 583 | goto out; |
aae5730e MW |
584 | spin_lock(&clp->cl_lock); |
585 | sp = nfs4_insert_state_owner_locked(new); | |
586 | spin_unlock(&clp->cl_lock); | |
d1e284d5 TM |
587 | if (sp != new) |
588 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
589 | out: |
590 | nfs4_gc_state_owners(server); | |
9f958ab8 | 591 | return sp; |
1da177e4 LT |
592 | } |
593 | ||
24d292b8 CL |
594 | /** |
595 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
596 | * @sp: state owner data to release | |
7bf97bc2 TM |
597 | * |
598 | * Note that we keep released state owners on an LRU | |
599 | * list. | |
600 | * This caches valid state owners so that they can be | |
601 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
602 | * It also pins the uniquifier of dropped state owners for | |
603 | * a while, to ensure that those state owner names are | |
604 | * never reused. | |
24d292b8 | 605 | */ |
1da177e4 LT |
606 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
607 | { | |
0aaaf5c4 CL |
608 | struct nfs_server *server = sp->so_server; |
609 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
610 | |
611 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
612 | return; | |
0aaaf5c4 | 613 | |
7bf97bc2 TM |
614 | sp->so_expires = jiffies; |
615 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
616 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
617 | } |
618 | ||
619 | /** | |
620 | * nfs4_purge_state_owners - Release all cached state owners | |
621 | * @server: nfs_server with cached state owners to release | |
622 | * | |
623 | * Called at umount time. Remaining state owners will be on | |
624 | * the LRU with ref count of zero. | |
625 | */ | |
626 | void nfs4_purge_state_owners(struct nfs_server *server) | |
627 | { | |
628 | struct nfs_client *clp = server->nfs_client; | |
629 | struct nfs4_state_owner *sp, *tmp; | |
630 | LIST_HEAD(doomed); | |
631 | ||
632 | spin_lock(&clp->cl_lock); | |
633 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
634 | list_move(&sp->so_lru, &doomed); | |
635 | nfs4_remove_state_owner_locked(sp); | |
636 | } | |
1da177e4 | 637 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
638 | |
639 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
640 | list_del(&sp->so_lru); | |
641 | nfs4_free_state_owner(sp); | |
642 | } | |
1da177e4 LT |
643 | } |
644 | ||
645 | static struct nfs4_state * | |
646 | nfs4_alloc_open_state(void) | |
647 | { | |
648 | struct nfs4_state *state; | |
649 | ||
8535b2be | 650 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
651 | if (!state) |
652 | return NULL; | |
ace9fad4 | 653 | refcount_set(&state->count, 1); |
1da177e4 | 654 | INIT_LIST_HEAD(&state->lock_states); |
8d0a8a9d | 655 | spin_lock_init(&state->state_lock); |
8bda4e4c | 656 | seqlock_init(&state->seqlock); |
c9399f21 | 657 | init_waitqueue_head(&state->waitq); |
1da177e4 LT |
658 | return state; |
659 | } | |
660 | ||
4cecb76f | 661 | void |
dc0b027d | 662 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 663 | { |
dc0b027d | 664 | if (state->state == fmode) |
4cecb76f TM |
665 | return; |
666 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
667 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
668 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
669 | list_move(&state->open_states, &state->owner->so_states); |
670 | else | |
671 | list_move_tail(&state->open_states, &state->owner->so_states); | |
672 | } | |
dc0b027d | 673 | state->state = fmode; |
4cecb76f TM |
674 | } |
675 | ||
1da177e4 LT |
676 | static struct nfs4_state * |
677 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
678 | { | |
679 | struct nfs_inode *nfsi = NFS_I(inode); | |
680 | struct nfs4_state *state; | |
681 | ||
9ae075fd | 682 | list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) { |
1c816efa | 683 | if (state->owner != owner) |
1da177e4 | 684 | continue; |
5d422301 TM |
685 | if (!nfs4_valid_open_stateid(state)) |
686 | continue; | |
ace9fad4 | 687 | if (refcount_inc_not_zero(&state->count)) |
1da177e4 | 688 | return state; |
1da177e4 LT |
689 | } |
690 | return NULL; | |
691 | } | |
692 | ||
1da177e4 LT |
693 | static void |
694 | nfs4_free_open_state(struct nfs4_state *state) | |
695 | { | |
9ae075fd | 696 | kfree_rcu(state, rcu_head); |
1da177e4 LT |
697 | } |
698 | ||
699 | struct nfs4_state * | |
700 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
701 | { | |
702 | struct nfs4_state *state, *new; | |
703 | struct nfs_inode *nfsi = NFS_I(inode); | |
704 | ||
9ae075fd | 705 | rcu_read_lock(); |
1da177e4 | 706 | state = __nfs4_find_state_byowner(inode, owner); |
9ae075fd | 707 | rcu_read_unlock(); |
1da177e4 LT |
708 | if (state) |
709 | goto out; | |
710 | new = nfs4_alloc_open_state(); | |
ec073428 | 711 | spin_lock(&owner->so_lock); |
1da177e4 LT |
712 | spin_lock(&inode->i_lock); |
713 | state = __nfs4_find_state_byowner(inode, owner); | |
714 | if (state == NULL && new != NULL) { | |
715 | state = new; | |
1da177e4 LT |
716 | state->owner = owner; |
717 | atomic_inc(&owner->so_count); | |
9ae075fd | 718 | list_add_rcu(&state->inode_states, &nfsi->open_states); |
0444d76a DC |
719 | ihold(inode); |
720 | state->inode = inode; | |
1da177e4 | 721 | spin_unlock(&inode->i_lock); |
ec073428 TM |
722 | /* Note: The reclaim code dictates that we add stateless |
723 | * and read-only stateids to the end of the list */ | |
724 | list_add_tail(&state->open_states, &owner->so_states); | |
725 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
726 | } else { |
727 | spin_unlock(&inode->i_lock); | |
ec073428 | 728 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
729 | if (new) |
730 | nfs4_free_open_state(new); | |
731 | } | |
732 | out: | |
733 | return state; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | void nfs4_put_open_state(struct nfs4_state *state) |
737 | { | |
738 | struct inode *inode = state->inode; | |
739 | struct nfs4_state_owner *owner = state->owner; | |
740 | ||
ace9fad4 | 741 | if (!refcount_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 742 | return; |
ec073428 | 743 | spin_lock(&inode->i_lock); |
9ae075fd | 744 | list_del_rcu(&state->inode_states); |
1da177e4 | 745 | list_del(&state->open_states); |
ec073428 TM |
746 | spin_unlock(&inode->i_lock); |
747 | spin_unlock(&owner->so_lock); | |
1da177e4 | 748 | iput(inode); |
1da177e4 LT |
749 | nfs4_free_open_state(state); |
750 | nfs4_put_state_owner(owner); | |
751 | } | |
752 | ||
753 | /* | |
83c9d41e | 754 | * Close the current file. |
1da177e4 | 755 | */ |
643168c2 | 756 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 757 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 758 | { |
1da177e4 | 759 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 760 | int call_close = 0; |
dc0b027d | 761 | fmode_t newstate; |
1da177e4 LT |
762 | |
763 | atomic_inc(&owner->so_count); | |
1da177e4 | 764 | /* Protect against nfs4_find_state() */ |
ec073428 | 765 | spin_lock(&owner->so_lock); |
dc0b027d | 766 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
767 | case FMODE_READ: |
768 | state->n_rdonly--; | |
769 | break; | |
770 | case FMODE_WRITE: | |
771 | state->n_wronly--; | |
772 | break; | |
773 | case FMODE_READ|FMODE_WRITE: | |
774 | state->n_rdwr--; | |
775 | } | |
003707c7 | 776 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 777 | if (state->n_rdwr == 0) { |
003707c7 | 778 | if (state->n_rdonly == 0) { |
e7616923 | 779 | newstate &= ~FMODE_READ; |
003707c7 TM |
780 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
781 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
782 | } | |
783 | if (state->n_wronly == 0) { | |
e7616923 | 784 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
785 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
786 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
787 | } | |
788 | if (newstate == 0) | |
789 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 790 | } |
003707c7 | 791 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 792 | spin_unlock(&owner->so_lock); |
4cecb76f | 793 | |
003707c7 | 794 | if (!call_close) { |
b39e625b TM |
795 | nfs4_put_open_state(state); |
796 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
797 | } else |
798 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
799 | } |
800 | ||
643168c2 | 801 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 802 | { |
643168c2 | 803 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
804 | } |
805 | ||
643168c2 | 806 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 807 | { |
643168c2 | 808 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
809 | } |
810 | ||
811 | /* | |
812 | * Search the state->lock_states for an existing lock_owner | |
3f8f2548 N |
813 | * that is compatible with either of the given owners. |
814 | * If the second is non-zero, then the first refers to a Posix-lock | |
815 | * owner (current->files) and the second refers to a flock/OFD | |
816 | * owner (struct file*). In that case, prefer a match for the first | |
817 | * owner. | |
818 | * If both sorts of locks are held on the one file we cannot know | |
819 | * which stateid was intended to be used, so a "correct" choice cannot | |
820 | * be made. Failing that, a "consistent" choice is preferable. The | |
821 | * consistent choice we make is to prefer the first owner, that of a | |
822 | * Posix lock. | |
1da177e4 LT |
823 | */ |
824 | static struct nfs4_lock_state * | |
8d424431 N |
825 | __nfs4_find_lock_state(struct nfs4_state *state, |
826 | fl_owner_t fl_owner, fl_owner_t fl_owner2) | |
1da177e4 | 827 | { |
3f8f2548 | 828 | struct nfs4_lock_state *pos, *ret = NULL; |
1da177e4 | 829 | list_for_each_entry(pos, &state->lock_states, ls_locks) { |
3f8f2548 N |
830 | if (pos->ls_owner == fl_owner) { |
831 | ret = pos; | |
832 | break; | |
