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drm/radeon: fix radeon kms framebuffer device
[linux-2.6/x86.git] / fs / nfsd / nfs4callback.c
blob3fd23f7acecaf7473d10a026db0490b7d1ad39b5
1 /*
2 * linux/fs/nfsd/nfs4callback.c
3 *
4 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <linux/module.h>
37 #include <linux/list.h>
38 #include <linux/inet.h>
39 #include <linux/errno.h>
40 #include <linux/delay.h>
41 #include <linux/sched.h>
42 #include <linux/kthread.h>
43 #include <linux/sunrpc/xdr.h>
44 #include <linux/sunrpc/svc.h>
45 #include <linux/sunrpc/clnt.h>
46 #include <linux/nfsd/nfsd.h>
47 #include <linux/nfsd/state.h>
48 #include <linux/sunrpc/sched.h>
49 #include <linux/nfs4.h>
50
51 #define NFSDDBG_FACILITY NFSDDBG_PROC
52
53 #define NFSPROC4_CB_NULL 0
54 #define NFSPROC4_CB_COMPOUND 1
55
56 /* Index of predefined Linux callback client operations */
57
58 enum {
59 NFSPROC4_CLNT_CB_NULL = 0,
60 NFSPROC4_CLNT_CB_RECALL,
61 };
62
63 enum nfs_cb_opnum4 {
64 OP_CB_RECALL = 4,
65 };
66
67 #define NFS4_MAXTAGLEN 20
68
69 #define NFS4_enc_cb_null_sz 0
70 #define NFS4_dec_cb_null_sz 0
71 #define cb_compound_enc_hdr_sz 4
72 #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
73 #define op_enc_sz 1
74 #define op_dec_sz 2
75 #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
76 #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
77 #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
78 1 + enc_stateid_sz + \
79 enc_nfs4_fh_sz)
80
81 #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
82 op_dec_sz)
83
84 /*
85 * Generic encode routines from fs/nfs/nfs4xdr.c
86 */
87 static inline __be32 *
88 xdr_writemem(__be32 *p, const void *ptr, int nbytes)
89 {
90 int tmp = XDR_QUADLEN(nbytes);
91 if (!tmp)
92 return p;
93 p[tmp-1] = 0;
94 memcpy(p, ptr, nbytes);
95 return p + tmp;
96 }
97
98 #define WRITE32(n) *p++ = htonl(n)
99 #define WRITEMEM(ptr,nbytes) do { \
100 p = xdr_writemem(p, ptr, nbytes); \
101 } while (0)
102 #define RESERVE_SPACE(nbytes) do { \
103 p = xdr_reserve_space(xdr, nbytes); \
104 if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
105 BUG_ON(!p); \
106 } while (0)
107
108 /*
109 * Generic decode routines from fs/nfs/nfs4xdr.c
110 */
111 #define DECODE_TAIL \
112 status = 0; \
113 out: \
114 return status; \
115 xdr_error: \
116 dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
117 status = -EIO; \
118 goto out
119
120 #define READ32(x) (x) = ntohl(*p++)
121 #define READ64(x) do { \
122 (x) = (u64)ntohl(*p++) << 32; \
123 (x) |= ntohl(*p++); \
124 } while (0)
125 #define READTIME(x) do { \
126 p++; \
127 (x.tv_sec) = ntohl(*p++); \
128 (x.tv_nsec) = ntohl(*p++); \
129 } while (0)
130 #define READ_BUF(nbytes) do { \
131 p = xdr_inline_decode(xdr, nbytes); \
132 if (!p) { \
133 dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
134 __func__, __LINE__); \
135 return -EIO; \
136 } \
137 } while (0)
138
139 struct nfs4_cb_compound_hdr {
140 int status;
141 u32 ident;
142 u32 nops;
143 __be32 *nops_p;
144 u32 minorversion;
145 u32 taglen;
146 char *tag;
147 };
148
149 static struct {
150 int stat;
151 int errno;
152 } nfs_cb_errtbl[] = {
153 { NFS4_OK, 0 },
154 { NFS4ERR_PERM, EPERM },
155 { NFS4ERR_NOENT, ENOENT },
156 { NFS4ERR_IO, EIO },
157 { NFS4ERR_NXIO, ENXIO },
158 { NFS4ERR_ACCESS, EACCES },
159 { NFS4ERR_EXIST, EEXIST },
160 { NFS4ERR_XDEV, EXDEV },
161 { NFS4ERR_NOTDIR, ENOTDIR },
162 { NFS4ERR_ISDIR, EISDIR },
163 { NFS4ERR_INVAL, EINVAL },
164 { NFS4ERR_FBIG, EFBIG },
165 { NFS4ERR_NOSPC, ENOSPC },
166 { NFS4ERR_ROFS, EROFS },
167 { NFS4ERR_MLINK, EMLINK },
168 { NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
169 { NFS4ERR_NOTEMPTY, ENOTEMPTY },
170 { NFS4ERR_DQUOT, EDQUOT },
