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[PATCH] tlclk: delete unnecessary sysfs_remove_group
[wandboard.git] / fs / nfsd / nfs4callback.c
blobf57655a7a2b66b9ae1b1567e9d5500b581a5c9ae
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/sunrpc/xdr.h>
42 #include <linux/sunrpc/svc.h>
43 #include <linux/sunrpc/clnt.h>
44 #include <linux/nfsd/nfsd.h>
45 #include <linux/nfsd/state.h>
46 #include <linux/sunrpc/sched.h>
47 #include <linux/nfs4.h>
48
49 #define NFSDDBG_FACILITY NFSDDBG_PROC
50
51 #define NFSPROC4_CB_NULL 0
52 #define NFSPROC4_CB_COMPOUND 1
53
54 /* declarations */
55 static const struct rpc_call_ops nfs4_cb_null_ops;
56
57 /* Index of predefined Linux callback client operations */
58
59 enum {
60 NFSPROC4_CLNT_CB_NULL = 0,
61 NFSPROC4_CLNT_CB_RECALL,
62 };
63
64 enum nfs_cb_opnum4 {
65 OP_CB_RECALL = 4,
66 };
67
68 #define NFS4_MAXTAGLEN 20
69
70 #define NFS4_enc_cb_null_sz 0
71 #define NFS4_dec_cb_null_sz 0
72 #define cb_compound_enc_hdr_sz 4
73 #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
74 #define op_enc_sz 1
75 #define op_dec_sz 2
76 #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
77 #define enc_stateid_sz 16
78 #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
79 1 + enc_stateid_sz + \
80 enc_nfs4_fh_sz)
81
82 #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
83 op_dec_sz)
84
85 /*
86 * Generic encode routines from fs/nfs/nfs4xdr.c
87 */
88 static inline __be32 *
89 xdr_writemem(__be32 *p, const void *ptr, int nbytes)
90 {
91 int tmp = XDR_QUADLEN(nbytes);
92 if (!tmp)
93 return p;
94 p[tmp-1] = 0;
95 memcpy(p, ptr, nbytes);
96 return p + tmp;
97 }
98
99 #define WRITE32(n) *p++ = htonl(n)
100 #define WRITEMEM(ptr,nbytes) do { \
101 p = xdr_writemem(p, ptr, nbytes); \
102 } while (0)
103 #define RESERVE_SPACE(nbytes) do { \
104 p = xdr_reserve_space(xdr, nbytes); \
105 if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
106 BUG_ON(!p); \
107 } while (0)
108
109 /*
110 * Generic decode routines from fs/nfs/nfs4xdr.c
111 */
112 #define DECODE_TAIL \
113 status = 0; \
114 out: \
115 return status; \
116 xdr_error: \
117 dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
118 status = -EIO; \
119 goto out
120
121 #define READ32(x) (x) = ntohl(*p++)
122 #define READ64(x) do { \
123 (x) = (u64)ntohl(*p++) << 32; \
124 (x) |= ntohl(*p++); \
125 } while (0)
126 #define READTIME(x) do { \
127 p++; \
128 (x.tv_sec) = ntohl(*p++); \
129 (x.tv_nsec) = ntohl(*p++); \
130 } while (0)
131 #define READ_BUF(nbytes) do { \
132 p = xdr_inline_decode(xdr, nbytes); \
133 if (!p) { \
134 dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
135 __FUNCTION__, __LINE__); \
136 return -EIO; \
137 } \
138 } while (0)
139
140 struct nfs4_cb_compound_hdr {
141 int status;
142 u32 ident;
143 u32 nops;
144 u32 taglen;
145 char * tag;
146 };
147
148 static struct {
149 int stat;
150 int errno;
151 } nfs_cb_errtbl[] = {
152 { NFS4_OK, 0 },
153 { NFS4ERR_PERM, EPERM },
154 { NFS4ERR_NOENT, ENOENT },
155 { NFS4ERR_IO, EIO },
156 { NFS4ERR_NXIO, ENXIO },
157 { NFS4ERR_ACCESS, EACCES },
158 { NFS4ERR_EXIST, EEXIST },
159 { NFS4ERR_XDEV, EXDEV },
160 { NFS4ERR_NOTDIR, ENOTDIR },
161 { NFS4ERR_ISDIR, EISDIR },
162 { NFS4ERR_INVAL, EINVAL },
163 { NFS4ERR_FBIG, EFBIG },
164 { NFS4ERR_NOSPC, ENOSPC },
165 { NFS4ERR_ROFS, EROFS },
166 { NFS4ERR_MLINK, EMLINK },
