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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
e8edc6e0 | 41 | #include <linux/sched.h> |
2b47eece | 42 | #include <linux/kthread.h> |
1da177e4 LT |
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 | /* declarations */ | |
963d8fe5 | 57 | static const struct rpc_call_ops nfs4_cb_null_ops; |
1da177e4 LT |
58 | |
59 | /* Index of predefined Linux callback client operations */ | |
60 | ||
61 | enum { | |
62 | NFSPROC4_CLNT_CB_NULL = 0, | |
63 | NFSPROC4_CLNT_CB_RECALL, | |
64 | }; | |
65 | ||
66 | enum nfs_cb_opnum4 { | |
67 | OP_CB_RECALL = 4, | |
68 | }; | |
69 | ||
70 | #define NFS4_MAXTAGLEN 20 | |
71 | ||
72 | #define NFS4_enc_cb_null_sz 0 | |
73 | #define NFS4_dec_cb_null_sz 0 | |
74 | #define cb_compound_enc_hdr_sz 4 | |
75 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
76 | #define op_enc_sz 1 | |
77 | #define op_dec_sz 2 | |
78 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 79 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 LT |
80 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
81 | 1 + enc_stateid_sz + \ | |
82 | enc_nfs4_fh_sz) | |
83 | ||
84 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
85 | op_dec_sz) | |
86 | ||
87 | /* | |
88 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
89 | */ | |
f00f328f AV |
90 | static inline __be32 * |
91 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
92 | { |
93 | int tmp = XDR_QUADLEN(nbytes); | |
94 | if (!tmp) | |
95 | return p; | |
96 | p[tmp-1] = 0; | |
97 | memcpy(p, ptr, nbytes); | |
98 | return p + tmp; | |
99 | } | |
100 | ||
101 | #define WRITE32(n) *p++ = htonl(n) | |
102 | #define WRITEMEM(ptr,nbytes) do { \ | |
103 | p = xdr_writemem(p, ptr, nbytes); \ | |
104 | } while (0) | |
105 | #define RESERVE_SPACE(nbytes) do { \ | |
106 | p = xdr_reserve_space(xdr, nbytes); \ | |
107 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \ | |
108 | BUG_ON(!p); \ | |
109 | } while (0) | |
110 | ||
111 | /* | |
112 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
113 | */ | |
114 | #define DECODE_TAIL \ | |
115 | status = 0; \ | |
116 | out: \ | |
117 | return status; \ | |
118 | xdr_error: \ | |
119 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
120 | status = -EIO; \ | |
121 | goto out | |
122 | ||
123 | #define READ32(x) (x) = ntohl(*p++) | |
124 | #define READ64(x) do { \ | |
125 | (x) = (u64)ntohl(*p++) << 32; \ | |
126 | (x) |= ntohl(*p++); \ | |
127 | } while (0) | |
128 | #define READTIME(x) do { \ | |
129 | p++; \ | |
130 | (x.tv_sec) = ntohl(*p++); \ | |
131 | (x.tv_nsec) = ntohl(*p++); \ | |
132 | } while (0) | |
133 | #define READ_BUF(nbytes) do { \ | |
134 | p = xdr_inline_decode(xdr, nbytes); \ | |
135 | if (!p) { \ | |
3e3b4800 | 136 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
1da177e4 LT |
137 | __FUNCTION__, __LINE__); \ |
138 | return -EIO; \ | |
139 | } \ | |
140 | } while (0) | |
141 | ||
142 | struct nfs4_cb_compound_hdr { | |
143 | int status; | |
144 | u32 ident; | |
145 | u32 nops; | |
146 | u32 taglen; | |
147 | char * tag; | |
148 | }; | |
149 | ||
150 | static struct { | |
151 | int stat; | |
152 | int errno; | |
153 | } nfs_cb_errtbl[] = { | |
154 | { NFS4_OK, 0 }, | |
155 | { NFS4ERR_PERM, EPERM }, | |
156 | { NFS4ERR_NOENT, ENOENT }, | |
157 | { NFS4ERR_IO, EIO }, | |
158 | { NFS4ERR_NXIO, ENXIO }, | |
159 | { NFS4ERR_ACCESS, EACCES }, | |
160 | { NFS4ERR_EXIST, EEXIST }, | |
161 | { NFS4ERR_XDEV, EXDEV }, | |
162 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
163 | { NFS4ERR_ISDIR, EISDIR }, | |
164 | { NFS4ERR_INVAL, EINVAL }, | |
165 | { NFS4ERR_FBIG, EFBIG }, | |
166 | { NFS4ERR_NOSPC, ENOSPC }, | |
