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); | |
f02f3755 Z |
162 | |
163 | /* If the client state need to recover, do it. */ | |
164 | if (clp->cl_state) | |
165 | nfs4_schedule_state_manager(clp); | |
05f4c350 | 166 | } |
05f4c350 CL |
167 | out: |
168 | return status; | |
169 | } | |
170 | ||
a52458b4 | 171 | const struct cred *nfs4_get_machine_cred(struct nfs_client *clp) |
a2b2bb88 | 172 | { |
a52458b4 | 173 | return get_cred(rpc_machine_cred()); |
a2b2bb88 TM |
174 | } |
175 | ||
d688f7b8 CL |
176 | static void nfs4_root_machine_cred(struct nfs_client *clp) |
177 | { | |
d688f7b8 | 178 | |
5e16923b N |
179 | /* Force root creds instead of machine */ |
180 | clp->cl_principal = NULL; | |
181 | clp->cl_rpcclient->cl_principal = NULL; | |
d688f7b8 CL |
182 | } |
183 | ||
a52458b4 | 184 | static const struct cred * |
24d292b8 | 185 | nfs4_get_renew_cred_server_locked(struct nfs_server *server) |
b4454fe1 | 186 | { |
a52458b4 | 187 | const struct cred *cred = NULL; |
b4454fe1 | 188 | struct nfs4_state_owner *sp; |
9f958ab8 | 189 | struct rb_node *pos; |
b4454fe1 | 190 | |
24d292b8 CL |
191 | for (pos = rb_first(&server->state_owners); |
192 | pos != NULL; | |
193 | pos = rb_next(pos)) { | |
194 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b4454fe1 TM |
195 | if (list_empty(&sp->so_states)) |
196 | continue; | |
a52458b4 | 197 | cred = get_cred(sp->so_cred); |
b4454fe1 TM |
198 | break; |
199 | } | |
200 | return cred; | |
201 | } | |
202 | ||
24d292b8 | 203 | /** |
f15e1e8b | 204 | * nfs4_get_renew_cred - Acquire credential for a renew operation |
24d292b8 CL |
205 | * @clp: client state handle |
206 | * | |
207 | * Returns an rpc_cred with reference count bumped, or NULL. | |
208 | * Caller must hold clp->cl_lock. | |
209 | */ | |
a52458b4 | 210 | const struct cred *nfs4_get_renew_cred(struct nfs_client *clp) |
24d292b8 | 211 | { |
a52458b4 | 212 | const struct cred *cred = NULL; |
24d292b8 CL |
213 | struct nfs_server *server; |
214 | ||
e49a29bd | 215 | /* Use machine credentials if available */ |
f15e1e8b | 216 | cred = nfs4_get_machine_cred(clp); |
e49a29bd SP |
217 | if (cred != NULL) |
218 | goto out; | |
219 | ||
f15e1e8b | 220 | spin_lock(&clp->cl_lock); |
24d292b8 CL |
221 | rcu_read_lock(); |
222 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
223 | cred = nfs4_get_renew_cred_server_locked(server); | |
224 | if (cred != NULL) | |
225 | break; | |
226 | } | |
227 | rcu_read_unlock(); | |
f15e1e8b | 228 | spin_unlock(&clp->cl_lock); |
e49a29bd SP |
229 | |
230 | out: | |
24d292b8 CL |
231 | return cred; |
232 | } | |
233 | ||
62f288a0 | 234 | static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl) |
9dfdf404 | 235 | { |
774d5f14 | 236 | if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
961a828d | 237 | spin_lock(&tbl->slot_tbl_lock); |
b75ad4cd | 238 | nfs41_wake_slot_table(tbl); |
961a828d | 239 | spin_unlock(&tbl->slot_tbl_lock); |
689cf5c1 | 240 | } |
9dfdf404 RL |
241 | } |
242 | ||
62f288a0 AA |
243 | static void nfs4_end_drain_session(struct nfs_client *clp) |
244 | { | |
245 | struct nfs4_session *ses = clp->cl_session; | |
246 | ||
2cf8bca8 CL |
247 | if (clp->cl_slot_tbl) { |
248 | nfs4_end_drain_slot_table(clp->cl_slot_tbl); | |
249 | return; | |
250 | } | |
251 | ||
62f288a0 AA |
252 | if (ses != NULL) { |
253 | nfs4_end_drain_slot_table(&ses->bc_slot_table); | |
254 | nfs4_end_drain_slot_table(&ses->fc_slot_table); | |
255 | } | |
256 | } | |
257 | ||
774d5f14 | 258 | static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
9dfdf404 | 259 | { |
774d5f14 | 260 | set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
9dfdf404 | 261 | spin_lock(&tbl->slot_tbl_lock); |
b6bf6e7d | 262 | if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
16735d02 | 263 | reinit_completion(&tbl->complete); |
9dfdf404 | 264 | spin_unlock(&tbl->slot_tbl_lock); |
42acd021 | 265 | return wait_for_completion_interruptible(&tbl->complete); |
9dfdf404 RL |
266 | } |
267 | spin_unlock(&tbl->slot_tbl_lock); | |
268 | return 0; | |
269 | } | |
270 | ||
42acd021 AA |
271 | static int nfs4_begin_drain_session(struct nfs_client *clp) |
272 | { | |
273 | struct nfs4_session *ses = clp->cl_session; | |
8aafd2fd | 274 | int ret; |
42acd021 | 275 | |
2cf8bca8 CL |
276 | if (clp->cl_slot_tbl) |
277 | return nfs4_drain_slot_tbl(clp->cl_slot_tbl); | |
278 | ||
42acd021 | 279 | /* back channel */ |
774d5f14 | 280 | ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
42acd021 AA |
281 | if (ret) |
282 | return ret; | |
283 | /* fore channel */ | |
774d5f14 | 284 | return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
42acd021 AA |
285 | } |
286 | ||
c9fdeb28 CL |
287 | #if defined(CONFIG_NFS_V4_1) |
288 | ||
2cf8bca8 CL |
289 | static int nfs41_setup_state_renewal(struct nfs_client *clp) |
290 | { | |
291 | int status; | |
292 | struct nfs_fsinfo fsinfo; | |
fb10fb67 | 293 | unsigned long now; |
2cf8bca8 CL |
294 | |
295 | if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { | |
296 | nfs4_schedule_state_renewal(clp); | |
297 | return 0; | |
298 | } | |
299 | ||
fb10fb67 | 300 | now = jiffies; |
2cf8bca8 CL |
301 | status = nfs4_proc_get_lease_time(clp, &fsinfo); |
302 | if (status == 0) { | |
fb10fb67 | 303 | nfs4_set_lease_period(clp, fsinfo.lease_time * HZ, now); |
2cf8bca8 CL |
304 | nfs4_schedule_state_renewal(clp); |
305 | } | |
306 | ||
307 | return status; | |
308 | } | |
309 | ||
bda197f5 TM |
310 | static void nfs41_finish_session_reset(struct nfs_client *clp) |
311 | { | |
312 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
313 | clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
314 | /* create_session negotiated new slot table */ | |
bda197f5 TM |
315 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
316 | nfs41_setup_state_renewal(clp); | |
317 | } | |
318 | ||
a52458b4 | 319 | int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred) |
4d643d1d AA |
320 | { |
321 | int status; | |
322 | ||
fd954ae1 TM |
323 | if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
324 | goto do_confirm; | |
4d643d1d | 325 | status = nfs4_proc_exchange_id(clp, cred); |
9430fb6b RL |
326 | if (status != 0) |
327 | goto out; | |
fd954ae1 TM |
328 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
329 | do_confirm: | |
848f5bda | 330 | status = nfs4_proc_create_session(clp, cred); |
9430fb6b RL |
331 | if (status != 0) |
332 | goto out; | |
bda197f5 | 333 | nfs41_finish_session_reset(clp); |
9430fb6b RL |
334 | nfs_mark_client_ready(clp, NFS_CS_READY); |
335 | out: | |
4d643d1d AA |
336 | return status; |
337 | } | |
338 | ||
05f4c350 CL |
339 | /** |
340 | * nfs41_discover_server_trunking - Detect server IP address trunking (mv1) | |
341 | * | |
342 | * @clp: nfs_client under test | |
343 | * @result: OUT: found nfs_client, or clp | |
344 | * @cred: credential to use for trunking test | |
345 | * | |
346 | * Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. | |
347 | * If NFS4_OK is returned, an nfs_client pointer is planted in | |
348 | * "result". | |
349 | * | |
350 | * Note: The returned client may not yet be marked ready. | |
351 | */ | |
352 | int nfs41_discover_server_trunking(struct nfs_client *clp, | |
353 | struct nfs_client **result, | |
a52458b4 | 354 | const struct cred *cred) |
05f4c350 CL |
355 | { |
356 | int status; | |
357 | ||
358 | status = nfs4_proc_exchange_id(clp, cred); | |
359 | if (status != NFS4_OK) | |
360 | return status; | |
361 | ||
48d66b97 TM |
362 | status = nfs41_walk_client_list(clp, result, cred); |
363 | if (status < 0) | |
364 | return status; | |
365 | if (clp != *result) | |
366 | return 0; | |
367 | ||
8dcbec6d CL |
368 | /* |
369 | * Purge state if the client id was established in a prior | |
370 | * instance and the client id could not have arrived on the | |
371 | * server via Transparent State Migration. | |
372 | */ | |
373 | if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) { | |
374 | if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags)) | |
375 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); | |
376 | else | |
377 | set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
378 | } | |
48d66b97 TM |
379 | nfs4_schedule_state_manager(clp); |
380 | status = nfs_wait_client_init_complete(clp); | |
381 | if (status < 0) | |
382 | nfs_put_client(clp); | |
383 | return status; | |
05f4c350 CL |
384 | } |
385 | ||
b4b82607 AA |
386 | #endif /* CONFIG_NFS_V4_1 */ |
387 | ||
24d292b8 | 388 | /** |
73d8bde5 | 389 | * nfs4_get_clid_cred - Acquire credential for a setclientid operation |
24d292b8 CL |
390 | * @clp: client state handle |
391 | * | |
a52458b4 | 392 | * Returns a cred with reference count bumped, or NULL. |
24d292b8 | 393 | */ |
a52458b4 | 394 | const struct cred *nfs4_get_clid_cred(struct nfs_client *clp) |
24d292b8 | 395 | { |
a52458b4 | 396 | const struct cred *cred; |
286d7d6a | 397 | |
f15e1e8b | 398 | cred = nfs4_get_machine_cred(clp); |
a2b2bb88 | 399 | return cred; |
286d7d6a TM |
400 | } |
401 | ||
1da177e4 | 402 | static struct nfs4_state_owner * |
a52458b4 | 403 | nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred) |
1da177e4 | 404 | { |
24d292b8 | 405 | struct rb_node **p = &server->state_owners.rb_node, |
9f958ab8 | 406 | *parent = NULL; |
414adf14 | 407 | struct nfs4_state_owner *sp; |
a52458b4 | 408 | int cmp; |
1da177e4 | 409 | |
9f958ab8 TM |
410 | while (*p != NULL) { |
411 | parent = *p; | |
24d292b8 | 412 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
a52458b4 | 413 | cmp = cred_fscmp(cred, sp->so_cred); |
9f958ab8 | 414 | |
a52458b4 | 415 | if (cmp < 0) |
9f958ab8 | 416 | p = &parent->rb_left; |
a52458b4 | 417 | else if (cmp > 0) |
9f958ab8 TM |
418 | p = &parent->rb_right; |
419 | else { | |
0aaaf5c4 CL |
420 | if (!list_empty(&sp->so_lru)) |
421 | list_del_init(&sp->so_lru); | |
9f958ab8 | 422 | atomic_inc(&sp->so_count); |
414adf14 | 423 | return sp; |
9f958ab8 | 424 | } |
1da177e4 | 425 | } |
414adf14 | 426 | return NULL; |
1da177e4 LT |
427 | } |
428 | ||
9f958ab8 | 429 | static struct nfs4_state_owner * |
24d292b8 | 430 | nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
9f958ab8 | 431 | { |
24d292b8 CL |
432 | struct nfs_server *server = new->so_server; |
433 | struct rb_node **p = &server->state_owners.rb_node, | |
9f958ab8 TM |
434 | *parent = NULL; |
435 | struct nfs4_state_owner *sp; | |
a52458b4 | 436 | int cmp; |
9f958ab8 TM |
437 | |
438 | while (*p != NULL) { | |
439 | parent = *p; | |
24d292b8 | 440 | sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
a52458b4 | 441 | cmp = cred_fscmp(new->so_cred, sp->so_cred); |
9f958ab8 | 442 | |
a52458b4 | 443 | if (cmp < 0) |
9f958ab8 | 444 | p = &parent->rb_left; |
a52458b4 | 445 | else if (cmp > 0) |
9f958ab8 TM |
446 | p = &parent->rb_right; |
447 | else { | |
0aaaf5c4 CL |
448 | if (!list_empty(&sp->so_lru)) |
449 | list_del_init(&sp->so_lru); | |
9f958ab8 TM |
450 | atomic_inc(&sp->so_count); |
451 | return sp; | |
452 | } | |
453 | } | |
24d292b8 CL |
454 | rb_link_node(&new->so_server_node, parent, p); |
455 | rb_insert_color(&new->so_server_node, &server->state_owners); | |
9f958ab8 TM |
456 | return new; |
457 | } | |
458 | ||
459 | static void | |
24d292b8 | 460 | nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
9f958ab8 | 461 | { |
24d292b8 CL |
462 | struct nfs_server *server = sp->so_server; |
463 | ||
464 | if (!RB_EMPTY_NODE(&sp->so_server_node)) | |
465 | rb_erase(&sp->so_server_node, &server->state_owners); | |
9f958ab8 TM |
466 | } |
467 | ||
7ba127ab TM |
468 | static void |
469 | nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) | |
470 | { | |
95b72eb0 | 471 | sc->create_time = ktime_get(); |
7ba127ab TM |
472 | sc->flags = 0; |
473 | sc->counter = 0; | |
474 | spin_lock_init(&sc->lock); | |
475 | INIT_LIST_HEAD(&sc->list); | |
476 | rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); | |
477 | } | |
478 | ||
479 | static void | |
480 | nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) | |
481 | { | |
482 | rpc_destroy_wait_queue(&sc->wait); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /* |
