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Commit | Line | Data |
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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/sunrpc/clnt.h> |
37 | #include <linux/nfsd/nfsd.h> | |
38 | #include <linux/nfsd/state.h> | |
1da177e4 LT |
39 | |
40 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
41 | ||
42 | #define NFSPROC4_CB_NULL 0 | |
43 | #define NFSPROC4_CB_COMPOUND 1 | |
38524ab3 | 44 | #define NFS4_STATEID_SIZE 16 |
1da177e4 | 45 | |
1da177e4 LT |
46 | /* Index of predefined Linux callback client operations */ |
47 | ||
48 | enum { | |
4be36ca0 | 49 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 50 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 51 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
52 | }; |
53 | ||
54 | enum nfs_cb_opnum4 { | |
55 | OP_CB_RECALL = 4, | |
38524ab3 | 56 | OP_CB_SEQUENCE = 11, |
1da177e4 LT |
57 | }; |
58 | ||
59 | #define NFS4_MAXTAGLEN 20 | |
60 | ||
61 | #define NFS4_enc_cb_null_sz 0 | |
62 | #define NFS4_dec_cb_null_sz 0 | |
63 | #define cb_compound_enc_hdr_sz 4 | |
64 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
65 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
66 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
67 | 1 /* no referring calls list yet */) | |
68 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
69 | ||
1da177e4 LT |
70 | #define op_enc_sz 1 |
71 | #define op_dec_sz 2 | |
72 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 73 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 74 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 75 | cb_sequence_enc_sz + \ |
1da177e4 LT |
76 | 1 + enc_stateid_sz + \ |
77 | enc_nfs4_fh_sz) | |
78 | ||
79 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 80 | cb_sequence_dec_sz + \ |
1da177e4 LT |
81 | op_dec_sz) |
82 | ||
132f9771 RL |
83 | struct nfs4_rpc_args { |
84 | void *args_op; | |
85 | struct nfsd4_cb_sequence args_seq; | |
86 | }; | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
90 | */ | |
f00f328f AV |
91 | static inline __be32 * |
92 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
93 | { |
94 | int tmp = XDR_QUADLEN(nbytes); | |
95 | if (!tmp) | |
96 | return p; | |
97 | p[tmp-1] = 0; | |
98 | memcpy(p, ptr, nbytes); | |
99 | return p + tmp; | |
100 | } | |
101 | ||
102 | #define WRITE32(n) *p++ = htonl(n) | |
103 | #define WRITEMEM(ptr,nbytes) do { \ | |
104 | p = xdr_writemem(p, ptr, nbytes); \ | |
105 | } while (0) | |
106 | #define RESERVE_SPACE(nbytes) do { \ | |
107 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 108 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
109 | BUG_ON(!p); \ |
110 | } while (0) | |
111 | ||
112 | /* | |
113 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
114 | */ | |
115 | #define DECODE_TAIL \ | |
116 | status = 0; \ | |
117 | out: \ | |
118 | return status; \ | |
119 | xdr_error: \ | |
120 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
121 | status = -EIO; \ | |
122 | goto out | |
123 | ||
124 | #define READ32(x) (x) = ntohl(*p++) | |
125 | #define READ64(x) do { \ | |
126 | (x) = (u64)ntohl(*p++) << 32; \ | |
127 | (x) |= ntohl(*p++); \ | |
128 | } while (0) | |
129 | #define READTIME(x) do { \ | |
130 | p++; \ | |
131 | (x.tv_sec) = ntohl(*p++); \ | |
132 | (x.tv_nsec) = ntohl(*p++); \ | |
133 | } while (0) | |
134 | #define READ_BUF(nbytes) do { \ | |
135 | p = xdr_inline_decode(xdr, nbytes); \ | |
136 | if (!p) { \ | |
3e3b4800 | 137 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 138 | __func__, __LINE__); \ |
1da177e4 LT |
139 | return -EIO; \ |
140 | } \ | |
141 | } while (0) | |
142 | ||
143 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
144 | /* args */ |
145 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 146 | u32 nops; |
ef52bff8 | 147 | __be32 *nops_p; |
ab52ae6d | 148 | u32 minorversion; |
38524ab3 AA |
149 | /* res */ |
150 | int status; | |
1da177e4 | 151 | u32 taglen; |
ef52bff8 | 152 | char *tag; |
1da177e4 LT |
153 | }; |
154 | ||
