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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> |
b5a1a81e | 35 | #include <linux/sunrpc/svc_xprt.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
9a74af21 BH |
37 | #include "nfsd.h" |
38 | #include "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 | ||
83 | /* | |
84 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
85 | */ | |
f00f328f AV |
86 | static inline __be32 * |
87 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
88 | { |
89 | int tmp = XDR_QUADLEN(nbytes); | |
90 | if (!tmp) | |
91 | return p; | |
92 | p[tmp-1] = 0; | |
93 | memcpy(p, ptr, nbytes); | |
94 | return p + tmp; | |
95 | } | |
96 | ||
97 | #define WRITE32(n) *p++ = htonl(n) | |
98 | #define WRITEMEM(ptr,nbytes) do { \ | |
99 | p = xdr_writemem(p, ptr, nbytes); \ | |
100 | } while (0) | |
101 | #define RESERVE_SPACE(nbytes) do { \ | |
102 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 103 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
104 | BUG_ON(!p); \ |
105 | } while (0) | |
106 | ||
107 | /* | |
108 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
109 | */ | |
110 | #define DECODE_TAIL \ | |
111 | status = 0; \ | |
112 | out: \ | |
113 | return status; \ | |
114 | xdr_error: \ | |
115 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
116 | status = -EIO; \ | |
117 | goto out | |
118 | ||
119 | #define READ32(x) (x) = ntohl(*p++) | |
120 | #define READ64(x) do { \ | |
121 | (x) = (u64)ntohl(*p++) << 32; \ | |
122 | (x) |= ntohl(*p++); \ | |
123 | } while (0) | |
124 | #define READTIME(x) do { \ | |
125 | p++; \ | |
126 | (x.tv_sec) = ntohl(*p++); \ | |
127 | (x.tv_nsec) = ntohl(*p++); \ | |
128 | } while (0) | |
129 | #define READ_BUF(nbytes) do { \ | |
130 | p = xdr_inline_decode(xdr, nbytes); \ | |
131 | if (!p) { \ | |
3e3b4800 | 132 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 133 | __func__, __LINE__); \ |
1da177e4 LT |
134 | return -EIO; \ |
135 | } \ | |
136 | } while (0) | |
137 | ||
138 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
139 | /* args */ |
140 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 141 | u32 nops; |
ef52bff8 | 142 | __be32 *nops_p; |
ab52ae6d | 143 | u32 minorversion; |
38524ab3 AA |
144 | /* res */ |
145 | int status; | |
1da177e4 | 146 | u32 taglen; |
ef52bff8 | 147 | char *tag; |
1da177e4 LT |
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 | ||
ef52bff8 | 207 | static void |
1da177e4 LT |
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 */ | |
ab52ae6d | 214 | WRITE32(hdr->minorversion); |
1da177e4 | 215 | WRITE32(hdr->ident); |
ef52bff8 | 216 | hdr->nops_p = p; |
1da177e4 | 217 | WRITE32(hdr->nops); |
1da177e4 LT |
218 | } |
219 | ||
ef52bff8 AA |
220 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
221 | { | |
222 | *hdr->nops_p = htonl(hdr->nops); | |
223 | } | |
224 | ||
225 | static void | |
226 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
227 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 228 | { |
f00f328f | 229 | __be32 *p; |
b53d40c5 | 230 | int len = dp->dl_fh.fh_size; |
1da177e4 | 231 | |
b53d40c5 | 232 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 233 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
234 | WRITE32(dp->dl_stateid.si_generation); |
235 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 236 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 237 | WRITE32(len); |
b53d40c5 | 238 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 239 | hdr->nops++; |
1da177e4 LT |
240 | } |
241 | ||
2af73580 BH |
242 | static void |
243 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
244 | struct nfs4_cb_compound_hdr *hdr) | |
245 | { | |
246 | __be32 *p; | |
247 | ||
248 | if (hdr->minorversion == 0) | |
249 | return; | |
250 | ||
251 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
252 | ||
253 | WRITE32(OP_CB_SEQUENCE); | |
254 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
255 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
256 | WRITE32(0); /* slotid, always 0 */ | |