833 | } | |
834 | if (pos->ls_owner == fl_owner2) | |
835 | ret = pos; | |
1da177e4 | 836 | } |
3f8f2548 | 837 | if (ret) |
194bc1f4 | 838 | refcount_inc(&ret->ls_count); |
3f8f2548 | 839 | return ret; |
1da177e4 LT |
840 | } |
841 | ||
1da177e4 LT |
842 | /* |
843 | * Return a compatible lock_state. If no initialized lock_state structure | |
844 | * exists, return an uninitialized one. | |
845 | * | |
1da177e4 | 846 | */ |
8003d3c4 | 847 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 LT |
848 | { |
849 | struct nfs4_lock_state *lsp; | |
24d292b8 | 850 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 851 | |
8535b2be | 852 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
853 | if (lsp == NULL) |
854 | return NULL; | |
7ba127ab | 855 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
194bc1f4 | 856 | refcount_set(&lsp->ls_count, 1); |
b64aec8d | 857 | lsp->ls_state = state; |
8003d3c4 | 858 | lsp->ls_owner = fl_owner; |
48c22eb2 TM |
859 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
860 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 861 | goto out_free; |
8d0a8a9d | 862 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 863 | return lsp; |
d2d7ce28 TM |
864 | out_free: |
865 | kfree(lsp); | |
866 | return NULL; | |
1da177e4 LT |
867 | } |
868 | ||
5ae67c4f | 869 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 870 | { |
48c22eb2 | 871 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 872 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
873 | kfree(lsp); |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Return a compatible lock_state. If no initialized lock_state structure | |
878 | * exists, return an uninitialized one. | |
879 | * | |
1da177e4 | 880 | */ |
8003d3c4 | 881 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 882 | { |
8d0a8a9d | 883 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 884 | |
8d0a8a9d TM |
885 | for(;;) { |
886 | spin_lock(&state->state_lock); | |
68e33bd6 | 887 | lsp = __nfs4_find_lock_state(state, owner, NULL); |
8d0a8a9d TM |
888 | if (lsp != NULL) |
889 | break; | |
890 | if (new != NULL) { | |
8d0a8a9d TM |
891 | list_add(&new->ls_locks, &state->lock_states); |
892 | set_bit(LK_STATE_IN_USE, &state->flags); | |
893 | lsp = new; | |
894 | new = NULL; | |
895 | break; | |
896 | } | |
897 | spin_unlock(&state->state_lock); | |
8003d3c4 | 898 | new = nfs4_alloc_lock_state(state, owner); |
8d0a8a9d TM |
899 | if (new == NULL) |
900 | return NULL; | |
901 | } | |
902 | spin_unlock(&state->state_lock); | |
9f958ab8 | 903 | if (new != NULL) |
5ae67c4f | 904 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
905 | return lsp; |
906 | } | |
907 | ||
908 | /* | |
8d0a8a9d TM |
909 | * Release reference to lock_state, and free it if we see that |
910 | * it is no longer in use | |
1da177e4 | 911 | */ |
faf5f49c | 912 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 913 | { |
c8b2d0bf | 914 | struct nfs_server *server; |
8d0a8a9d | 915 | struct nfs4_state *state; |
1da177e4 | 916 | |
8d0a8a9d TM |
917 | if (lsp == NULL) |
918 | return; | |
919 | state = lsp->ls_state; | |
194bc1f4 | 920 | if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
8d0a8a9d TM |
921 | return; |
922 | list_del(&lsp->ls_locks); | |
923 | if (list_empty(&state->lock_states)) | |
924 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
925 | spin_unlock(&state->state_lock); | |
0c0e0d3c JL |
926 | server = state->owner->so_server; |
927 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { | |
928 | struct nfs_client *clp = server->nfs_client; | |
929 | ||
930 | clp->cl_mvops->free_lock_state(server, lsp); | |
931 | } else | |
c8b2d0bf | 932 | nfs4_free_lock_state(server, lsp); |
1da177e4 LT |
933 | } |
934 | ||
8d0a8a9d | 935 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 936 | { |
8d0a8a9d | 937 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 938 | |
8d0a8a9d | 939 | dst->fl_u.nfs4_fl.owner = lsp; |
194bc1f4 | 940 | refcount_inc(&lsp->ls_count); |
8d0a8a9d | 941 | } |
1da177e4 | 942 | |
8d0a8a9d | 943 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 944 | { |
8d0a8a9d | 945 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
946 | } |
947 | ||
6aed6285 | 948 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
949 | .fl_copy_lock = nfs4_fl_copy_lock, |
950 | .fl_release_private = nfs4_fl_release_lock, | |
951 | }; | |
952 | ||
953 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 954 | { |
8d0a8a9d TM |
955 | struct nfs4_lock_state *lsp; |
956 | ||
957 | if (fl->fl_ops != NULL) | |
958 | return 0; | |
8003d3c4 | 959 | lsp = nfs4_get_lock_state(state, fl->fl_owner); |
8d0a8a9d TM |
960 | if (lsp == NULL) |
961 | return -ENOMEM; | |
962 | fl->fl_u.nfs4_fl.owner = lsp; | |
963 | fl->fl_ops = &nfs4_fl_lock_ops; | |
964 | return 0; | |
1da177e4 LT |
965 | } |
966 | ||
5521abfd TM |
967 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
968 | struct nfs4_state *state, | |
17393475 | 969 | const struct nfs_lock_context *l_ctx) |
1da177e4 | 970 | { |
8d0a8a9d | 971 | struct nfs4_lock_state *lsp; |
8d424431 | 972 | fl_owner_t fl_owner, fl_flock_owner; |
5521abfd | 973 | int ret = -ENOENT; |
1da177e4 | 974 | |
17393475 | 975 | if (l_ctx == NULL) |
2a369153 TM |
976 | goto out; |
977 | ||
8d0a8a9d | 978 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 979 | goto out; |
1da177e4 | 980 | |
d51fdb87 | 981 | fl_owner = l_ctx->lockowner; |
8d424431 N |
982 | fl_flock_owner = l_ctx->open_context->flock_owner; |
983 | ||
8d0a8a9d | 984 | spin_lock(&state->state_lock); |
8d424431 | 985 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner); |
ef1820f9 N |
986 | if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) |
987 | ret = -EIO; | |
988 | else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { | |
f597c537 | 989 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd | 990 | ret = 0; |
4fc8796d | 991 | } |
8d0a8a9d | 992 | spin_unlock(&state->state_lock); |
1da177e4 | 993 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
994 | out: |
995 | return ret; | |
996 | } | |
997 | ||
12f275cd TM |
998 | bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
999 | { | |
1000 | bool ret; | |
1001 | int seq; | |
1002 | ||
1003 | do { | |
1004 | ret = false; | |
1005 | seq = read_seqbegin(&state->seqlock); | |
1006 | if (nfs4_state_match_open_stateid_other(state, dst)) { | |
1007 | dst->seqid = state->open_stateid.seqid; | |
1008 | ret = true; | |
1009 | } | |
1010 | } while (read_seqretry(&state->seqlock, seq)); | |
1011 | return ret; | |
1012 | } | |
1013 | ||
c82bac6f | 1014 | bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 1015 | { |
c82bac6f | 1016 | bool ret; |
92b40e93 | 1017 | const nfs4_stateid *src; |
4fc8796d TM |
1018 | int seq; |
1019 | ||
1020 | do { | |
c82bac6f | 1021 | ret = false; |
92b40e93 | 1022 | src = &zero_stateid; |
4fc8796d | 1023 | seq = read_seqbegin(&state->seqlock); |
c82bac6f | 1024 | if (test_bit(NFS_OPEN_STATE, &state->flags)) { |
92b40e93 | 1025 | src = &state->open_stateid; |
c82bac6f TM |
1026 | ret = true; |
1027 | } | |
92b40e93 | 1028 | nfs4_stateid_copy(dst, src); |
4fc8796d | 1029 | } while (read_seqretry(&state->seqlock, seq)); |
c82bac6f | 1030 | return ret; |
4fc8796d TM |
1031 | } |
1032 | ||
1033 | /* | |
1034 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1035 | * requests. | |
1036 | */ | |
abf4e13c | 1037 | int nfs4_select_rw_stateid(struct nfs4_state *state, |
17393475 | 1038 | fmode_t fmode, const struct nfs_lock_context *l_ctx, |
a52458b4 | 1039 | nfs4_stateid *dst, const struct cred **cred) |
4fc8796d | 1040 | { |
abf4e13c TM |
1041 | int ret; |
1042 | ||
7ebeb7fe TM |
1043 | if (!nfs4_valid_open_stateid(state)) |
1044 | return -EIO; | |
abf4e13c TM |
1045 | if (cred != NULL) |
1046 | *cred = NULL; | |
17393475 | 1047 | ret = nfs4_copy_lock_stateid(dst, state, l_ctx); |
ef1820f9 N |
1048 | if (ret == -EIO) |
1049 | /* A lost lock - don't even consider delegations */ | |
1050 | goto out; | |
146d70ca | 1051 | /* returns true if delegation stateid found and copied */ |
abf4e13c | 1052 | if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) { |
146d70ca | 1053 | ret = 0; |
5521abfd | 1054 | goto out; |
146d70ca | 1055 | } |
5521abfd | 1056 | if (ret != -ENOENT) |
ef1820f9 N |
1057 | /* nfs4_copy_delegation_stateid() didn't over-write |
1058 | * dst, so it still has the lock stateid which we now | |
1059 | * choose to use. | |
1060 | */ | |
5521abfd | 1061 | goto out; |
927864cd TM |
1062 | nfs4_copy_open_stateid(dst, state); |
1063 | ret = 0; | |
5521abfd | 1064 | out: |
3b66486c TM |
1065 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1066 | dst->seqid = 0; | |
5521abfd | 1067 | return ret; |
1da177e4 LT |
1068 | } |
1069 | ||
8535b2be | 1070 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1071 | { |
cee54fc9 TM |
1072 | struct nfs_seqid *new; |
1073 | ||
8535b2be | 1074 | new = kmalloc(sizeof(*new), gfp_mask); |
badc76dd TM |
1075 | if (new == NULL) |
1076 | return ERR_PTR(-ENOMEM); | |
1077 | new->sequence = counter; | |
1078 | INIT_LIST_HEAD(&new->list); | |
1079 | new->task = NULL; | |
cee54fc9 TM |
1080 | return new; |
1081 | } | |
1082 | ||
72211dbe | 1083 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1084 | { |
4601df20 | 1085 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1086 | |
a6796419 | 1087 | if (seqid == NULL || list_empty(&seqid->list)) |
4601df20 TM |
1088 | return; |
1089 | sequence = seqid->sequence; | |
1090 | spin_lock(&sequence->lock); | |
1091 | list_del_init(&seqid->list); | |
1092 | if (!list_empty(&sequence->list)) { | |
1093 | struct nfs_seqid *next; | |
1094 | ||
1095 | next = list_first_entry(&sequence->list, | |
1096 | struct nfs_seqid, list); | |
1097 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1098 | } |