167 | { NFS4ERR_ROFS, EROFS }, | |
168 | { NFS4ERR_MLINK, EMLINK }, | |
169 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
170 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
171 | { NFS4ERR_DQUOT, EDQUOT }, | |
172 | { NFS4ERR_STALE, ESTALE }, | |
173 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
174 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
175 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
176 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
177 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
178 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
179 | { NFS4ERR_LOCKED, EAGAIN }, | |
180 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
181 | { NFS4ERR_SYMLINK, ELOOP }, | |
182 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
183 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
184 | { -1, EIO } | |
185 | }; | |
186 | ||
187 | static int | |
188 | nfs_cb_stat_to_errno(int stat) | |
189 | { | |
190 | int i; | |
191 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
192 | if (nfs_cb_errtbl[i].stat == stat) | |
193 | return nfs_cb_errtbl[i].errno; | |
194 | } | |
195 | /* If we cannot translate the error, the recovery routines should | |
196 | * handle it. | |
197 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
198 | * not conflict with native Linux error codes. | |
199 | */ | |
200 | return stat; | |
201 | } | |
202 | ||
203 | /* | |
204 | * XDR encode | |
205 | */ | |
206 | ||
207 | static int | |
208 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) | |
209 | { | |
f00f328f | 210 | __be32 * p; |
1da177e4 LT |
211 | |
212 | RESERVE_SPACE(16); | |
213 | WRITE32(0); /* tag length is always 0 */ | |
214 | WRITE32(NFS4_MINOR_VERSION); | |
215 | WRITE32(hdr->ident); | |
216 | WRITE32(hdr->nops); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | static int | |
221 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec) | |
222 | { | |
f00f328f | 223 | __be32 *p; |
1da177e4 LT |
224 | int len = cb_rec->cbr_fhlen; |
225 | ||
226 | RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len); | |
227 | WRITE32(OP_CB_RECALL); | |
228 | WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t)); | |
229 | WRITE32(cb_rec->cbr_trunc); | |
230 | WRITE32(len); | |
231 | WRITEMEM(cb_rec->cbr_fhval, len); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int | |
f00f328f | 236 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
237 | { |
238 | struct xdr_stream xdrs, *xdr = &xdrs; | |
239 | ||
240 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
241 | RESERVE_SPACE(0); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static int | |
f00f328f | 246 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args) |
1da177e4 LT |
247 | { |
248 | struct xdr_stream xdr; | |
249 | struct nfs4_cb_compound_hdr hdr = { | |
250 | .ident = args->cbr_ident, | |
251 | .nops = 1, | |
252 | }; | |
253 | ||
254 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
255 | encode_cb_compound_hdr(&xdr, &hdr); | |
256 | return (encode_cb_recall(&xdr, args)); | |
257 | } | |
258 | ||
259 | ||
260 | static int | |
261 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 262 | __be32 *p; |
1da177e4 LT |
263 | |
264 | READ_BUF(8); | |
265 | READ32(hdr->status); | |
266 | READ32(hdr->taglen); | |
267 | READ_BUF(hdr->taglen + 4); | |
268 | hdr->tag = (char *)p; | |
269 | p += XDR_QUADLEN(hdr->taglen); | |
270 | READ32(hdr->nops); | |
271 | return 0; | |
272 | } | |
273 | ||
274 | static int | |
275 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
276 | { | |
f00f328f | 277 | __be32 *p; |
1da177e4 LT |
278 | u32 op; |
279 | int32_t nfserr; | |
280 | ||
