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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> |
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 | ||
82 | /* | |
83 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
84 | */ | |
f00f328f AV |
85 | static inline __be32 * |
86 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
87 | { |
88 | int tmp = XDR_QUADLEN(nbytes); | |
89 | if (!tmp) | |
90 | return p; | |
91 | p[tmp-1] = 0; | |
92 | memcpy(p, ptr, nbytes); | |
93 | return p + tmp; | |
94 | } | |
95 | ||
96 | #define WRITE32(n) *p++ = htonl(n) | |
97 | #define WRITEMEM(ptr,nbytes) do { \ | |
98 | p = xdr_writemem(p, ptr, nbytes); \ | |
99 | } while (0) | |
100 | #define RESERVE_SPACE(nbytes) do { \ | |
101 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 102 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
103 | BUG_ON(!p); \ |
104 | } while (0) | |
105 | ||
106 | /* | |
107 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
108 | */ | |
109 | #define DECODE_TAIL \ | |
110 | status = 0; \ | |
111 | out: \ | |
112 | return status; \ | |
113 | xdr_error: \ | |
114 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
115 | status = -EIO; \ | |
116 | goto out | |
117 | ||
118 | #define READ32(x) (x) = ntohl(*p++) | |
119 | #define READ64(x) do { \ | |
120 | (x) = (u64)ntohl(*p++) << 32; \ | |
121 | (x) |= ntohl(*p++); \ | |
122 | } while (0) | |
123 | #define READTIME(x) do { \ | |
124 | p++; \ | |
125 | (x.tv_sec) = ntohl(*p++); \ | |
126 | (x.tv_nsec) = ntohl(*p++); \ | |
127 | } while (0) | |
128 | #define READ_BUF(nbytes) do { \ | |
129 | p = xdr_inline_decode(xdr, nbytes); \ | |
130 | if (!p) { \ | |
3e3b4800 | 131 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 132 | __func__, __LINE__); \ |
1da177e4 LT |
133 | return -EIO; \ |
134 | } \ | |
135 | } while (0) | |
136 | ||
137 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
138 | /* args */ |
139 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 140 | u32 nops; |
ef52bff8 | 141 | __be32 *nops_p; |
ab52ae6d | 142 | u32 minorversion; |
38524ab3 AA |
143 | /* res */ |
144 | int status; | |
1da177e4 | 145 | u32 taglen; |
ef52bff8 | 146 | char *tag; |
1da177e4 LT |
147 | }; |
148 | ||
149 | static struct { | |
150 | int stat; | |
151 | int errno; | |
152 | } nfs_cb_errtbl[] = { | |
153 | { NFS4_OK, 0 }, | |
154 | { NFS4ERR_PERM, EPERM }, | |
155 | { NFS4ERR_NOENT, ENOENT }, | |
156 | { NFS4ERR_IO, EIO }, | |
157 | { NFS4ERR_NXIO, ENXIO }, | |
158 | { NFS4ERR_ACCESS, EACCES }, | |
159 | { NFS4ERR_EXIST, EEXIST }, | |
160 | { NFS4ERR_XDEV, EXDEV }, | |
161 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
162 | { NFS4ERR_ISDIR, EISDIR }, | |
163 | { NFS4ERR_INVAL, EINVAL }, | |
164 | { NFS4ERR_FBIG, EFBIG }, | |
165 | { NFS4ERR_NOSPC, ENOSPC }, | |
166 | { NFS4ERR_ROFS, EROFS }, | |
167 | { NFS4ERR_MLINK, EMLINK }, | |
168 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
169 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
170 | { NFS4ERR_DQUOT, EDQUOT }, | |
171 | { NFS4ERR_STALE, ESTALE }, | |
172 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
173 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
174 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
175 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
176 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
177 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
178 | { NFS4ERR_LOCKED, EAGAIN }, | |
179 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
180 | { NFS4ERR_SYMLINK, ELOOP }, | |
181 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
182 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
183 | { -1, EIO } | |
184 | }; | |
185 | ||
186 | static int | |
187 | nfs_cb_stat_to_errno(int stat) | |
188 | { | |
189 | int i; | |
190 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
191 | if (nfs_cb_errtbl[i].stat == stat) | |
192 | return nfs_cb_errtbl[i].errno; | |
193 | } | |
194 | /* If we cannot translate the error, the recovery routines should | |
195 | * handle it. | |
196 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
197 | * not conflict with native Linux error codes. | |
198 | */ | |
199 | return stat; | |
200 | } | |
201 | ||
202 | /* | |
203 | * XDR encode | |
204 | */ | |
205 | ||
ef52bff8 | 206 | static void |
1da177e4 LT |
207 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
208 | { | |
f00f328f | 209 | __be32 * p; |
1da177e4 LT |
210 | |
211 | RESERVE_SPACE(16); | |
212 | WRITE32(0); /* tag length is always 0 */ | |