4601df20 | 1099 | spin_unlock(&sequence->lock); |
72211dbe TM |
1100 | } |
1101 | ||
1102 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1103 | { | |
1104 | nfs_release_seqid(seqid); | |
cee54fc9 | 1105 | kfree(seqid); |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | /* | |
cee54fc9 TM |
1109 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1110 | * failed with a seqid incrementing error - | |
16a6ddc7 | 1111 | * see comments nfs4.h:seqid_mutating_error() |
cee54fc9 | 1112 | */ |
88d90939 | 1113 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1114 | { |
1115 | switch (status) { | |
1116 | case 0: | |
1117 | break; | |
1118 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1119 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1120 | return; | |
9a3ba432 | 1121 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1122 | " sequence-id error on an" |
1123 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1124 | seqid->sequence); |
cee54fc9 TM |
1125 | case -NFS4ERR_STALE_CLIENTID: |
1126 | case -NFS4ERR_STALE_STATEID: | |
1127 | case -NFS4ERR_BAD_STATEID: | |
1128 | case -NFS4ERR_BADXDR: | |
1129 | case -NFS4ERR_RESOURCE: | |
1130 | case -NFS4ERR_NOFILEHANDLE: | |
406dab84 | 1131 | case -NFS4ERR_MOVED: |
cee54fc9 TM |
1132 | /* Non-seqid mutating errors */ |
1133 | return; | |
1134 | }; | |
1135 | /* | |
1136 | * Note: no locking needed as we are guaranteed to be first | |
1137 | * on the sequence list | |
1138 | */ | |
1139 | seqid->sequence->counter++; | |
1140 | } | |
1141 | ||
1142 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1143 | { | |
a6796419 TM |
1144 | struct nfs4_state_owner *sp; |
1145 | ||
1146 | if (seqid == NULL) | |
1147 | return; | |
34dc1ad7 | 1148 | |
a6796419 | 1149 | sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid); |
34dc1ad7 | 1150 | if (status == -NFS4ERR_BAD_SEQID) |
86cfb041 | 1151 | nfs4_reset_state_owner(sp); |
a6796419 | 1152 | if (!nfs4_has_session(sp->so_server->nfs_client)) |
34dc1ad7 | 1153 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1154 | } |
1155 | ||
1156 | /* | |
cee54fc9 TM |
1157 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1158 | * failed with a seqid incrementing error - | |
16a6ddc7 | 1159 | * see comments nfs4.h:seqid_mutating_error() |
cee54fc9 TM |
1160 | */ |
1161 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1162 | { | |
a6796419 TM |
1163 | if (seqid != NULL) |
1164 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1165 | } |
1166 | ||
1167 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1168 | { | |
a6796419 | 1169 | struct nfs_seqid_counter *sequence; |
cee54fc9 TM |
1170 | int status = 0; |
1171 | ||
a6796419 TM |
1172 | if (seqid == NULL) |
1173 | goto out; | |
1174 | sequence = seqid->sequence; | |
cee54fc9 | 1175 | spin_lock(&sequence->lock); |
4601df20 | 1176 | seqid->task = task; |
2f74c0a0 TM |
1177 | if (list_empty(&seqid->list)) |
1178 | list_add_tail(&seqid->list, &sequence->list); | |
1179 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1180 | goto unlock; | |
5d00837b | 1181 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1182 | status = -EAGAIN; |
1183 | unlock: | |
cee54fc9 | 1184 | spin_unlock(&sequence->lock); |
a6796419 | 1185 | out: |
cee54fc9 | 1186 | return status; |
1da177e4 LT |
1187 | } |
1188 | ||
e005e804 | 1189 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1190 | |
e005e804 | 1191 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c | 1192 | { |
4e857c58 | 1193 | smp_mb__before_atomic(); |
e005e804 | 1194 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
4e857c58 | 1195 | smp_mb__after_atomic(); |
e005e804 | 1196 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1197 | rpc_wake_up(&clp->cl_rpcwaitq); |
1198 | } | |
1199 | ||
1da177e4 | 1200 | /* |
e005e804 | 1201 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1202 | */ |
b0d3ded1 | 1203 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1204 | { |
5043e900 | 1205 | struct task_struct *task; |
2446ab60 | 1206 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1207 | |
aeabb3c9 | 1208 | set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
e005e804 TM |
1209 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1210 | return; | |
5043e900 | 1211 | __module_get(THIS_MODULE); |
212bf41d | 1212 | refcount_inc(&clp->cl_count); |
2446ab60 TM |
1213 | |
1214 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1215 | * manager is the only thread that ever changes the rpc_xprt | |
1216 | * after it's initialized. At this point, we're single threaded. */ | |
1217 | rcu_read_lock(); | |
1218 | snprintf(buf, sizeof(buf), "%s-manager", | |
1219 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1220 | rcu_read_unlock(); | |
f170168b | 1221 | task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
2446ab60 TM |
1222 | if (IS_ERR(task)) { |
1223 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1224 | __func__, PTR_ERR(task)); | |
1225 | nfs4_clear_state_manager_bit(clp); | |
1226 | nfs_put_client(clp); | |
1227 | module_put(THIS_MODULE); | |
1228 | } | |
1da177e4 LT |
1229 | } |
1230 | ||
1231 | /* | |
0400a6b0 | 1232 | * Schedule a lease recovery attempt |
1da177e4 | 1233 | */ |
0400a6b0 | 1234 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1235 | { |
1236 | if (!clp) | |
1237 | return; | |
e598d843 TM |
1238 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1239 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1240 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1241 | clp->cl_hostname); | |
e005e804 | 1242 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1243 | } |
9cb81968 | 1244 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1245 | |
c9fdeb28 CL |
1246 | /** |
1247 | * nfs4_schedule_migration_recovery - trigger migration recovery | |
1248 | * | |
1249 | * @server: FSID that is migrating | |
1250 | * | |
1251 | * Returns zero if recovery has started, otherwise a negative NFS4ERR | |
1252 | * value is returned. | |
1253 | */ | |
1254 | int nfs4_schedule_migration_recovery(const struct nfs_server *server) | |
1255 | { | |
1256 | struct nfs_client *clp = server->nfs_client; | |
1257 | ||
1258 | if (server->fh_expire_type != NFS4_FH_PERSISTENT) { | |
1259 | pr_err("NFS: volatile file handles not supported (server %s)\n", | |
1260 | clp->cl_hostname); | |
1261 | return -NFS4ERR_IO; | |
1262 | } | |
1263 | ||
1264 | if (test_bit(NFS_MIG_FAILED, &server->mig_status)) | |
1265 | return -NFS4ERR_IO; | |
1266 | ||
1267 | dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n", | |
1268 | __func__, | |
1269 | (unsigned long long)server->fsid.major, | |
1270 | (unsigned long long)server->fsid.minor, | |
1271 | clp->cl_hostname); | |
1272 | ||
1273 | set_bit(NFS_MIG_IN_TRANSITION, | |
1274 | &((struct nfs_server *)server)->mig_status); | |
1275 | set_bit(NFS4CLNT_MOVED, &clp->cl_state); | |
1276 | ||
1277 | nfs4_schedule_state_manager(clp); | |
1278 | return 0; | |
1279 | } | |
1280 | EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery); | |
1281 | ||
b7f7a66e CL |
1282 | /** |
1283 | * nfs4_schedule_lease_moved_recovery - start lease-moved recovery | |
1284 | * | |
1285 | * @clp: server to check for moved leases | |
1286 | * | |
1287 | */ | |
1288 | void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp) | |
1289 | { | |
1290 | dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n", | |
1291 | __func__, clp->cl_clientid, clp->cl_hostname); | |
1292 | ||
1293 | set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state); | |
1294 | nfs4_schedule_state_manager(clp); | |
1295 | } | |
1296 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery); | |
1297 | ||
33021279 TM |
1298 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1299 | { | |
1300 | int res; | |
1301 | ||
1302 | might_sleep(); | |
1303 | ||
212bf41d | 1304 | refcount_inc(&clp->cl_count); |
74316201 N |
1305 | res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, |
1306 | nfs_wait_bit_killable, TASK_KILLABLE); | |
33021279 | 1307 | if (res) |
0625c2dd | 1308 | goto out; |
33021279 | 1309 | if (clp->cl_cons_state < 0) |
0625c2dd CL |
1310 | res = clp->cl_cons_state; |
1311 | out: | |
1312 | nfs_put_client(clp); | |
1313 | return res; | |
33021279 TM |
1314 | } |
1315 | ||
1316 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1317 | { | |
1318 | unsigned int loop; | |
1319 | int ret; | |
1320 | ||
1321 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1322 | ret = nfs4_wait_clnt_recover(clp); | |
1323 | if (ret != 0) | |
1324 | break; | |
1325 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1326 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1327 | break; | |
1328 | nfs4_schedule_state_manager(clp); | |
1329 | ret = -EIO; | |
1330 | } | |
1331 | return ret; | |
1332 | } | |
1333 | ||
ad1e3968 TM |
1334 | /* |
1335 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1336 | * @clp: client to process | |
1337 | * | |
1338 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1339 | * resend of the SETCLIENTID and hence re-establish the | |
1340 | * callback channel. Then return all existing delegations. | |
1341 | */ | |
1342 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1343 | { | |
1344 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1345 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1346 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1347 | clp->cl_hostname); | |
ad1e3968 TM |
1348 | } |
1349 | ||
042b60be TM |
1350 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1351 | { | |
ad1e3968 | 1352 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1353 | nfs4_schedule_state_manager(clp); |
1354 | } | |
1355 | ||
f9feab1e | 1356 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1357 | { |
1358 | ||