486 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to | |
487 | * create a new state_owner. | |
488 | * | |
489 | */ | |
490 | static struct nfs4_state_owner * | |
d1e284d5 | 491 | nfs4_alloc_state_owner(struct nfs_server *server, |
a52458b4 | 492 | const struct cred *cred, |
d1e284d5 | 493 | gfp_t gfp_flags) |
1da177e4 LT |
494 | { |
495 | struct nfs4_state_owner *sp; | |
496 | ||
d1e284d5 | 497 | sp = kzalloc(sizeof(*sp), gfp_flags); |
1da177e4 LT |
498 | if (!sp) |
499 | return NULL; | |
aae5730e MW |
500 | sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0, |
501 | gfp_flags); | |
502 | if (sp->so_seqid.owner_id < 0) { | |
503 | kfree(sp); | |
504 | return NULL; | |
505 | } | |
d1e284d5 | 506 | sp->so_server = server; |
a52458b4 | 507 | sp->so_cred = get_cred(cred); |
ec073428 | 508 | spin_lock_init(&sp->so_lock); |
1da177e4 | 509 | INIT_LIST_HEAD(&sp->so_states); |
7ba127ab | 510 | nfs4_init_seqid_counter(&sp->so_seqid); |
1da177e4 | 511 | atomic_set(&sp->so_count, 1); |
0aaaf5c4 | 512 | INIT_LIST_HEAD(&sp->so_lru); |
c137afab | 513 | seqcount_init(&sp->so_reclaim_seqcount); |
65b62a29 | 514 | mutex_init(&sp->so_delegreturn_mutex); |
1da177e4 LT |
515 | return sp; |
516 | } | |
517 | ||
1d2e88e7 | 518 | static void |
86cfb041 | 519 | nfs4_reset_state_owner(struct nfs4_state_owner *sp) |
1da177e4 | 520 | { |
86cfb041 N |
521 | /* This state_owner is no longer usable, but must |
522 | * remain in place so that state recovery can find it | |
523 | * and the opens associated with it. | |
524 | * It may also be used for new 'open' request to | |
525 | * return a delegation to the server. | |
526 | * So update the 'create_time' so that it looks like | |
527 | * a new state_owner. This will cause the server to | |
528 | * request an OPEN_CONFIRM to start a new sequence. | |
529 | */ | |
530 | sp->so_seqid.create_time = ktime_get(); | |
1da177e4 LT |
531 | } |
532 | ||
0aaaf5c4 CL |
533 | static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
534 | { | |
7ba127ab | 535 | nfs4_destroy_seqid_counter(&sp->so_seqid); |
a52458b4 | 536 | put_cred(sp->so_cred); |
aae5730e | 537 | ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id); |
0aaaf5c4 CL |
538 | kfree(sp); |
539 | } | |
540 | ||
541 | static void nfs4_gc_state_owners(struct nfs_server *server) | |
542 | { | |
543 | struct nfs_client *clp = server->nfs_client; | |
544 | struct nfs4_state_owner *sp, *tmp; | |
545 | unsigned long time_min, time_max; | |
546 | LIST_HEAD(doomed); | |
547 | ||
548 | spin_lock(&clp->cl_lock); | |
549 | time_max = jiffies; | |
550 | time_min = (long)time_max - (long)clp->cl_lease_time; | |
551 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
552 | /* NB: LRU is sorted so that oldest is at the head */ | |
553 | if (time_in_range(sp->so_expires, time_min, time_max)) | |
554 | break; | |
555 | list_move(&sp->so_lru, &doomed); | |
556 | nfs4_remove_state_owner_locked(sp); | |
557 | } | |
558 | spin_unlock(&clp->cl_lock); | |
559 | ||
560 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
561 | list_del(&sp->so_lru); | |
562 | nfs4_free_state_owner(sp); | |
563 | } | |
564 | } | |
565 | ||
24d292b8 CL |
566 | /** |
567 | * nfs4_get_state_owner - Look up a state owner given a credential | |
568 | * @server: nfs_server to search | |
569 | * @cred: RPC credential to match | |
302fad7b | 570 | * @gfp_flags: allocation mode |
24d292b8 CL |
571 | * |
572 | * Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. | |
573 | */ | |
574 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, | |
a52458b4 | 575 | const struct cred *cred, |
d1e284d5 | 576 | gfp_t gfp_flags) |
1da177e4 | 577 | { |
7539bbab | 578 | struct nfs_client *clp = server->nfs_client; |
1da177e4 LT |
579 | struct nfs4_state_owner *sp, *new; |
580 | ||
1da177e4 | 581 | spin_lock(&clp->cl_lock); |
24d292b8 | 582 | sp = nfs4_find_state_owner_locked(server, cred); |
1da177e4 | 583 | spin_unlock(&clp->cl_lock); |
1da177e4 | 584 | if (sp != NULL) |
0aaaf5c4 | 585 | goto out; |
d1e284d5 | 586 | new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
9f958ab8 | 587 | if (new == NULL) |
0aaaf5c4 | 588 | goto out; |
aae5730e MW |
589 | spin_lock(&clp->cl_lock); |
590 | sp = nfs4_insert_state_owner_locked(new); | |
591 | spin_unlock(&clp->cl_lock); | |
d1e284d5 TM |
592 | if (sp != new) |
593 | nfs4_free_state_owner(new); | |
0aaaf5c4 CL |
594 | out: |
595 | nfs4_gc_state_owners(server); | |
9f958ab8 | 596 | return sp; |
1da177e4 LT |
597 | } |
598 | ||
24d292b8 CL |
599 | /** |
600 | * nfs4_put_state_owner - Release a nfs4_state_owner | |
601 | * @sp: state owner data to release | |
7bf97bc2 TM |
602 | * |
603 | * Note that we keep released state owners on an LRU | |
604 | * list. | |
605 | * This caches valid state owners so that they can be | |
606 | * reused, to avoid the OPEN_CONFIRM on minor version 0. | |
607 | * It also pins the uniquifier of dropped state owners for | |
608 | * a while, to ensure that those state owner names are | |
609 | * never reused. | |
24d292b8 | 610 | */ |
1da177e4 LT |
611 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
612 | { | |
0aaaf5c4 CL |
613 | struct nfs_server *server = sp->so_server; |
614 | struct nfs_client *clp = server->nfs_client; | |
1da177e4 LT |
615 | |
616 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) | |
617 | return; | |
0aaaf5c4 | 618 | |
7bf97bc2 TM |
619 | sp->so_expires = jiffies; |
620 | list_add_tail(&sp->so_lru, &server->state_owners_lru); | |
621 | spin_unlock(&clp->cl_lock); | |
0aaaf5c4 CL |
622 | } |
623 | ||
624 | /** | |
625 | * nfs4_purge_state_owners - Release all cached state owners | |
626 | * @server: nfs_server with cached state owners to release | |
627 | * | |
628 | * Called at umount time. Remaining state owners will be on | |
629 | * the LRU with ref count of zero. | |
630 | */ | |
631 | void nfs4_purge_state_owners(struct nfs_server *server) | |
632 | { | |
633 | struct nfs_client *clp = server->nfs_client; | |
634 | struct nfs4_state_owner *sp, *tmp; | |
635 | LIST_HEAD(doomed); | |
636 | ||
637 | spin_lock(&clp->cl_lock); | |
638 | list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { | |
639 | list_move(&sp->so_lru, &doomed); | |
640 | nfs4_remove_state_owner_locked(sp); | |
641 | } | |
1da177e4 | 642 | spin_unlock(&clp->cl_lock); |
0aaaf5c4 CL |
643 | |
644 | list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { | |
645 | list_del(&sp->so_lru); | |
646 | nfs4_free_state_owner(sp); | |
647 | } | |
1da177e4 LT |
648 | } |
649 | ||
650 | static struct nfs4_state * | |
651 | nfs4_alloc_open_state(void) | |
652 | { | |
653 | struct nfs4_state *state; | |
654 | ||
8535b2be | 655 | state = kzalloc(sizeof(*state), GFP_NOFS); |
1da177e4 LT |
656 | if (!state) |
657 | return NULL; | |
ace9fad4 | 658 | refcount_set(&state->count, 1); |
1da177e4 | 659 | INIT_LIST_HEAD(&state->lock_states); |
8d0a8a9d | 660 | spin_lock_init(&state->state_lock); |
8bda4e4c | 661 | seqlock_init(&state->seqlock); |
c9399f21 | 662 | init_waitqueue_head(&state->waitq); |
1da177e4 LT |
663 | return state; |
664 | } | |
665 | ||
4cecb76f | 666 | void |
dc0b027d | 667 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
4cecb76f | 668 | { |
dc0b027d | 669 | if (state->state == fmode) |
4cecb76f TM |
670 | return; |
671 | /* NB! List reordering - see the reclaim code for why. */ | |
dc0b027d TM |
672 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
673 | if (fmode & FMODE_WRITE) | |
4cecb76f TM |
674 | list_move(&state->open_states, &state->owner->so_states); |
675 | else | |
676 | list_move_tail(&state->open_states, &state->owner->so_states); | |
677 | } | |
dc0b027d | 678 | state->state = fmode; |
4cecb76f TM |
679 | } |
680 | ||
1da177e4 LT |
681 | static struct nfs4_state * |
682 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) | |
683 | { | |
684 | struct nfs_inode *nfsi = NFS_I(inode); | |
685 | struct nfs4_state *state; | |
686 | ||
9ae075fd | 687 | list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) { |
1c816efa | 688 | if (state->owner != owner) |
1da177e4 | 689 | continue; |
5d422301 TM |
690 | if (!nfs4_valid_open_stateid(state)) |
691 | continue; | |
ace9fad4 | 692 | if (refcount_inc_not_zero(&state->count)) |
1da177e4 | 693 | return state; |
1da177e4 LT |
694 | } |
695 | return NULL; | |
696 | } | |
697 | ||
1da177e4 LT |
698 | static void |
699 | nfs4_free_open_state(struct nfs4_state *state) | |
700 | { | |
9ae075fd | 701 | kfree_rcu(state, rcu_head); |
1da177e4 LT |
702 | } |
703 | ||
704 | struct nfs4_state * | |
705 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) | |
706 | { | |
707 | struct nfs4_state *state, *new; | |
708 | struct nfs_inode *nfsi = NFS_I(inode); | |
709 | ||
9ae075fd | 710 | rcu_read_lock(); |
1da177e4 | 711 | state = __nfs4_find_state_byowner(inode, owner); |
9ae075fd | 712 | rcu_read_unlock(); |
1da177e4 LT |
713 | if (state) |
714 | goto out; | |
715 | new = nfs4_alloc_open_state(); | |
ec073428 | 716 | spin_lock(&owner->so_lock); |
1da177e4 LT |
717 | spin_lock(&inode->i_lock); |
718 | state = __nfs4_find_state_byowner(inode, owner); | |
719 | if (state == NULL && new != NULL) { | |
720 | state = new; | |
1da177e4 LT |
721 | state->owner = owner; |
722 | atomic_inc(&owner->so_count); | |
9ae075fd | 723 | list_add_rcu(&state->inode_states, &nfsi->open_states); |
0444d76a DC |
724 | ihold(inode); |
725 | state->inode = inode; | |
1da177e4 | 726 | spin_unlock(&inode->i_lock); |
ec073428 TM |
727 | /* Note: The reclaim code dictates that we add stateless |
728 | * and read-only stateids to the end of the list */ | |
729 | list_add_tail(&state->open_states, &owner->so_states); | |
730 | spin_unlock(&owner->so_lock); | |
1da177e4 LT |
731 | } else { |
732 | spin_unlock(&inode->i_lock); | |
ec073428 | 733 | spin_unlock(&owner->so_lock); |
1da177e4 LT |
734 | if (new) |
735 | nfs4_free_open_state(new); | |
736 | } | |
737 | out: | |
738 | return state; | |
739 | } | |
740 | ||
1da177e4 LT |
741 | void nfs4_put_open_state(struct nfs4_state *state) |
742 | { | |
743 | struct inode *inode = state->inode; | |
744 | struct nfs4_state_owner *owner = state->owner; | |
745 | ||
ace9fad4 | 746 | if (!refcount_dec_and_lock(&state->count, &owner->so_lock)) |
1da177e4 | 747 | return; |
ec073428 | 748 | spin_lock(&inode->i_lock); |
9ae075fd | 749 | list_del_rcu(&state->inode_states); |
1da177e4 | 750 | list_del(&state->open_states); |
ec073428 TM |
751 | spin_unlock(&inode->i_lock); |
752 | spin_unlock(&owner->so_lock); | |
1da177e4 | 753 | iput(inode); |
1da177e4 LT |
754 | nfs4_free_open_state(state); |
755 | nfs4_put_state_owner(owner); | |
756 | } | |
757 | ||
758 | /* | |
83c9d41e | 759 | * Close the current file. |
1da177e4 | 760 | */ |
643168c2 | 761 | static void __nfs4_close(struct nfs4_state *state, |
8535b2be | 762 | fmode_t fmode, gfp_t gfp_mask, int wait) |
1da177e4 | 763 | { |
1da177e4 | 764 | struct nfs4_state_owner *owner = state->owner; |
003707c7 | 765 | int call_close = 0; |
dc0b027d | 766 | fmode_t newstate; |
1da177e4 LT |
767 | |
768 | atomic_inc(&owner->so_count); | |
1da177e4 | 769 | /* Protect against nfs4_find_state() */ |
ec073428 | 770 | spin_lock(&owner->so_lock); |
dc0b027d | 771 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
e7616923 TM |
772 | case FMODE_READ: |
773 | state->n_rdonly--; | |
774 | break; | |
775 | case FMODE_WRITE: | |
776 | state->n_wronly--; | |
777 | break; | |
778 | case FMODE_READ|FMODE_WRITE: | |
779 | state->n_rdwr--; | |
780 | } | |
003707c7 | 781 | newstate = FMODE_READ|FMODE_WRITE; |
e7616923 | 782 | if (state->n_rdwr == 0) { |
003707c7 | 783 | if (state->n_rdonly == 0) { |
e7616923 | 784 | newstate &= ~FMODE_READ; |
003707c7 TM |
785 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
786 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
787 | } | |
788 | if (state->n_wronly == 0) { | |
e7616923 | 789 | newstate &= ~FMODE_WRITE; |
003707c7 TM |
790 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
791 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); | |
792 | } | |