ab52ae6d | 213 | WRITE32(hdr->minorversion); |
1da177e4 | 214 | WRITE32(hdr->ident); |
ef52bff8 | 215 | hdr->nops_p = p; |
1da177e4 | 216 | WRITE32(hdr->nops); |
1da177e4 LT |
217 | } |
218 | ||
ef52bff8 AA |
219 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
220 | { | |
221 | *hdr->nops_p = htonl(hdr->nops); | |
222 | } | |
223 | ||
224 | static void | |
225 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
226 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 227 | { |
f00f328f | 228 | __be32 *p; |
b53d40c5 | 229 | int len = dp->dl_fh.fh_size; |
1da177e4 | 230 | |
b53d40c5 | 231 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 232 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
233 | WRITE32(dp->dl_stateid.si_generation); |
234 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 235 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 236 | WRITE32(len); |
b53d40c5 | 237 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 238 | hdr->nops++; |
1da177e4 LT |
239 | } |
240 | ||
2af73580 BH |
241 | static void |
242 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
243 | struct nfs4_cb_compound_hdr *hdr) | |
244 | { | |
245 | __be32 *p; | |
246 | ||
247 | if (hdr->minorversion == 0) | |
248 | return; | |
249 | ||
250 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
251 | ||
252 | WRITE32(OP_CB_SEQUENCE); | |
253 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
254 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
255 | WRITE32(0); /* slotid, always 0 */ | |
256 | WRITE32(0); /* highest slotid always 0 */ | |
257 | WRITE32(0); /* cachethis always 0 */ | |
258 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
259 | hdr->nops++; | |
260 | } | |
261 | ||
1da177e4 | 262 | static int |
f00f328f | 263 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
264 | { |
265 | struct xdr_stream xdrs, *xdr = &xdrs; | |
266 | ||
267 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
268 | RESERVE_SPACE(0); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int | |
0421b5c5 RL |
273 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, |
274 | struct nfs4_rpc_args *rpc_args) | |
1da177e4 LT |
275 | { |
276 | struct xdr_stream xdr; | |
0421b5c5 | 277 | struct nfs4_delegation *args = rpc_args->args_op; |
1da177e4 | 278 | struct nfs4_cb_compound_hdr hdr = { |
b53d40c5 | 279 | .ident = args->dl_ident, |
0421b5c5 | 280 | .minorversion = rpc_args->args_seq.cbs_minorversion, |
1da177e4 LT |
281 | }; |
282 | ||
283 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
284 | encode_cb_compound_hdr(&xdr, &hdr); | |
0421b5c5 | 285 | encode_cb_sequence(&xdr, &rpc_args->args_seq, &hdr); |
ef52bff8 AA |
286 | encode_cb_recall(&xdr, args, &hdr); |
287 | encode_cb_nops(&hdr); | |
288 | return 0; | |
1da177e4 LT |
289 | } |
290 | ||
291 | ||
292 | static int | |
293 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 294 | __be32 *p; |
1da177e4 LT |
295 | |
296 | READ_BUF(8); | |
297 | READ32(hdr->status); | |
298 | READ32(hdr->taglen); | |
299 | READ_BUF(hdr->taglen + 4); | |
300 | hdr->tag = (char *)p; | |
301 | p += XDR_QUADLEN(hdr->taglen); | |
302 | READ32(hdr->nops); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static int | |
307 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
308 | { | |
f00f328f | 309 | __be32 *p; |
1da177e4 LT |
310 | u32 op; |
311 | int32_t nfserr; | |
312 | ||
313 | READ_BUF(8); | |
314 | READ32(op); | |
315 | if (op != expected) { | |
316 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
317 | " operation %d but we issued a request for %d\n", | |
318 | op, expected); | |
319 | return -EIO; | |
320 | } | |
321 | READ32(nfserr); | |
322 | if (nfserr != NFS_OK) | |
323 | return -nfs_cb_stat_to_errno(nfserr); | |
324 | return 0; | |
325 | } | |
326 | ||
2af73580 BH |
327 | /* |
328 | * Our current back channel implmentation supports a single backchannel | |
329 | * with a single slot. | |
330 | */ | |
331 | static int | |
332 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
333 | struct rpc_rqst *rqstp) | |
334 | { | |
335 | struct nfs4_sessionid id; | |
336 | int status; | |
337 | u32 dummy; | |
338 | __be32 *p; | |
339 | ||
340 | if (res->cbs_minorversion == 0) | |
341 | return 0; | |
342 | ||
343 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
344 | if (status) | |
345 | return status; | |
346 | ||
347 | /* | |
348 | * If the server returns different values for sessionID, slotID or | |
349 | * sequence number, the server is looney tunes. | |
