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Commit | Line | Data |
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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> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
9a74af21 BH |
36 | #include "nfsd.h" |
37 | #include "state.h" | |
1da177e4 LT |
38 | |
39 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
40 | ||
41 | #define NFSPROC4_CB_NULL 0 | |
42 | #define NFSPROC4_CB_COMPOUND 1 | |
38524ab3 | 43 | #define NFS4_STATEID_SIZE 16 |
1da177e4 | 44 | |
1da177e4 LT |
45 | /* Index of predefined Linux callback client operations */ |
46 | ||
47 | enum { | |
4be36ca0 | 48 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 49 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 50 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
51 | }; |
52 | ||
53 | enum nfs_cb_opnum4 { | |
54 | OP_CB_RECALL = 4, | |
38524ab3 | 55 | OP_CB_SEQUENCE = 11, |
1da177e4 LT |
56 | }; |
57 | ||
58 | #define NFS4_MAXTAGLEN 20 | |
59 | ||
60 | #define NFS4_enc_cb_null_sz 0 | |
61 | #define NFS4_dec_cb_null_sz 0 | |
62 | #define cb_compound_enc_hdr_sz 4 | |
63 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
64 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
65 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
66 | 1 /* no referring calls list yet */) | |
67 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
68 | ||
1da177e4 LT |
69 | #define op_enc_sz 1 |
70 | #define op_dec_sz 2 | |
71 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 72 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 73 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 74 | cb_sequence_enc_sz + \ |
1da177e4 LT |
75 | 1 + enc_stateid_sz + \ |
76 | enc_nfs4_fh_sz) | |
77 | ||
78 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 79 | cb_sequence_dec_sz + \ |
1da177e4 LT |
80 | op_dec_sz) |
81 | ||
132f9771 RL |
82 | struct nfs4_rpc_args { |
83 | void *args_op; | |
84 | struct nfsd4_cb_sequence args_seq; | |
85 | }; | |
86 | ||
1da177e4 LT |
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); \ | |
8e24eea7 | 107 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
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", \ |
8e24eea7 | 137 | __func__, __LINE__); \ |
1da177e4 LT |
138 | return -EIO; \ |
139 | } \ | |
140 | } while (0) | |
141 | ||
142 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
143 | /* args */ |
144 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 145 | u32 nops; |
ef52bff8 | 146 | __be32 *nops_p; |
ab52ae6d | 147 | u32 minorversion; |
38524ab3 AA |
148 | /* res */ |
149 | int status; | |
1da177e4 | 150 | u32 taglen; |
ef52bff8 | 151 | char *tag; |
1da177e4 LT |
152 | }; |
153 | ||
154 | static struct { | |
155 | int stat; | |
156 | int errno; | |
157 | } nfs_cb_errtbl[] = { | |
158 | { NFS4_OK, 0 }, | |
159 | { NFS4ERR_PERM, EPERM }, | |
160 | { NFS4ERR_NOENT, ENOENT }, | |
161 | { NFS4ERR_IO, EIO }, | |
162 | { NFS4ERR_NXIO, ENXIO }, | |
163 | { NFS4ERR_ACCESS, EACCES }, | |
164 | { NFS4ERR_EXIST, EEXIST }, | |
165 | { NFS4ERR_XDEV, EXDEV }, | |
166 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
167 | { NFS4ERR_ISDIR, EISDIR }, | |
168 | { NFS4ERR_INVAL, EINVAL }, | |
169 | { NFS4ERR_FBIG, EFBIG }, | |
170 | { NFS4ERR_NOSPC, ENOSPC }, | |
171 | { NFS4ERR_ROFS, EROFS }, | |
172 | { NFS4ERR_MLINK, EMLINK }, | |
173 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
174 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
175 | { NFS4ERR_DQUOT, EDQUOT }, | |
176 | { NFS4ERR_STALE, ESTALE }, | |
177 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
178 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
179 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
180 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
181 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