793 | if (newstate == 0) | |
794 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
e7616923 | 795 | } |
003707c7 | 796 | nfs4_state_set_mode_locked(state, newstate); |
ec073428 | 797 | spin_unlock(&owner->so_lock); |
4cecb76f | 798 | |
003707c7 | 799 | if (!call_close) { |
b39e625b TM |
800 | nfs4_put_open_state(state); |
801 | nfs4_put_state_owner(owner); | |
1f7977c1 TM |
802 | } else |
803 | nfs4_do_close(state, gfp_mask, wait); | |
a49c3c77 TM |
804 | } |
805 | ||
643168c2 | 806 | void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 807 | { |
643168c2 | 808 | __nfs4_close(state, fmode, GFP_NOFS, 0); |
a49c3c77 TM |
809 | } |
810 | ||
643168c2 | 811 | void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
a49c3c77 | 812 | { |
643168c2 | 813 | __nfs4_close(state, fmode, GFP_KERNEL, 1); |
1da177e4 LT |
814 | } |
815 | ||
816 | /* | |
817 | * Search the state->lock_states for an existing lock_owner | |
3f8f2548 N |
818 | * that is compatible with either of the given owners. |
819 | * If the second is non-zero, then the first refers to a Posix-lock | |
820 | * owner (current->files) and the second refers to a flock/OFD | |
821 | * owner (struct file*). In that case, prefer a match for the first | |
822 | * owner. | |
823 | * If both sorts of locks are held on the one file we cannot know | |
824 | * which stateid was intended to be used, so a "correct" choice cannot | |
825 | * be made. Failing that, a "consistent" choice is preferable. The | |
826 | * consistent choice we make is to prefer the first owner, that of a | |
827 | * Posix lock. | |
1da177e4 LT |
828 | */ |
829 | static struct nfs4_lock_state * | |
8d424431 N |
830 | __nfs4_find_lock_state(struct nfs4_state *state, |
831 | fl_owner_t fl_owner, fl_owner_t fl_owner2) | |
1da177e4 | 832 | { |
3f8f2548 | 833 | struct nfs4_lock_state *pos, *ret = NULL; |
1da177e4 | 834 | list_for_each_entry(pos, &state->lock_states, ls_locks) { |
3f8f2548 N |
835 | if (pos->ls_owner == fl_owner) { |
836 | ret = pos; | |
837 | break; | |
838 | } | |
839 | if (pos->ls_owner == fl_owner2) | |
840 | ret = pos; | |
1da177e4 | 841 | } |
3f8f2548 | 842 | if (ret) |
194bc1f4 | 843 | refcount_inc(&ret->ls_count); |
3f8f2548 | 844 | return ret; |
1da177e4 LT |
845 | } |
846 | ||
1da177e4 LT |
847 | /* |
848 | * Return a compatible lock_state. If no initialized lock_state structure | |
849 | * exists, return an uninitialized one. | |
850 | * | |
1da177e4 | 851 | */ |
8003d3c4 | 852 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
1da177e4 LT |
853 | { |
854 | struct nfs4_lock_state *lsp; | |
24d292b8 | 855 | struct nfs_server *server = state->owner->so_server; |
1da177e4 | 856 | |
8535b2be | 857 | lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
1da177e4 LT |
858 | if (lsp == NULL) |
859 | return NULL; | |
7ba127ab | 860 | nfs4_init_seqid_counter(&lsp->ls_seqid); |
194bc1f4 | 861 | refcount_set(&lsp->ls_count, 1); |
b64aec8d | 862 | lsp->ls_state = state; |
8003d3c4 | 863 | lsp->ls_owner = fl_owner; |
48c22eb2 TM |
864 | lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
865 | if (lsp->ls_seqid.owner_id < 0) | |
d2d7ce28 | 866 | goto out_free; |
8d0a8a9d | 867 | INIT_LIST_HEAD(&lsp->ls_locks); |
1da177e4 | 868 | return lsp; |
d2d7ce28 TM |
869 | out_free: |
870 | kfree(lsp); | |
871 | return NULL; | |
1da177e4 LT |
872 | } |
873 | ||
5ae67c4f | 874 | void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
9f958ab8 | 875 | { |
48c22eb2 | 876 | ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
7ba127ab | 877 | nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
9f958ab8 TM |
878 | kfree(lsp); |
879 | } | |
880 | ||
1da177e4 LT |
881 | /* |
882 | * Return a compatible lock_state. If no initialized lock_state structure | |
883 | * exists, return an uninitialized one. | |
884 | * | |
1da177e4 | 885 | */ |
8003d3c4 | 886 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
1da177e4 | 887 | { |
8d0a8a9d | 888 | struct nfs4_lock_state *lsp, *new = NULL; |
1da177e4 | 889 | |
8d0a8a9d TM |
890 | for(;;) { |
891 | spin_lock(&state->state_lock); | |
68e33bd6 | 892 | lsp = __nfs4_find_lock_state(state, owner, NULL); |
8d0a8a9d TM |
893 | if (lsp != NULL) |
894 | break; | |
895 | if (new != NULL) { | |
8d0a8a9d TM |
896 | list_add(&new->ls_locks, &state->lock_states); |
897 | set_bit(LK_STATE_IN_USE, &state->flags); | |
898 | lsp = new; | |
899 | new = NULL; | |
900 | break; | |
901 | } | |
902 | spin_unlock(&state->state_lock); | |
8003d3c4 | 903 | new = nfs4_alloc_lock_state(state, owner); |
8d0a8a9d TM |
904 | if (new == NULL) |
905 | return NULL; | |
906 | } | |
907 | spin_unlock(&state->state_lock); | |
9f958ab8 | 908 | if (new != NULL) |
5ae67c4f | 909 | nfs4_free_lock_state(state->owner->so_server, new); |
1da177e4 LT |
910 | return lsp; |
911 | } | |
912 | ||
913 | /* | |
8d0a8a9d TM |
914 | * Release reference to lock_state, and free it if we see that |
915 | * it is no longer in use | |
1da177e4 | 916 | */ |
faf5f49c | 917 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
1da177e4 | 918 | { |
c8b2d0bf | 919 | struct nfs_server *server; |
8d0a8a9d | 920 | struct nfs4_state *state; |
1da177e4 | 921 | |
8d0a8a9d TM |
922 | if (lsp == NULL) |
923 | return; | |
924 | state = lsp->ls_state; | |
194bc1f4 | 925 | if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
8d0a8a9d TM |
926 | return; |
927 | list_del(&lsp->ls_locks); | |
928 | if (list_empty(&state->lock_states)) | |
929 | clear_bit(LK_STATE_IN_USE, &state->flags); | |
930 | spin_unlock(&state->state_lock); | |
0c0e0d3c JL |
931 | server = state->owner->so_server; |
932 | if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { | |
933 | struct nfs_client *clp = server->nfs_client; | |
934 | ||
935 | clp->cl_mvops->free_lock_state(server, lsp); | |
936 | } else | |
c8b2d0bf | 937 | nfs4_free_lock_state(server, lsp); |
1da177e4 LT |
938 | } |
939 | ||
8d0a8a9d | 940 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
1da177e4 | 941 | { |
8d0a8a9d | 942 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
1da177e4 | 943 | |
8d0a8a9d | 944 | dst->fl_u.nfs4_fl.owner = lsp; |
194bc1f4 | 945 | refcount_inc(&lsp->ls_count); |
8d0a8a9d | 946 | } |
1da177e4 | 947 | |
8d0a8a9d | 948 | static void nfs4_fl_release_lock(struct file_lock *fl) |
1da177e4 | 949 | { |
8d0a8a9d | 950 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
1da177e4 LT |
951 | } |
952 | ||
6aed6285 | 953 | static const struct file_lock_operations nfs4_fl_lock_ops = { |
8d0a8a9d TM |
954 | .fl_copy_lock = nfs4_fl_copy_lock, |
955 | .fl_release_private = nfs4_fl_release_lock, | |
956 | }; | |
957 | ||
958 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) | |
1da177e4 | 959 | { |
8d0a8a9d TM |
960 | struct nfs4_lock_state *lsp; |
961 | ||
962 | if (fl->fl_ops != NULL) | |
963 | return 0; | |
8003d3c4 | 964 | lsp = nfs4_get_lock_state(state, fl->fl_owner); |
8d0a8a9d TM |
965 | if (lsp == NULL) |
966 | return -ENOMEM; | |
967 | fl->fl_u.nfs4_fl.owner = lsp; | |
968 | fl->fl_ops = &nfs4_fl_lock_ops; | |
969 | return 0; | |
1da177e4 LT |
970 | } |
971 | ||
5521abfd TM |
972 | static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
973 | struct nfs4_state *state, | |
17393475 | 974 | const struct nfs_lock_context *l_ctx) |
1da177e4 | 975 | { |
8d0a8a9d | 976 | struct nfs4_lock_state *lsp; |
8d424431 | 977 | fl_owner_t fl_owner, fl_flock_owner; |
5521abfd | 978 | int ret = -ENOENT; |
1da177e4 | 979 | |
17393475 | 980 | if (l_ctx == NULL) |
2a369153 TM |
981 | goto out; |
982 | ||
8d0a8a9d | 983 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
4fc8796d | 984 | goto out; |
1da177e4 | 985 | |
d51fdb87 | 986 | fl_owner = l_ctx->lockowner; |
8d424431 N |
987 | fl_flock_owner = l_ctx->open_context->flock_owner; |
988 | ||
8d0a8a9d | 989 | spin_lock(&state->state_lock); |
8d424431 | 990 | lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner); |
ef1820f9 N |
991 | if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) |
992 | ret = -EIO; | |
993 | else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { | |
f597c537 | 994 | nfs4_stateid_copy(dst, &lsp->ls_stateid); |
5521abfd | 995 | ret = 0; |
4fc8796d | 996 | } |
8d0a8a9d | 997 | spin_unlock(&state->state_lock); |
1da177e4 | 998 | nfs4_put_lock_state(lsp); |
4fc8796d TM |
999 | out: |
1000 | return ret; | |
1001 | } | |
1002 | ||
12f275cd TM |
1003 | bool nfs4_refresh_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
1004 | { | |
1005 | bool ret; | |
1006 | int seq; | |
1007 | ||
1008 | do { | |
1009 | ret = false; | |
1010 | seq = read_seqbegin(&state->seqlock); | |
1011 | if (nfs4_state_match_open_stateid_other(state, dst)) { | |
1012 | dst->seqid = state->open_stateid.seqid; | |
1013 | ret = true; | |
1014 | } | |
1015 | } while (read_seqretry(&state->seqlock, seq)); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
c82bac6f | 1019 | bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
4fc8796d | 1020 | { |
c82bac6f | 1021 | bool ret; |
92b40e93 | 1022 | const nfs4_stateid *src; |
4fc8796d TM |
1023 | int seq; |
1024 | ||
1025 | do { | |
c82bac6f | 1026 | ret = false; |
92b40e93 | 1027 | src = &zero_stateid; |
4fc8796d | 1028 | seq = read_seqbegin(&state->seqlock); |
c82bac6f | 1029 | if (test_bit(NFS_OPEN_STATE, &state->flags)) { |
92b40e93 | 1030 | src = &state->open_stateid; |
c82bac6f TM |
1031 | ret = true; |
1032 | } | |
92b40e93 | 1033 | nfs4_stateid_copy(dst, src); |
4fc8796d | 1034 | } while (read_seqretry(&state->seqlock, seq)); |
c82bac6f | 1035 | return ret; |
4fc8796d TM |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * Byte-range lock aware utility to initialize the stateid of read/write | |
1040 | * requests. | |
1041 | */ | |
abf4e13c | 1042 | int nfs4_select_rw_stateid(struct nfs4_state *state, |
17393475 | 1043 | fmode_t fmode, const struct nfs_lock_context *l_ctx, |
a52458b4 | 1044 | nfs4_stateid *dst, const struct cred **cred) |
4fc8796d | 1045 | { |
abf4e13c TM |
1046 | int ret; |
1047 | ||
7ebeb7fe TM |
1048 | if (!nfs4_valid_open_stateid(state)) |
1049 | return -EIO; | |
abf4e13c TM |
1050 | if (cred != NULL) |
1051 | *cred = NULL; | |
17393475 | 1052 | ret = nfs4_copy_lock_stateid(dst, state, l_ctx); |
ef1820f9 N |
1053 | if (ret == -EIO) |
1054 | /* A lost lock - don't even consider delegations */ | |
1055 | goto out; | |
146d70ca | 1056 | /* returns true if delegation stateid found and copied */ |
abf4e13c | 1057 | if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) { |
146d70ca | 1058 | ret = 0; |
5521abfd | 1059 | goto out; |
146d70ca | 1060 | } |
5521abfd | 1061 | if (ret != -ENOENT) |
ef1820f9 N |
1062 | /* nfs4_copy_delegation_stateid() didn't over-write |
1063 | * dst, so it still has the lock stateid which we now | |
1064 | * choose to use. | |
1065 | */ | |
5521abfd | 1066 | goto out; |
927864cd TM |
1067 | nfs4_copy_open_stateid(dst, state); |
1068 | ret = 0; | |
5521abfd | 1069 | out: |
3b66486c TM |
1070 | if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
1071 | dst->seqid = 0; | |
5521abfd | 1072 | return ret; |
1da177e4 LT |
1073 | } |
1074 | ||
8535b2be | 1075 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
cee54fc9 | 1076 | { |
cee54fc9 TM |
1077 | struct nfs_seqid *new; |
1078 | ||
8535b2be | 1079 | new = kmalloc(sizeof(*new), gfp_mask); |
badc76dd TM |
1080 | if (new == NULL) |
1081 | return ERR_PTR(-ENOMEM); | |
1082 | new->sequence = counter; | |
1083 | INIT_LIST_HEAD(&new->list); | |
1084 | new->task = NULL; | |
cee54fc9 TM |
1085 | return new; |
1086 | } | |
1087 | ||
72211dbe | 1088 | void nfs_release_seqid(struct nfs_seqid *seqid) |
1da177e4 | 1089 | { |
4601df20 | 1090 | struct nfs_seqid_counter *sequence; |
cee54fc9 | 1091 | |
a6796419 | 1092 | if (seqid == NULL || list_empty(&seqid->list)) |
4601df20 TM |
1093 | return; |
1094 | sequence = seqid->sequence; | |
1095 | spin_lock(&sequence->lock); | |
1096 | list_del_init(&seqid->list); | |
1097 | if (!list_empty(&sequence->list)) { | |
1098 | struct nfs_seqid *next; | |
1099 | ||
1100 | next = list_first_entry(&sequence->list, | |
1101 | struct nfs_seqid, list); | |