7ebeb7fe TM |
1359 | if (!nfs4_valid_open_stateid(state)) |
1360 | return 0; | |
b79a4a1b TM |
1361 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
1362 | /* Don't recover state that expired before the reboot */ | |
1363 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1364 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1365 | return 0; | |
1366 | } | |
7eff03ae | 1367 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1368 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1369 | return 1; | |
1370 | } | |
1371 | ||
4f14c194 | 1372 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b | 1373 | { |
7ebeb7fe TM |
1374 | if (!nfs4_valid_open_stateid(state)) |
1375 | return 0; | |
b79a4a1b TM |
1376 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
1377 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1378 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1379 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1380 | return 1; | |
1381 | } | |
1382 | ||
5d422301 | 1383 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1384 | { |
1385 | struct nfs_client *clp = server->nfs_client; | |
1386 | ||
7ebeb7fe | 1387 | if (!nfs4_state_mark_reclaim_nograce(clp, state)) |
5d422301 | 1388 | return -EBADF; |
994b15b9 TM |
1389 | nfs_inode_find_delegation_state_and_recover(state->inode, |
1390 | &state->stateid); | |
cc0a9843 TM |
1391 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1392 | clp->cl_hostname); | |
0400a6b0 | 1393 | nfs4_schedule_state_manager(clp); |
5d422301 | 1394 | return 0; |
0400a6b0 | 1395 | } |
9cb81968 | 1396 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1397 | |
6c2d8f8d TM |
1398 | static struct nfs4_lock_state * |
1399 | nfs_state_find_lock_state_by_stateid(struct nfs4_state *state, | |
1400 | const nfs4_stateid *stateid) | |
1401 | { | |
1402 | struct nfs4_lock_state *pos; | |
1403 | ||
1404 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
1405 | if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags)) | |
1406 | continue; | |
1407 | if (nfs4_stateid_match_other(&pos->ls_stateid, stateid)) | |
1408 | return pos; | |
1409 | } | |
1410 | return NULL; | |
1411 | } | |
1412 | ||
1413 | static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state, | |
1414 | const nfs4_stateid *stateid) | |
1415 | { | |
1416 | bool found = false; | |
1417 | ||
1418 | if (test_bit(LK_STATE_IN_USE, &state->flags)) { | |
1419 | spin_lock(&state->state_lock); | |
1420 | if (nfs_state_find_lock_state_by_stateid(state, stateid)) | |
1421 | found = true; | |
1422 | spin_unlock(&state->state_lock); | |
1423 | } | |
1424 | return found; | |
1425 | } | |
1426 | ||
a1d0b5ee TM |
1427 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1428 | const nfs4_stateid *stateid) | |
1429 | { | |
1430 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1431 | struct nfs_inode *nfsi = NFS_I(inode); | |
1432 | struct nfs_open_context *ctx; | |
1433 | struct nfs4_state *state; | |
1434 | bool found = false; | |
1435 | ||
0de43976 TM |
1436 | rcu_read_lock(); |
1437 | list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { | |
a1d0b5ee TM |
1438 | state = ctx->state; |
1439 | if (state == NULL) | |
1440 | continue; | |
7ebeb7fe TM |
1441 | if (nfs4_stateid_match_other(&state->stateid, stateid) && |
1442 | nfs4_state_mark_reclaim_nograce(clp, state)) { | |
6c2d8f8d | 1443 | found = true; |
a1d0b5ee | 1444 | continue; |
6c2d8f8d | 1445 | } |
46280d9d TM |
1446 | if (nfs4_stateid_match_other(&state->open_stateid, stateid) && |
1447 | nfs4_state_mark_reclaim_nograce(clp, state)) { | |
1448 | found = true; | |
1449 | continue; | |
1450 | } | |
7ebeb7fe TM |
1451 | if (nfs_state_lock_state_matches_stateid(state, stateid) && |
1452 | nfs4_state_mark_reclaim_nograce(clp, state)) | |
6c2d8f8d | 1453 | found = true; |
a1d0b5ee | 1454 | } |
0de43976 | 1455 | rcu_read_unlock(); |
6c2d8f8d TM |
1456 | |
1457 | nfs_inode_find_delegation_state_and_recover(inode, stateid); | |
a1d0b5ee TM |
1458 | if (found) |
1459 | nfs4_schedule_state_manager(clp); | |
1460 | } | |
1461 | ||
c58c8441 TM |
1462 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1463 | { | |
1464 | struct inode *inode = state->inode; | |
1465 | struct nfs_inode *nfsi = NFS_I(inode); | |
1466 | struct nfs_open_context *ctx; | |
1467 | ||
0de43976 TM |
1468 | rcu_read_lock(); |
1469 | list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { | |
c58c8441 TM |
1470 | if (ctx->state != state) |
1471 | continue; | |
1472 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1473 | } | |
0de43976 | 1474 | rcu_read_unlock(); |
c58c8441 TM |
1475 | } |
1476 | ||
5d422301 TM |
1477 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1478 | { | |
1479 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1480 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1481 | } |
1482 | ||
a1d0b5ee | 1483 | |
02860014 | 1484 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1485 | { |
1486 | struct inode *inode = state->inode; | |
19e03c57 | 1487 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 | 1488 | struct file_lock *fl; |
dce2630c | 1489 | struct nfs4_lock_state *lsp; |
1da177e4 | 1490 | int status = 0; |
5263e31e | 1491 | struct file_lock_context *flctx = inode->i_flctx; |
bd61e0a9 | 1492 | struct list_head *list; |
1da177e4 | 1493 | |
bd61e0a9 | 1494 | if (flctx == NULL) |
3f09df70 TM |
1495 | return 0; |
1496 | ||
bd61e0a9 JL |
1497 | list = &flctx->flc_posix; |
1498 | ||
3f09df70 | 1499 | /* Guard against delegation returns and new lock/unlock calls */ |
19e03c57 | 1500 | down_write(&nfsi->rwsem); |
6109c850 | 1501 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
1502 | restart: |
1503 | list_for_each_entry(fl, list, fl_list) { | |
5263e31e JL |
1504 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1505 | continue; | |
6109c850 | 1506 | spin_unlock(&flctx->flc_lock); |
5263e31e JL |
1507 | status = ops->recover_lock(state, fl); |
1508 | switch (status) { | |
1509 | case 0: | |
1510 | break; | |
1511 | case -ESTALE: | |
1512 | case -NFS4ERR_ADMIN_REVOKED: | |
1513 | case -NFS4ERR_STALE_STATEID: | |
1514 | case -NFS4ERR_BAD_STATEID: | |
1515 | case -NFS4ERR_EXPIRED: | |
1516 | case -NFS4ERR_NO_GRACE: | |
1517 | case -NFS4ERR_STALE_CLIENTID: | |
1518 | case -NFS4ERR_BADSESSION: | |
1519 | case -NFS4ERR_BADSLOT: | |
1520 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1521 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1522 | goto out; | |
1523 | default: | |
1524 | pr_err("NFS: %s: unhandled error %d\n", | |
1525 | __func__, status); | |
01e03bdc | 1526 | /* Fall through */ |
5263e31e JL |
1527 | case -ENOMEM: |
1528 | case -NFS4ERR_DENIED: | |
1529 | case -NFS4ERR_RECLAIM_BAD: | |
1530 | case -NFS4ERR_RECLAIM_CONFLICT: | |
dce2630c N |
1531 | lsp = fl->fl_u.nfs4_fl.owner; |
1532 | if (lsp) | |
1533 | set_bit(NFS_LOCK_LOST, &lsp->ls_flags); | |
5263e31e JL |
1534 | status = 0; |
1535 | } | |
6109c850 | 1536 | spin_lock(&flctx->flc_lock); |
5263e31e | 1537 | } |
bd61e0a9 JL |
1538 | if (list == &flctx->flc_posix) { |
1539 | list = &flctx->flc_flock; | |
1540 | goto restart; | |
1541 | } | |
6109c850 | 1542 | spin_unlock(&flctx->flc_lock); |
965b5d67 | 1543 | out: |
19e03c57 | 1544 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1545 | return status; |
1546 | } | |
1547 | ||
80f42368 AS |
1548 | #ifdef CONFIG_NFS_V4_2 |
1549 | static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
1550 | { | |
1551 | struct nfs4_copy_state *copy; | |
1552 | ||
1553 | if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags)) | |
1554 | return; | |
1555 | ||
1556 | spin_lock(&sp->so_server->nfs_client->cl_lock); | |
1557 | list_for_each_entry(copy, &sp->so_server->ss_copies, copies) { | |
9aeaf8cf | 1558 | if (!nfs4_stateid_match_other(&state->stateid, ©->parent_state->stateid)) |
80f42368 AS |
1559 | continue; |
1560 | copy->flags = 1; | |
1561 | complete(©->completion); | |
1562 | break; | |
1563 | } | |
1564 | spin_unlock(&sp->so_server->nfs_client->cl_lock); | |
1565 | } | |
1566 | #else /* !CONFIG_NFS_V4_2 */ | |
1567 | static inline void nfs42_complete_copies(struct nfs4_state_owner *sp, | |
1568 | struct nfs4_state *state) | |
1569 | { | |
1570 | } | |
1571 | #endif /* CONFIG_NFS_V4_2 */ | |
1572 | ||
cb7a8384 AS |
1573 | static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state, |
1574 | const struct nfs4_state_recovery_ops *ops) | |
1575 | { | |
1576 | struct nfs4_lock_state *lock; | |
1577 | int status; | |
1578 | ||
1579 | status = ops->recover_open(sp, state); | |
1580 | if (status < 0) | |
1581 | return status; | |
1582 | ||
1583 | status = nfs4_reclaim_locks(state, ops); | |
1584 | if (status < 0) | |
1585 | return status; | |
1586 | ||
1587 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) { | |
1588 | spin_lock(&state->state_lock); | |
1589 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1590 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) | |
1591 | pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__); | |
1592 | } | |
1593 | spin_unlock(&state->state_lock); | |
1594 | } | |
1595 | ||
80f42368 | 1596 | nfs42_complete_copies(sp, state); |
cb7a8384 AS |
1597 | clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
1598 | return status; | |
1599 | } | |
1600 | ||
02860014 | 1601 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1602 | { |
1603 | struct nfs4_state *state; | |
1da177e4 LT |
1604 | int status = 0; |
1605 | ||
1606 | /* Note: we rely on the sp->so_states list being ordered | |
1607 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1608 | * states first. | |
1609 | * This is needed to ensure that the server won't give us any | |
1610 | * read delegations that we have to return if, say, we are | |
1611 | * recovering after a network partition or a reboot from a | |