182 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
183 | { NFS4ERR_LOCKED, EAGAIN }, | |
184 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
185 | { NFS4ERR_SYMLINK, ELOOP }, | |
186 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
187 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
188 | { -1, EIO } | |
189 | }; | |
190 | ||
191 | static int | |
192 | nfs_cb_stat_to_errno(int stat) | |
193 | { | |
194 | int i; | |
195 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
196 | if (nfs_cb_errtbl[i].stat == stat) | |
197 | return nfs_cb_errtbl[i].errno; | |
198 | } | |
199 | /* If we cannot translate the error, the recovery routines should | |
200 | * handle it. | |
201 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
202 | * not conflict with native Linux error codes. | |
203 | */ | |
204 | return stat; | |
205 | } | |
206 | ||
207 | /* | |
208 | * XDR encode | |
209 | */ | |
210 | ||
ef52bff8 | 211 | static void |
1da177e4 LT |
212 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
213 | { | |
f00f328f | 214 | __be32 * p; |
1da177e4 LT |
215 | |
216 | RESERVE_SPACE(16); | |
217 | WRITE32(0); /* tag length is always 0 */ | |
ab52ae6d | 218 | WRITE32(hdr->minorversion); |
1da177e4 | 219 | WRITE32(hdr->ident); |
ef52bff8 | 220 | hdr->nops_p = p; |
1da177e4 | 221 | WRITE32(hdr->nops); |
1da177e4 LT |
222 | } |
223 | ||
ef52bff8 AA |
224 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
225 | { | |
226 | *hdr->nops_p = htonl(hdr->nops); | |
227 | } | |
228 | ||
229 | static void | |
230 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
231 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 232 | { |
f00f328f | 233 | __be32 *p; |
b53d40c5 | 234 | int len = dp->dl_fh.fh_size; |
1da177e4 | 235 | |
b53d40c5 | 236 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 237 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
238 | WRITE32(dp->dl_stateid.si_generation); |
239 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 240 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 241 | WRITE32(len); |
b53d40c5 | 242 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 243 | hdr->nops++; |
1da177e4 LT |
244 | } |
245 | ||
2af73580 BH |
246 | static void |
247 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
248 | struct nfs4_cb_compound_hdr *hdr) | |
249 | { | |
250 | __be32 *p; | |
251 | ||
252 | if (hdr->minorversion == 0) | |
253 | return; | |
254 | ||
255 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
256 | ||
257 | WRITE32(OP_CB_SEQUENCE); | |
258 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
259 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
260 | WRITE32(0); /* slotid, always 0 */ | |
261 | WRITE32(0); /* highest slotid always 0 */ | |
262 | WRITE32(0); /* cachethis always 0 */ | |
263 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
264 | hdr->nops++; | |
265 | } | |
266 | ||
1da177e4 | 267 | static int |
f00f328f | 268 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
269 | { |
270 | struct xdr_stream xdrs, *xdr = &xdrs; | |
271 | ||
272 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
273 | RESERVE_SPACE(0); | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static int | |
0421b5c5 RL |
278 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
279 | struct nfs4_rpc_args *rpc_args) | |
1da177e4 LT |
280 | { |
281 | struct xdr_stream xdr; | |
0421b5c5 | 282 | struct nfs4_delegation *args = rpc_args->args_op; |
1da177e4 | 283 | struct nfs4_cb_compound_hdr hdr = { |
b53d40c5 | 284 | .ident = args->dl_ident, |
0421b5c5 | 285 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
1da177e4 LT |
286 | }; |
287 | ||
288 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
289 | encode_cb_compound_hdr(&xdr, &hdr); | |
0421b5c5 | 290 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