1102 | rpc_wake_up_queued_task(&sequence->wait, next->task); | |
2f74c0a0 | 1103 | } |
4601df20 | 1104 | spin_unlock(&sequence->lock); |
72211dbe TM |
1105 | } |
1106 | ||
1107 | void nfs_free_seqid(struct nfs_seqid *seqid) | |
1108 | { | |
1109 | nfs_release_seqid(seqid); | |
cee54fc9 | 1110 | kfree(seqid); |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | /* | |
cee54fc9 TM |
1114 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
1115 | * failed with a seqid incrementing error - | |
16a6ddc7 | 1116 | * see comments nfs4.h:seqid_mutating_error() |
cee54fc9 | 1117 | */ |
88d90939 | 1118 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
cee54fc9 TM |
1119 | { |
1120 | switch (status) { | |
1121 | case 0: | |
1122 | break; | |
1123 | case -NFS4ERR_BAD_SEQID: | |
6f43ddcc TM |
1124 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
1125 | return; | |
9a3ba432 | 1126 | pr_warn_ratelimited("NFS: v4 server returned a bad" |
497799e7 DM |
1127 | " sequence-id error on an" |
1128 | " unconfirmed sequence %p!\n", | |
6f43ddcc | 1129 | seqid->sequence); |
cee54fc9 TM |
1130 | case -NFS4ERR_STALE_CLIENTID: |
1131 | case -NFS4ERR_STALE_STATEID: | |
1132 | case -NFS4ERR_BAD_STATEID: | |
1133 | case -NFS4ERR_BADXDR: | |
1134 | case -NFS4ERR_RESOURCE: | |
1135 | case -NFS4ERR_NOFILEHANDLE: | |
406dab84 | 1136 | case -NFS4ERR_MOVED: |
cee54fc9 TM |
1137 | /* Non-seqid mutating errors */ |
1138 | return; | |
1139 | }; | |
1140 | /* | |
1141 | * Note: no locking needed as we are guaranteed to be first | |
1142 | * on the sequence list | |
1143 | */ | |
1144 | seqid->sequence->counter++; | |
1145 | } | |
1146 | ||
1147 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) | |
1148 | { | |
a6796419 TM |
1149 | struct nfs4_state_owner *sp; |
1150 | ||
1151 | if (seqid == NULL) | |
1152 | return; | |
34dc1ad7 | 1153 | |
a6796419 | 1154 | sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid); |
34dc1ad7 | 1155 | if (status == -NFS4ERR_BAD_SEQID) |
86cfb041 | 1156 | nfs4_reset_state_owner(sp); |
a6796419 | 1157 | if (!nfs4_has_session(sp->so_server->nfs_client)) |
34dc1ad7 | 1158 | nfs_increment_seqid(status, seqid); |
cee54fc9 TM |
1159 | } |
1160 | ||
1161 | /* | |
cee54fc9 TM |
1162 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
1163 | * failed with a seqid incrementing error - | |
16a6ddc7 | 1164 | * see comments nfs4.h:seqid_mutating_error() |
cee54fc9 TM |
1165 | */ |
1166 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) | |
1167 | { | |
a6796419 TM |
1168 | if (seqid != NULL) |
1169 | nfs_increment_seqid(status, seqid); | |
cee54fc9 TM |
1170 | } |
1171 | ||
1172 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) | |
1173 | { | |
a6796419 | 1174 | struct nfs_seqid_counter *sequence; |
cee54fc9 TM |
1175 | int status = 0; |
1176 | ||
a6796419 TM |
1177 | if (seqid == NULL) |
1178 | goto out; | |
1179 | sequence = seqid->sequence; | |
cee54fc9 | 1180 | spin_lock(&sequence->lock); |
4601df20 | 1181 | seqid->task = task; |
2f74c0a0 TM |
1182 | if (list_empty(&seqid->list)) |
1183 | list_add_tail(&seqid->list, &sequence->list); | |
1184 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) | |
1185 | goto unlock; | |
5d00837b | 1186 | rpc_sleep_on(&sequence->wait, task, NULL); |
2f74c0a0 TM |
1187 | status = -EAGAIN; |
1188 | unlock: | |
cee54fc9 | 1189 | spin_unlock(&sequence->lock); |
a6796419 | 1190 | out: |
cee54fc9 | 1191 | return status; |
1da177e4 LT |
1192 | } |
1193 | ||
e005e804 | 1194 | static int nfs4_run_state_manager(void *); |
1da177e4 | 1195 | |
e005e804 | 1196 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
433fbe4c | 1197 | { |
4e857c58 | 1198 | smp_mb__before_atomic(); |
e005e804 | 1199 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
4e857c58 | 1200 | smp_mb__after_atomic(); |
e005e804 | 1201 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
433fbe4c TM |
1202 | rpc_wake_up(&clp->cl_rpcwaitq); |
1203 | } | |
1204 | ||
1da177e4 | 1205 | /* |
e005e804 | 1206 | * Schedule the nfs_client asynchronous state management routine |
1da177e4 | 1207 | */ |
b0d3ded1 | 1208 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
1da177e4 | 1209 | { |
5043e900 | 1210 | struct task_struct *task; |
2446ab60 | 1211 | char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
1da177e4 | 1212 | |
aeabb3c9 | 1213 | set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
e005e804 TM |
1214 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
1215 | return; | |
5043e900 | 1216 | __module_get(THIS_MODULE); |
212bf41d | 1217 | refcount_inc(&clp->cl_count); |
2446ab60 TM |
1218 | |
1219 | /* The rcu_read_lock() is not strictly necessary, as the state | |
1220 | * manager is the only thread that ever changes the rpc_xprt | |
1221 | * after it's initialized. At this point, we're single threaded. */ | |
1222 | rcu_read_lock(); | |
1223 | snprintf(buf, sizeof(buf), "%s-manager", | |
1224 | rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); | |
1225 | rcu_read_unlock(); | |
f170168b | 1226 | task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
2446ab60 TM |
1227 | if (IS_ERR(task)) { |
1228 | printk(KERN_ERR "%s: kthread_run: %ld\n", | |
1229 | __func__, PTR_ERR(task)); | |
1230 | nfs4_clear_state_manager_bit(clp); | |
1231 | nfs_put_client(clp); | |
1232 | module_put(THIS_MODULE); | |
1233 | } | |
1da177e4 LT |
1234 | } |
1235 | ||
1236 | /* | |
0400a6b0 | 1237 | * Schedule a lease recovery attempt |
1da177e4 | 1238 | */ |
0400a6b0 | 1239 | void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
1da177e4 LT |
1240 | { |
1241 | if (!clp) | |
1242 | return; | |
e598d843 TM |
1243 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
1244 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
cc0a9843 TM |
1245 | dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
1246 | clp->cl_hostname); | |
e005e804 | 1247 | nfs4_schedule_state_manager(clp); |
1da177e4 | 1248 | } |
9cb81968 | 1249 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
1da177e4 | 1250 | |
c9fdeb28 CL |
1251 | /** |
1252 | * nfs4_schedule_migration_recovery - trigger migration recovery | |
1253 | * | |
1254 | * @server: FSID that is migrating | |
1255 | * | |
1256 | * Returns zero if recovery has started, otherwise a negative NFS4ERR | |
1257 | * value is returned. | |
1258 | */ | |
1259 | int nfs4_schedule_migration_recovery(const struct nfs_server *server) | |
1260 | { | |
1261 | struct nfs_client *clp = server->nfs_client; | |
1262 | ||
1263 | if (server->fh_expire_type != NFS4_FH_PERSISTENT) { | |
1264 | pr_err("NFS: volatile file handles not supported (server %s)\n", | |
1265 | clp->cl_hostname); | |
1266 | return -NFS4ERR_IO; | |
1267 | } | |
1268 | ||
1269 | if (test_bit(NFS_MIG_FAILED, &server->mig_status)) | |
1270 | return -NFS4ERR_IO; | |
1271 | ||
1272 | dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n", | |
1273 | __func__, | |
1274 | (unsigned long long)server->fsid.major, | |
1275 | (unsigned long long)server->fsid.minor, | |
1276 | clp->cl_hostname); | |
1277 | ||
1278 | set_bit(NFS_MIG_IN_TRANSITION, | |
1279 | &((struct nfs_server *)server)->mig_status); | |
1280 | set_bit(NFS4CLNT_MOVED, &clp->cl_state); | |
1281 | ||
1282 | nfs4_schedule_state_manager(clp); | |
1283 | return 0; | |
1284 | } | |
1285 | EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery); | |
1286 | ||
b7f7a66e CL |
1287 | /** |
1288 | * nfs4_schedule_lease_moved_recovery - start lease-moved recovery | |
1289 | * | |
1290 | * @clp: server to check for moved leases | |
1291 | * | |
1292 | */ | |
1293 | void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp) | |
1294 | { | |
1295 | dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n", | |
1296 | __func__, clp->cl_clientid, clp->cl_hostname); | |
1297 | ||
1298 | set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state); | |
1299 | nfs4_schedule_state_manager(clp); | |
1300 | } | |
1301 | EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery); | |
1302 | ||
33021279 TM |
1303 | int nfs4_wait_clnt_recover(struct nfs_client *clp) |
1304 | { | |
1305 | int res; | |
1306 | ||
1307 | might_sleep(); | |
1308 | ||
212bf41d | 1309 | refcount_inc(&clp->cl_count); |
74316201 N |
1310 | res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, |
1311 | nfs_wait_bit_killable, TASK_KILLABLE); | |
33021279 | 1312 | if (res) |
0625c2dd | 1313 | goto out; |
33021279 | 1314 | if (clp->cl_cons_state < 0) |
0625c2dd CL |
1315 | res = clp->cl_cons_state; |
1316 | out: | |
1317 | nfs_put_client(clp); | |
1318 | return res; | |
33021279 TM |
1319 | } |
1320 | ||
1321 | int nfs4_client_recover_expired_lease(struct nfs_client *clp) | |
1322 | { | |
1323 | unsigned int loop; | |
1324 | int ret; | |
1325 | ||
1326 | for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { | |
1327 | ret = nfs4_wait_clnt_recover(clp); | |
1328 | if (ret != 0) | |
1329 | break; | |
1330 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && | |
1331 | !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) | |
1332 | break; | |
1333 | nfs4_schedule_state_manager(clp); | |
1334 | ret = -EIO; | |
1335 | } | |
1336 | return ret; | |
1337 | } | |
1338 | ||
ad1e3968 TM |
1339 | /* |
1340 | * nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN | |
1341 | * @clp: client to process | |
1342 | * | |
1343 | * Set the NFS4CLNT_LEASE_EXPIRED state in order to force a | |
1344 | * resend of the SETCLIENTID and hence re-establish the | |
1345 | * callback channel. Then return all existing delegations. | |
1346 | */ | |
1347 | static void nfs40_handle_cb_pathdown(struct nfs_client *clp) | |
1348 | { | |
1349 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1350 | nfs_expire_all_delegations(clp); | |
cc0a9843 TM |
1351 | dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
1352 | clp->cl_hostname); | |
ad1e3968 TM |
1353 | } |
1354 | ||
042b60be TM |
1355 | void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
1356 | { | |
ad1e3968 | 1357 | nfs40_handle_cb_pathdown(clp); |
042b60be TM |
1358 | nfs4_schedule_state_manager(clp); |
1359 | } | |
1360 | ||
f9feab1e | 1361 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b TM |
1362 | { |
1363 | ||
7ebeb7fe TM |
1364 | if (!nfs4_valid_open_stateid(state)) |
1365 | return 0; | |
b79a4a1b TM |
1366 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
1367 | /* Don't recover state that expired before the reboot */ | |
1368 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { | |
1369 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
1370 | return 0; | |
1371 | } | |
7eff03ae | 1372 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
b79a4a1b TM |
1373 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
1374 | return 1; | |
1375 | } | |
1376 | ||
4f14c194 | 1377 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
b79a4a1b | 1378 | { |
7ebeb7fe TM |
1379 | if (!nfs4_valid_open_stateid(state)) |
1380 | return 0; | |
b79a4a1b TM |
1381 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
1382 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); | |
7eff03ae | 1383 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
b79a4a1b TM |
1384 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
1385 | return 1; | |
1386 | } | |
1387 | ||
5d422301 | 1388 | int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
0400a6b0 TM |
1389 | { |
1390 | struct nfs_client *clp = server->nfs_client; | |
1391 | ||
7ebeb7fe | 1392 | if (!nfs4_state_mark_reclaim_nograce(clp, state)) |
5d422301 | 1393 | return -EBADF; |
994b15b9 TM |
1394 | nfs_inode_find_delegation_state_and_recover(state->inode, |
1395 | &state->stateid); | |
cc0a9843 TM |
1396 | dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
1397 | clp->cl_hostname); | |
0400a6b0 | 1398 | nfs4_schedule_state_manager(clp); |
5d422301 | 1399 | return 0; |
0400a6b0 | 1400 | } |
9cb81968 | 1401 | EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
0400a6b0 | 1402 | |
6c2d8f8d TM |
1403 | static struct nfs4_lock_state * |
1404 | nfs_state_find_lock_state_by_stateid(struct nfs4_state *state, | |
1405 | const nfs4_stateid *stateid) | |