171 { NFS4ERR_STALE, ESTALE },
172 { NFS4ERR_BADHANDLE, EBADHANDLE },
173 { NFS4ERR_BAD_COOKIE, EBADCOOKIE },
174 { NFS4ERR_NOTSUPP, ENOTSUPP },
175 { NFS4ERR_TOOSMALL, ETOOSMALL },
176 { NFS4ERR_SERVERFAULT, ESERVERFAULT },
177 { NFS4ERR_BADTYPE, EBADTYPE },
178 { NFS4ERR_LOCKED, EAGAIN },
179 { NFS4ERR_RESOURCE, EREMOTEIO },
180 { NFS4ERR_SYMLINK, ELOOP },
181 { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
182 { NFS4ERR_DEADLOCK, EDEADLK },
183 { -1, EIO }
184 };
185
186 static int
187 nfs_cb_stat_to_errno(int stat)
188 {
189 int i;
190 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
191 if (nfs_cb_errtbl[i].stat == stat)
192 return nfs_cb_errtbl[i].errno;
193 }
194 /* If we cannot translate the error, the recovery routines should
195 * handle it.
196 * Note: remaining NFSv4 error codes have values > 10000, so should
197 * not conflict with native Linux error codes.
198 */
199 return stat;
200 }
201
202 /*
203 * XDR encode
204 */
205
206 static void
207 encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
208 {
209 __be32 * p;
210
211 RESERVE_SPACE(16);
212 WRITE32(0); /* tag length is always 0 */
213 WRITE32(hdr->minorversion);
214 WRITE32(hdr->ident);
215 hdr->nops_p = p;
216 WRITE32(hdr->nops);
217 }
218
219 static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
220 {
221 *hdr->nops_p = htonl(hdr->nops);
222 }
223
224 static void
225 encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp,
226 struct nfs4_cb_compound_hdr *hdr)
227 {
228 __be32 *p;
229 int len = dp->dl_fh.fh_size;
230
231 RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len);
232 WRITE32(OP_CB_RECALL);
233 WRITE32(dp->dl_stateid.si_generation);
234 WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t));
235 WRITE32(0); /* truncate optimization not implemented */
236 WRITE32(len);
237 WRITEMEM(&dp->dl_fh.fh_base, len);
238 hdr->nops++;
239 }
240
241 static int
242 nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
243 {
244 struct xdr_stream xdrs, *xdr = &xdrs;
245
246 xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
247 RESERVE_SPACE(0);
248 return 0;
249 }
250
251 static int
252 nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args)
253 {
254 struct xdr_stream xdr;
255 struct nfs4_cb_compound_hdr hdr = {
256 .ident = args->dl_ident,
257 };
258
259 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
260 encode_cb_compound_hdr(&xdr, &hdr);
261 encode_cb_recall(&xdr, args, &hdr);
262 encode_cb_nops(&hdr);
263 return 0;
264 }
265
266
267 static int
268 decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
269 __be32 *p;
270
271 READ_BUF(8);
272 READ32(hdr->status);
273 READ32(hdr->taglen);
274 READ_BUF(hdr->taglen + 4);
275 hdr->tag = (char *)p;
276 p += XDR_QUADLEN(hdr->taglen);
277 READ32(hdr->nops);
278 return 0;
279 }
280
281 static int
282 decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
283 {
284 __be32 *p;
285 u32 op;
286 int32_t nfserr;
287
288 READ_BUF(8);
289 READ32(op);
290 if (op != expected) {
291 dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
292 " operation %d but we issued a request for %d\n",
293 op, expected);
294 return -EIO;
295 }
296 READ32(nfserr);
297 if (nfserr != NFS_OK)
298 return -nfs_cb_stat_to_errno(nfserr);
299 return 0;
300 }
301
302 static int
303 nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
304 {
305 return 0;
306 }
307
308 static int
309 nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
310 {
311 struct xdr_stream xdr;
312 struct nfs4_cb_compound_hdr hdr;
313 int status;
314
315 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
316 status = decode_cb_compound_hdr(&xdr, &hdr);
317 if (status)
318 goto out;
319 status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
320 out:
321 return status;
322 }
323
324 /*
325 * RPC procedure tables
326 */
327 #define PROC(proc, call, argtype, restype) \
328 [NFSPROC4_CLNT_##proc] = { \
329 .p_proc = NFSPROC4_CB_##call, \
330 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
331 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
332 .p_arglen = NFS4_##argtype##_sz, \
333 .p_replen = NFS4_##restype##_sz, \
334 .p_statidx = NFSPROC4_CB_##call, \
335 .p_name = #proc, \
336 }
337
338 static struct rpc_procinfo nfs4_cb_procedures[] = {
339 PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
340 PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
341 };
342
343 static struct rpc_version nfs_cb_version4 = {
344 .number = 1,
345 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
346 .procs = nfs4_cb_procedures
347 };
348
349 static struct rpc_version * nfs_cb_version[] = {
350 NULL,
351 &nfs_cb_version4,
352 };
353
354 static struct rpc_program cb_program;
355
356 static struct rpc_stat cb_stats = {
357 .program = &cb_program
358 };
359
360 #define NFS4_CALLBACK 0x40000000
361 static struct rpc_program cb_program = {
362 .name = "nfs4_cb",
363 .number = NFS4_CALLBACK,
364 .nrvers = ARRAY_SIZE(nfs_cb_version),
365 .version = nfs_cb_version,
366 .stats = &cb_stats,
367 .pipe_dir_name = "/nfsd4_cb",
368 };
369
370 static int max_cb_time(void)
371 {
372 return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ;
373 }
374
375 /* Reference counting, callback cleanup, etc., all look racy as heck.
376 * And why is cb_set an atomic? */
377
378 int setup_callback_client(struct nfs4_client *clp)
379 {
380 struct sockaddr_in addr;
381 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
382 struct rpc_timeout timeparms = {
383 .to_initval = max_cb_time(),
384 .to_retries = 0,
385 };
386 struct rpc_create_args args = {
387 .protocol = IPPROTO_TCP,
388 .address = (struct sockaddr *)&addr,
389 .addrsize = sizeof(addr),
390 .timeout = &timeparms,
391 .program = &cb_program,
392 .prognumber = cb->cb_prog,
393 .version = nfs_cb_version[1]->number,
394 .authflavor = clp->cl_flavor,
395 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
396 .client_name = clp->cl_principal,
397 };
398 struct rpc_clnt *client;
399
400 if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
401 return -EINVAL;
402
403 /* Initialize address */
404 memset(&addr, 0, sizeof(addr));
405 addr.sin_family = AF_INET;
406 addr.sin_port = htons(cb->cb_port);
407 addr.sin_addr.s_addr = htonl(cb->cb_addr);
408
409 /* Create RPC client */
410 client = rpc_create(&args);
411 if (IS_ERR(client)) {
412 dprintk("NFSD: couldn't create callback client: %ld\n",
413 PTR_ERR(client));
414 return PTR_ERR(client);
415 }
416 cb->cb_client = client;
417 return 0;
418
419 }
420
421 static void warn_no_callback_path(struct nfs4_client *clp, int reason)
422 {
423 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
424 (int)clp->cl_name.len, clp->cl_name.data, reason);
425 }
426
427 static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
428 {
429 struct nfs4_client *clp = calldata;
430
431 if (task->tk_status)
432 warn_no_callback_path(clp, task->tk_status);
433 else
434 atomic_set(&clp->cl_cb_conn.cb_set, 1);
435 put_nfs4_client(clp);
436 }
437
438 static const struct rpc_call_ops nfsd4_cb_probe_ops = {
439 .rpc_call_done = nfsd4_cb_probe_done,
440 };
441
442 static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb)
443 {
444 struct auth_cred acred = {
445 .machine_cred = 1
446 };
447
448 /*
449 * Note in the gss case this doesn't actually have to wait for a
450 * gss upcall (or any calls to the client); this just creates a
451 * non-uptodate cred which the rpc state machine will fill in with
452 * a refresh_upcall later.