155 | static struct { | |
156 | int stat; | |
157 | int errno; | |
158 | } nfs_cb_errtbl[] = { | |
159 | { NFS4_OK, 0 }, | |
160 | { NFS4ERR_PERM, EPERM }, | |
161 | { NFS4ERR_NOENT, ENOENT }, | |
162 | { NFS4ERR_IO, EIO }, | |
163 | { NFS4ERR_NXIO, ENXIO }, | |
164 | { NFS4ERR_ACCESS, EACCES }, | |
165 | { NFS4ERR_EXIST, EEXIST }, | |
166 | { NFS4ERR_XDEV, EXDEV }, | |
167 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
168 | { NFS4ERR_ISDIR, EISDIR }, | |
169 | { NFS4ERR_INVAL, EINVAL }, | |
170 | { NFS4ERR_FBIG, EFBIG }, | |
171 | { NFS4ERR_NOSPC, ENOSPC }, | |
172 | { NFS4ERR_ROFS, EROFS }, | |
173 | { NFS4ERR_MLINK, EMLINK }, | |
174 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
175 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
176 | { NFS4ERR_DQUOT, EDQUOT }, | |
177 | { NFS4ERR_STALE, ESTALE }, | |
178 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
179 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
180 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
181 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
182 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
183 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
184 | { NFS4ERR_LOCKED, EAGAIN }, | |
185 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
186 | { NFS4ERR_SYMLINK, ELOOP }, | |
187 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
188 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
189 | { -1, EIO } | |
190 | }; | |
191 | ||
192 | static int | |
193 | nfs_cb_stat_to_errno(int stat) | |
194 | { | |
195 | int i; | |
196 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
197 | if (nfs_cb_errtbl[i].stat == stat) | |
198 | return nfs_cb_errtbl[i].errno; | |
199 | } | |
200 | /* If we cannot translate the error, the recovery routines should | |
201 | * handle it. | |
202 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
203 | * not conflict with native Linux error codes. | |
204 | */ | |
205 | return stat; | |
206 | } | |
207 | ||
208 | /* | |
209 | * XDR encode | |
210 | */ | |
211 | ||
ef52bff8 | 212 | static void |
1da177e4 LT |
213 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
214 | { | |
f00f328f | 215 | __be32 * p; |
1da177e4 LT |
216 | |
217 | RESERVE_SPACE(16); | |
218 | WRITE32(0); /* tag length is always 0 */ | |
ab52ae6d | 219 | WRITE32(hdr->minorversion); |
1da177e4 | 220 | WRITE32(hdr->ident); |
ef52bff8 | 221 | hdr->nops_p = p; |
1da177e4 | 222 | WRITE32(hdr->nops); |
1da177e4 LT |
223 | } |
224 | ||
ef52bff8 AA |
225 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
226 | { | |
227 | *hdr->nops_p = htonl(hdr->nops); | |
228 | } | |
229 | ||
230 | static void | |
231 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
232 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 233 | { |
f00f328f | 234 | __be32 *p; |
b53d40c5 | 235 | int len = dp->dl_fh.fh_size; |
1da177e4 | 236 | |
b53d40c5 | 237 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 238 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
239 | WRITE32(dp->dl_stateid.si_generation); |
240 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 241 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 242 | WRITE32(len); |
b53d40c5 | 243 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 244 | hdr->nops++; |
1da177e4 LT |
245 | } |
246 | ||
2af73580 BH |
247 | static void |
248 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
249 | struct nfs4_cb_compound_hdr *hdr) | |
250 | { | |
251 | __be32 *p; | |
252 | ||
253 | if (hdr->minorversion == 0) | |
254 | return; | |
255 | ||
256 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
257 | ||
258 | WRITE32(OP_CB_SEQUENCE); | |
259 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
260 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
261 | WRITE32(0); /* slotid, always 0 */ | |
262 | WRITE32(0); /* highest slotid always 0 */ | |
263 | WRITE32(0); /* cachethis always 0 */ | |
264 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
265 | hdr->nops++; | |
266 | } | |
267 | ||