167 { NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
168 { NFS4ERR_NOTEMPTY, ENOTEMPTY },
169 { NFS4ERR_DQUOT, EDQUOT },
170 { NFS4ERR_STALE, ESTALE },
171 { NFS4ERR_BADHANDLE, EBADHANDLE },
172 { NFS4ERR_BAD_COOKIE, EBADCOOKIE },
173 { NFS4ERR_NOTSUPP, ENOTSUPP },
174 { NFS4ERR_TOOSMALL, ETOOSMALL },
175 { NFS4ERR_SERVERFAULT, ESERVERFAULT },
176 { NFS4ERR_BADTYPE, EBADTYPE },
177 { NFS4ERR_LOCKED, EAGAIN },
178 { NFS4ERR_RESOURCE, EREMOTEIO },
179 { NFS4ERR_SYMLINK, ELOOP },
180 { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
181 { NFS4ERR_DEADLOCK, EDEADLK },
182 { -1, EIO }
183 };
184
185 static int
186 nfs_cb_stat_to_errno(int stat)
187 {
188 int i;
189 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
190 if (nfs_cb_errtbl[i].stat == stat)
191 return nfs_cb_errtbl[i].errno;
192 }
193 /* If we cannot translate the error, the recovery routines should
194 * handle it.
195 * Note: remaining NFSv4 error codes have values > 10000, so should
196 * not conflict with native Linux error codes.
197 */
198 return stat;
199 }
200
201 /*
202 * XDR encode
203 */
204
205 static int
206 encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
207 {
208 __be32 * p;
209
210 RESERVE_SPACE(16);
211 WRITE32(0); /* tag length is always 0 */
212 WRITE32(NFS4_MINOR_VERSION);
213 WRITE32(hdr->ident);
214 WRITE32(hdr->nops);
215 return 0;
216 }
217
218 static int
219 encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
220 {
221 __be32 *p;
222 int len = cb_rec->cbr_fhlen;
223
224 RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
225 WRITE32(OP_CB_RECALL);
226 WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t));
227 WRITE32(cb_rec->cbr_trunc);
228 WRITE32(len);
229 WRITEMEM(cb_rec->cbr_fhval, len);
230 return 0;
231 }
232
233 static int
234 nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
235 {
236 struct xdr_stream xdrs, *xdr = &xdrs;
237
238 xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
239 RESERVE_SPACE(0);
240 return 0;
241 }
242
243 static int
244 nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
245 {
246 struct xdr_stream xdr;
247 struct nfs4_cb_compound_hdr hdr = {
248 .ident = args->cbr_ident,
249 .nops = 1,
250 };
251
252 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
253 encode_cb_compound_hdr(&xdr, &hdr);
254 return (encode_cb_recall(&xdr, args));
255 }
256
257
258 static int
259 decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
260 __be32 *p;
261
262 READ_BUF(8);
263 READ32(hdr->status);
264 READ32(hdr->taglen);
265 READ_BUF(hdr->taglen + 4);
266 hdr->tag = (char *)p;
267 p += XDR_QUADLEN(hdr->taglen);
268 READ32(hdr->nops);
269 return 0;
270 }
271
272 static int
273 decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
274 {
275 __be32 *p;
276 u32 op;
277 int32_t nfserr;
278
279 READ_BUF(8);
280 READ32(op);
281 if (op != expected) {
282 dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
283 " operation %d but we issued a request for %d\n",
284 op, expected);
285 return -EIO;
286 }
287 READ32(nfserr);
288 if (nfserr != NFS_OK)
289 return -nfs_cb_stat_to_errno(nfserr);
290 return 0;
291 }
292
293 static int
294 nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
295 {
296 return 0;
297 }
298
299 static int
300 nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
301 {
302 struct xdr_stream xdr;