1406 | { | |
1407 | struct nfs4_lock_state *pos; | |
1408 | ||
1409 | list_for_each_entry(pos, &state->lock_states, ls_locks) { | |
1410 | if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags)) | |
1411 | continue; | |
1412 | if (nfs4_stateid_match_other(&pos->ls_stateid, stateid)) | |
1413 | return pos; | |
1414 | } | |
1415 | return NULL; | |
1416 | } | |
1417 | ||
1418 | static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state, | |
1419 | const nfs4_stateid *stateid) | |
1420 | { | |
1421 | bool found = false; | |
1422 | ||
1423 | if (test_bit(LK_STATE_IN_USE, &state->flags)) { | |
1424 | spin_lock(&state->state_lock); | |
1425 | if (nfs_state_find_lock_state_by_stateid(state, stateid)) | |
1426 | found = true; | |
1427 | spin_unlock(&state->state_lock); | |
1428 | } | |
1429 | return found; | |
1430 | } | |
1431 | ||
a1d0b5ee TM |
1432 | void nfs_inode_find_state_and_recover(struct inode *inode, |
1433 | const nfs4_stateid *stateid) | |
1434 | { | |
1435 | struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; | |
1436 | struct nfs_inode *nfsi = NFS_I(inode); | |
1437 | struct nfs_open_context *ctx; | |
1438 | struct nfs4_state *state; | |
1439 | bool found = false; | |
1440 | ||
0de43976 TM |
1441 | rcu_read_lock(); |
1442 | list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { | |
a1d0b5ee TM |
1443 | state = ctx->state; |
1444 | if (state == NULL) | |
1445 | continue; | |
7ebeb7fe TM |
1446 | if (nfs4_stateid_match_other(&state->stateid, stateid) && |
1447 | nfs4_state_mark_reclaim_nograce(clp, state)) { | |
6c2d8f8d | 1448 | found = true; |
a1d0b5ee | 1449 | continue; |
6c2d8f8d | 1450 | } |
46280d9d TM |
1451 | if (nfs4_stateid_match_other(&state->open_stateid, stateid) && |
1452 | nfs4_state_mark_reclaim_nograce(clp, state)) { | |
1453 | found = true; | |
1454 | continue; | |
1455 | } | |
7ebeb7fe TM |
1456 | if (nfs_state_lock_state_matches_stateid(state, stateid) && |
1457 | nfs4_state_mark_reclaim_nograce(clp, state)) | |
6c2d8f8d | 1458 | found = true; |
a1d0b5ee | 1459 | } |
0de43976 | 1460 | rcu_read_unlock(); |
6c2d8f8d TM |
1461 | |
1462 | nfs_inode_find_delegation_state_and_recover(inode, stateid); | |
a1d0b5ee TM |
1463 | if (found) |
1464 | nfs4_schedule_state_manager(clp); | |
1465 | } | |
1466 | ||
c58c8441 TM |
1467 | static void nfs4_state_mark_open_context_bad(struct nfs4_state *state) |
1468 | { | |
1469 | struct inode *inode = state->inode; | |
1470 | struct nfs_inode *nfsi = NFS_I(inode); | |
1471 | struct nfs_open_context *ctx; | |
1472 | ||
0de43976 TM |
1473 | rcu_read_lock(); |
1474 | list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { | |
c58c8441 TM |
1475 | if (ctx->state != state) |
1476 | continue; | |
1477 | set_bit(NFS_CONTEXT_BAD, &ctx->flags); | |
1478 | } | |
0de43976 | 1479 | rcu_read_unlock(); |
c58c8441 TM |
1480 | } |
1481 | ||
5d422301 TM |
1482 | static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
1483 | { | |
1484 | set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); | |
c58c8441 | 1485 | nfs4_state_mark_open_context_bad(state); |
5d422301 TM |
1486 | } |
1487 | ||
a1d0b5ee | 1488 | |
02860014 | 1489 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1490 | { |
1491 | struct inode *inode = state->inode; | |
19e03c57 | 1492 | struct nfs_inode *nfsi = NFS_I(inode); |
1da177e4 | 1493 | struct file_lock *fl; |
dce2630c | 1494 | struct nfs4_lock_state *lsp; |
1da177e4 | 1495 | int status = 0; |
5263e31e | 1496 | struct file_lock_context *flctx = inode->i_flctx; |
bd61e0a9 | 1497 | struct list_head *list; |
1da177e4 | 1498 | |
bd61e0a9 | 1499 | if (flctx == NULL) |
3f09df70 TM |
1500 | return 0; |
1501 | ||
bd61e0a9 JL |
1502 | list = &flctx->flc_posix; |
1503 | ||
3f09df70 | 1504 | /* Guard against delegation returns and new lock/unlock calls */ |
19e03c57 | 1505 | down_write(&nfsi->rwsem); |
6109c850 | 1506 | spin_lock(&flctx->flc_lock); |
bd61e0a9 JL |
1507 | restart: |
1508 | list_for_each_entry(fl, list, fl_list) { | |
5263e31e JL |
1509 | if (nfs_file_open_context(fl->fl_file)->state != state) |
1510 | continue; | |
6109c850 | 1511 | spin_unlock(&flctx->flc_lock); |
5263e31e JL |
1512 | status = ops->recover_lock(state, fl); |
1513 | switch (status) { | |
1514 | case 0: | |
1515 | break; | |
1516 | case -ESTALE: | |
1517 | case -NFS4ERR_ADMIN_REVOKED: | |
1518 | case -NFS4ERR_STALE_STATEID: | |
1519 | case -NFS4ERR_BAD_STATEID: | |
1520 | case -NFS4ERR_EXPIRED: | |
1521 | case -NFS4ERR_NO_GRACE: | |
1522 | case -NFS4ERR_STALE_CLIENTID: | |
1523 | case -NFS4ERR_BADSESSION: | |
1524 | case -NFS4ERR_BADSLOT: | |
1525 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1526 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1527 | goto out; | |
1528 | default: | |
1529 | pr_err("NFS: %s: unhandled error %d\n", | |
1530 | __func__, status); | |
01e03bdc | 1531 | /* Fall through */ |
5263e31e JL |
1532 | case -ENOMEM: |
1533 | case -NFS4ERR_DENIED: | |
1534 | case -NFS4ERR_RECLAIM_BAD: | |
1535 | case -NFS4ERR_RECLAIM_CONFLICT: | |
dce2630c N |
1536 | lsp = fl->fl_u.nfs4_fl.owner; |
1537 | if (lsp) | |
1538 | set_bit(NFS_LOCK_LOST, &lsp->ls_flags); | |
5263e31e JL |
1539 | status = 0; |
1540 | } | |
6109c850 | 1541 | spin_lock(&flctx->flc_lock); |
5263e31e | 1542 | } |
bd61e0a9 JL |
1543 | if (list == &flctx->flc_posix) { |
1544 | list = &flctx->flc_flock; | |
1545 | goto restart; | |
1546 | } | |
6109c850 | 1547 | spin_unlock(&flctx->flc_lock); |
965b5d67 | 1548 | out: |
19e03c57 | 1549 | up_write(&nfsi->rwsem); |
1da177e4 LT |
1550 | return status; |
1551 | } | |
1552 | ||
80f42368 AS |
1553 | #ifdef CONFIG_NFS_V4_2 |
1554 | static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
1555 | { | |
1556 | struct nfs4_copy_state *copy; | |
1557 | ||
1558 | if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags)) | |
1559 | return; | |
1560 | ||
1561 | spin_lock(&sp->so_server->nfs_client->cl_lock); | |
1562 | list_for_each_entry(copy, &sp->so_server->ss_copies, copies) { | |
9aeaf8cf | 1563 | if (!nfs4_stateid_match_other(&state->stateid, ©->parent_state->stateid)) |
80f42368 AS |
1564 | continue; |
1565 | copy->flags = 1; | |
1566 | complete(©->completion); | |
1567 | break; | |
1568 | } | |
1569 | spin_unlock(&sp->so_server->nfs_client->cl_lock); | |
1570 | } | |
1571 | #else /* !CONFIG_NFS_V4_2 */ | |
1572 | static inline void nfs42_complete_copies(struct nfs4_state_owner *sp, | |
1573 | struct nfs4_state *state) | |
1574 | { | |
1575 | } | |
1576 | #endif /* CONFIG_NFS_V4_2 */ | |
1577 | ||
cb7a8384 AS |
1578 | static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state, |
1579 | const struct nfs4_state_recovery_ops *ops) | |
1580 | { | |
1581 | struct nfs4_lock_state *lock; | |
1582 | int status; | |
1583 | ||
1584 | status = ops->recover_open(sp, state); | |
1585 | if (status < 0) | |
1586 | return status; | |
1587 | ||
1588 | status = nfs4_reclaim_locks(state, ops); | |
1589 | if (status < 0) | |
1590 | return status; | |
1591 | ||
1592 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) { | |
1593 | spin_lock(&state->state_lock); | |
1594 | list_for_each_entry(lock, &state->lock_states, ls_locks) { | |
1595 | if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) | |
1596 | pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__); | |
1597 | } | |
1598 | spin_unlock(&state->state_lock); | |
1599 | } | |
1600 | ||
80f42368 | 1601 | nfs42_complete_copies(sp, state); |
cb7a8384 AS |
1602 | clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
1603 | return status; | |
1604 | } | |
1605 | ||
02860014 | 1606 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 LT |
1607 | { |
1608 | struct nfs4_state *state; | |
1da177e4 LT |
1609 | int status = 0; |
1610 | ||
1611 | /* Note: we rely on the sp->so_states list being ordered | |
1612 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) | |
1613 | * states first. | |
1614 | * This is needed to ensure that the server won't give us any | |
1615 | * read delegations that we have to return if, say, we are | |
1616 | * recovering after a network partition or a reboot from a | |
1617 | * server that doesn't support a grace period. | |
1618 | */ | |
fe1d8195 | 1619 | spin_lock(&sp->so_lock); |
abbec2da | 1620 | raw_write_seqcount_begin(&sp->so_reclaim_seqcount); |
c137afab | 1621 | restart: |
1da177e4 | 1622 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1623 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
1624 | continue; | |
5d422301 TM |
1625 | if (!nfs4_valid_open_stateid(state)) |
1626 | continue; | |
1da177e4 LT |
1627 | if (state->state == 0) |
1628 | continue; | |
ace9fad4 | 1629 | refcount_inc(&state->count); |
fe1d8195 | 1630 | spin_unlock(&sp->so_lock); |
cb7a8384 | 1631 | status = __nfs4_reclaim_open_state(sp, state, ops); |
cb7a8384 | 1632 | |
1da177e4 | 1633 | switch (status) { |
35a61606 AS |
1634 | default: |
1635 | if (status >= 0) | |
b79a4a1b | 1636 | break; |
35a61606 AS |
1637 | printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status); |
1638 | /* Fall through */ | |
1639 | case -ENOENT: | |
1640 | case -ENOMEM: | |
1641 | case -EACCES: | |
1642 | case -EROFS: | |
1643 | case -EIO: | |
1644 | case -ESTALE: | |
1645 | /* Open state on this file cannot be recovered */ | |
1646 | nfs4_state_mark_recovery_failed(state, status); | |
1647 | break; | |
1648 | case -EAGAIN: | |
1649 | ssleep(1); | |
1650 | /* Fall through */ | |
1651 | case -NFS4ERR_ADMIN_REVOKED: | |
1652 | case -NFS4ERR_STALE_STATEID: | |
1653 | case -NFS4ERR_OLD_STATEID: | |
1654 | case -NFS4ERR_BAD_STATEID: | |
1655 | case -NFS4ERR_RECLAIM_BAD: | |
1656 | case -NFS4ERR_RECLAIM_CONFLICT: | |
1657 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1658 | break; | |
1659 | case -NFS4ERR_EXPIRED: | |
1660 | case -NFS4ERR_NO_GRACE: | |
1661 | nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); | |
1662 | case -NFS4ERR_STALE_CLIENTID: | |
1663 | case -NFS4ERR_BADSESSION: | |
1664 | case -NFS4ERR_BADSLOT: | |
1665 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1666 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1667 | goto out_err; | |
1da177e4 | 1668 | } |
fe1d8195 | 1669 | nfs4_put_open_state(state); |
c137afab | 1670 | spin_lock(&sp->so_lock); |
fe1d8195 | 1671 | goto restart; |
1da177e4 | 1672 | } |
abbec2da | 1673 | raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
fe1d8195 | 1674 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1675 | return 0; |
1676 | out_err: | |
fe1d8195 | 1677 | nfs4_put_open_state(state); |
c137afab | 1678 | spin_lock(&sp->so_lock); |
abbec2da | 1679 | raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
c137afab | 1680 | spin_unlock(&sp->so_lock); |
1da177e4 LT |
1681 | return status; |
1682 | } | |
1683 | ||
b79a4a1b TM |
1684 | static void nfs4_clear_open_state(struct nfs4_state *state) |
1685 | { | |
1686 | struct nfs4_lock_state *lock; | |
1687 | ||
1688 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
1689 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); | |
1690 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); | |
1691 | clear_bit(NFS_O_RDWR_STATE, &state->flags); | |
4b44b40e | 1692 | spin_lock(&state->state_lock); |
b79a4a1b | 1693 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
b79a4a1b | 1694 | lock->ls_seqid.flags = 0; |
795a88c9 | 1695 | clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
b79a4a1b | 1696 | } |
4b44b40e | 1697 | spin_unlock(&state->state_lock); |
b79a4a1b TM |
1698 | } |
1699 | ||
24d292b8 CL |
1700 | static void nfs4_reset_seqids(struct nfs_server *server, |
1701 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
cee54fc9 | 1702 | { |
24d292b8 | 1703 | struct nfs_client *clp = server->nfs_client; |
cee54fc9 | 1704 | struct nfs4_state_owner *sp; |
9f958ab8 | 1705 | struct rb_node *pos; |
cee54fc9 | 1706 | struct nfs4_state *state; |
cee54fc9 | 1707 | |
24d292b8 CL |
1708 | spin_lock(&clp->cl_lock); |
1709 | for (pos = rb_first(&server->state_owners); | |
1710 | pos != NULL; | |
1711 | pos = rb_next(pos)) { | |
1712 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