257 | WRITE32(0); /* highest slotid always 0 */ | |
258 | WRITE32(0); /* cachethis always 0 */ | |
259 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
260 | hdr->nops++; | |
261 | } | |
262 | ||
1da177e4 | 263 | static int |
f00f328f | 264 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
265 | { |
266 | struct xdr_stream xdrs, *xdr = &xdrs; | |
267 | ||
268 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
269 | RESERVE_SPACE(0); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static int | |
0421b5c5 RL |
274 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
275 | struct nfs4_rpc_args *rpc_args) | |
1da177e4 LT |
276 | { |
277 | struct xdr_stream xdr; | |
0421b5c5 | 278 | struct nfs4_delegation *args = rpc_args->args_op; |
1da177e4 | 279 | struct nfs4_cb_compound_hdr hdr = { |
b53d40c5 | 280 | .ident = args->dl_ident, |
0421b5c5 | 281 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
1da177e4 LT |
282 | }; |
283 | ||
284 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
285 | encode_cb_compound_hdr(&xdr, &hdr); | |
0421b5c5 | 286 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
ef52bff8 AA |
287 | encode_cb_recall(&xdr, args, &hdr); |
288 | encode_cb_nops(&hdr); | |
289 | return 0; | |
1da177e4 LT |
290 | } |
291 | ||
292 | ||
293 | static int | |
294 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 295 | __be32 *p; |
1da177e4 LT |
296 | |
297 | READ_BUF(8); | |
298 | READ32(hdr->status); | |
299 | READ32(hdr->taglen); | |
300 | READ_BUF(hdr->taglen + 4); | |
301 | hdr->tag = (char *)p; | |
302 | p += XDR_QUADLEN(hdr->taglen); | |
303 | READ32(hdr->nops); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int | |
308 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
309 | { | |
f00f328f | 310 | __be32 *p; |
1da177e4 LT |
311 | u32 op; |
312 | int32_t nfserr; | |
313 | ||
314 | READ_BUF(8); | |
315 | READ32(op); | |
316 | if (op != expected) { | |
317 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
318 | " operation %d but we issued a request for %d\n", | |
319 | op, expected); | |
320 | return -EIO; | |
321 | } | |
322 | READ32(nfserr); | |
323 | if (nfserr != NFS_OK) | |
324 | return -nfs_cb_stat_to_errno(nfserr); | |
325 | return 0; | |
326 | } | |
327 | ||
2af73580 BH |
328 | /* |
329 | * Our current back channel implmentation supports a single backchannel | |
330 | * with a single slot. | |
331 | */ | |
332 | static int | |
333 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
334 | struct rpc_rqst *rqstp) | |
335 | { | |
336 | struct nfs4_sessionid id; | |
337 | int status; | |
338 | u32 dummy; | |
339 | __be32 *p; | |
340 | ||
341 | if (res->cbs_minorversion == 0) | |
342 | return 0; | |
343 | ||
344 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
345 | if (status) | |
346 | return status; | |
347 | ||
348 | /* | |
349 | * If the server returns different values for sessionID, slotID or | |
350 | * sequence number, the server is looney tunes. | |
351 | */ | |
352 | status = -ESERVERFAULT; | |
353 | ||
354 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
355 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
356 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
357 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
358 | NFS4_MAX_SESSIONID_LEN)) { | |
359 | dprintk("%s Invalid session id\n", __func__); | |
360 | goto out; | |
361 | } | |
362 | READ32(dummy); | |
363 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
364 | dprintk("%s Invalid sequence number\n", __func__); | |
365 | goto out; | |
366 | } | |
367 | READ32(dummy); /* slotid must be 0 */ | |
368 | if (dummy != 0) { | |
369 | dprintk("%s Invalid slotid\n", __func__); | |
370 | goto out; | |
371 | } | |
372 | /* FIXME: process highest slotid and target highest slotid */ | |
373 | status = 0; | |
374 | out: | |
375 | return status; | |
376 | } | |
377 | ||
378 | ||
1da177e4 | 379 | static int |
f00f328f | 380 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
381 | { |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int | |
0421b5c5 RL |