281 | READ_BUF(8); | |
282 | READ32(op); | |
283 | if (op != expected) { | |
284 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
285 | " operation %d but we issued a request for %d\n", | |
286 | op, expected); | |
287 | return -EIO; | |
288 | } | |
289 | READ32(nfserr); | |
290 | if (nfserr != NFS_OK) | |
291 | return -nfs_cb_stat_to_errno(nfserr); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static int | |
f00f328f | 296 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
297 | { |
298 | return 0; | |
299 | } | |
300 | ||
301 | static int | |
f00f328f | 302 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
303 | { |
304 | struct xdr_stream xdr; | |
305 | struct nfs4_cb_compound_hdr hdr; | |
306 | int status; | |
307 | ||
308 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
309 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
310 | if (status) | |
311 | goto out; | |
312 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); | |
313 | out: | |
314 | return status; | |
315 | } | |
316 | ||
317 | /* | |
318 | * RPC procedure tables | |
319 | */ | |
1da177e4 LT |
320 | #define PROC(proc, call, argtype, restype) \ |
321 | [NFSPROC4_CLNT_##proc] = { \ | |
322 | .p_proc = NFSPROC4_CB_##call, \ | |
323 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
324 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
325 | .p_arglen = NFS4_##argtype##_sz, \ |
326 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
327 | .p_statidx = NFSPROC4_CB_##call, \ |
328 | .p_name = #proc, \ | |
1da177e4 LT |
329 | } |
330 | ||
fd39ca9a | 331 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
332 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
333 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
334 | }; | |
335 | ||
fd39ca9a | 336 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 337 | .number = 1, |
e8c96f8c | 338 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
339 | .procs = nfs4_cb_procedures |
340 | }; | |
341 | ||
342 | static struct rpc_version * nfs_cb_version[] = { | |
343 | NULL, | |
344 | &nfs_cb_version4, | |
345 | }; | |
346 | ||
2b47eece BF |
347 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
348 | * And why is cb_set an atomic? */ | |
349 | ||
350 | static int do_probe_callback(void *data) | |
351 | { | |
352 | struct nfs4_client *clp = data; | |
1da177e4 LT |
353 | struct sockaddr_in addr; |
354 | struct nfs4_callback *cb = &clp->cl_callback; | |
ae5c7947 CL |
355 | struct rpc_timeout timeparms = { |
356 | .to_initval = (NFSD_LEASE_TIME/4) * HZ, | |
357 | .to_retries = 5, | |
358 | .to_maxval = (NFSD_LEASE_TIME/2) * HZ, | |
359 | .to_exponential = 1, | |
360 | }; | |
1da177e4 | 361 | struct rpc_program * program = &cb->cb_program; |
ae5c7947 CL |
362 | struct rpc_create_args args = { |
363 | .protocol = IPPROTO_TCP, | |
364 | .address = (struct sockaddr *)&addr, | |
365 | .addrsize = sizeof(addr), | |
366 | .timeout = &timeparms, | |
ae5c7947 CL |
367 | .program = program, |
368 | .version = nfs_cb_version[1]->number, | |
63c86716 | 369 | .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */ |
ae5c7947 CL |
370 | .flags = (RPC_CLNT_CREATE_NOPING), |
371 | }; | |
63c86716 BF |
372 | struct rpc_message msg = { |
373 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
374 | .rpc_argp = clp, | |
375 | }; | |
376 | struct rpc_clnt *client; | |
377 | int status; | |
1da177e4 LT |
378 | |
379 | /* Initialize address */ | |
380 | memset(&addr, 0, sizeof(addr)); | |
381 | addr.sin_family = AF_INET; | |
382 | addr.sin_port = htons(cb->cb_port); | |
383 | addr.sin_addr.s_addr = htonl(cb->cb_addr); | |
384 | ||
1da177e4 LT |
385 | /* Initialize rpc_program */ |