cee54fc9 | 1713 | sp->so_seqid.flags = 0; |
ec073428 | 1714 | spin_lock(&sp->so_lock); |
cee54fc9 | 1715 | list_for_each_entry(state, &sp->so_states, open_states) { |
b79a4a1b TM |
1716 | if (mark_reclaim(clp, state)) |
1717 | nfs4_clear_open_state(state); | |
cee54fc9 | 1718 | } |
ec073428 | 1719 | spin_unlock(&sp->so_lock); |
cee54fc9 | 1720 | } |
24d292b8 CL |
1721 | spin_unlock(&clp->cl_lock); |
1722 | } | |
1723 | ||
1724 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, | |
1725 | int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) | |
1726 | { | |
1727 | struct nfs_server *server; | |
1728 | ||
1729 | rcu_read_lock(); | |
1730 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1731 | nfs4_reset_seqids(server, mark_reclaim); | |
1732 | rcu_read_unlock(); | |
cee54fc9 TM |
1733 | } |
1734 | ||
b79a4a1b TM |
1735 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
1736 | { | |
1737 | /* Mark all delegations for reclaim */ | |
1738 | nfs_delegation_mark_reclaim(clp); | |
1739 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); | |
1740 | } | |
1741 | ||
0048fdd0 | 1742 | static int nfs4_reclaim_complete(struct nfs_client *clp, |
965e9c23 | 1743 | const struct nfs4_state_recovery_ops *ops, |
a52458b4 | 1744 | const struct cred *cred) |
fce5c838 RL |
1745 | { |
1746 | /* Notify the server we're done reclaiming our state */ | |
1747 | if (ops->reclaim_complete) | |
0048fdd0 TM |
1748 | return ops->reclaim_complete(clp, cred); |
1749 | return 0; | |
fce5c838 RL |
1750 | } |
1751 | ||
24d292b8 | 1752 | static void nfs4_clear_reclaim_server(struct nfs_server *server) |
b79a4a1b | 1753 | { |
24d292b8 | 1754 | struct nfs_client *clp = server->nfs_client; |
b79a4a1b TM |
1755 | struct nfs4_state_owner *sp; |
1756 | struct rb_node *pos; | |
1757 | struct nfs4_state *state; | |
1758 | ||
24d292b8 CL |
1759 | spin_lock(&clp->cl_lock); |
1760 | for (pos = rb_first(&server->state_owners); | |
1761 | pos != NULL; | |
1762 | pos = rb_next(pos)) { | |
1763 | sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); | |
b79a4a1b TM |
1764 | spin_lock(&sp->so_lock); |
1765 | list_for_each_entry(state, &sp->so_states, open_states) { | |
24d292b8 CL |
1766 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
1767 | &state->flags)) | |
b79a4a1b TM |
1768 | continue; |
1769 | nfs4_state_mark_reclaim_nograce(clp, state); | |
1770 | } | |
1771 | spin_unlock(&sp->so_lock); | |
1772 | } | |
24d292b8 CL |
1773 | spin_unlock(&clp->cl_lock); |
1774 | } | |
1775 | ||
1776 | static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) | |
1777 | { | |
1778 | struct nfs_server *server; | |
1779 | ||
1780 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) | |
1781 | return 0; | |
1782 | ||
1783 | rcu_read_lock(); | |
1784 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) | |
1785 | nfs4_clear_reclaim_server(server); | |
1786 | rcu_read_unlock(); | |
b79a4a1b TM |
1787 | |
1788 | nfs_delegation_reap_unclaimed(clp); | |
6eaa6149 TM |
1789 | return 1; |
1790 | } | |
1791 | ||
1792 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) | |
1793 | { | |
965e9c23 | 1794 | const struct nfs4_state_recovery_ops *ops; |
a52458b4 | 1795 | const struct cred *cred; |
0048fdd0 | 1796 | int err; |
965e9c23 | 1797 | |
6eaa6149 TM |
1798 | if (!nfs4_state_clear_reclaim_reboot(clp)) |
1799 | return; | |
965e9c23 | 1800 | ops = clp->cl_mvops->reboot_recovery_ops; |
73d8bde5 | 1801 | cred = nfs4_get_clid_cred(clp); |
0048fdd0 | 1802 | err = nfs4_reclaim_complete(clp, ops, cred); |
a52458b4 | 1803 | put_cred(cred); |
0048fdd0 TM |
1804 | if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION) |
1805 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
b79a4a1b TM |
1806 | } |
1807 | ||
b79a4a1b TM |
1808 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
1809 | { | |
45870d69 | 1810 | nfs_mark_test_expired_all_delegations(clp); |
b79a4a1b TM |
1811 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
1812 | } | |
1813 | ||
4f7cdf18 | 1814 | static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
e598d843 TM |
1815 | { |
1816 | switch (error) { | |
000d3f95 AS |
1817 | case 0: |
1818 | break; | |
1819 | case -NFS4ERR_CB_PATH_DOWN: | |
1820 | nfs40_handle_cb_pathdown(clp); | |
1821 | break; | |
1822 | case -NFS4ERR_NO_GRACE: | |
1823 | nfs4_state_end_reclaim_reboot(clp); | |
1824 | break; | |
1825 | case -NFS4ERR_STALE_CLIENTID: | |
1826 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1827 | nfs4_state_start_reclaim_reboot(clp); | |
1828 | break; | |
1829 | case -NFS4ERR_EXPIRED: | |
1830 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
1831 | nfs4_state_start_reclaim_nograce(clp); | |
1832 | break; | |
1833 | case -NFS4ERR_BADSESSION: | |
1834 | case -NFS4ERR_BADSLOT: | |
1835 | case -NFS4ERR_BAD_HIGH_SLOT: | |
1836 | case -NFS4ERR_DEADSESSION: | |
1837 | case -NFS4ERR_SEQ_FALSE_RETRY: | |
1838 | case -NFS4ERR_SEQ_MISORDERED: | |
1839 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
1840 | /* Zero session reset errors */ | |
1841 | break; | |
1842 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
1843 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
1844 | break; | |
1845 | default: | |
1846 | dprintk("%s: failed to handle error %d for server %s\n", | |
1847 | __func__, error, clp->cl_hostname); | |
1848 | return error; | |
e598d843 | 1849 | } |
cc0a9843 TM |
1850 | dprintk("%s: handled error %d for server %s\n", __func__, error, |
1851 | clp->cl_hostname); | |
4f38e4aa | 1852 | return 0; |
e598d843 TM |
1853 | } |
1854 | ||
02860014 | 1855 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
1da177e4 | 1856 | { |
24d292b8 CL |
1857 | struct nfs4_state_owner *sp; |
1858 | struct nfs_server *server; | |
9f958ab8 | 1859 | struct rb_node *pos; |
1da177e4 LT |
1860 | int status = 0; |
1861 | ||
7eff03ae | 1862 | restart: |
24d292b8 CL |
1863 | rcu_read_lock(); |
1864 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
0aaaf5c4 | 1865 | nfs4_purge_state_owners(server); |
24d292b8 CL |
1866 | spin_lock(&clp->cl_lock); |
1867 | for (pos = rb_first(&server->state_owners); | |
1868 | pos != NULL; | |
1869 | pos = rb_next(pos)) { | |
1870 | sp = rb_entry(pos, | |
1871 | struct nfs4_state_owner, so_server_node); | |
1872 | if (!test_and_clear_bit(ops->owner_flag_bit, | |
1873 | &sp->so_flags)) | |
1874 | continue; | |
4a0954ef TM |
1875 | if (!atomic_inc_not_zero(&sp->so_count)) |
1876 | continue; | |
24d292b8 CL |
1877 | spin_unlock(&clp->cl_lock); |
1878 | rcu_read_unlock(); | |
1879 | ||
1880 | status = nfs4_reclaim_open_state(sp, ops); | |
1881 | if (status < 0) { | |
1882 | set_bit(ops->owner_flag_bit, &sp->so_flags); | |
1883 | nfs4_put_state_owner(sp); | |
df817ba3 TM |
1884 | status = nfs4_recovery_handle_error(clp, status); |
1885 | return (status != 0) ? status : -EAGAIN; | |
24d292b8 CL |
1886 | } |
1887 | ||
7eff03ae | 1888 | nfs4_put_state_owner(sp); |
24d292b8 | 1889 | goto restart; |
7eff03ae | 1890 | } |
24d292b8 | 1891 | spin_unlock(&clp->cl_lock); |
02860014 | 1892 | } |
24d292b8 | 1893 | rcu_read_unlock(); |
df817ba3 | 1894 | return 0; |
02860014 TM |
1895 | } |
1896 | ||
1897 | static int nfs4_check_lease(struct nfs_client *clp) | |
1898 | { | |
a52458b4 | 1899 | const struct cred *cred; |
c48f4f35 TM |
1900 | const struct nfs4_state_maintenance_ops *ops = |
1901 | clp->cl_mvops->state_renewal_ops; | |
4f38e4aa | 1902 | int status; |
1da177e4 | 1903 | |
0f605b56 TM |
1904 | /* Is the client already known to have an expired lease? */ |
1905 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
1906 | return 0; | |
f15e1e8b | 1907 | cred = ops->get_state_renewal_cred(clp); |
0f605b56 | 1908 | if (cred == NULL) { |
73d8bde5 | 1909 | cred = nfs4_get_clid_cred(clp); |
4f38e4aa | 1910 | status = -ENOKEY; |
0f605b56 TM |
1911 | if (cred == NULL) |
1912 | goto out; | |
286d7d6a | 1913 | } |
8e69514f | 1914 | status = ops->renew_lease(clp, cred); |
a52458b4 | 1915 | put_cred(cred); |
bc7a05ca TM |
1916 | if (status == -ETIMEDOUT) { |
1917 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
1918 | return 0; | |
1919 | } | |
0f605b56 | 1920 | out: |
4f7cdf18 | 1921 | return nfs4_recovery_handle_error(clp, status); |
02860014 TM |
1922 | } |
1923 | ||
47b803c8 AA |
1924 | /* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
1925 | * and for recoverable errors on EXCHANGE_ID for v4.1 | |
2a6ee6aa TM |
1926 | */ |
1927 | static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) | |
1928 | { | |
1929 | switch (status) { | |
89a21736 TM |
1930 | case -NFS4ERR_SEQ_MISORDERED: |
1931 | if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) | |
1932 | return -ESERVERFAULT; | |
1933 | /* Lease confirmation error: retry after purging the lease */ | |
1934 | ssleep(1); | |
47b803c8 AA |
1935 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
1936 | break; | |
2a6ee6aa TM |
1937 | case -NFS4ERR_STALE_CLIENTID: |
1938 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
47b803c8 | 1939 | nfs4_state_start_reclaim_reboot(clp); |
2a6ee6aa | 1940 | break; |
de734831 CL |
1941 | case -NFS4ERR_CLID_INUSE: |
1942 | pr_err("NFS: Server %s reports our clientid is in use\n", | |
1943 | clp->cl_hostname); | |
1944 | nfs_mark_client_ready(clp, -EPERM); | |
1945 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); | |
1946 | return -EPERM; | |
2a6ee6aa | 1947 | case -EACCES: |
2a6ee6aa TM |
1948 | case -NFS4ERR_DELAY: |
1949 | case -ETIMEDOUT: | |
1950 | case -EAGAIN: | |
1951 | ssleep(1); | |
1952 | break; | |
1953 | ||
1954 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
1955 | if (clp->cl_cons_state == NFS_CS_SESSION_INITING) | |
1956 | nfs_mark_client_ready(clp, -EPROTONOSUPPORT); | |
cc0a9843 TM |
1957 | dprintk("%s: exit with error %d for server %s\n", |
1958 | __func__, -EPROTONOSUPPORT, clp->cl_hostname); | |
2a6ee6aa | 1959 | return -EPROTONOSUPPORT; |
2a6ee6aa TM |
1960 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
1961 | * in nfs4_exchange_id */ | |
1962 | default: | |
cc0a9843 TM |
1963 | dprintk("%s: exit with error %d for server %s\n", __func__, |
1964 | status, clp->cl_hostname); | |
2a6ee6aa TM |
1965 | return status; |
1966 | } | |
1967 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
cc0a9843 TM |
1968 | dprintk("%s: handled error %d for server %s\n", __func__, status, |
1969 | clp->cl_hostname); | |
2a6ee6aa TM |
1970 | return 0; |
1971 | } | |
1972 | ||
b42353ff | 1973 | static int nfs4_establish_lease(struct nfs_client *clp) |
02860014 | 1974 | { |
a52458b4 | 1975 | const struct cred *cred; |
c48f4f35 TM |
1976 | const struct nfs4_state_recovery_ops *ops = |
1977 | clp->cl_mvops->reboot_recovery_ops; | |
2a6ee6aa | 1978 | int status; |
02860014 | 1979 | |
8aafd2fd TM |
1980 | status = nfs4_begin_drain_session(clp); |
1981 | if (status != 0) | |
1982 | return status; | |
73d8bde5 | 1983 | cred = nfs4_get_clid_cred(clp); |
2a6ee6aa TM |
1984 | if (cred == NULL) |
1985 | return -ENOENT; | |
1986 | status = ops->establish_clid(clp, cred); | |
a52458b4 | 1987 | put_cred(cred); |
2a6ee6aa | 1988 | if (status != 0) |
b42353ff TM |
1989 | return status; |
1990 | pnfs_destroy_all_layouts(clp); | |
1991 | return 0; | |
1992 | } | |
1993 | ||
6bbb4ae8 CL |
1994 | /* |
1995 | * Returns zero or a negative errno. NFS4ERR values are converted | |
1996 | * to local errno values. | |
1997 | */ | |
b42353ff TM |
1998 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
1999 | { | |
2000 | int status; | |
2001 | ||
2002 | status = nfs4_establish_lease(clp); | |
2003 | if (status < 0) | |
2004 | return nfs4_handle_reclaim_lease_error(clp, status); | |
2005 | if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) | |
2006 | nfs4_state_start_reclaim_nograce(clp); | |
2007 | if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) | |
2008 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); | |
2009 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
2010 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
2011 | return 0; | |
2012 | } | |
2013 | ||
2014 | static int nfs4_purge_lease(struct nfs_client *clp) | |
