Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (c) 2001 The Regents of the University of Michigan. |
3 | * All rights reserved. | |
4 | * | |
5 | * Kendrick Smith <kmsmith@umich.edu> | |
6 | * Andy Adamson <andros@umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the name of the University nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
1da177e4 | 34 | #include <linux/sunrpc/clnt.h> |
9a74af21 BH |
35 | #include "nfsd.h" |
36 | #include "state.h" | |
1da177e4 LT |
37 | |
38 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
39 | ||
40 | #define NFSPROC4_CB_NULL 0 | |
41 | #define NFSPROC4_CB_COMPOUND 1 | |
38524ab3 | 42 | #define NFS4_STATEID_SIZE 16 |
1da177e4 | 43 | |
1da177e4 LT |
44 | /* Index of predefined Linux callback client operations */ |
45 | ||
46 | enum { | |
4be36ca0 | 47 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 48 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 49 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
50 | }; |
51 | ||
52 | enum nfs_cb_opnum4 { | |
53 | OP_CB_RECALL = 4, | |
38524ab3 | 54 | OP_CB_SEQUENCE = 11, |
1da177e4 LT |
55 | }; |
56 | ||
57 | #define NFS4_MAXTAGLEN 20 | |
58 | ||
59 | #define NFS4_enc_cb_null_sz 0 | |
60 | #define NFS4_dec_cb_null_sz 0 | |
61 | #define cb_compound_enc_hdr_sz 4 | |
62 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
63 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
64 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
65 | 1 /* no referring calls list yet */) | |
66 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
67 | ||
1da177e4 LT |
68 | #define op_enc_sz 1 |
69 | #define op_dec_sz 2 | |
70 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 71 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 72 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 73 | cb_sequence_enc_sz + \ |
1da177e4 LT |
74 | 1 + enc_stateid_sz + \ |
75 | enc_nfs4_fh_sz) | |
76 | ||
77 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 78 | cb_sequence_dec_sz + \ |
1da177e4 LT |
79 | op_dec_sz) |
80 | ||
81 | /* | |
82 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
83 | */ | |
f00f328f AV |
84 | static inline __be32 * |
85 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
86 | { |
87 | int tmp = XDR_QUADLEN(nbytes); | |
88 | if (!tmp) | |
89 | return p; | |
90 | p[tmp-1] = 0; | |
91 | memcpy(p, ptr, nbytes); | |
92 | return p + tmp; | |
93 | } | |
94 | ||
95 | #define WRITE32(n) *p++ = htonl(n) | |
96 | #define WRITEMEM(ptr,nbytes) do { \ | |
97 | p = xdr_writemem(p, ptr, nbytes); \ | |
98 | } while (0) | |
99 | #define RESERVE_SPACE(nbytes) do { \ | |
100 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 101 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
102 | BUG_ON(!p); \ |
103 | } while (0) | |
104 | ||
105 | /* | |
106 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
107 | */ | |
108 | #define DECODE_TAIL \ | |
109 | status = 0; \ | |
110 | out: \ | |
111 | return status; \ | |
112 | xdr_error: \ | |
113 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
114 | status = -EIO; \ | |
115 | goto out | |
116 | ||
117 | #define READ32(x) (x) = ntohl(*p++) | |
118 | #define READ64(x) do { \ | |
119 | (x) = (u64)ntohl(*p++) << 32; \ | |
120 | (x) |= ntohl(*p++); \ | |
121 | } while (0) | |
122 | #define READTIME(x) do { \ | |
123 | p++; \ | |
124 | (x.tv_sec) = ntohl(*p++); \ | |
125 | (x.tv_nsec) = ntohl(*p++); \ | |
126 | } while (0) | |
127 | #define READ_BUF(nbytes) do { \ | |
128 | p = xdr_inline_decode(xdr, nbytes); \ | |
129 | if (!p) { \ | |
3e3b4800 | 130 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 131 | __func__, __LINE__); \ |
1da177e4 LT |
132 | return -EIO; \ |
133 | } \ | |
134 | } while (0) | |
135 | ||
136 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
137 | /* args */ |
138 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 139 | u32 nops; |
ef52bff8 | 140 | __be32 *nops_p; |
ab52ae6d | 141 | u32 minorversion; |
38524ab3 AA |
142 | /* res */ |
143 | int status; | |
1da177e4 | 144 | u32 taglen; |
ef52bff8 | 145 | char *tag; |
1da177e4 LT |
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 | ||
ef52bff8 | 205 | static void |
1da177e4 LT |
206 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
207 | { | |
f00f328f | 208 | __be32 * p; |
1da177e4 LT |
209 | |
210 | RESERVE_SPACE(16); | |
211 | WRITE32(0); /* tag length is always 0 */ | |