1612 | * server that doesn't support a grace period. | |
1613 | */ | |
fe1d8195 | 1614 | spin_lock(&sp->so_lock); |
abbec2da | 1615 | raw_write_seqcount_begin(&sp->so_reclaim_seqcount); |
c137afab | 1616 | restart: |
1da177e4 | 1617 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1618 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1619 | continue; | |
5d422301 TM |
1620 | if (!nfs4_valid_open_stateid(state)) |
1621 | continue; | |
1da177e4 LT |
1622 | if (state->state == 0) |
1623 | continue; | |
ace9fad4 | 1624 | refcount_inc(&state->count); |
fe1d8195 | 1625 | spin_unlock(&sp->so_lock); |
cb7a8384 | 1626 | status = __nfs4_reclaim_open_state(sp, state, ops); |
cb7a8384 | 1627 | |
1da177e4 | 1628 | switch (status) { |
35a61606 AS |
1629 | default: |
1630 | if (status >= 0) | |
b79a4a1b | 1631 | break; |
35a61606 AS |
1632 | printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status); |
1633 | /* Fall through */ | |
1634 | case -ENOENT: | |
1635 | case -ENOMEM: | |
1636 | case -EACCES: | |
1637 | case -EROFS: | |
1638 | case -EIO: | |
1639 | case -ESTALE: | |
1640 | /* Open state on this file cannot be recovered */ | |
1641 | nfs4_state_mark_recovery_failed(state, status); | |
1642 | break; | |
1643 | case -EAGAIN: | |
1644 | ssleep(1); | |
1645 | /* Fall through */ | |
1646 | case -NFS4ERR_ADMIN_REVOKED: | |
1647 | case -NFS4ERR_STALE_STATEID: | |
1648 | case -NFS4ERR_OLD_STATEID: | |
1649 | case -NFS4ERR_BAD_STATEID: | |
1650 | case -NFS4ERR_RECLAIM_BAD: | |
1651 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1652 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1653 | break; | |
1654 | case -NFS4ERR_EXPIRED: | |
1655 | case -NFS4ERR_NO_GRACE: | |
1656 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1657 | case -NFS4ERR_STALE_CLIENTID: | |
1658 | case -NFS4ERR_BADSESSION: | |
1659 | case -NFS4ERR_BADSLOT: | |
1660 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1661 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1662 | goto out_err; | |
1da177e4 | 1663 | } |
fe1d8195 | 1664 | nfs4_put_open_state(state); |
c137afab | 1665 | spin_lock(&sp->so_lock); |
fe1d8195 | 1666 | goto restart; |
1da177e4 | 1667 | } |
abbec2da | 1668 | raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1669 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1670 | return 0; |
1671 | out_err: | |
fe1d8195 | 1672 | nfs4_put_open_state(state); |
c137afab | 1673 | spin_lock(&sp->so_lock); |
abbec2da | 1674 | raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
c137afab | 1675 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1676 | return status; |
1677 | } | |
1678 | ||
b79a4a1b TM |
1679 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1680 | { | |
1681 | struct nfs4_lock_state *lock; | |
1682 | ||
1683 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1684 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1685 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1686 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1687 | spin_lock(&state->state_lock); |
b79a4a1b | 1688 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1689 | lock->ls_seqid.flags = 0; |
795a88c9 | 1690 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1691 | } |
4b44b40e | 1692 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1693 | } |
1694 | ||
24d292b8 CL |
1695 | static void nfs4_reset_seqids(struct nfs_server *server, |
1696 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1697 | { |
24d292b8 | 1698 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1699 | struct nfs4_state_owner *sp; |
9f958ab8 | 1700 | struct rb_node *pos; |
cee54fc9 | 1701 | struct nfs4_state *state; |
cee54fc9 | 1702 | |
24d292b8 CL |
1703 | spin_lock(&clp->cl_lock); |
1704 | for (pos = rb_first(&server->state_owners); | |
1705 | pos != NULL; | |
1706 | pos = rb_next(pos)) { | |
1707 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1708 | sp->so_seqid.flags = 0; |
ec073428 | 1709 | spin_lock(&sp->so_lock); |
cee54fc9 | 1710 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1711 | if (mark_reclaim(clp, state)) |
1712 | nfs4_clear_open_state(state); | |
cee54fc9 | 1713 | } |
ec073428 | 1714 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1715 | } |
24d292b8 CL |
1716 | spin_unlock(&clp->cl_lock); |
1717 | } | |
1718 | ||
1719 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1720 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1721 | { | |
1722 | struct nfs_server *server; | |
1723 | ||
1724 | rcu_read_lock(); | |
1725 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1726 | nfs4_reset_seqids(server, mark_reclaim); | |
1727 | rcu_read_unlock(); | |
cee54fc9 TM |
1728 | } |
1729 | ||
b79a4a1b TM |
1730 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1731 | { | |
1732 | /* Mark all delegations for reclaim */ | |
1733 | nfs_delegation_mark_reclaim(clp); | |
1734 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1735 | } | |
1736 | ||
0048fdd0 | 1737 | static int nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 | 1738 | const struct nfs4_state_recovery_ops *ops, |
a52458b4 | 1739 | const struct cred *cred) |
fce5c838 RL |
1740 | { |
1741 | /* Notify the server we're done reclaiming our state */ | |
1742 | if (ops->reclaim_complete) | |
0048fdd0 TM |
1743 | return ops->reclaim_complete(clp, cred); |
1744 | return 0; | |
fce5c838 RL |
1745 | } |
1746 | ||
24d292b8 | 1747 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1748 | { |
24d292b8 | 1749 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1750 | struct nfs4_state_owner *sp; |
1751 | struct rb_node *pos; | |
1752 | struct nfs4_state *state; | |
1753 | ||
24d292b8 CL |
1754 | spin_lock(&clp->cl_lock); |
1755 | for (pos = rb_first(&server->state_owners); | |
1756 | pos != NULL; | |
1757 | pos = rb_next(pos)) { | |
1758 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1759 | spin_lock(&sp->so_lock); |
1760 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1761 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1762 | &state->flags)) | |
b79a4a1b TM |
1763 | continue; |
1764 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1765 | } | |
1766 | spin_unlock(&sp->so_lock); | |
1767 | } | |
24d292b8 CL |
1768 | spin_unlock(&clp->cl_lock); |
1769 | } | |
1770 | ||
1771 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1772 | { | |
1773 | struct nfs_server *server; | |
1774 | ||
1775 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1776 | return 0; | |
1777 | ||
1778 | rcu_read_lock(); | |
1779 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1780 | nfs4_clear_reclaim_server(server); | |
1781 | rcu_read_unlock(); | |
b79a4a1b TM |
1782 | |
1783 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1784 | return 1; |
1785 | } | |
1786 | ||
1787 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1788 | { | |
965e9c23 | 1789 | const struct nfs4_state_recovery_ops *ops; |
a52458b4 | 1790 | const struct cred *cred; |
0048fdd0 | 1791 | int err; |
965e9c23 | 1792 | |
6eaa6149 TM |
1793 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1794 | return; | |
965e9c23 | 1795 | ops = clp->cl_mvops->reboot_recovery_ops; |
73d8bde5 | 1796 | cred = nfs4_get_clid_cred(clp); |
0048fdd0 | 1797 | err = nfs4_reclaim_complete(clp, ops, cred); |
a52458b4 | 1798 | put_cred(cred); |
0048fdd0 TM |
1799 | if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION) |
1800 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
b79a4a1b TM |
1801 | } |
1802 | ||
b79a4a1b TM |
1803 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
1804 | { | |
45870d69 | 1805 | nfs_mark_test_expired_all_delegations(clp); |
b79a4a1b TM |
1806 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
1807 | } | |
1808 | ||
4f7cdf18 | 1809 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1810 | { |
1811 | switch (error) { | |
000d3f95 AS |
1812 | case 0: |
1813 | break; | |
1814 | case -NFS4ERR_CB_PATH_DOWN: | |
1815 | nfs40_handle_cb_pathdown(clp); | |
1816 | break; | |
1817 | case -NFS4ERR_NO_GRACE: | |
1818 | nfs4_state_end_reclaim_reboot(clp); | |
1819 | break; | |
1820 | case -NFS4ERR_STALE_CLIENTID: | |
1821 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1822 | nfs4_state_start_reclaim_reboot(clp); | |
1823 | break; | |
1824 | case -NFS4ERR_EXPIRED: | |
1825 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1826 | nfs4_state_start_reclaim_nograce(clp); | |
1827 | break; | |
1828 | case -NFS4ERR_BADSESSION: | |
1829 | case -NFS4ERR_BADSLOT: | |
1830 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1831 | case -NFS4ERR_DEADSESSION: | |
1832 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1833 | case -NFS4ERR_SEQ_MISORDERED: | |
1834 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1835 | /* Zero session reset errors */ | |
1836 | break; | |
1837 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1838 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1839 | break; | |
1840 | default: | |
1841 | dprintk("%s: failed to handle error %d for server %s\n", | |
1842 | __func__, error, clp->cl_hostname); | |
1843 | return error; | |
e598d843 | 1844 | } |
cc0a9843 TM |
1845 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1846 | clp->cl_hostname); | |
4f38e4aa | 1847 | return 0; |
e598d843 TM |
1848 | } |
1849 | ||
02860014 | 1850 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1851 | { |
24d292b8 CL |
1852 | struct nfs4_state_owner *sp; |
1853 | struct nfs_server *server; | |
9f958ab8 | 1854 | struct rb_node *pos; |
1da177e4 LT |
1855 | int status = 0; |
1856 | ||
7eff03ae | 1857 | restart: |
24d292b8 CL |
1858 | rcu_read_lock(); |
1859 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1860 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1861 | spin_lock(&clp->cl_lock); |