1da177e4 | 268 | static int |
f00f328f | 269 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
270 | { |
271 | struct xdr_stream xdrs, *xdr = &xdrs; | |
272 | ||
273 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
274 | RESERVE_SPACE(0); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int | |
0421b5c5 RL |
279 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
280 | struct nfs4_rpc_args *rpc_args) | |
1da177e4 LT |
281 | { |
282 | struct xdr_stream xdr; | |
0421b5c5 | 283 | struct nfs4_delegation *args = rpc_args->args_op; |
1da177e4 | 284 | struct nfs4_cb_compound_hdr hdr = { |
b53d40c5 | 285 | .ident = args->dl_ident, |
0421b5c5 | 286 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
1da177e4 LT |
287 | }; |
288 | ||
289 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
290 | encode_cb_compound_hdr(&xdr, &hdr); | |
0421b5c5 | 291 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
ef52bff8 AA |
292 | encode_cb_recall(&xdr, args, &hdr); |
293 | encode_cb_nops(&hdr); | |
294 | return 0; | |
1da177e4 LT |
295 | } |
296 | ||
297 | ||
298 | static int | |
299 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 300 | __be32 *p; |
1da177e4 LT |
301 | |
302 | READ_BUF(8); | |
303 | READ32(hdr->status); | |
304 | READ32(hdr->taglen); | |
305 | READ_BUF(hdr->taglen + 4); | |
306 | hdr->tag = (char *)p; | |
307 | p += XDR_QUADLEN(hdr->taglen); | |
308 | READ32(hdr->nops); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static int | |
313 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
314 | { | |
f00f328f | 315 | __be32 *p; |
1da177e4 LT |
316 | u32 op; |
317 | int32_t nfserr; | |
318 | ||
319 | READ_BUF(8); | |
320 | READ32(op); | |
321 | if (op != expected) { | |
322 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
323 | " operation %d but we issued a request for %d\n", | |
324 | op, expected); | |
325 | return -EIO; | |
326 | } | |
327 | READ32(nfserr); | |
328 | if (nfserr != NFS_OK) | |
329 | return -nfs_cb_stat_to_errno(nfserr); | |
330 | return 0; | |
331 | } | |
332 | ||
2af73580 BH |
333 | /* |
334 | * Our current back channel implmentation supports a single backchannel | |
335 | * with a single slot. | |
336 | */ | |
337 | static int | |
338 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
339 | struct rpc_rqst *rqstp) | |
340 | { | |
341 | struct nfs4_sessionid id; | |
342 | int status; | |
343 | u32 dummy; | |
344 | __be32 *p; | |
345 | ||
346 | if (res->cbs_minorversion == 0) | |
347 | return 0; | |
348 | ||
349 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
350 | if (status) | |
351 | return status; | |
352 | ||
353 | /* | |
354 | * If the server returns different values for sessionID, slotID or | |
355 | * sequence number, the server is looney tunes. | |
356 | */ | |
357 | status = -ESERVERFAULT; | |
358 | ||
359 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
360 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
361 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
362 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
363 | NFS4_MAX_SESSIONID_LEN)) { | |
364 | dprintk("%s Invalid session id\n", __func__); | |
365 | goto out; | |
366 | } | |
367 | READ32(dummy); | |
368 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
369 | dprintk("%s Invalid sequence number\n", __func__); | |
370 | goto out; | |
371 | } | |
372 | READ32(dummy); /* slotid must be 0 */ | |
373 | if (dummy != 0) { | |
374 | dprintk("%s Invalid slotid\n", __func__); | |
375 | goto out; | |
376 | } | |
377 | /* FIXME: process highest slotid and target highest slotid */ | |
378 | status = 0; | |
379 | out: | |
380 | return status; | |
381 | } | |
382 | ||
383 | ||
1da177e4 | 384 | static int |
f00f328f | 385 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
386 | { |
387 | return 0; | |
388 | } | |
389 | ||
390 | static int | |
0421b5c5 RL |
391 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
392 | struct nfsd4_cb_sequence *seq) | |
1da177e4 LT |
393 | { |
394 | struct xdr_stream xdr; | |