303 struct nfs4_cb_compound_hdr hdr;
304 int status;
305
306 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
307 status = decode_cb_compound_hdr(&xdr, &hdr);
308 if (status)
309 goto out;
310 status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
311 out:
312 return status;
313 }
314
315 /*
316 * RPC procedure tables
317 */
318 #ifndef MAX
319 # define MAX(a, b) (((a) > (b))? (a) : (b))
320 #endif
321
322 #define PROC(proc, call, argtype, restype) \
323 [NFSPROC4_CLNT_##proc] = { \
324 .p_proc = NFSPROC4_CB_##call, \
325 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
326 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
327 .p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2, \
328 .p_statidx = NFSPROC4_CB_##call, \
329 .p_name = #proc, \
330 }
331
332 static struct rpc_procinfo nfs4_cb_procedures[] = {
333 PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
334 PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
335 };
336
337 static struct rpc_version nfs_cb_version4 = {
338 .number = 1,
339 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
340 .procs = nfs4_cb_procedures
341 };
342
343 static struct rpc_version * nfs_cb_version[] = {
344 NULL,
345 &nfs_cb_version4,
346 };
347
348 /*
349 * Use the SETCLIENTID credential
350 */
351 static struct rpc_cred *
352 nfsd4_lookupcred(struct nfs4_client *clp, int taskflags)
353 {
354 struct auth_cred acred;
355 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
356 struct rpc_cred *ret;
357
358 get_group_info(clp->cl_cred.cr_group_info);
359 acred.uid = clp->cl_cred.cr_uid;
360 acred.gid = clp->cl_cred.cr_gid;
361 acred.group_info = clp->cl_cred.cr_group_info;
362
363 dprintk("NFSD: looking up %s cred\n",
364 clnt->cl_auth->au_ops->au_name);
365 ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags);
366 put_group_info(clp->cl_cred.cr_group_info);
367 return ret;
368 }
369
370 /*
371 * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
372 */
373 void
374 nfsd4_probe_callback(struct nfs4_client *clp)
375 {
376 struct sockaddr_in addr;
377 struct nfs4_callback *cb = &clp->cl_callback;
378 struct rpc_timeout timeparms = {
379 .to_initval = (NFSD_LEASE_TIME/4) * HZ,
380 .to_retries = 5,
381 .to_maxval = (NFSD_LEASE_TIME/2) * HZ,
382 .to_exponential = 1,
383 };
384 struct rpc_program * program = &cb->cb_program;
385 struct rpc_create_args args = {
386 .protocol = IPPROTO_TCP,
387 .address = (struct sockaddr *)&addr,
388 .addrsize = sizeof(addr),
389 .timeout = &timeparms,
390 .servername = clp->cl_name.data,
391 .program = program,
392 .version = nfs_cb_version[1]->number,
393 .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */
394 .flags = (RPC_CLNT_CREATE_NOPING),
395 };
396 struct rpc_message msg = {
397 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
398 .rpc_argp = clp,
399 };
400 int status;
401
402 if (atomic_read(&cb->cb_set))
403 return;
404
405 /* Initialize address */
406 memset(&addr, 0, sizeof(addr));
407 addr.sin_family = AF_INET;
408 addr.sin_port = htons(cb->cb_port);
409 addr.sin_addr.s_addr = htonl(cb->cb_addr);
410
411 /* Initialize rpc_program */
412 program->name = "nfs4_cb";
413 program->number = cb->cb_prog;
414 program->nrvers = ARRAY_SIZE(nfs_cb_version);
415 program->version = nfs_cb_version;
416 program->stats = &cb->cb_stat;
417
418 /* Initialize rpc_stat */