386 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
387 | struct nfsd4_cb_sequence *seq) | |
1da177e4 LT |
388 | { |
389 | struct xdr_stream xdr; | |
390 | struct nfs4_cb_compound_hdr hdr; | |
391 | int status; | |
392 | ||
393 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
394 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
395 | if (status) | |
396 | goto out; | |
0421b5c5 RL |
397 | if (seq) { |
398 | status = decode_cb_sequence(&xdr, seq, rqstp); | |
399 | if (status) | |
400 | goto out; | |
401 | } | |
1da177e4 LT |
402 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
403 | out: | |
404 | return status; | |
405 | } | |
406 | ||
407 | /* | |
408 | * RPC procedure tables | |
409 | */ | |
1da177e4 LT |
410 | #define PROC(proc, call, argtype, restype) \ |
411 | [NFSPROC4_CLNT_##proc] = { \ | |
412 | .p_proc = NFSPROC4_CB_##call, \ | |
413 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
414 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
415 | .p_arglen = NFS4_##argtype##_sz, \ |
416 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
417 | .p_statidx = NFSPROC4_CB_##call, \ |
418 | .p_name = #proc, \ | |
1da177e4 LT |
419 | } |
420 | ||
fd39ca9a | 421 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
422 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
423 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
424 | }; | |
425 | ||
fd39ca9a | 426 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
427 | /* |
428 | * Note on the callback rpc program version number: despite language in rfc | |
429 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
430 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
431 | * in practice that appears to be what implementations use. The section | |
432 | * 18.36.3 language is expected to be fixed in an erratum. | |
433 | */ | |
1da177e4 | 434 | .number = 1, |
e8c96f8c | 435 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
436 | .procs = nfs4_cb_procedures |
437 | }; | |
438 | ||
439 | static struct rpc_version * nfs_cb_version[] = { | |
1da177e4 LT |
440 | &nfs_cb_version4, |
441 | }; | |
442 | ||
ff7d9756 OK |
443 | static struct rpc_program cb_program; |
444 | ||
445 | static struct rpc_stat cb_stats = { | |
446 | .program = &cb_program | |
447 | }; | |
448 | ||
449 | #define NFS4_CALLBACK 0x40000000 | |
450 | static struct rpc_program cb_program = { | |
451 | .name = "nfs4_cb", | |
452 | .number = NFS4_CALLBACK, | |
453 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
454 | .version = nfs_cb_version, | |
455 | .stats = &cb_stats, | |
61054b14 | 456 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
457 | }; |
458 | ||
595947ac BF |
459 | static int max_cb_time(void) |
460 | { | |
cf07d2ea | 461 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
462 | } |
463 | ||
2b47eece | 464 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
2bf23875 | 465 | * And why is cl_cb_set an atomic? */ |
2b47eece | 466 | |
4b21d0de | 467 | int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *cb) |
2b47eece | 468 | { |
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, |
b7299f44 | 480 | .version = 0, |
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 | 489 | if (cb->cb_minorversion) { |
4b21d0de | 490 | args.bc_xprt = cb->cb_xprt; |
3ddc8bf5 AB |
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 | } | |
4b21d0de | 500 | nfsd4_set_callback_client(clp, client); |
e1cab5a5 | 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 | |
2bf23875 | 518 | atomic_set(&clp->cl_cb_set, 1); |
e300a63c BF |
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 | { |
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 | ||
2bf23875 | 547 | status = rpc_call_async(clp->cl_cb_client, &msg, |
58255a4e | 548 | RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
e300a63c | 549 | &nfsd4_cb_probe_ops, (void *)clp); |
9045b4b9 | 550 | if (status) |
ecdd03b7 | 551 | warn_no_callback_path(clp, status); |
63c86716 BF |
552 | } |
553 | ||
554 | /* | |
555 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
556 | */ | |