ab52ae6d | 212 | WRITE32(hdr->minorversion); |
1da177e4 | 213 | WRITE32(hdr->ident); |
ef52bff8 | 214 | hdr->nops_p = p; |
1da177e4 | 215 | WRITE32(hdr->nops); |
1da177e4 LT |
216 | } |
217 | ||
ef52bff8 AA |
218 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
219 | { | |
220 | *hdr->nops_p = htonl(hdr->nops); | |
221 | } | |
222 | ||
223 | static void | |
224 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
225 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 226 | { |
f00f328f | 227 | __be32 *p; |
b53d40c5 | 228 | int len = dp->dl_fh.fh_size; |
1da177e4 | 229 | |
b53d40c5 | 230 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 231 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
232 | WRITE32(dp->dl_stateid.si_generation); |
233 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 234 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 235 | WRITE32(len); |
b53d40c5 | 236 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 237 | hdr->nops++; |
1da177e4 LT |
238 | } |
239 | ||
2af73580 BH |
240 | static void |
241 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
242 | struct nfs4_cb_compound_hdr *hdr) | |
243 | { | |
244 | __be32 *p; | |
245 | ||
246 | if (hdr->minorversion == 0) | |
247 | return; | |
248 | ||
249 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
250 | ||
251 | WRITE32(OP_CB_SEQUENCE); | |
252 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
253 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
254 | WRITE32(0); /* slotid, always 0 */ | |
255 | WRITE32(0); /* highest slotid always 0 */ | |
256 | WRITE32(0); /* cachethis always 0 */ | |
257 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
258 | hdr->nops++; | |
259 | } | |
260 | ||
1da177e4 | 261 | static int |
f00f328f | 262 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
263 | { |
264 | struct xdr_stream xdrs, *xdr = &xdrs; | |
265 | ||
266 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
267 | RESERVE_SPACE(0); | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int | |
0421b5c5 RL |
272 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
273 | struct nfs4_rpc_args *rpc_args) | |
1da177e4 LT |
274 | { |
275 | struct xdr_stream xdr; | |
0421b5c5 | 276 | struct nfs4_delegation *args = rpc_args->args_op; |
1da177e4 | 277 | struct nfs4_cb_compound_hdr hdr = { |
b53d40c5 | 278 | .ident = args->dl_ident, |
0421b5c5 | 279 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
1da177e4 LT |
280 | }; |
281 | ||
282 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
283 | encode_cb_compound_hdr(&xdr, &hdr); | |
0421b5c5 | 284 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
ef52bff8 AA |
285 | encode_cb_recall(&xdr, args, &hdr); |
286 | encode_cb_nops(&hdr); | |
287 | return 0; | |
1da177e4 LT |
288 | } |
289 | ||
290 | ||
291 | static int | |
292 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 293 | __be32 *p; |
1da177e4 LT |
294 | |
295 | READ_BUF(8); | |
296 | READ32(hdr->status); | |
297 | READ32(hdr->taglen); | |
298 | READ_BUF(hdr->taglen + 4); | |
299 | hdr->tag = (char *)p; | |
300 | p += XDR_QUADLEN(hdr->taglen); | |
301 | READ32(hdr->nops); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int | |
306 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
307 | { | |
f00f328f | 308 | __be32 *p; |
1da177e4 LT |
309 | u32 op; |
310 | int32_t nfserr; | |
311 | ||
312 | READ_BUF(8); | |
313 | READ32(op); | |
314 | if (op != expected) { | |
315 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
316 | " operation %d but we issued a request for %d\n", | |
317 | op, expected); | |
318 | return -EIO; | |
319 | } | |
320 | READ32(nfserr); | |
321 | if (nfserr != NFS_OK) | |
322 | return -nfs_cb_stat_to_errno(nfserr); | |
323 | return 0; | |
324 | } | |
325 | ||
2af73580 BH |
326 | /* |
327 | * Our current back channel implmentation supports a single backchannel | |
328 | * with a single slot. | |
329 | */ | |
330 | static int | |
331 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
332 | struct rpc_rqst *rqstp) | |
333 | { | |
334 | struct nfs4_sessionid id; | |
335 | int status; | |
336 | u32 dummy; | |
337 | __be32 *p; | |
338 | ||
339 | if (res->cbs_minorversion == 0) | |
340 | return 0; | |
341 | ||
342 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
343 | if (status) | |
344 | return status; | |
345 | ||
346 | /* | |