386 | program->name = "nfs4_cb"; | |
387 | program->number = cb->cb_prog; | |
e8c96f8c | 388 | program->nrvers = ARRAY_SIZE(nfs_cb_version); |
1da177e4 | 389 | program->version = nfs_cb_version; |
ae5c7947 | 390 | program->stats = &cb->cb_stat; |
1da177e4 LT |
391 | |
392 | /* Initialize rpc_stat */ | |
ae5c7947 CL |
393 | memset(program->stats, 0, sizeof(cb->cb_stat)); |
394 | program->stats->program = program; | |
395 | ||
396 | /* Create RPC client */ | |
63c86716 BF |
397 | client = rpc_create(&args); |
398 | if (IS_ERR(client)) { | |
1da177e4 | 399 | dprintk("NFSD: couldn't create callback client\n"); |
63c86716 | 400 | status = PTR_ERR(client); |
5b616f5d | 401 | goto out_err; |
1da177e4 | 402 | } |
1da177e4 | 403 | |
63c86716 BF |
404 | status = rpc_call_sync(client, &msg, RPC_TASK_SOFT); |
405 | ||
406 | if (status) | |
407 | goto out_release_client; | |
408 | ||
409 | cb->cb_client = client; | |
410 | atomic_set(&cb->cb_set, 1); | |
411 | put_nfs4_client(clp); | |
412 | return 0; | |
413 | out_release_client: | |
414 | rpc_shutdown_client(client); | |
415 | out_err: | |
416 | put_nfs4_client(clp); | |
417 | dprintk("NFSD: warning: no callback path to client %.*s\n", | |
418 | (int)clp->cl_name.len, clp->cl_name.data); | |
419 | return status; | |
420 | } | |
421 | ||
422 | /* | |
423 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
424 | */ | |
425 | void | |
426 | nfsd4_probe_callback(struct nfs4_client *clp) | |
427 | { | |
428 | struct task_struct *t; | |
429 | ||
430 | BUG_ON(atomic_read(&clp->cl_callback.cb_set)); | |
431 | ||
541e0e09 | 432 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
433 | atomic_inc(&clp->cl_count); |
434 | ||
2b47eece | 435 | t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe"); |
1da177e4 | 436 | |
2b47eece | 437 | if (IS_ERR(t)) |
63c86716 | 438 | atomic_dec(&clp->cl_count); |
2b47eece | 439 | |
1da177e4 | 440 | return; |
1da177e4 LT |
441 | } |
442 | ||
1da177e4 LT |
443 | /* |
444 | * called with dp->dl_count inc'ed. | |
445 | * nfs4_lock_state() may or may not have been called. | |
446 | */ | |
447 | void | |
448 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
449 | { | |
450 | struct nfs4_client *clp = dp->dl_client; | |
451 | struct rpc_clnt *clnt = clp->cl_callback.cb_client; | |
452 | struct nfs4_cb_recall *cbr = &dp->dl_recall; | |
453 | struct rpc_message msg = { | |
454 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
455 | .rpc_argp = cbr, | |
456 | }; | |
457 | int retries = 1; | |
458 | int status = 0; | |
459 | ||
460 | if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt) | |
461 | return; | |
462 | ||
1da177e4 LT |
463 | cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */ |
464 | cbr->cbr_dp = dp; | |
465 | ||
466 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
467 | while (retries--) { | |
468 | switch (status) { | |
469 | case -EIO: | |
470 | /* Network partition? */ | |
471 | case -EBADHANDLE: | |
472 | case -NFS4ERR_BAD_STATEID: | |
473 | /* Race: client probably got cb_recall | |
474 | * before open reply granting delegation */ | |
475 | break; | |
476 | default: | |
477 | goto out_put_cred; | |
478 | } | |
479 | ssleep(2); | |
480 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
481 | } | |
482 | out_put_cred: | |
1da177e4 LT |
483 | if (status == -EIO) |
484 | atomic_set(&clp->cl_callback.cb_set, 0); | |
485 | /* Success or failure, now we're either waiting for lease expiration | |
486 | * or deleg_return. */ | |
487 | dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count)); | |
cfdcad4d | 488 | put_nfs4_client(clp); |
1da177e4 LT |
489 | nfs4_put_delegation(dp); |
490 | return; | |
491 | } |