ef52bff8 AA |
291 | encode_cb_recall(&xdr, args, &hdr); |
292 | encode_cb_nops(&hdr); | |
293 | return 0; | |
1da177e4 LT |
294 | } |
295 | ||
296 | ||
297 | static int | |
298 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 299 | __be32 *p; |
1da177e4 LT |
300 | |
301 | READ_BUF(8); | |
302 | READ32(hdr->status); | |
303 | READ32(hdr->taglen); | |
304 | READ_BUF(hdr->taglen + 4); | |
305 | hdr->tag = (char *)p; | |
306 | p += XDR_QUADLEN(hdr->taglen); | |
307 | READ32(hdr->nops); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int | |
312 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
313 | { | |
f00f328f | 314 | __be32 *p; |
1da177e4 LT |
315 | u32 op; |
316 | int32_t nfserr; | |
317 | ||
318 | READ_BUF(8); | |
319 | READ32(op); | |
320 | if (op != expected) { | |
321 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
322 | " operation %d but we issued a request for %d\n", | |
323 | op, expected); | |
324 | return -EIO; | |
325 | } | |
326 | READ32(nfserr); | |
327 | if (nfserr != NFS_OK) | |
328 | return -nfs_cb_stat_to_errno(nfserr); | |
329 | return 0; | |
330 | } | |
331 | ||
2af73580 BH |
332 | /* |
333 | * Our current back channel implmentation supports a single backchannel | |
334 | * with a single slot. | |
335 | */ | |
336 | static int | |
337 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
338 | struct rpc_rqst *rqstp) | |
339 | { | |
340 | struct nfs4_sessionid id; | |
341 | int status; | |
342 | u32 dummy; | |
343 | __be32 *p; | |
344 | ||
345 | if (res->cbs_minorversion == 0) | |
346 | return 0; | |
347 | ||
348 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
349 | if (status) | |
350 | return status; | |
351 | ||
352 | /* | |
353 | * If the server returns different values for sessionID, slotID or | |
354 | * sequence number, the server is looney tunes. | |
355 | */ | |
356 | status = -ESERVERFAULT; | |
357 | ||
358 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
359 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
360 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
361 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
362 | NFS4_MAX_SESSIONID_LEN)) { | |
363 | dprintk("%s Invalid session id\n", __func__); | |
364 | goto out; | |
365 | } | |
366 | READ32(dummy); | |
367 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
368 | dprintk("%s Invalid sequence number\n", __func__); | |
369 | goto out; | |
370 | } | |
371 | READ32(dummy); /* slotid must be 0 */ | |
372 | if (dummy != 0) { | |
373 | dprintk("%s Invalid slotid\n", __func__); | |
374 | goto out; | |
375 | } | |
376 | /* FIXME: process highest slotid and target highest slotid */ | |
377 | status = 0; | |
378 | out: | |
379 | return status; | |
380 | } | |
381 | ||
382 | ||
1da177e4 | 383 | static int |
f00f328f | 384 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
385 | { |
386 | return 0; | |
387 | } | |
388 | ||
389 | static int | |
0421b5c5 RL |
390 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
391 | struct nfsd4_cb_sequence *seq) | |
1da177e4 LT |
392 | { |
393 | struct xdr_stream xdr; | |
394 | struct nfs4_cb_compound_hdr hdr; | |
395 | int status; | |
396 | ||
397 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
398 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
399 | if (status) | |
400 | goto out; | |
0421b5c5 RL |
401 | if (seq) { |
402 | status = decode_cb_sequence(&xdr, seq, rqstp); | |
403 | if (status) | |
404 | goto out; | |
405 | } | |
1da177e4 LT |
406 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
407 | out: | |
408 | return status; | |
409 | } | |
410 | ||
411 | /* | |
412 | * RPC procedure tables | |
413 | */ | |
1da177e4 LT |
414 | #define PROC(proc, call, argtype, restype) \ |
415 | [NFSPROC4_CLNT_##proc] = { \ | |
416 | .p_proc = NFSPROC4_CB_##call, \ | |