2015 | { | |
2016 | int status; | |
2017 | ||
2018 | status = nfs4_establish_lease(clp); | |
2019 | if (status < 0) | |
2a6ee6aa | 2020 | return nfs4_handle_reclaim_lease_error(clp, status); |
b42353ff TM |
2021 | clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
2022 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
2023 | nfs4_state_start_reclaim_nograce(clp); | |
2a6ee6aa | 2024 | return 0; |
02860014 TM |
2025 | } |
2026 | ||
c9fdeb28 CL |
2027 | /* |
2028 | * Try remote migration of one FSID from a source server to a | |
2029 | * destination server. The source server provides a list of | |
2030 | * potential destinations. | |
2031 | * | |
2032 | * Returns zero or a negative NFS4ERR status code. | |
2033 | */ | |
a52458b4 | 2034 | static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred) |
c9fdeb28 CL |
2035 | { |
2036 | struct nfs_client *clp = server->nfs_client; | |
2037 | struct nfs4_fs_locations *locations = NULL; | |
2038 | struct inode *inode; | |
2039 | struct page *page; | |
2040 | int status, result; | |
2041 | ||
2042 | dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__, | |
2043 | (unsigned long long)server->fsid.major, | |
2044 | (unsigned long long)server->fsid.minor, | |
2045 | clp->cl_hostname); | |
2046 | ||
2047 | result = 0; | |
2048 | page = alloc_page(GFP_KERNEL); | |
2049 | locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); | |
2050 | if (page == NULL || locations == NULL) { | |
2051 | dprintk("<-- %s: no memory\n", __func__); | |
2052 | goto out; | |
2053 | } | |
2054 | ||
2b0143b5 | 2055 | inode = d_inode(server->super->s_root); |
c9fdeb28 CL |
2056 | result = nfs4_proc_get_locations(inode, locations, page, cred); |
2057 | if (result) { | |
2058 | dprintk("<-- %s: failed to retrieve fs_locations: %d\n", | |
2059 | __func__, result); | |
2060 | goto out; | |
2061 | } | |
2062 | ||
2063 | result = -NFS4ERR_NXIO; | |
2064 | if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) { | |
2065 | dprintk("<-- %s: No fs_locations data, migration skipped\n", | |
2066 | __func__); | |
2067 | goto out; | |
2068 | } | |
2069 | ||
8aafd2fd TM |
2070 | status = nfs4_begin_drain_session(clp); |
2071 | if (status != 0) | |
2072 | return status; | |
c9fdeb28 CL |
2073 | |
2074 | status = nfs4_replace_transport(server, locations); | |
2075 | if (status != 0) { | |
2076 | dprintk("<-- %s: failed to replace transport: %d\n", | |
2077 | __func__, status); | |
2078 | goto out; | |
2079 | } | |
2080 | ||
2081 | result = 0; | |
2082 | dprintk("<-- %s: migration succeeded\n", __func__); | |
2083 | ||
2084 | out: | |
2085 | if (page != NULL) | |
2086 | __free_page(page); | |
2087 | kfree(locations); | |
2088 | if (result) { | |
2089 | pr_err("NFS: migration recovery failed (server %s)\n", | |
2090 | clp->cl_hostname); | |
2091 | set_bit(NFS_MIG_FAILED, &server->mig_status); | |
2092 | } | |
2093 | return result; | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * Returns zero or a negative NFS4ERR status code. | |
2098 | */ | |
2099 | static int nfs4_handle_migration(struct nfs_client *clp) | |
2100 | { | |
2101 | const struct nfs4_state_maintenance_ops *ops = | |
2102 | clp->cl_mvops->state_renewal_ops; | |
2103 | struct nfs_server *server; | |
a52458b4 | 2104 | const struct cred *cred; |
c9fdeb28 CL |
2105 | |
2106 | dprintk("%s: migration reported on \"%s\"\n", __func__, | |
2107 | clp->cl_hostname); | |
2108 | ||
f15e1e8b | 2109 | cred = ops->get_state_renewal_cred(clp); |
c9fdeb28 CL |
2110 | if (cred == NULL) |
2111 | return -NFS4ERR_NOENT; | |
2112 | ||
2113 | clp->cl_mig_gen++; | |
2114 | restart: | |
2115 | rcu_read_lock(); | |
2116 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
2117 | int status; | |
2118 | ||
2119 | if (server->mig_gen == clp->cl_mig_gen) | |
2120 | continue; | |
2121 | server->mig_gen = clp->cl_mig_gen; | |
2122 | ||
2123 | if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION, | |
2124 | &server->mig_status)) | |
2125 | continue; | |
2126 | ||
2127 | rcu_read_unlock(); | |
2128 | status = nfs4_try_migration(server, cred); | |
2129 | if (status < 0) { | |
a52458b4 | 2130 | put_cred(cred); |
c9fdeb28 CL |
2131 | return status; |
2132 | } | |
2133 | goto restart; | |
2134 | } | |
2135 | rcu_read_unlock(); | |
a52458b4 | 2136 | put_cred(cred); |
c9fdeb28 CL |
2137 | return 0; |
2138 | } | |
2139 | ||
b7f7a66e CL |
2140 | /* |
2141 | * Test each nfs_server on the clp's cl_superblocks list to see | |
2142 | * if it's moved to another server. Stop when the server no longer | |
2143 | * returns NFS4ERR_LEASE_MOVED. | |
2144 | */ | |
2145 | static int nfs4_handle_lease_moved(struct nfs_client *clp) | |
2146 | { | |
2147 | const struct nfs4_state_maintenance_ops *ops = | |
2148 | clp->cl_mvops->state_renewal_ops; | |
2149 | struct nfs_server *server; | |
a52458b4 | 2150 | const struct cred *cred; |
b7f7a66e CL |
2151 | |
2152 | dprintk("%s: lease moved reported on \"%s\"\n", __func__, | |
2153 | clp->cl_hostname); | |
2154 | ||
f15e1e8b | 2155 | cred = ops->get_state_renewal_cred(clp); |
b7f7a66e CL |
2156 | if (cred == NULL) |
2157 | return -NFS4ERR_NOENT; | |
2158 | ||
2159 | clp->cl_mig_gen++; | |
2160 | restart: | |
2161 | rcu_read_lock(); | |
2162 | list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { | |
2163 | struct inode *inode; | |
2164 | int status; | |
2165 | ||
2166 | if (server->mig_gen == clp->cl_mig_gen) | |
2167 | continue; | |
2168 | server->mig_gen = clp->cl_mig_gen; | |
2169 | ||
2170 | rcu_read_unlock(); | |
2171 | ||
2b0143b5 | 2172 | inode = d_inode(server->super->s_root); |
b7f7a66e CL |
2173 | status = nfs4_proc_fsid_present(inode, cred); |
2174 | if (status != -NFS4ERR_MOVED) | |
2175 | goto restart; /* wasn't this one */ | |
2176 | if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED) | |
2177 | goto restart; /* there are more */ | |
2178 | goto out; | |
2179 | } | |
2180 | rcu_read_unlock(); | |
2181 | ||
2182 | out: | |
a52458b4 | 2183 | put_cred(cred); |
b7f7a66e CL |
2184 | return 0; |
2185 | } | |
2186 | ||
05f4c350 CL |
2187 | /** |
2188 | * nfs4_discover_server_trunking - Detect server IP address trunking | |
2189 | * | |
2190 | * @clp: nfs_client under test | |
2191 | * @result: OUT: found nfs_client, or clp | |
2192 | * | |
2193 | * Returns zero or a negative errno. If zero is returned, | |
2194 | * an nfs_client pointer is planted in "result". | |
2195 | * | |
2196 | * Note: since we are invoked in process context, and | |
2197 | * not from inside the state manager, we cannot use | |
2198 | * nfs4_handle_reclaim_lease_error(). | |
2199 | */ | |
2200 | int nfs4_discover_server_trunking(struct nfs_client *clp, | |
2201 | struct nfs_client **result) | |
2202 | { | |
2203 | const struct nfs4_state_recovery_ops *ops = | |
2204 | clp->cl_mvops->reboot_recovery_ops; | |
05f4c350 | 2205 | struct rpc_clnt *clnt; |
a52458b4 | 2206 | const struct cred *cred; |
4edaa308 | 2207 | int i, status; |
05f4c350 CL |
2208 | |
2209 | dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); | |
2210 | ||
05f4c350 | 2211 | clnt = clp->cl_rpcclient; |
05f4c350 CL |
2212 | i = 0; |
2213 | ||
2214 | mutex_lock(&nfs_clid_init_mutex); | |
05f4c350 | 2215 | again: |
ea33e6c3 | 2216 | status = -ENOENT; |
73d8bde5 | 2217 | cred = nfs4_get_clid_cred(clp); |
05f4c350 CL |
2218 | if (cred == NULL) |
2219 | goto out_unlock; | |
2220 | ||
2221 | status = ops->detect_trunking(clp, result, cred); | |
a52458b4 | 2222 | put_cred(cred); |
05f4c350 CL |
2223 | switch (status) { |
2224 | case 0: | |
898fc11b TM |
2225 | case -EINTR: |
2226 | case -ERESTARTSYS: | |
05f4c350 | 2227 | break; |
05f4c350 | 2228 | case -ETIMEDOUT: |
150e7260 TM |
2229 | if (clnt->cl_softrtry) |
2230 | break; | |
01e03bdc | 2231 | /* Fall through */ |
150e7260 | 2232 | case -NFS4ERR_DELAY: |
05f4c350 CL |
2233 | case -EAGAIN: |
2234 | ssleep(1); | |
01e03bdc | 2235 | /* Fall through */ |
202c312d | 2236 | case -NFS4ERR_STALE_CLIENTID: |
05f4c350 CL |
2237 | dprintk("NFS: %s after status %d, retrying\n", |
2238 | __func__, status); | |
2239 | goto again; | |
4edaa308 | 2240 | case -EACCES: |
d688f7b8 CL |
2241 | if (i++ == 0) { |
2242 | nfs4_root_machine_cred(clp); | |
2243 | goto again; | |
2244 | } | |
6d769f1e | 2245 | if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) |
4edaa308 | 2246 | break; |
01e03bdc | 2247 | /* Fall through */ |
05f4c350 CL |
2248 | case -NFS4ERR_CLID_INUSE: |
2249 | case -NFS4ERR_WRONGSEC: | |
6d769f1e JL |
2250 | /* No point in retrying if we already used RPC_AUTH_UNIX */ |
2251 | if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) { | |
2252 | status = -EPERM; | |
2253 | break; | |
2254 | } | |
79d852bf | 2255 | clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
05f4c350 CL |
2256 | if (IS_ERR(clnt)) { |
2257 | status = PTR_ERR(clnt); | |
2258 | break; | |
2259 | } | |
b193d59a TM |
2260 | /* Note: this is safe because we haven't yet marked the |
2261 | * client as ready, so we are the only user of | |
2262 | * clp->cl_rpcclient | |
2263 | */ | |
2264 | clnt = xchg(&clp->cl_rpcclient, clnt); | |
2265 | rpc_shutdown_client(clnt); | |
2266 | clnt = clp->cl_rpcclient; | |
05f4c350 CL |
2267 | goto again; |
2268 | ||
2269 | case -NFS4ERR_MINOR_VERS_MISMATCH: | |
2270 | status = -EPROTONOSUPPORT; | |
2271 | break; | |
2272 | ||
2273 | case -EKEYEXPIRED: | |
05f4c350 CL |
2274 | case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
2275 | * in nfs4_exchange_id */ | |
2276 | status = -EKEYEXPIRED; | |
ea33e6c3 TM |
2277 | break; |
2278 | default: | |
2279 | pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", | |
2280 | __func__, status); | |
2281 | status = -EIO; | |
05f4c350 CL |
2282 | } |
2283 | ||
2284 | out_unlock: | |
2285 | mutex_unlock(&nfs_clid_init_mutex); | |
05f4c350 CL |
2286 | dprintk("NFS: %s: status = %d\n", __func__, status); |
2287 | return status; | |
2288 | } | |
2289 | ||
76db6d95 | 2290 | #ifdef CONFIG_NFS_V4_1 |
9f594791 | 2291 | void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
0400a6b0 | 2292 | { |
444f72fe TM |
2293 | struct nfs_client *clp = session->clp; |
2294 | ||
9f594791 TM |
2295 | switch (err) { |
2296 | default: | |
2297 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2298 | break; | |
2299 | case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: | |
2300 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2301 | } | |
d94cbf6c | 2302 | nfs4_schedule_state_manager(clp); |
0400a6b0 | 2303 | } |
cbdabc7f | 2304 | EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
0400a6b0 | 2305 | |
3f10a6af | 2306 | void nfs41_notify_server(struct nfs_client *clp) |
ac074835 TM |
2307 | { |
2308 | /* Use CHECK_LEASE to ping the server with a SEQUENCE */ | |
2309 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); | |
2310 | nfs4_schedule_state_manager(clp); | |
2311 | } | |
2312 | ||
0f79fd6f TM |
2313 | static void nfs4_reset_all_state(struct nfs_client *clp) |
2314 | { | |
2315 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2c820d9a | 2316 | set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
be0bfed0 | 2317 | clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
0f79fd6f | 2318 | nfs4_state_start_reclaim_nograce(clp); |
cc0a9843 TM |
2319 | dprintk("%s: scheduling reset of all state for server %s!\n", |
2320 | __func__, clp->cl_hostname); | |
0400a6b0 | 2321 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
2322 | } |
2323 | } | |
2324 | ||
2325 | static void nfs41_handle_server_reboot(struct nfs_client *clp) | |
2326 | { | |
2327 | if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { | |
2328 | nfs4_state_start_reclaim_reboot(clp); | |
cc0a9843 TM |
2329 | dprintk("%s: server %s rebooted!\n", __func__, |
2330 | clp->cl_hostname); | |
0400a6b0 | 2331 | nfs4_schedule_state_manager(clp); |
0f79fd6f TM |
2332 | } |
2333 | } | |
2334 | ||
8b895ce6 | 2335 | static void nfs41_handle_all_state_revoked(struct nfs_client *clp) |
0f79fd6f | 2336 | { |
0f79fd6f | 2337 | nfs4_reset_all_state(clp); |
cc0a9843 | 2338 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
0f79fd6f TM |