4b21d0de | 557 | void nfsd4_probe_callback(struct nfs4_client *clp, struct nfs4_cb_conn *cb) |
63c86716 | 558 | { |
ecdd03b7 | 559 | int status; |
63c86716 | 560 | |
2bf23875 | 561 | BUG_ON(atomic_read(&clp->cl_cb_set)); |
63c86716 | 562 | |
4b21d0de | 563 | status = setup_callback_client(clp, cb); |
ecdd03b7 BF |
564 | if (status) { |
565 | warn_no_callback_path(clp, status); | |
566 | return; | |
567 | } | |
e300a63c | 568 | do_probe_callback(clp); |
1da177e4 LT |
569 | } |
570 | ||
2a1d1b59 RL |
571 | /* |
572 | * There's currently a single callback channel slot. | |
573 | * If the slot is available, then mark it busy. Otherwise, set the | |
574 | * thread for sleeping on the callback RPC wait queue. | |
575 | */ | |
576 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
577 | struct rpc_task *task) | |
578 | { | |
579 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
580 | u32 *ptr = (u32 *)clp->cl_sessionid.data; | |
581 | int status = 0; | |
582 | ||
583 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
584 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
585 | ||
586 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
587 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
588 | dprintk("%s slot is busy\n", __func__); | |
589 | status = -EAGAIN; | |
590 | goto out; | |
591 | } | |
592 | ||
593 | /* | |
594 | * We'll need the clp during XDR encoding and decoding, | |
595 | * and the sequence during decoding to verify the reply | |
596 | */ | |
597 | args->args_seq.cbs_clp = clp; | |
598 | task->tk_msg.rpc_resp = &args->args_seq; | |
599 | ||
600 | out: | |
601 | dprintk("%s status=%d\n", __func__, status); | |
602 | return status; | |
603 | } | |
604 | ||
605 | /* | |
606 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
607 | * slots, and mark callback channel down on communication errors. | |
608 | */ | |
609 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
610 | { | |
611 | struct nfs4_delegation *dp = calldata; | |
612 | struct nfs4_client *clp = dp->dl_client; | |
613 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
614 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; | |
615 | int status = 0; | |
616 | ||
617 | args->args_seq.cbs_minorversion = minorversion; | |
618 | if (minorversion) { | |
619 | status = nfsd41_cb_setup_sequence(clp, task); | |
620 | if (status) { | |
621 | if (status != -EAGAIN) { | |
622 | /* terminate rpc task */ | |
623 | task->tk_status = status; | |
624 | task->tk_action = NULL; | |
625 | } | |
626 | return; | |
627 | } | |
628 | } | |
629 | rpc_call_start(task); | |
630 | } | |
631 | ||
0421b5c5 RL |
632 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
633 | { | |
634 | struct nfs4_delegation *dp = calldata; | |
635 | struct nfs4_client *clp = dp->dl_client; | |
636 | ||
637 | dprintk("%s: minorversion=%d\n", __func__, | |
638 | clp->cl_cb_conn.cb_minorversion); | |
639 | ||
640 | if (clp->cl_cb_conn.cb_minorversion) { | |
641 | /* No need for lock, access serialized in nfsd4_cb_prepare */ | |
642 | ++clp->cl_cb_seq_nr; | |
643 | clear_bit(0, &clp->cl_cb_slot_busy); | |
644 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
645 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
646 | clp->cl_cb_seq_nr); | |
647 | ||
648 | /* We're done looking into the sequence information */ | |
649 | task->tk_msg.rpc_resp = NULL; | |
650 | } | |
651 | } | |
652 | ||
4b21d0de | 653 | |
63e4863f BF |
654 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
655 | { | |
656 | struct nfs4_delegation *dp = calldata; | |
657 | struct nfs4_client *clp = dp->dl_client; | |
4b21d0de | 658 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 659 | |
0421b5c5 RL |
660 | nfsd4_cb_done(task, calldata); |
661 | ||
4b21d0de BF |
662 | if (current_rpc_client == NULL) { |
663 | /* We're shutting down; give up. */ | |
664 | /* XXX: err, or is it ok just to fall through | |
665 | * and rpc_restart_call? */ | |
666 | return; | |
667 | } | |
668 | ||
63e4863f BF |
669 | switch (task->tk_status) { |
670 | case -EIO: | |
671 | /* Network partition? */ | |