417 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
418 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
419 | .p_arglen = NFS4_##argtype##_sz, \ |
420 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
421 | .p_statidx = NFSPROC4_CB_##call, \ |
422 | .p_name = #proc, \ | |
1da177e4 LT |
423 | } |
424 | ||
fd39ca9a | 425 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
426 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
427 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
428 | }; | |
429 | ||
fd39ca9a | 430 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 431 | .number = 1, |
e8c96f8c | 432 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
433 | .procs = nfs4_cb_procedures |
434 | }; | |
435 | ||
436 | static struct rpc_version * nfs_cb_version[] = { | |
437 | NULL, | |
438 | &nfs_cb_version4, | |
439 | }; | |
440 | ||
ff7d9756 OK |
441 | static struct rpc_program cb_program; |
442 | ||
443 | static struct rpc_stat cb_stats = { | |
444 | .program = &cb_program | |
445 | }; | |
446 | ||
447 | #define NFS4_CALLBACK 0x40000000 | |
448 | static struct rpc_program cb_program = { | |
449 | .name = "nfs4_cb", | |
450 | .number = NFS4_CALLBACK, | |
451 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
452 | .version = nfs_cb_version, | |
453 | .stats = &cb_stats, | |
61054b14 | 454 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
455 | }; |
456 | ||
595947ac BF |
457 | static int max_cb_time(void) |
458 | { | |
459 | return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ; | |
460 | } | |
461 | ||
2b47eece BF |
462 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
463 | * And why is cb_set an atomic? */ | |
464 | ||
e1cab5a5 | 465 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 466 | { |
c237dc03 | 467 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 468 | struct rpc_timeout timeparms = { |
595947ac BF |
469 | .to_initval = max_cb_time(), |
470 | .to_retries = 0, | |
ae5c7947 | 471 | }; |
ae5c7947 | 472 | struct rpc_create_args args = { |
3ddc8bf5 | 473 | .protocol = XPRT_TRANSPORT_TCP, |
aa9a4ec7 JL |
474 | .address = (struct sockaddr *) &cb->cb_addr, |
475 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 476 | .timeout = &timeparms, |
ff7d9756 | 477 | .program = &cb_program, |
d5b337b4 | 478 | .prognumber = cb->cb_prog, |
ae5c7947 | 479 | .version = nfs_cb_version[1]->number, |
61054b14 | 480 | .authflavor = clp->cl_flavor, |
b6b6152c | 481 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 482 | .client_name = clp->cl_principal, |
ae5c7947 | 483 | }; |
63c86716 | 484 | struct rpc_clnt *client; |
1da177e4 | 485 | |
418cd20a | 486 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 487 | return -EINVAL; |
3ddc8bf5 AB |
488 | if (cb->cb_minorversion) { |
489 | args.bc_xprt = clp->cl_cb_xprt; | |
490 | args.protocol = XPRT_TRANSPORT_BC_TCP; | |
491 | } | |
ae5c7947 | 492 | /* Create RPC client */ |
63c86716 | 493 | client = rpc_create(&args); |
e1cab5a5 | 494 | if (IS_ERR(client)) { |
a601caed BF |
495 | dprintk("NFSD: couldn't create callback client: %ld\n", |
496 | PTR_ERR(client)); | |
e1cab5a5 BF |
497 | return PTR_ERR(client); |
498 | } | |
499 | cb->cb_client = client; | |
500 | return 0; | |
a601caed BF |
501 | |
502 | } | |
503 | ||
ecdd03b7 BF |
504 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
505 | { | |
506 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
507 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
508 | } | |
509 | ||
e300a63c BF |
510 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
511 | { | |
512 | struct nfs4_client *clp = calldata; | |
513 | ||
514 | if (task->tk_status) | |
515 | warn_no_callback_path(clp, task->tk_status); | |
516 | else | |
c237dc03 | 517 | atomic_set(&clp->cl_cb_conn.cb_set, 1); |
e300a63c BF |
518 | put_nfs4_client(clp); |