347 | * If the server returns different values for sessionID, slotID or | |
348 | * sequence number, the server is looney tunes. | |
349 | */ | |
350 | status = -ESERVERFAULT; | |
351 | ||
352 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
353 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
354 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
355 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
356 | NFS4_MAX_SESSIONID_LEN)) { | |
357 | dprintk("%s Invalid session id\n", __func__); | |
358 | goto out; | |
359 | } | |
360 | READ32(dummy); | |
361 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
362 | dprintk("%s Invalid sequence number\n", __func__); | |
363 | goto out; | |
364 | } | |
365 | READ32(dummy); /* slotid must be 0 */ | |
366 | if (dummy != 0) { | |
367 | dprintk("%s Invalid slotid\n", __func__); | |
368 | goto out; | |
369 | } | |
370 | /* FIXME: process highest slotid and target highest slotid */ | |
371 | status = 0; | |
372 | out: | |
373 | return status; | |
374 | } | |
375 | ||
376 | ||
1da177e4 | 377 | static int |
f00f328f | 378 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
379 | { |
380 | return 0; | |
381 | } | |
382 | ||
383 | static int | |
0421b5c5 RL |
384 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
385 | struct nfsd4_cb_sequence *seq) | |
1da177e4 LT |
386 | { |
387 | struct xdr_stream xdr; | |
388 | struct nfs4_cb_compound_hdr hdr; | |
389 | int status; | |
390 | ||
391 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
392 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
393 | if (status) | |
394 | goto out; | |
0421b5c5 RL |
395 | if (seq) { |
396 | status = decode_cb_sequence(&xdr, seq, rqstp); | |
397 | if (status) | |
398 | goto out; | |
399 | } | |
1da177e4 LT |
400 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
401 | out: | |
402 | return status; | |
403 | } | |
404 | ||
405 | /* | |
406 | * RPC procedure tables | |
407 | */ | |
1da177e4 LT |
408 | #define PROC(proc, call, argtype, restype) \ |
409 | [NFSPROC4_CLNT_##proc] = { \ | |
410 | .p_proc = NFSPROC4_CB_##call, \ | |
411 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
412 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
413 | .p_arglen = NFS4_##argtype##_sz, \ |
414 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
415 | .p_statidx = NFSPROC4_CB_##call, \ |
416 | .p_name = #proc, \ | |
1da177e4 LT |
417 | } |
418 | ||
fd39ca9a | 419 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
420 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
421 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
422 | }; | |
423 | ||
fd39ca9a | 424 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 425 | .number = 1, |
e8c96f8c | 426 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
427 | .procs = nfs4_cb_procedures |
428 | }; | |
429 | ||
430 | static struct rpc_version * nfs_cb_version[] = { | |
431 | NULL, | |
432 | &nfs_cb_version4, | |
433 | }; | |
434 | ||
ff7d9756 OK |
435 | static struct rpc_program cb_program; |
436 | ||
437 | static struct rpc_stat cb_stats = { | |
438 | .program = &cb_program | |
439 | }; | |
440 | ||
441 | #define NFS4_CALLBACK 0x40000000 | |
442 | static struct rpc_program cb_program = { | |
443 | .name = "nfs4_cb", | |
444 | .number = NFS4_CALLBACK, | |
445 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
446 | .version = nfs_cb_version, | |
447 | .stats = &cb_stats, | |
61054b14 | 448 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
449 | }; |
450 | ||
595947ac BF |
451 | static int max_cb_time(void) |
452 | { | |
cf07d2ea | 453 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
454 | } |
455 | ||
2b47eece BF |
456 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
457 | * And why is cb_set an atomic? */ | |
458 | ||
e1cab5a5 | 459 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 460 | { |
c237dc03 | 461 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 462 | struct rpc_timeout timeparms = { |
595947ac BF |
463 | .to_initval = max_cb_time(), |
464 | .to_retries = 0, | |
ae5c7947 | 465 | }; |
ae5c7947 | 466 | struct rpc_create_args args = { |
3ddc8bf5 | 467 | .protocol = XPRT_TRANSPORT_TCP, |
aa9a4ec7 JL |
468 | .address = (struct sockaddr *) &cb->cb_addr, |
469 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 470 | .timeout = &timeparms, |
ff7d9756 | 471 | .program = &cb_program, |