2339 | } |
2340 | ||
8b895ce6 TM |
2341 | static void nfs41_handle_some_state_revoked(struct nfs_client *clp) |
2342 | { | |
45870d69 | 2343 | nfs4_state_start_reclaim_nograce(clp); |
8b895ce6 TM |
2344 | nfs4_schedule_state_manager(clp); |
2345 | ||
2346 | dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); | |
2347 | } | |
2348 | ||
0f79fd6f TM |
2349 | static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) |
2350 | { | |
4099287f TM |
2351 | /* FIXME: For now, we destroy all layouts. */ |
2352 | pnfs_destroy_all_layouts(clp); | |
2353 | /* FIXME: For now, we test all delegations+open state+locks. */ | |
2354 | nfs41_handle_some_state_revoked(clp); | |
cc0a9843 TM |
2355 | dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
2356 | clp->cl_hostname); | |
0f79fd6f TM |
2357 | } |
2358 | ||
a9e64442 | 2359 | static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
0f79fd6f | 2360 | { |
b1352905 TM |
2361 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
2362 | nfs4_schedule_state_manager(clp); | |
2363 | ||
cc0a9843 TM |
2364 | dprintk("%s: server %s declared a backchannel fault\n", __func__, |
2365 | clp->cl_hostname); | |
0f79fd6f TM |
2366 | } |
2367 | ||
a9e64442 WAA |
2368 | static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
2369 | { | |
2370 | if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
2371 | &clp->cl_state) == 0) | |
2372 | nfs4_schedule_state_manager(clp); | |
2373 | } | |
2374 | ||
0a014a44 TM |
2375 | void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, |
2376 | bool recovery) | |
0629e370 AB |
2377 | { |
2378 | if (!flags) | |
2379 | return; | |
2c820d9a CL |
2380 | |
2381 | dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", | |
2382 | __func__, clp->cl_hostname, clp->cl_clientid, flags); | |
0a014a44 TM |
2383 | /* |
2384 | * If we're called from the state manager thread, then assume we're | |
2385 | * already handling the RECLAIM_NEEDED and/or STATE_REVOKED. | |
2386 | * Those flags are expected to remain set until we're done | |
2387 | * recovering (see RFC5661, section 18.46.3). | |
2388 | */ | |
2389 | if (recovery) | |
2390 | goto out_recovery; | |
2c820d9a | 2391 | |
111d489f | 2392 | if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
0f79fd6f | 2393 | nfs41_handle_server_reboot(clp); |
8b895ce6 TM |
2394 | if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED)) |
2395 | nfs41_handle_all_state_revoked(clp); | |
2396 | if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | | |
d1c2331e | 2397 | SEQ4_STATUS_ADMIN_STATE_REVOKED)) |
8b895ce6 | 2398 | nfs41_handle_some_state_revoked(clp); |
d1c2331e CL |
2399 | if (flags & SEQ4_STATUS_LEASE_MOVED) |
2400 | nfs4_schedule_lease_moved_recovery(clp); | |
111d489f | 2401 | if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
0f79fd6f | 2402 | nfs41_handle_recallable_state_revoked(clp); |
0a014a44 | 2403 | out_recovery: |
a9e64442 WAA |
2404 | if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
2405 | nfs41_handle_backchannel_fault(clp); | |
2406 | else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | | |
2407 | SEQ4_STATUS_CB_PATH_DOWN_SESSION)) | |
0f79fd6f | 2408 | nfs41_handle_cb_path_down(clp); |
0629e370 AB |
2409 | } |
2410 | ||
c3fad1b1 AA |
2411 | static int nfs4_reset_session(struct nfs_client *clp) |
2412 | { | |
a52458b4 | 2413 | const struct cred *cred; |
c3fad1b1 AA |
2414 | int status; |
2415 | ||
1a47e7a6 TM |
2416 | if (!nfs4_has_session(clp)) |
2417 | return 0; | |
8aafd2fd TM |
2418 | status = nfs4_begin_drain_session(clp); |
2419 | if (status != 0) | |
2420 | return status; | |
73d8bde5 | 2421 | cred = nfs4_get_clid_cred(clp); |
848f5bda | 2422 | status = nfs4_proc_destroy_session(clp->cl_session, cred); |
c489ee29 TM |
2423 | switch (status) { |
2424 | case 0: | |
2425 | case -NFS4ERR_BADSESSION: | |
2426 | case -NFS4ERR_DEADSESSION: | |
2427 | break; | |
2428 | case -NFS4ERR_BACK_CHAN_BUSY: | |
2429 | case -NFS4ERR_DELAY: | |
2430 | set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); | |
2431 | status = 0; | |
2432 | ssleep(1); | |
2433 | goto out; | |
2434 | default: | |
f455848a | 2435 | status = nfs4_recovery_handle_error(clp, status); |
c3fad1b1 AA |
2436 | goto out; |
2437 | } | |
2438 | ||
2439 | memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); | |
848f5bda | 2440 | status = nfs4_proc_create_session(clp, cred); |
41f54a55 | 2441 | if (status) { |
cc0a9843 TM |
2442 | dprintk("%s: session reset failed with status %d for server %s!\n", |
2443 | __func__, status, clp->cl_hostname); | |
f2c1b510 | 2444 | status = nfs4_handle_reclaim_lease_error(clp, status); |
41f54a55 AA |
2445 | goto out; |
2446 | } | |
bda197f5 | 2447 | nfs41_finish_session_reset(clp); |
cc0a9843 TM |
2448 | dprintk("%s: session reset was successful for server %s!\n", |
2449 | __func__, clp->cl_hostname); | |
41f54a55 | 2450 | out: |
a52458b4 | 2451 | put_cred(cred); |
c3fad1b1 AA |
2452 | return status; |
2453 | } | |
76db6d95 | 2454 | |
a9e64442 WAA |
2455 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
2456 | { | |
a52458b4 | 2457 | const struct cred *cred; |
2cf047c9 TM |
2458 | int ret; |
2459 | ||
1a47e7a6 TM |
2460 | if (!nfs4_has_session(clp)) |
2461 | return 0; | |
8aafd2fd TM |
2462 | ret = nfs4_begin_drain_session(clp); |
2463 | if (ret != 0) | |
2464 | return ret; | |
73d8bde5 | 2465 | cred = nfs4_get_clid_cred(clp); |
2cf047c9 | 2466 | ret = nfs4_proc_bind_conn_to_session(clp, cred); |
a52458b4 | 2467 | put_cred(cred); |
43ac544c | 2468 | clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
bf674c82 TM |
2469 | switch (ret) { |
2470 | case 0: | |
cc0a9843 TM |
2471 | dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
2472 | __func__, clp->cl_hostname); | |
bf674c82 TM |
2473 | break; |
2474 | case -NFS4ERR_DELAY: | |
2475 | ssleep(1); | |
2476 | set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); | |
2477 | break; | |
2478 | default: | |
2479 | return nfs4_recovery_handle_error(clp, ret); | |
2480 | } | |
2481 | return 0; | |
a9e64442 | 2482 | } |
76db6d95 | 2483 | #else /* CONFIG_NFS_V4_1 */ |
c3fad1b1 | 2484 | static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
a9e64442 WAA |
2485 | |
2486 | static int nfs4_bind_conn_to_session(struct nfs_client *clp) | |
2487 | { | |
2488 | return 0; | |
2489 | } | |
76db6d95 AA |
2490 | #endif /* CONFIG_NFS_V4_1 */ |
2491 | ||
e005e804 | 2492 | static void nfs4_state_manager(struct nfs_client *clp) |
02860014 | 2493 | { |
02860014 | 2494 | int status = 0; |
8ed27d4f | 2495 | const char *section = "", *section_sep = ""; |
02860014 | 2496 | |
02860014 | 2497 | /* Ensure exclusive access to NFSv4 state */ |
47c2199b | 2498 | do { |
aeabb3c9 | 2499 | clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
2c820d9a | 2500 | if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
8ed27d4f | 2501 | section = "purge state"; |
b42353ff | 2502 | status = nfs4_purge_lease(clp); |
2a6ee6aa TM |
2503 | if (status < 0) |
2504 | goto out_error; | |
b42353ff | 2505 | continue; |
2c820d9a CL |
2506 | } |
2507 | ||
b42353ff | 2508 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
8ed27d4f | 2509 | section = "lease expired"; |
b79a4a1b TM |
2510 | /* We're going to have to re-establish a clientid */ |
2511 | status = nfs4_reclaim_lease(clp); | |
2a6ee6aa | 2512 | if (status < 0) |
b79a4a1b | 2513 | goto out_error; |
b42353ff | 2514 | continue; |
e598d843 TM |
2515 | } |
2516 | ||
c3fad1b1 | 2517 | /* Initialize or reset the session */ |
1a47e7a6 | 2518 | if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
8ed27d4f | 2519 | section = "reset session"; |
4d643d1d | 2520 | status = nfs4_reset_session(clp); |
b6d408ba TM |
2521 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
2522 | continue; | |
2523 | if (status < 0) | |
76db6d95 | 2524 | goto out_error; |
76db6d95 | 2525 | } |
b6d408ba | 2526 | |
a9e64442 WAA |
2527 | /* Send BIND_CONN_TO_SESSION */ |
2528 | if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, | |
1a47e7a6 | 2529 | &clp->cl_state)) { |
8ed27d4f | 2530 | section = "bind conn to session"; |
a9e64442 WAA |
2531 | status = nfs4_bind_conn_to_session(clp); |
2532 | if (status < 0) | |
2533 | goto out_error; | |
bf674c82 | 2534 | continue; |
a9e64442 WAA |
2535 | } |
2536 | ||
5df904ae TM |
2537 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
2538 | section = "check lease"; | |
2539 | status = nfs4_check_lease(clp); | |
2540 | if (status < 0) | |
2541 | goto out_error; | |
8faaa6d5 | 2542 | continue; |
c9fdeb28 CL |
2543 | } |
2544 | ||
2545 | if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) { | |
2546 | section = "migration"; | |
2547 | status = nfs4_handle_migration(clp); | |
2548 | if (status < 0) | |
2549 | goto out_error; | |
5df904ae TM |
2550 | } |
2551 | ||
b7f7a66e CL |
2552 | if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) { |
2553 | section = "lease moved"; | |
2554 | status = nfs4_handle_lease_moved(clp); | |
2555 | if (status < 0) | |
2556 | goto out_error; | |
2557 | } | |
2558 | ||
b79a4a1b | 2559 | /* First recover reboot state... */ |
e345e88a | 2560 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
8ed27d4f | 2561 | section = "reclaim reboot"; |
591d71cb | 2562 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2563 | clp->cl_mvops->reboot_recovery_ops); |
df817ba3 | 2564 | if (status == -EAGAIN) |
b6d408ba TM |
2565 | continue; |
2566 | if (status < 0) | |
2567 | goto out_error; | |
df817ba3 | 2568 | nfs4_state_end_reclaim_reboot(clp); |
02860014 TM |
2569 | } |
2570 | ||
45870d69 TM |
2571 | /* Detect expired delegations... */ |
2572 | if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) { | |
2573 | section = "detect expired delegations"; | |
2574 | nfs_reap_expired_delegations(clp); | |
2575 | continue; | |
2576 | } | |
2577 | ||
b79a4a1b TM |
2578 | /* Now recover expired state... */ |
2579 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { | |
8ed27d4f | 2580 | section = "reclaim nograce"; |
591d71cb | 2581 | status = nfs4_do_reclaim(clp, |
c48f4f35 | 2582 | clp->cl_mvops->nograce_recovery_ops); |
df817ba3 | 2583 | if (status == -EAGAIN) |
b6d408ba TM |
2584 | continue; |
2585 | if (status < 0) | |
b79a4a1b | 2586 | goto out_error; |
1da177e4 | 2587 | } |
707fb4b3 | 2588 | |
5601a00d | 2589 | nfs4_end_drain_session(clp); |
aeabb3c9 TM |
2590 | nfs4_clear_state_manager_bit(clp); |
2591 | ||
2592 | if (!test_and_set_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state)) { | |
2593 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { | |
2594 | nfs_client_return_marked_delegations(clp); | |
2595 | set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); | |
2596 | } | |
2597 | clear_bit(NFS4CLNT_DELEGRETURN_RUNNING, &clp->cl_state); | |
707fb4b3 | 2598 | } |
e005e804 | 2599 | |
f3c76491 | 2600 | /* Did we race with an attempt to give us more work? */ |
aeabb3c9 | 2601 | if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state)) |
21a446cf | 2602 | return; |
f3c76491 | 2603 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
21a446cf | 2604 | return; |
a1aa09be | 2605 | } while (refcount_read(&clp->cl_count) > 1 && !signalled()); |
21a446cf TM |
2606 | goto out_drain; |
2607 | ||
1da177e4 | 2608 | out_error: |
8ed27d4f WAA |
2609 | if (strlen(section)) |
2610 | section_sep = ": "; | |
2611 | pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" | |
2612 | " with error %d\n", section_sep, section, | |
2613 | clp->cl_hostname, -status); | |
ffe5a830 | 2614 | ssleep(1); |
21a446cf | 2615 | out_drain: |
5601a00d | 2616 | nfs4_end_drain_session(clp); |
e005e804 TM |
2617 | nfs4_clear_state_manager_bit(clp); |
2618 | } | |
2619 | ||
2620 | static int nfs4_run_state_manager(void *ptr) | |
2621 | { | |
2622 | struct nfs_client *clp = ptr; | |
2623 | ||
2624 | allow_signal(SIGKILL); | |
2625 | nfs4_state_manager(clp); | |
2626 | nfs_put_client(clp); | |
2627 | module_put_and_exit(0); | |
2628 | return 0; | |
1da177e4 LT |
2629 | } |
2630 | ||
2631 | /* | |
2632 | * Local variables: | |
2633 | * c-basic-offset: 8 | |
2634 | * End: | |
2635 | */ |