419 memset(program->stats, 0, sizeof(cb->cb_stat));
420 program->stats->program = program;
421
422 /* Create RPC client */
423 cb->cb_client = rpc_create(&args);
424 if (IS_ERR(cb->cb_client)) {
425 dprintk("NFSD: couldn't create callback client\n");
426 goto out_err;
427 }
428
429 /* Kick rpciod, put the call on the wire. */
430 if (rpciod_up() != 0)
431 goto out_clnt;
432
433 /* the task holds a reference to the nfs4_client struct */
434 atomic_inc(&clp->cl_count);
435
436 msg.rpc_cred = nfsd4_lookupcred(clp,0);
437 if (IS_ERR(msg.rpc_cred))
438 goto out_rpciod;
439 status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL);
440 put_rpccred(msg.rpc_cred);
441
442 if (status != 0) {
443 dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n");
444 goto out_rpciod;
445 }
446 return;
447
448 out_rpciod:
449 atomic_dec(&clp->cl_count);
450 rpciod_down();
451 out_clnt:
452 rpc_shutdown_client(cb->cb_client);
453 out_err:
454 cb->cb_client = NULL;
455 dprintk("NFSD: warning: no callback path to client %.*s\n",
456 (int)clp->cl_name.len, clp->cl_name.data);
457 }
458
459 static void
460 nfs4_cb_null(struct rpc_task *task, void *dummy)
461 {
462 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
463 struct nfs4_callback *cb = &clp->cl_callback;
464 __be32 addr = htonl(cb->cb_addr);
465
466 dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status);
467
468 if (task->tk_status < 0) {
469 dprintk("NFSD: callback establishment to client %.*s failed\n",
470 (int)clp->cl_name.len, clp->cl_name.data);
471 goto out;
472 }
473 atomic_set(&cb->cb_set, 1);
474 dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr));
475 out:
476 put_nfs4_client(clp);
477 }
478
479 static const struct rpc_call_ops nfs4_cb_null_ops = {
480 .rpc_call_done = nfs4_cb_null,
481 };
482
483 /*
484 * called with dp->dl_count inc'ed.
485 * nfs4_lock_state() may or may not have been called.
486 */
487 void
488 nfsd4_cb_recall(struct nfs4_delegation *dp)
489 {
490 struct nfs4_client *clp = dp->dl_client;
491 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
492 struct nfs4_cb_recall *cbr = &dp->dl_recall;
493 struct rpc_message msg = {
494 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
495 .rpc_argp = cbr,
496 };
497 int retries = 1;
498 int status = 0;
499
500 if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
501 return;
502
503 msg.rpc_cred = nfsd4_lookupcred(clp, 0);
504 if (IS_ERR(msg.rpc_cred))
505 goto out;
506
507 cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
508 cbr->cbr_dp = dp;
509
510 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
511 while (retries--) {
512 switch (status) {
513 case -EIO:
514 /* Network partition? */
515 case -EBADHANDLE:
516 case -NFS4ERR_BAD_STATEID:
517 /* Race: client probably got cb_recall
518 * before open reply granting delegation */
519 break;
520 default:
521 goto out_put_cred;
522 }
523 ssleep(2);
524 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
525 }
526 out_put_cred:
527 put_rpccred(msg.rpc_cred);
528 out:
529 if (status == -EIO)
530 atomic_set(&clp->cl_callback.cb_set, 0);
531 /* Success or failure, now we're either waiting for lease expiration
532 * or deleg_return. */
533 dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
534 nfs4_put_delegation(dp);
535 return;
536 }
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