1862 | for (pos = rb_first(&server->state_owners); | |
1863 | pos != NULL; | |
1864 | pos = rb_next(pos)) { | |
1865 | sp = rb_entry(pos, | |
1866 | struct nfs4_state_owner, so_server_node); | |
1867 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1868 | &sp->so_flags)) | |
1869 | continue; | |
4a0954ef TM |
1870 | if (!atomic_inc_not_zero(&sp->so_count)) |
1871 | continue; | |
24d292b8 CL |
1872 | spin_unlock(&clp->cl_lock); |
1873 | rcu_read_unlock(); | |
1874 | ||
1875 | status = nfs4_reclaim_open_state(sp, ops); | |
1876 | if (status < 0) { | |
1877 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1878 | nfs4_put_state_owner(sp); | |
df817ba3 TM |
1879 | status = nfs4_recovery_handle_error(clp, status); |
1880 | return (status != 0) ? status : -EAGAIN; | |
24d292b8 CL |
1881 | } |
1882 | ||
7eff03ae | 1883 | nfs4_put_state_owner(sp); |
24d292b8 | 1884 | goto restart; |
7eff03ae | 1885 | } |
24d292b8 | 1886 | spin_unlock(&clp->cl_lock); |
02860014 | 1887 | } |
24d292b8 | 1888 | rcu_read_unlock(); |
df817ba3 | 1889 | return 0; |
02860014 TM |
1890 | } |
1891 | ||
1892 | static int nfs4_check_lease(struct nfs_client *clp) | |
1893 | { | |
a52458b4 | 1894 | const struct cred *cred; |
c48f4f35 TM |
1895 | const struct nfs4_state_maintenance_ops *ops = |
1896 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1897 | int status; |
1da177e4 | 1898 | |
0f605b56 TM |
1899 | /* Is the client already known to have an expired lease? */ |
1900 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1901 | return 0; | |
f15e1e8b | 1902 | cred = ops->get_state_renewal_cred(clp); |
0f605b56 | 1903 | if (cred == NULL) { |
73d8bde5 | 1904 | cred = nfs4_get_clid_cred(clp); |
4f38e4aa | 1905 | status = -ENOKEY; |
0f605b56 TM |
1906 | if (cred == NULL) |
1907 | goto out; | |
286d7d6a | 1908 | } |
8e69514f | 1909 | status = ops->renew_lease(clp, cred); |
a52458b4 | 1910 | put_cred(cred); |
bc7a05ca TM |
1911 | if (status == -ETIMEDOUT) { |
1912 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1913 | return 0; | |
1914 | } | |
0f605b56 | 1915 | out: |
4f7cdf18 | 1916 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1917 | } |
1918 | ||
47b803c8 AA |
1919 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1920 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1921 | */ |
1922 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1923 | { | |
1924 | switch (status) { | |
89a21736 TM |
1925 | case -NFS4ERR_SEQ_MISORDERED: |
1926 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1927 | return -ESERVERFAULT; | |
1928 | /* Lease confirmation error: retry after purging the lease */ | |
1929 | ssleep(1); | |
47b803c8 AA |
1930 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1931 | break; | |
2a6ee6aa TM |
1932 | case -NFS4ERR_STALE_CLIENTID: |
1933 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 | 1934 | nfs4_state_start_reclaim_reboot(clp); |
2a6ee6aa | 1935 | break; |
de734831 CL |
1936 | case -NFS4ERR_CLID_INUSE: |
1937 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1938 | clp->cl_hostname); | |
1939 | nfs_mark_client_ready(clp, -EPERM); | |
1940 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1941 | return -EPERM; | |
2a6ee6aa | 1942 | case -EACCES: |
2a6ee6aa TM |
1943 | case -NFS4ERR_DELAY: |
1944 | case -ETIMEDOUT: | |
1945 | case -EAGAIN: | |
1946 | ssleep(1); | |
1947 | break; | |
1948 | ||
1949 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1950 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1951 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1952 | dprintk("%s: exit with error %d for server %s\n", |
1953 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1954 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1955 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1956 | * in nfs4_exchange_id */ | |
1957 | default: | |
cc0a9843 TM |
1958 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1959 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1960 | return status; |
1961 | } | |
1962 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1963 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1964 | clp->cl_hostname); | |
2a6ee6aa TM |
1965 | return 0; |
1966 | } | |
1967 | ||
b42353ff | 1968 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 | 1969 | { |
a52458b4 | 1970 | const struct cred *cred; |
c48f4f35 TM |
1971 | const struct nfs4_state_recovery_ops *ops = |
1972 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1973 | int status; |
02860014 | 1974 | |
8aafd2fd TM |
1975 | status = nfs4_begin_drain_session(clp); |
1976 | if (status != 0) | |
1977 | return status; | |
73d8bde5 | 1978 | cred = nfs4_get_clid_cred(clp); |
2a6ee6aa TM |
1979 | if (cred == NULL) |
1980 | return -ENOENT; | |
1981 | status = ops->establish_clid(clp, cred); | |
a52458b4 | 1982 | put_cred(cred); |
2a6ee6aa | 1983 | if (status != 0) |
b42353ff TM |
1984 | return status; |
1985 | pnfs_destroy_all_layouts(clp); | |
1986 | return 0; | |
1987 | } | |
1988 | ||
6bbb4ae8 CL |
1989 | /* |
1990 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1991 | * to local errno values. | |
1992 | */ | |
b42353ff TM |
1993 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1994 | { | |
1995 | int status; | |
1996 | ||
1997 | status = nfs4_establish_lease(clp); | |
1998 | if (status < 0) | |
1999 | return nfs4_handle_reclaim_lease_error(clp, status); | |
2000 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
2001 | nfs4_state_start_reclaim_nograce(clp); | |
2002 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
2003 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
2004 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
2005 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
2006 | return 0; | |
2007 | } | |
2008 | ||
2009 | static int nfs4_purge_lease(struct nfs_client *clp) | |
2010 | { | |
2011 | int status; | |
2012 | ||
2013 | status = nfs4_establish_lease(clp); | |
2014 | if (status < 0) | |
2a6ee6aa | 2015 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
2016 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
2017 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
2018 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 2019 | return 0; |
02860014 TM |
2020 | } |
2021 | ||
c9fdeb28 CL |
2022 | /* |
2023 | * Try remote migration of one FSID from a source server to a | |
2024 | * destination server. The source server provides a list of | |
2025 | * potential destinations. | |
2026 | * | |
2027 | * Returns zero or a negative NFS4ERR status code. | |
2028 | */ | |
a52458b4 | 2029 | static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred) |
c9fdeb28 CL |
2030 | { |
2031 | struct nfs_client *clp = server->nfs_client; | |
2032 | struct nfs4_fs_locations *locations = NULL; | |
2033 | struct inode *inode; | |
2034 | struct page *page; | |
2035 | int status, result; | |
2036 | ||
2037 | dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__, | |
2038 | (unsigned long long)server->fsid.major, | |
2039 | (unsigned long long)server->fsid.minor, | |
2040 | clp->cl_hostname); | |
2041 | ||
2042 | result = 0; | |
2043 | page = alloc_page(GFP_KERNEL); | |
2044 | locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); | |
2045 | if (page == NULL || locations == NULL) { | |
2046 | dprintk("<-- %s: no memory\n", __func__); | |
2047 | goto out; | |
2048 | } | |
2049 | ||
2b0143b5 | 2050 | inode = d_inode(server->super->s_root); |
c9fdeb28 CL |
2051 | result = nfs4_proc_get_locations(inode, locations, page, cred); |
2052 | if (result) { | |
2053 | dprintk("<-- %s: failed to retrieve fs_locations: %d\n", | |
2054 | __func__, result); | |
2055 | goto out; | |
2056 | } | |
2057 | ||
2058 | result = -NFS4ERR_NXIO; | |
2059 | if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) { | |
2060 | dprintk("<-- %s: No fs_locations data, migration skipped\n", | |
2061 | __func__); | |
2062 | goto out; | |
2063 | } | |
2064 | ||
8aafd2fd TM |
2065 | status = nfs4_begin_drain_session(clp); |
2066 | if (status != 0) | |
2067 | return status; | |
c9fdeb28 CL |
2068 | |
2069 | status = nfs4_replace_transport(server, locations); | |
2070 | if (status != 0) { | |
2071 | dprintk("<-- %s: failed to replace transport: %d\n", | |
2072 | __func__, status); | |
2073 | goto out; | |
2074 | } | |
2075 | ||
2076 | result = 0; | |
2077 | dprintk("<-- %s: migration succeeded\n", __func__); | |
2078 | ||
2079 | out: | |
2080 | if (page != NULL) | |
2081 | __free_page(page); | |
2082 | kfree(locations); | |
2083 | if (result) { | |
2084 | pr_err("NFS: migration recovery failed (server %s)\n", | |
2085 | clp->cl_hostname); | |
2086 | set_bit(NFS_MIG_FAILED, &server->mig_status); | |
2087 | } | |
2088 | return result; | |
2089 | } | |
2090 | ||
2091 | /* | |
2092 | * Returns zero or a negative NFS4ERR status code. | |
2093 | */ | |
2094 | static int nfs4_handle_migration(struct nfs_client *clp) | |
2095 | { | |
2096 | const struct nfs4_state_maintenance_ops *ops = | |
2097 | clp->cl_mvops->state_renewal_ops; | |
2098 | struct nfs_server *server; | |
a52458b4 | 2099 | const struct cred *cred; |
c9fdeb28 CL |
2100 | |
2101 | dprintk("%s: migration reported on \"%s\"\n", __func__, | |
2102 | clp->cl_hostname); | |
2103 | ||
f15e1e8b | 2104 | cred = ops->get_state_renewal_cred(clp); |
c9fdeb28 CL |
2105 | if (cred == NULL) |
2106 | return -NFS4ERR_NOENT; | |
2107 | ||
2108 | clp->cl_mig_gen++; | |
2109 | restart: | |
2110 | rcu_read_lock(); | |
2111 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
2112 | int status; | |
2113 | ||
2114 | if (server->mig_gen == clp->cl_mig_gen) | |
2115 | continue; | |
2116 | server->mig_gen = clp->cl_mig_gen; | |
2117 | ||
2118 | if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION, | |
2119 | &server->mig_status)) | |
2120 | continue; | |
2121 | ||