395 | struct nfs4_cb_compound_hdr hdr; | |
396 | int status; | |
397 | ||
398 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
399 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
400 | if (status) | |
401 | goto out; | |
0421b5c5 RL |
402 | if (seq) { |
403 | status = decode_cb_sequence(&xdr, seq, rqstp); | |
404 | if (status) | |
405 | goto out; | |
406 | } | |
1da177e4 LT |
407 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
408 | out: | |
409 | return status; | |
410 | } | |
411 | ||
412 | /* | |
413 | * RPC procedure tables | |
414 | */ | |
1da177e4 LT |
415 | #define PROC(proc, call, argtype, restype) \ |
416 | [NFSPROC4_CLNT_##proc] = { \ | |
417 | .p_proc = NFSPROC4_CB_##call, \ | |
418 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
419 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
420 | .p_arglen = NFS4_##argtype##_sz, \ |
421 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
422 | .p_statidx = NFSPROC4_CB_##call, \ |
423 | .p_name = #proc, \ | |
1da177e4 LT |
424 | } |
425 | ||
fd39ca9a | 426 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
427 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
428 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
429 | }; | |
430 | ||
fd39ca9a | 431 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 432 | .number = 1, |
e8c96f8c | 433 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
434 | .procs = nfs4_cb_procedures |
435 | }; | |
436 | ||
437 | static struct rpc_version * nfs_cb_version[] = { | |
438 | NULL, | |
439 | &nfs_cb_version4, | |
440 | }; | |
441 | ||
ff7d9756 OK |
442 | static struct rpc_program cb_program; |
443 | ||
444 | static struct rpc_stat cb_stats = { | |
445 | .program = &cb_program | |
446 | }; | |
447 | ||
448 | #define NFS4_CALLBACK 0x40000000 | |
449 | static struct rpc_program cb_program = { | |
450 | .name = "nfs4_cb", | |
451 | .number = NFS4_CALLBACK, | |
452 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
453 | .version = nfs_cb_version, | |
454 | .stats = &cb_stats, | |
61054b14 | 455 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
456 | }; |
457 | ||
595947ac BF |
458 | static int max_cb_time(void) |
459 | { | |
460 | return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ; | |
461 | } | |
462 | ||
2b47eece BF |
463 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
464 | * And why is cb_set an atomic? */ | |
465 | ||
e1cab5a5 | 466 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 467 | { |
c237dc03 | 468 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 469 | struct rpc_timeout timeparms = { |
595947ac BF |
470 | .to_initval = max_cb_time(), |
471 | .to_retries = 0, | |
ae5c7947 | 472 | }; |
ae5c7947 | 473 | struct rpc_create_args args = { |
3ddc8bf5 | 474 | .protocol = XPRT_TRANSPORT_TCP, |
aa9a4ec7 JL |
475 | .address = (struct sockaddr *) &cb->cb_addr, |
476 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 477 | .timeout = &timeparms, |
ff7d9756 | 478 | .program = &cb_program, |
d5b337b4 | 479 | .prognumber = cb->cb_prog, |
ae5c7947 | 480 | .version = nfs_cb_version[1]->number, |
61054b14 | 481 | .authflavor = clp->cl_flavor, |
b6b6152c | 482 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 483 | .client_name = clp->cl_principal, |
ae5c7947 | 484 | }; |
63c86716 | 485 | struct rpc_clnt *client; |
1da177e4 | 486 | |
418cd20a | 487 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 488 | return -EINVAL; |
3ddc8bf5 AB |
489 | if (cb->cb_minorversion) { |
490 | args.bc_xprt = clp->cl_cb_xprt; | |
491 | args.protocol = XPRT_TRANSPORT_BC_TCP; | |
492 | } | |
ae5c7947 | 493 | /* Create RPC client */ |
63c86716 | 494 | client = rpc_create(&args); |
e1cab5a5 | 495 | if (IS_ERR(client)) { |
a601caed BF |
496 | dprintk("NFSD: couldn't create callback client: %ld\n", |
497 | PTR_ERR(client)); | |
e1cab5a5 BF |
498 | return PTR_ERR(client); |
499 | } | |
500 | cb->cb_client = client; | |
501 | return 0; | |
a601caed BF |
502 | |
503 | } | |
504 | ||
ecdd03b7 BF |
505 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