d5b337b4 | 472 | .prognumber = cb->cb_prog, |
ae5c7947 | 473 | .version = nfs_cb_version[1]->number, |
61054b14 | 474 | .authflavor = clp->cl_flavor, |
b6b6152c | 475 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 476 | .client_name = clp->cl_principal, |
ae5c7947 | 477 | }; |
63c86716 | 478 | struct rpc_clnt *client; |
1da177e4 | 479 | |
418cd20a | 480 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 481 | return -EINVAL; |
3ddc8bf5 AB |
482 | if (cb->cb_minorversion) { |
483 | args.bc_xprt = clp->cl_cb_xprt; | |
484 | args.protocol = XPRT_TRANSPORT_BC_TCP; | |
485 | } | |
ae5c7947 | 486 | /* Create RPC client */ |
63c86716 | 487 | client = rpc_create(&args); |
e1cab5a5 | 488 | if (IS_ERR(client)) { |
a601caed BF |
489 | dprintk("NFSD: couldn't create callback client: %ld\n", |
490 | PTR_ERR(client)); | |
e1cab5a5 BF |
491 | return PTR_ERR(client); |
492 | } | |
493 | cb->cb_client = client; | |
494 | return 0; | |
a601caed BF |
495 | |
496 | } | |
497 | ||
ecdd03b7 BF |
498 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
499 | { | |
500 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
501 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
502 | } | |
503 | ||
e300a63c BF |
504 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
505 | { | |
506 | struct nfs4_client *clp = calldata; | |
507 | ||
508 | if (task->tk_status) | |
509 | warn_no_callback_path(clp, task->tk_status); | |
510 | else | |
c237dc03 | 511 | atomic_set(&clp->cl_cb_conn.cb_set, 1); |
e300a63c BF |
512 | } |
513 | ||
514 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
515 | .rpc_call_done = nfsd4_cb_probe_done, | |
516 | }; | |
517 | ||
80fc015b BF |
518 | static struct rpc_cred *callback_cred; |
519 | ||
520 | int set_callback_cred(void) | |
3cef9ab2 | 521 | { |
8d75da8a BF |
522 | if (callback_cred) |
523 | return 0; | |
80fc015b BF |
524 | callback_cred = rpc_lookup_machine_cred(); |
525 | if (!callback_cred) | |
526 | return -ENOMEM; | |
527 | return 0; | |
3cef9ab2 BF |
528 | } |
529 | ||
80fc015b | 530 | |
e300a63c | 531 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 532 | { |
c237dc03 | 533 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
a601caed BF |
534 | struct rpc_message msg = { |
535 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
536 | .rpc_argp = clp, | |
80fc015b | 537 | .rpc_cred = callback_cred |
a601caed | 538 | }; |
a601caed BF |
539 | int status; |
540 | ||
58255a4e CL |
541 | status = rpc_call_async(cb->cb_client, &msg, |
542 | RPC_TASK_SOFT | RPC_TASK_SOFTCONN, | |
e300a63c | 543 | &nfsd4_cb_probe_ops, (void *)clp); |
9045b4b9 | 544 | if (status) |
ecdd03b7 | 545 | warn_no_callback_path(clp, status); |
63c86716 BF |
546 | } |
547 | ||
548 | /* | |
549 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
550 | */ | |
551 | void | |
552 | nfsd4_probe_callback(struct nfs4_client *clp) | |
553 | { | |
ecdd03b7 | 554 | int status; |
63c86716 | 555 | |
c237dc03 | 556 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
63c86716 | 557 | |
ecdd03b7 BF |
558 | status = setup_callback_client(clp); |
559 | if (status) { | |
560 | warn_no_callback_path(clp, status); | |
561 | return; | |
562 | } | |
e300a63c | 563 | do_probe_callback(clp); |
1da177e4 LT |
564 | } |
565 | ||
2a1d1b59 RL |
566 | /* |
567 | * There's currently a single callback channel slot. | |
568 | * If the slot is available, then mark it busy. Otherwise, set the | |
569 | * thread for sleeping on the callback RPC wait queue. | |
570 | */ | |
571 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
572 | struct rpc_task *task) | |
573 | { | |
574 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
575 | u32 *ptr = (u32 *)clp->cl_sessionid.data; | |
576 | int status = 0; | |
577 | ||
578 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
579 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
580 | ||
581 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
582 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
583 | dprintk("%s slot is busy\n", __func__); | |
584 | status = -EAGAIN; | |
585 | goto out; | |
586 | } | |
587 | ||
588 | /* | |
589 | * We'll need the clp during XDR encoding and decoding, | |
590 | * and the sequence during decoding to verify the reply | |
591 | */ | |
592 | args->args_seq.cbs_clp = clp; | |
593 | task->tk_msg.rpc_resp = &args->args_seq; | |
594 | ||