2122 | rcu_read_unlock(); | |
2123 | status = nfs4_try_migration(server, cred); | |
2124 | if (status < 0) { | |
a52458b4 | 2125 | put_cred(cred); |
c9fdeb28 CL |
2126 | return status; |
2127 | } | |
2128 | goto restart; | |
2129 | } | |
2130 | rcu_read_unlock(); | |
a52458b4 | 2131 | put_cred(cred); |
c9fdeb28 CL |
2132 | return 0; |
2133 | } | |
2134 | ||
b7f7a66e CL |
2135 | /* |
2136 | * Test each nfs_server on the clp's cl_superblocks list to see | |
2137 | * if it's moved to another server. Stop when the server no longer | |
2138 | * returns NFS4ERR_LEASE_MOVED. | |
2139 | */ | |
2140 | static int nfs4_handle_lease_moved(struct nfs_client *clp) | |
2141 | { | |
2142 | const struct nfs4_state_maintenance_ops *ops = | |
2143 | clp->cl_mvops->state_renewal_ops; | |
2144 | struct nfs_server *server; | |
a52458b4 | 2145 | const struct cred *cred; |
b7f7a66e CL |
2146 | |
2147 | dprintk("%s: lease moved reported on \"%s\"\n", __func__, | |
2148 | clp->cl_hostname); | |
2149 | ||
f15e1e8b | 2150 | cred = ops->get_state_renewal_cred(clp); |
b7f7a66e CL |
2151 | if (cred == NULL) |
2152 | return -NFS4ERR_NOENT; | |
2153 | ||
2154 | clp->cl_mig_gen++; | |
2155 | restart: | |
2156 | rcu_read_lock(); | |
2157 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
2158 | struct inode *inode; | |
2159 | int status; | |
2160 | ||
2161 | if (server->mig_gen == clp->cl_mig_gen) | |
2162 | continue; | |
2163 | server->mig_gen = clp->cl_mig_gen; | |
2164 | ||
2165 | rcu_read_unlock(); | |
2166 | ||
2b0143b5 | 2167 | inode = d_inode(server->super->s_root); |
b7f7a66e CL |
2168 | status = nfs4_proc_fsid_present(inode, cred); |
2169 | if (status != -NFS4ERR_MOVED) | |
2170 | goto restart; /* wasn't this one */ | |
2171 | if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED) | |
2172 | goto restart; /* there are more */ | |
2173 | goto out; | |
2174 | } | |
2175 | rcu_read_unlock(); | |
2176 | ||
2177 | out: | |
a52458b4 | 2178 | put_cred(cred); |
b7f7a66e CL |
2179 | return 0; |
2180 | } | |
2181 | ||
05f4c350 CL |
2182 | /** |
2183 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
2184 | * | |
2185 | * @clp: nfs_client under test | |
2186 | * @result: OUT: found nfs_client, or clp | |
2187 | * | |
2188 | * Returns zero or a negative errno. If zero is returned, | |
2189 | * an nfs_client pointer is planted in "result". | |
2190 | * | |
2191 | * Note: since we are invoked in process context, and | |
2192 | * not from inside the state manager, we cannot use | |
2193 | * nfs4_handle_reclaim_lease_error(). | |
2194 | */ | |
2195 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
2196 | struct nfs_client **result) | |
2197 | { | |
2198 | const struct nfs4_state_recovery_ops *ops = | |
2199 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 | 2200 | struct rpc_clnt *clnt; |
a52458b4 | 2201 | const struct cred *cred; |
4edaa308 | 2202 | int i, status; |
05f4c350 CL |
2203 | |
2204 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
2205 | ||
05f4c350 | 2206 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
2207 | i = 0; |
2208 | ||
2209 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 2210 | again: |
ea33e6c3 | 2211 | status = -ENOENT; |
73d8bde5 | 2212 | cred = nfs4_get_clid_cred(clp); |
05f4c350 CL |
2213 | if (cred == NULL) |
2214 | goto out_unlock; | |
2215 | ||
2216 | status = ops->detect_trunking(clp, result, cred); | |
a52458b4 | 2217 | put_cred(cred); |
05f4c350 CL |
2218 | switch (status) { |
2219 | case 0: | |
898fc11b TM |
2220 | case -EINTR: |
2221 | case -ERESTARTSYS: | |
05f4c350 | 2222 | break; |
05f4c350 | 2223 | case -ETIMEDOUT: |
150e7260 TM |
2224 | if (clnt->cl_softrtry) |
2225 | break; | |
01e03bdc | 2226 | /* Fall through */ |
150e7260 | 2227 | case -NFS4ERR_DELAY: |
05f4c350 CL |
2228 | case -EAGAIN: |
2229 | ssleep(1); | |
01e03bdc | 2230 | /* Fall through */ |
202c312d | 2231 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
2232 | dprintk("NFS: %s after status %d, retrying\n", |
2233 | __func__, status); | |
2234 | goto again; | |
4edaa308 | 2235 | case -EACCES: |
d688f7b8 CL |
2236 | if (i++ == 0) { |
2237 | nfs4_root_machine_cred(clp); | |
2238 | goto again; | |
2239 | } | |
6d769f1e | 2240 | if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) |
4edaa308 | 2241 | break; |
01e03bdc | 2242 | /* Fall through */ |
05f4c350 CL |
2243 | case -NFS4ERR_CLID_INUSE: |
2244 | case -NFS4ERR_WRONGSEC: | |
6d769f1e JL |
2245 | /* No point in retrying if we already used RPC_AUTH_UNIX */ |
2246 | if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) { | |
2247 | status = -EPERM; | |
2248 | break; | |
2249 | } | |
79d852bf | 2250 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
2251 | if (IS_ERR(clnt)) { |
2252 | status = PTR_ERR(clnt); | |
2253 | break; | |
2254 | } | |
b193d59a TM |
2255 | /* Note: this is safe because we haven't yet marked the |
2256 | * client as ready, so we are the only user of | |
2257 | * clp->cl_rpcclient | |
2258 | */ | |
2259 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
2260 | rpc_shutdown_client(clnt); | |
2261 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
2262 | goto again; |
2263 | ||
2264 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
2265 | status = -EPROTONOSUPPORT; | |
2266 | break; | |
2267 | ||
2268 | case -EKEYEXPIRED: | |
05f4c350 CL |
2269 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
2270 | * in nfs4_exchange_id */ | |
2271 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
2272 | break; |
2273 | default: | |
2274 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
2275 | __func__, status); | |
2276 | status = -EIO; | |
05f4c350 CL |
2277 | } |
2278 | ||
2279 | out_unlock: | |
2280 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
2281 | dprintk("NFS: %s: status = %d\n", __func__, status); |
2282 | return status; | |
2283 | } | |
2284 | ||
76db6d95 | 2285 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 2286 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 2287 | { |
444f72fe TM |
2288 | struct nfs_client *clp = session->clp; |
2289 | ||
9f594791 TM |
2290 | switch (err) { |
2291 | default: | |
2292 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2293 | break; | |
2294 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
2295 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2296 | } | |
d94cbf6c | 2297 | nfs4_schedule_state_manager(clp); |
0400a6b0 | 2298 | } |
cbdabc7f | 2299 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 2300 | |
3f10a6af | 2301 | void nfs41_notify_server(struct nfs_client *clp) |
ac074835 TM |
2302 | { |
2303 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
2304 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
2305 | nfs4_schedule_state_manager(clp); | |
2306 | } | |
2307 | ||
0f79fd6f TM |
2308 | static void nfs4_reset_all_state(struct nfs_client *clp) |
2309 | { | |
2310 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 2311 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 2312 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 2313 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
2314 | dprintk("%s: scheduling reset of all state for server %s!\n", |
2315 | __func__, clp->cl_hostname); | |
0400a6b0 | 2316 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
2317 | } |
2318 | } | |
2319 | ||
2320 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
2321 | { | |
2322 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2323 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
2324 | dprintk("%s: server %s rebooted!\n", __func__, |
2325 | clp->cl_hostname); | |
0400a6b0 | 2326 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
2327 | } |
2328 | } | |
2329 | ||
8b895ce6 | 2330 | static void nfs41_handle_all_state_revoked(struct nfs_client *clp) |
0f79fd6f | 2331 | { |
0f79fd6f | 2332 | nfs4_reset_all_state(clp); |
cc0a9843 | 2333 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
2334 | } |
2335 | ||
8b895ce6 TM |
2336 | static void nfs41_handle_some_state_revoked(struct nfs_client *clp) |
2337 | { | |
45870d69 | 2338 | nfs4_state_start_reclaim_nograce(clp); |
8b895ce6 TM |
2339 | nfs4_schedule_state_manager(clp); |
2340 | ||
2341 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); | |
2342 | } | |
2343 | ||
0f79fd6f TM |
2344 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) |
2345 | { | |
4099287f TM |
2346 | /* FIXME: For now, we destroy all layouts. */ |
2347 | pnfs_destroy_all_layouts(clp); | |
2348 | /* FIXME: For now, we test all delegations+open state+locks. */ | |
2349 | nfs41_handle_some_state_revoked(clp); | |
cc0a9843 TM |
2350 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
2351 | clp->cl_hostname); | |
0f79fd6f TM |
2352 | } |
2353 | ||
a9e64442 | 2354 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f | 2355 | { |
b1352905 TM |
2356 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
2357 | nfs4_schedule_state_manager(clp); | |
2358 | ||
cc0a9843 TM |
2359 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
2360 | clp->cl_hostname); | |
0f79fd6f TM |
2361 | } |
2362 | ||
a9e64442 WAA |
2363 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
2364 | { | |
2365 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
2366 | &clp->cl_state) == 0) | |
2367 | nfs4_schedule_state_manager(clp); | |
2368 | } | |
2369 | ||
0a014a44 TM |
2370 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, |
2371 | bool recovery) | |
0629e370 AB |
2372 | { |
2373 | if (!flags) | |
2374 | return; | |
2c820d9a CL |
2375 | |
2376 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2377 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
0a014a44 TM |
2378 | /* |
2379 | * If we're called from the state manager thread, then assume we're | |
2380 | * already handling the RECLAIM_NEEDED and/or STATE_REVOKED. | |