506 | { | |
507 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
508 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
509 | } | |
510 | ||
e300a63c BF |
511 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
512 | { | |
513 | struct nfs4_client *clp = calldata; | |
514 | ||
515 | if (task->tk_status) | |
516 | warn_no_callback_path(clp, task->tk_status); | |
517 | else | |
c237dc03 | 518 | atomic_set(&clp->cl_cb_conn.cb_set, 1); |
e300a63c BF |
519 | put_nfs4_client(clp); |
520 | } | |
521 | ||
522 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
523 | .rpc_call_done = nfsd4_cb_probe_done, | |
524 | }; | |
525 | ||
80fc015b BF |
526 | static struct rpc_cred *callback_cred; |
527 | ||
528 | int set_callback_cred(void) | |
3cef9ab2 | 529 | { |
80fc015b BF |
530 | callback_cred = rpc_lookup_machine_cred(); |
531 | if (!callback_cred) | |
532 | return -ENOMEM; | |
533 | return 0; | |
3cef9ab2 BF |
534 | } |
535 | ||
80fc015b | 536 | |
e300a63c | 537 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 538 | { |
c237dc03 | 539 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
a601caed BF |
540 | struct rpc_message msg = { |
541 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
542 | .rpc_argp = clp, | |
80fc015b | 543 | .rpc_cred = callback_cred |
a601caed | 544 | }; |
a601caed BF |
545 | int status; |
546 | ||
e300a63c BF |
547 | status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT, |
548 | &nfsd4_cb_probe_ops, (void *)clp); | |
e300a63c | 549 | if (status) { |
ecdd03b7 | 550 | warn_no_callback_path(clp, status); |
e300a63c BF |
551 | put_nfs4_client(clp); |
552 | } | |
63c86716 BF |
553 | } |
554 | ||
555 | /* | |
556 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
557 | */ | |
558 | void | |
559 | nfsd4_probe_callback(struct nfs4_client *clp) | |
560 | { | |
ecdd03b7 | 561 | int status; |
63c86716 | 562 | |
c237dc03 | 563 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
63c86716 | 564 | |
ecdd03b7 BF |
565 | status = setup_callback_client(clp); |
566 | if (status) { | |
567 | warn_no_callback_path(clp, status); | |
568 | return; | |
569 | } | |
570 | ||
541e0e09 | 571 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
572 | atomic_inc(&clp->cl_count); |
573 | ||
e300a63c | 574 | do_probe_callback(clp); |
1da177e4 LT |
575 | } |
576 | ||
2a1d1b59 RL |
577 | /* |
578 | * There's currently a single callback channel slot. | |
579 | * If the slot is available, then mark it busy. Otherwise, set the | |
580 | * thread for sleeping on the callback RPC wait queue. | |
581 | */ | |
582 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
583 | struct rpc_task *task) | |
584 | { | |
585 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
586 | u32 *ptr = (u32 *)clp->cl_sessionid.data; | |
587 | int status = 0; | |
588 | ||
589 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
590 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
591 | ||
592 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
593 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
594 | dprintk("%s slot is busy\n", __func__); | |
595 | status = -EAGAIN; | |
596 | goto out; | |
597 | } | |
598 | ||
599 | /* | |
600 | * We'll need the clp during XDR encoding and decoding, | |
601 | * and the sequence during decoding to verify the reply | |
602 | */ | |
603 | args->args_seq.cbs_clp = clp; | |
604 | task->tk_msg.rpc_resp = &args->args_seq; | |
605 | ||
606 | out: | |
607 | dprintk("%s status=%d\n", __func__, status); | |
608 | return status; | |
609 | } | |
610 | ||
611 | /* | |
612 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
613 | * slots, and mark callback channel down on communication errors. | |
614 | */ | |
615 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
616 | { | |
617 | struct nfs4_delegation *dp = calldata; | |
618 | struct nfs4_client *clp = dp->dl_client; | |
619 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
620 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; | |
621 | int status = 0; | |