595 | out: | |
596 | dprintk("%s status=%d\n", __func__, status); | |
597 | return status; | |
598 | } | |
599 | ||
600 | /* | |
601 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
602 | * slots, and mark callback channel down on communication errors. | |
603 | */ | |
604 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
605 | { | |
606 | struct nfs4_delegation *dp = calldata; | |
607 | struct nfs4_client *clp = dp->dl_client; | |
608 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
609 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; | |
610 | int status = 0; | |
611 | ||
612 | args->args_seq.cbs_minorversion = minorversion; | |
613 | if (minorversion) { | |
614 | status = nfsd41_cb_setup_sequence(clp, task); | |
615 | if (status) { | |
616 | if (status != -EAGAIN) { | |
617 | /* terminate rpc task */ | |
618 | task->tk_status = status; | |
619 | task->tk_action = NULL; | |
620 | } | |
621 | return; | |
622 | } | |
623 | } | |
624 | rpc_call_start(task); | |
625 | } | |
626 | ||
0421b5c5 RL |
627 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
628 | { | |
629 | struct nfs4_delegation *dp = calldata; | |
630 | struct nfs4_client *clp = dp->dl_client; | |
631 | ||
632 | dprintk("%s: minorversion=%d\n", __func__, | |
633 | clp->cl_cb_conn.cb_minorversion); | |
634 | ||
635 | if (clp->cl_cb_conn.cb_minorversion) { | |
636 | /* No need for lock, access serialized in nfsd4_cb_prepare */ | |
637 | ++clp->cl_cb_seq_nr; | |
638 | clear_bit(0, &clp->cl_cb_slot_busy); | |
639 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
640 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
641 | clp->cl_cb_seq_nr); | |
642 | ||
643 | /* We're done looking into the sequence information */ | |
644 | task->tk_msg.rpc_resp = NULL; | |
645 | } | |
646 | } | |
647 | ||
63e4863f BF |
648 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
649 | { | |
650 | struct nfs4_delegation *dp = calldata; | |
651 | struct nfs4_client *clp = dp->dl_client; | |
652 | ||
0421b5c5 RL |
653 | nfsd4_cb_done(task, calldata); |
654 | ||
63e4863f BF |
655 | switch (task->tk_status) { |
656 | case -EIO: | |
657 | /* Network partition? */ | |
658 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
659 | warn_no_callback_path(clp, task->tk_status); | |
660 | case -EBADHANDLE: | |
661 | case -NFS4ERR_BAD_STATEID: | |
662 | /* Race: client probably got cb_recall | |
663 | * before open reply granting delegation */ | |
664 | break; | |
665 | default: | |
666 | /* success, or error we can't handle */ | |
227f98d9 | 667 | return; |
63e4863f BF |
668 | } |
669 | if (dp->dl_retries--) { | |
670 | rpc_delay(task, 2*HZ); | |
671 | task->tk_status = 0; | |
672 | rpc_restart_call(task); | |
0421b5c5 | 673 | return; |
63e4863f BF |
674 | } else { |
675 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
676 | warn_no_callback_path(clp, task->tk_status); | |
677 | } | |
678 | } | |
679 | ||
680 | static void nfsd4_cb_recall_release(void *calldata) | |
681 | { | |
682 | struct nfs4_delegation *dp = calldata; | |
683 | struct nfs4_client *clp = dp->dl_client; | |
684 | ||
685 | nfs4_put_delegation(dp); | |
686 | put_nfs4_client(clp); | |
687 | } | |
688 | ||
689 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 690 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
691 | .rpc_call_done = nfsd4_cb_recall_done, |
692 | .rpc_release = nfsd4_cb_recall_release, | |
693 | }; | |
694 | ||
1da177e4 LT |
695 | /* |
696 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
697 | */ |
698 | void | |
699 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
700 | { | |
701 | struct nfs4_client *clp = dp->dl_client; | |
c237dc03 | 702 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
227f98d9 | 703 | struct nfs4_rpc_args *args = &dp->dl_recall.cb_args; |
1da177e4 LT |
704 | struct rpc_message msg = { |
705 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
80fc015b | 706 | .rpc_cred = callback_cred |
1da177e4 | 707 | }; |
227f98d9 | 708 | int status; |
1da177e4 | 709 | |
0421b5c5 RL |
710 | args->args_op = dp; |
711 | msg.rpc_argp = args; | |
3aea09dc | 712 | dp->dl_retries = 1; |
63e4863f BF |
713 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
714 | &nfsd4_cb_recall_ops, dp); | |
715 | if (status) { | |
716 | put_nfs4_client(clp); | |
717 | nfs4_put_delegation(dp); | |
1da177e4 | 718 | } |
1da177e4 | 719 | } |