2bf23875 | 672 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f | 673 | warn_no_callback_path(clp, task->tk_status); |
4b21d0de BF |
674 | if (current_rpc_client != task->tk_client) { |
675 | /* queue a callback on the new connection: */ | |
676 | nfsd4_cb_recall(dp); | |
677 | return; | |
678 | } | |
63e4863f BF |
679 | case -EBADHANDLE: |
680 | case -NFS4ERR_BAD_STATEID: | |
681 | /* Race: client probably got cb_recall | |
682 | * before open reply granting delegation */ | |
683 | break; | |
684 | default: | |
685 | /* success, or error we can't handle */ | |
227f98d9 | 686 | return; |
63e4863f BF |
687 | } |
688 | if (dp->dl_retries--) { | |
689 | rpc_delay(task, 2*HZ); | |
690 | task->tk_status = 0; | |
691 | rpc_restart_call(task); | |
0421b5c5 | 692 | return; |
63e4863f | 693 | } else { |
2bf23875 | 694 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f BF |
695 | warn_no_callback_path(clp, task->tk_status); |
696 | } | |
697 | } | |
698 | ||
699 | static void nfsd4_cb_recall_release(void *calldata) | |
700 | { | |
701 | struct nfs4_delegation *dp = calldata; | |
63e4863f BF |
702 | |
703 | nfs4_put_delegation(dp); | |
63e4863f BF |
704 | } |
705 | ||
706 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 707 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
708 | .rpc_call_done = nfsd4_cb_recall_done, |
709 | .rpc_release = nfsd4_cb_recall_release, | |
710 | }; | |
711 | ||
b5a1a81e BF |
712 | static struct workqueue_struct *callback_wq; |
713 | ||
714 | int nfsd4_create_callback_queue(void) | |
715 | { | |
716 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
717 | if (!callback_wq) | |
718 | return -ENOMEM; | |
719 | return 0; | |
720 | } | |
721 | ||
722 | void nfsd4_destroy_callback_queue(void) | |
723 | { | |
724 | destroy_workqueue(callback_wq); | |
725 | } | |
726 | ||
ab707e15 | 727 | /* must be called under the state lock */ |
4b21d0de | 728 | void nfsd4_set_callback_client(struct nfs4_client *clp, struct rpc_clnt *new) |
b5a1a81e | 729 | { |
2bf23875 | 730 | struct rpc_clnt *old = clp->cl_cb_client; |
b5a1a81e | 731 | |
2bf23875 | 732 | clp->cl_cb_client = new; |
b5a1a81e | 733 | /* |
2bf23875 | 734 | * After this, any work that saw the old value of cl_cb_client will |
b5a1a81e BF |
735 | * be gone: |
736 | */ | |
737 | flush_workqueue(callback_wq); | |
738 | /* So we can safely shut it down: */ | |
739 | if (old) | |
740 | rpc_shutdown_client(old); | |
741 | } | |
742 | ||
1da177e4 LT |
743 | /* |
744 | * called with dp->dl_count inc'ed. | |
1da177e4 | 745 | */ |
b5a1a81e | 746 | static void _nfsd4_cb_recall(struct nfs4_delegation *dp) |
1da177e4 LT |
747 | { |
748 | struct nfs4_client *clp = dp->dl_client; | |
2bf23875 | 749 | struct rpc_clnt *clnt = clp->cl_cb_client; |
227f98d9 | 750 | struct nfs4_rpc_args *args = &dp->dl_recall.cb_args; |
1da177e4 LT |
751 | struct rpc_message msg = { |
752 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
80fc015b | 753 | .rpc_cred = callback_cred |
1da177e4 | 754 | }; |
227f98d9 | 755 | int status; |
1da177e4 | 756 | |
b5a1a81e BF |
757 | if (clnt == NULL) |
758 | return; /* Client is shutting down; give up. */ | |
759 | ||
0421b5c5 RL |
760 | args->args_op = dp; |
761 | msg.rpc_argp = args; | |
3aea09dc | 762 | dp->dl_retries = 1; |
63e4863f BF |
763 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
764 | &nfsd4_cb_recall_ops, dp); | |
b12a05cb | 765 | if (status) |
63e4863f | 766 | nfs4_put_delegation(dp); |
1da177e4 | 767 | } |
b5a1a81e BF |
768 | |
769 | void nfsd4_do_callback_rpc(struct work_struct *w) | |
770 | { | |
771 | /* XXX: for now, just send off delegation recall. */ | |
772 | /* In future, generalize to handle any sort of callback. */ | |
773 | struct nfsd4_callback *c = container_of(w, struct nfsd4_callback, cb_work); | |
774 | struct nfs4_delegation *dp = container_of(c, struct nfs4_delegation, dl_recall); | |
775 | ||
776 | _nfsd4_cb_recall(dp); | |
777 | } | |
778 | ||
779 | ||
780 | void nfsd4_cb_recall(struct nfs4_delegation *dp) | |
781 | { | |
782 | queue_work(callback_wq, &dp->dl_recall.cb_work); | |
783 | } |