622 | ||
623 | args->args_seq.cbs_minorversion = minorversion; | |
624 | if (minorversion) { | |
625 | status = nfsd41_cb_setup_sequence(clp, task); | |
626 | if (status) { | |
627 | if (status != -EAGAIN) { | |
628 | /* terminate rpc task */ | |
629 | task->tk_status = status; | |
630 | task->tk_action = NULL; | |
631 | } | |
632 | return; | |
633 | } | |
634 | } | |
635 | rpc_call_start(task); | |
636 | } | |
637 | ||
0421b5c5 RL |
638 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
639 | { | |
640 | struct nfs4_delegation *dp = calldata; | |
641 | struct nfs4_client *clp = dp->dl_client; | |
642 | ||
643 | dprintk("%s: minorversion=%d\n", __func__, | |
644 | clp->cl_cb_conn.cb_minorversion); | |
645 | ||
646 | if (clp->cl_cb_conn.cb_minorversion) { | |
647 | /* No need for lock, access serialized in nfsd4_cb_prepare */ | |
648 | ++clp->cl_cb_seq_nr; | |
649 | clear_bit(0, &clp->cl_cb_slot_busy); | |
650 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
651 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
652 | clp->cl_cb_seq_nr); | |
653 | ||
654 | /* We're done looking into the sequence information */ | |
655 | task->tk_msg.rpc_resp = NULL; | |
656 | } | |
657 | } | |
658 | ||
63e4863f BF |
659 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
660 | { | |
661 | struct nfs4_delegation *dp = calldata; | |
662 | struct nfs4_client *clp = dp->dl_client; | |
663 | ||
0421b5c5 RL |
664 | nfsd4_cb_done(task, calldata); |
665 | ||
63e4863f BF |
666 | switch (task->tk_status) { |
667 | case -EIO: | |
668 | /* Network partition? */ | |
669 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
670 | warn_no_callback_path(clp, task->tk_status); | |
671 | case -EBADHANDLE: | |
672 | case -NFS4ERR_BAD_STATEID: | |
673 | /* Race: client probably got cb_recall | |
674 | * before open reply granting delegation */ | |
675 | break; | |
676 | default: | |
677 | /* success, or error we can't handle */ | |
0421b5c5 | 678 | goto done; |
63e4863f BF |
679 | } |
680 | if (dp->dl_retries--) { | |
681 | rpc_delay(task, 2*HZ); | |
682 | task->tk_status = 0; | |
683 | rpc_restart_call(task); | |
0421b5c5 | 684 | return; |
63e4863f BF |
685 | } else { |
686 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
687 | warn_no_callback_path(clp, task->tk_status); | |
688 | } | |
0421b5c5 RL |
689 | done: |
690 | kfree(task->tk_msg.rpc_argp); | |
63e4863f BF |
691 | } |
692 | ||
693 | static void nfsd4_cb_recall_release(void *calldata) | |
694 | { | |
695 | struct nfs4_delegation *dp = calldata; | |
696 | struct nfs4_client *clp = dp->dl_client; | |
697 | ||
698 | nfs4_put_delegation(dp); | |
699 | put_nfs4_client(clp); | |
700 | } | |
701 | ||
702 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 703 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
704 | .rpc_call_done = nfsd4_cb_recall_done, |
705 | .rpc_release = nfsd4_cb_recall_release, | |
706 | }; | |
707 | ||
1da177e4 LT |
708 | /* |
709 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
710 | */ |
711 | void | |
712 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
713 | { | |
714 | struct nfs4_client *clp = dp->dl_client; | |
c237dc03 | 715 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
0421b5c5 | 716 | struct nfs4_rpc_args *args; |
1da177e4 LT |
717 | struct rpc_message msg = { |
718 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
80fc015b | 719 | .rpc_cred = callback_cred |
1da177e4 | 720 | }; |
0421b5c5 | 721 | int status = -ENOMEM; |
1da177e4 | 722 | |
0421b5c5 RL |
723 | args = kzalloc(sizeof(*args), GFP_KERNEL); |
724 | if (!args) | |
725 | goto out; | |
726 | args->args_op = dp; | |
727 | msg.rpc_argp = args; | |
3aea09dc | 728 | dp->dl_retries = 1; |
63e4863f BF |
729 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
730 | &nfsd4_cb_recall_ops, dp); | |
0421b5c5 | 731 | out: |
63e4863f | 732 | if (status) { |
0421b5c5 | 733 | kfree(args); |
63e4863f BF |
734 | put_nfs4_client(clp); |
735 | nfs4_put_delegation(dp); | |
1da177e4 | 736 | } |
1da177e4 | 737 | } |