519 | } | |
520 | ||
521 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
522 | .rpc_call_done = nfsd4_cb_probe_done, | |
523 | }; | |
524 | ||
80fc015b BF |
525 | static struct rpc_cred *callback_cred; |
526 | ||
527 | int set_callback_cred(void) | |
3cef9ab2 | 528 | { |
8d75da8a BF |
529 | if (callback_cred) |
530 | return 0; | |
80fc015b BF |
531 | callback_cred = rpc_lookup_machine_cred(); |
532 | if (!callback_cred) | |
533 | return -ENOMEM; | |
534 | return 0; | |
3cef9ab2 BF |
535 | } |
536 | ||
80fc015b | 537 | |
e300a63c | 538 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 539 | { |
c237dc03 | 540 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
a601caed BF |
541 | struct rpc_message msg = { |
542 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
543 | .rpc_argp = clp, | |
80fc015b | 544 | .rpc_cred = callback_cred |
a601caed | 545 | }; |
a601caed BF |
546 | int status; |
547 | ||
58255a4e CL |
548 | status = rpc_call_async(cb->cb_client, &msg, |
549 | RPC_TASK_SOFT | RPC_TASK_SOFTCONN, | |
e300a63c | 550 | &nfsd4_cb_probe_ops, (void *)clp); |
e300a63c | 551 | if (status) { |
ecdd03b7 | 552 | warn_no_callback_path(clp, status); |
e300a63c BF |
553 | put_nfs4_client(clp); |
554 | } | |
63c86716 BF |
555 | } |
556 | ||
557 | /* | |
558 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
559 | */ | |
560 | void | |
561 | nfsd4_probe_callback(struct nfs4_client *clp) | |
562 | { | |
ecdd03b7 | 563 | int status; |
63c86716 | 564 | |
c237dc03 | 565 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
63c86716 | 566 | |
ecdd03b7 BF |
567 | status = setup_callback_client(clp); |
568 | if (status) { | |
569 | warn_no_callback_path(clp, status); | |
570 | return; | |
571 | } | |
572 | ||
541e0e09 | 573 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
574 | atomic_inc(&clp->cl_count); |
575 | ||
e300a63c | 576 | do_probe_callback(clp); |
1da177e4 LT |
577 | } |
578 | ||
2a1d1b59 RL |
579 | /* |
580 | * There's currently a single callback channel slot. | |
581 | * If the slot is available, then mark it busy. Otherwise, set the | |
582 | * thread for sleeping on the callback RPC wait queue. | |
583 | */ | |
584 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
585 | struct rpc_task *task) | |
586 | { | |
587 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
588 | u32 *ptr = (u32 *)clp->cl_sessionid.data; | |
589 | int status = 0; | |
590 | ||
591 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
592 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
593 | ||
594 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
595 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
596 | dprintk("%s slot is busy\n", __func__); | |
597 | status = -EAGAIN; | |
598 | goto out; | |
599 | } | |
600 | ||
601 | /* | |
602 | * We'll need the clp during XDR encoding and decoding, | |
603 | * and the sequence during decoding to verify the reply | |
604 | */ | |
605 | args->args_seq.cbs_clp = clp; | |
606 | task->tk_msg.rpc_resp = &args->args_seq; | |
607 | ||
608 | out: | |
609 | dprintk("%s status=%d\n", __func__, status); | |
610 | return status; | |
611 | } | |
612 | ||
613 | /* | |
614 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
615 | * slots, and mark callback channel down on communication errors. | |
616 | */ | |
617 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
618 | { | |
619 | struct nfs4_delegation *dp = calldata; | |
620 | struct nfs4_client *clp = dp->dl_client; | |
621 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
622 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; | |
623 | int status = 0; | |
624 | ||
625 | args->args_seq.cbs_minorversion = minorversion; | |
626 | if (minorversion) { | |
627 | status = nfsd41_cb_setup_sequence(clp, task); | |
628 | if (status) { | |