453 */
454 return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred,
455 RPCAUTH_LOOKUP_NEW);
456 }
457
458 void do_probe_callback(struct nfs4_client *clp)
459 {
460 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
461 struct rpc_message msg = {
462 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
463 .rpc_argp = clp,
464 };
465 struct rpc_cred *cred;
466 int status;
467
468 cred = lookup_cb_cred(cb);
469 if (IS_ERR(cred)) {
470 status = PTR_ERR(cred);
471 goto out;
472 }
473 cb->cb_cred = cred;
474 msg.rpc_cred = cb->cb_cred;
475 status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT,
476 &nfsd4_cb_probe_ops, (void *)clp);
477 out:
478 if (status) {
479 warn_no_callback_path(clp, status);
480 put_nfs4_client(clp);
481 }
482 }
483
484 /*
485 * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
486 */
487 void
488 nfsd4_probe_callback(struct nfs4_client *clp)
489 {
490 int status;
491
492 BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set));
493
494 status = setup_callback_client(clp);
495 if (status) {
496 warn_no_callback_path(clp, status);
497 return;
498 }
499
500 /* the task holds a reference to the nfs4_client struct */
501 atomic_inc(&clp->cl_count);
502
503 do_probe_callback(clp);
504 }
505
506 static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
507 {
508 struct nfs4_delegation *dp = calldata;
509 struct nfs4_client *clp = dp->dl_client;
510
511 switch (task->tk_status) {
512 case -EIO:
513 /* Network partition? */
514 atomic_set(&clp->cl_cb_conn.cb_set, 0);
515 warn_no_callback_path(clp, task->tk_status);
516 case -EBADHANDLE:
517 case -NFS4ERR_BAD_STATEID:
518 /* Race: client probably got cb_recall
519 * before open reply granting delegation */
520 break;
521 default:
522 /* success, or error we can't handle */
523 return;
524 }
525 if (dp->dl_retries--) {
526 rpc_delay(task, 2*HZ);
527 task->tk_status = 0;
528 rpc_restart_call(task);
529 } else {
530 atomic_set(&clp->cl_cb_conn.cb_set, 0);
531 warn_no_callback_path(clp, task->tk_status);
532 }
533 }
534
535 static void nfsd4_cb_recall_release(void *calldata)
536 {
537 struct nfs4_delegation *dp = calldata;
538 struct nfs4_client *clp = dp->dl_client;
539
540 nfs4_put_delegation(dp);
541 put_nfs4_client(clp);
542 }
543
544 static const struct rpc_call_ops nfsd4_cb_recall_ops = {
545 .rpc_call_done = nfsd4_cb_recall_done,
546 .rpc_release = nfsd4_cb_recall_release,
547 };
548
549 /*
550 * called with dp->dl_count inc'ed.
551 */
552 void
553 nfsd4_cb_recall(struct nfs4_delegation *dp)
554 {
555 struct nfs4_client *clp = dp->dl_client;
556 struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
557 struct rpc_message msg = {
558 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
559 .rpc_argp = dp,
560 .rpc_cred = clp->cl_cb_conn.cb_cred
561 };
562 int status;
563
564 dp->dl_retries = 1;
565 status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT,
566 &nfsd4_cb_recall_ops, dp);
567 if (status) {
568 put_nfs4_client(clp);
569 nfs4_put_delegation(dp);
570 }
571 }
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