2381 | * Those flags are expected to remain set until we're done | |
2382 | * recovering (see RFC5661, section 18.46.3). | |
2383 | */ | |
2384 | if (recovery) | |
2385 | goto out_recovery; | |
2c820d9a | 2386 | |
111d489f | 2387 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2388 | nfs41_handle_server_reboot(clp); |
8b895ce6 TM |
2389 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED)) |
2390 | nfs41_handle_all_state_revoked(clp); | |
2391 | if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | | |
d1c2331e | 2392 | SEQ4_STATUS_ADMIN_STATE_REVOKED)) |
8b895ce6 | 2393 | nfs41_handle_some_state_revoked(clp); |
d1c2331e CL |
2394 | if (flags & SEQ4_STATUS_LEASE_MOVED) |
2395 | nfs4_schedule_lease_moved_recovery(clp); | |
111d489f | 2396 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2397 | nfs41_handle_recallable_state_revoked(clp); |
0a014a44 | 2398 | out_recovery: |
a9e64442 WAA |
2399 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2400 | nfs41_handle_backchannel_fault(clp); | |
2401 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2402 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2403 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2404 | } |
2405 | ||
c3fad1b1 AA |
2406 | static int nfs4_reset_session(struct nfs_client *clp) |
2407 | { | |
a52458b4 | 2408 | const struct cred *cred; |
c3fad1b1 AA |
2409 | int status; |
2410 | ||
1a47e7a6 TM |
2411 | if (!nfs4_has_session(clp)) |
2412 | return 0; | |
8aafd2fd TM |
2413 | status = nfs4_begin_drain_session(clp); |
2414 | if (status != 0) | |
2415 | return status; | |
73d8bde5 | 2416 | cred = nfs4_get_clid_cred(clp); |
848f5bda | 2417 | status = nfs4_proc_destroy_session(clp->cl_session, cred); |
c489ee29 TM |
2418 | switch (status) { |
2419 | case 0: | |
2420 | case -NFS4ERR_BADSESSION: | |
2421 | case -NFS4ERR_DEADSESSION: | |
2422 | break; | |
2423 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2424 | case -NFS4ERR_DELAY: | |
2425 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2426 | status = 0; | |
2427 | ssleep(1); | |
2428 | goto out; | |
2429 | default: | |
f455848a | 2430 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2431 | goto out; |
2432 | } | |
2433 | ||
2434 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2435 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2436 | if (status) { |
cc0a9843 TM |
2437 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2438 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2439 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2440 | goto out; |
2441 | } | |
bda197f5 | 2442 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2443 | dprintk("%s: session reset was successful for server %s!\n", |
2444 | __func__, clp->cl_hostname); | |
41f54a55 | 2445 | out: |
a52458b4 | 2446 | put_cred(cred); |
c3fad1b1 AA |
2447 | return status; |
2448 | } | |
76db6d95 | 2449 | |
a9e64442 WAA |
2450 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2451 | { | |
a52458b4 | 2452 | const struct cred *cred; |
2cf047c9 TM |
2453 | int ret; |
2454 | ||
1a47e7a6 TM |
2455 | if (!nfs4_has_session(clp)) |
2456 | return 0; | |
8aafd2fd TM |
2457 | ret = nfs4_begin_drain_session(clp); |
2458 | if (ret != 0) | |
2459 | return ret; | |
73d8bde5 | 2460 | cred = nfs4_get_clid_cred(clp); |
2cf047c9 | 2461 | ret = nfs4_proc_bind_conn_to_session(clp, cred); |
a52458b4 | 2462 | put_cred(cred); |
43ac544c | 2463 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2464 | switch (ret) { |
2465 | case 0: | |
cc0a9843 TM |
2466 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2467 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2468 | break; |
2469 | case -NFS4ERR_DELAY: | |
2470 | ssleep(1); | |
2471 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2472 | break; | |
2473 | default: | |
2474 | return nfs4_recovery_handle_error(clp, ret); | |
2475 | } | |
2476 | return 0; | |
a9e64442 | 2477 | } |
76db6d95 | 2478 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2479 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
2480 | |
2481 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2482 | { | |
2483 | return 0; | |
2484 | } | |
76db6d95 AA |
2485 | #endif /* CONFIG_NFS_V4_1 */ |
2486 | ||
e005e804 | 2487 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2488 | { |
02860014 | 2489 | int status = 0; |
8ed27d4f | 2490 | const char *section = "", *section_sep = ""; |
02860014 | 2491 | |
02860014 | 2492 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2493 | do { |
aeabb3c9 | 2494 | clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
2c820d9a | 2495 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2496 | section = "purge state"; |
b42353ff | 2497 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2498 | if (status < 0) |
2499 | goto out_error; | |
b42353ff | 2500 | continue; |
2c820d9a CL |
2501 | } |
2502 | ||
b42353ff | 2503 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2504 | section = "lease expired"; |
b79a4a1b TM |
2505 | /* We're going to have to re-establish a clientid */ |
2506 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2507 | if (status < 0) |
b79a4a1b | 2508 | goto out_error; |
b42353ff | 2509 | continue; |
e598d843 TM |
2510 | } |
2511 | ||
c3fad1b1 | 2512 | /* Initialize or reset the session */ |
1a47e7a6 | 2513 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2514 | section = "reset session"; |
4d643d1d | 2515 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2516 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2517 | continue; | |
2518 | if (status < 0) | |
76db6d95 | 2519 | goto out_error; |
76db6d95 | 2520 | } |
b6d408ba | 2521 | |
a9e64442 WAA |
2522 | /* Send BIND_CONN_TO_SESSION */ |
2523 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2524 | &clp->cl_state)) { |
8ed27d4f | 2525 | section = "bind conn to session"; |
a9e64442 WAA |
2526 | status = nfs4_bind_conn_to_session(clp); |
2527 | if (status < 0) | |
2528 | goto out_error; | |
bf674c82 | 2529 | continue; |
a9e64442 WAA |
2530 | } |
2531 | ||
5df904ae TM |
2532 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2533 | section = "check lease"; | |
2534 | status = nfs4_check_lease(clp); | |
2535 | if (status < 0) | |
2536 | goto out_error; | |
8faaa6d5 | 2537 | continue; |
c9fdeb28 CL |
2538 | } |
2539 | ||
2540 | if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) { | |
2541 | section = "migration"; | |
2542 | status = nfs4_handle_migration(clp); | |
2543 | if (status < 0) | |
2544 | goto out_error; | |
5df904ae TM |
2545 | } |
2546 | ||
b7f7a66e CL |
2547 | if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) { |
2548 | section = "lease moved"; | |
2549 | status = nfs4_handle_lease_moved(clp); | |
2550 | if (status < 0) | |
2551 | goto out_error; | |
2552 | } | |
2553 | ||
b79a4a1b | 2554 | /* First recover reboot state... */ |
e345e88a | 2555 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2556 | section = "reclaim reboot"; |
591d71cb | 2557 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2558 | clp->cl_mvops->reboot_recovery_ops); |
df817ba3 | 2559 | if (status == -EAGAIN) |
b6d408ba TM |
2560 | continue; |
2561 | if (status < 0) | |
2562 | goto out_error; | |
df817ba3 | 2563 | nfs4_state_end_reclaim_reboot(clp); |
02860014 TM |
2564 | } |
2565 | ||
45870d69 TM |
2566 | /* Detect expired delegations... */ |
2567 | if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) { | |
2568 | section = "detect expired delegations"; | |
2569 | nfs_reap_expired_delegations(clp); | |
2570 | continue; | |
2571 | } | |
2572 | ||
b79a4a1b TM |
2573 | /* Now recover expired state... */ |
2574 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2575 | section = "reclaim nograce"; |
591d71cb | 2576 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2577 | clp->cl_mvops->nograce_recovery_ops); |
df817ba3 | 2578 | if (status == -EAGAIN) |
b6d408ba TM |
2579 | continue; |
2580 | if (status < 0) | |
b79a4a1b | 2581 | goto out_error; |
1da177e4 | 2582 | } |
707fb4b3 | 2583 | |
5601a00d | 2584 | nfs4_end_drain_session(clp); |
aeabb3c9 TM |
2585 | nfs4_clear_state_manager_bit(clp); |
2586 | ||
2587 | if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) { | |
2588 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
2589 | nfs_client_return_marked_delegations(clp); | |
2590 | set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); | |
2591 | } | |
2592 | clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state); | |
707fb4b3 | 2593 | } |
e005e804 | 2594 | |
f3c76491 | 2595 | /* Did we race with an attempt to give us more work? */ |
aeabb3c9 | 2596 | if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state)) |
21a446cf | 2597 | return; |
f3c76491 | 2598 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
21a446cf | 2599 | return; |
a1aa09be | 2600 | } while (refcount_read(&clp->cl_count) > 1 && !signalled()); |
21a446cf TM |
2601 | goto out_drain; |
2602 | ||
1da177e4 | 2603 | out_error: |
8ed27d4f WAA |
2604 | if (strlen(section)) |
2605 | section_sep = ": "; | |
2606 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2607 | " with error %d\n", section_sep, section, | |
2608 | clp->cl_hostname, -status); | |
ffe5a830 | 2609 | ssleep(1); |
21a446cf | 2610 | out_drain: |
5601a00d | 2611 | nfs4_end_drain_session(clp); |
e005e804 TM |
2612 | nfs4_clear_state_manager_bit(clp); |
2613 | } | |
2614 | ||
2615 | static int nfs4_run_state_manager(void *ptr) | |
2616 | { | |
2617 | struct nfs_client *clp = ptr; | |
2618 | ||
2619 | allow_signal(SIGKILL); | |
2620 | nfs4_state_manager(clp); | |
2621 | nfs_put_client(clp); | |
2622 | module_put_and_exit(0); | |
2623 | return 0; | |
1da177e4 LT |
2624 | } |
2625 | ||
2626 | /* | |
2627 | * Local variables: | |
2628 | * c-basic-offset: 8 | |
2629 | * End: | |
2630 | */ |