629 | if (status != -EAGAIN) { | |
630 | /* terminate rpc task */ | |
631 | task->tk_status = status; | |
632 | task->tk_action = NULL; | |
633 | } | |
634 | return; | |
635 | } | |
636 | } | |
637 | rpc_call_start(task); | |
638 | } | |
639 | ||
0421b5c5 RL |
640 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
641 | { | |
642 | struct nfs4_delegation *dp = calldata; | |
643 | struct nfs4_client *clp = dp->dl_client; | |
644 | ||
645 | dprintk("%s: minorversion=%d\n", __func__, | |
646 | clp->cl_cb_conn.cb_minorversion); | |
647 | ||
648 | if (clp->cl_cb_conn.cb_minorversion) { | |
649 | /* No need for lock, access serialized in nfsd4_cb_prepare */ | |
650 | ++clp->cl_cb_seq_nr; | |
651 | clear_bit(0, &clp->cl_cb_slot_busy); | |
652 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
653 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
654 | clp->cl_cb_seq_nr); | |
655 | ||
656 | /* We're done looking into the sequence information */ | |
657 | task->tk_msg.rpc_resp = NULL; | |
658 | } | |
659 | } | |
660 | ||
63e4863f BF |
661 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
662 | { | |
663 | struct nfs4_delegation *dp = calldata; | |
664 | struct nfs4_client *clp = dp->dl_client; | |
665 | ||
0421b5c5 RL |
666 | nfsd4_cb_done(task, calldata); |
667 | ||
63e4863f BF |
668 | switch (task->tk_status) { |
669 | case -EIO: | |
670 | /* Network partition? */ | |
671 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
672 | warn_no_callback_path(clp, task->tk_status); | |
673 | case -EBADHANDLE: | |
674 | case -NFS4ERR_BAD_STATEID: | |
675 | /* Race: client probably got cb_recall | |
676 | * before open reply granting delegation */ | |
677 | break; | |
678 | default: | |
679 | /* success, or error we can't handle */ | |
0421b5c5 | 680 | goto done; |
63e4863f BF |
681 | } |
682 | if (dp->dl_retries--) { | |
683 | rpc_delay(task, 2*HZ); | |
684 | task->tk_status = 0; | |
685 | rpc_restart_call(task); | |
0421b5c5 | 686 | return; |
63e4863f BF |
687 | } else { |
688 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
689 | warn_no_callback_path(clp, task->tk_status); | |
690 | } | |
0421b5c5 RL |
691 | done: |
692 | kfree(task->tk_msg.rpc_argp); | |
63e4863f BF |
693 | } |
694 | ||
695 | static void nfsd4_cb_recall_release(void *calldata) | |
696 | { | |
697 | struct nfs4_delegation *dp = calldata; | |
698 | struct nfs4_client *clp = dp->dl_client; | |
699 | ||
700 | nfs4_put_delegation(dp); | |
701 | put_nfs4_client(clp); | |
702 | } | |
703 | ||
704 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 705 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
706 | .rpc_call_done = nfsd4_cb_recall_done, |
707 | .rpc_release = nfsd4_cb_recall_release, | |
708 | }; | |
709 | ||
1da177e4 LT |
710 | /* |
711 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
712 | */ |
713 | void | |
714 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
715 | { | |
716 | struct nfs4_client *clp = dp->dl_client; | |
c237dc03 | 717 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
0421b5c5 | 718 | struct nfs4_rpc_args *args; |
1da177e4 LT |
719 | struct rpc_message msg = { |
720 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
80fc015b | 721 | .rpc_cred = callback_cred |
1da177e4 | 722 | }; |
0421b5c5 | 723 | int status = -ENOMEM; |
1da177e4 | 724 | |
0421b5c5 RL |
725 | args = kzalloc(sizeof(*args), GFP_KERNEL); |
726 | if (!args) | |
727 | goto out; | |
728 | args->args_op = dp; | |
729 | msg.rpc_argp = args; | |
3aea09dc | 730 | dp->dl_retries = 1; |
63e4863f BF |
731 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
732 | &nfsd4_cb_recall_ops, dp); | |
0421b5c5 | 733 | out: |
63e4863f | 734 | if (status) { |
0421b5c5 | 735 | kfree(args); |
63e4863f BF |
736 | put_nfs4_client(clp); |
737 | nfs4_put_delegation(dp); | |
1da177e4 | 738 | } |
1da177e4 | 739 | } |