350 | */ | |
351 | status = -ESERVERFAULT; | |
352 | ||
353 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
354 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
355 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
356 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
357 | NFS4_MAX_SESSIONID_LEN)) { | |
358 | dprintk("%s Invalid session id\n", __func__); | |
359 | goto out; | |
360 | } | |
361 | READ32(dummy); | |
362 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
363 | dprintk("%s Invalid sequence number\n", __func__); | |
364 | goto out; | |
365 | } | |
366 | READ32(dummy); /* slotid must be 0 */ | |
367 | if (dummy != 0) { | |
368 | dprintk("%s Invalid slotid\n", __func__); | |
369 | goto out; | |
370 | } | |
371 | /* FIXME: process highest slotid and target highest slotid */ | |
372 | status = 0; | |
373 | out: | |
374 | return status; | |
375 | } | |
376 | ||
377 | ||
1da177e4 | 378 | static int |
f00f328f | 379 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
380 | { |
381 | return 0; | |
382 | } | |
383 | ||
384 | static int | |
0421b5c5 RL |
385 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p, |
386 | struct nfsd4_cb_sequence *seq) | |
1da177e4 LT |
387 | { |
388 | struct xdr_stream xdr; | |
389 | struct nfs4_cb_compound_hdr hdr; | |
390 | int status; | |
391 | ||
392 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
393 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
394 | if (status) | |
395 | goto out; | |
0421b5c5 RL |
396 | if (seq) { |
397 | status = decode_cb_sequence(&xdr, seq, rqstp); | |
398 | if (status) | |
399 | goto out; | |
400 | } | |
1da177e4 LT |
401 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); |
402 | out: | |
403 | return status; | |
404 | } | |
405 | ||
406 | /* | |
407 | * RPC procedure tables | |
408 | */ | |
1da177e4 LT |
409 | #define PROC(proc, call, argtype, restype) \ |
410 | [NFSPROC4_CLNT_##proc] = { \ | |
411 | .p_proc = NFSPROC4_CB_##call, \ | |
412 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
413 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
414 | .p_arglen = NFS4_##argtype##_sz, \ |
415 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
416 | .p_statidx = NFSPROC4_CB_##call, \ |
417 | .p_name = #proc, \ | |
1da177e4 LT |
418 | } |
419 | ||
fd39ca9a | 420 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
421 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
422 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
423 | }; | |
424 | ||
fd39ca9a | 425 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 426 | .number = 1, |
e8c96f8c | 427 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
428 | .procs = nfs4_cb_procedures |
429 | }; | |
430 | ||
431 | static struct rpc_version * nfs_cb_version[] = { | |
432 | NULL, | |
433 | &nfs_cb_version4, | |
434 | }; | |
435 | ||
ff7d9756 OK |
436 | static struct rpc_program cb_program; |
437 | ||
438 | static struct rpc_stat cb_stats = { | |
439 | .program = &cb_program | |
440 | }; | |
441 | ||
442 | #define NFS4_CALLBACK 0x40000000 | |
443 | static struct rpc_program cb_program = { | |
444 | .name = "nfs4_cb", | |
445 | .number = NFS4_CALLBACK, | |
446 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
447 | .version = nfs_cb_version, | |
448 | .stats = &cb_stats, | |
61054b14 | 449 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
450 | }; |
451 | ||
595947ac BF |
452 | static int max_cb_time(void) |
453 | { | |
cf07d2ea | 454 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
455 | } |
456 | ||
2b47eece | 457 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
2bf23875 | 458 | * And why is cl_cb_set an atomic? */ |
2b47eece | 459 | |
e1cab5a5 | 460 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 461 | { |
c237dc03 | 462 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 463 | struct rpc_timeout timeparms = { |
595947ac BF |
464 | .to_initval = max_cb_time(), |
465 | .to_retries = 0, | |
ae5c7947 | 466 | }; |
ae5c7947 | 467 | struct rpc_create_args args = { |
3ddc8bf5 | 468 | .protocol = XPRT_TRANSPORT_TCP, |
aa9a4ec7 JL |
469 | .address = (struct sockaddr *) &cb->cb_addr, |
470 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 471 | .timeout = &timeparms, |
ff7d9756 | 472 | .program = &cb_program, |
d5b337b4 | 473 | .prognumber = cb->cb_prog, |
ae5c7947 | 474 | .version = nfs_cb_version[1]->number, |
61054b14 | 475 | .authflavor = clp->cl_flavor, |
b6b6152c | 476 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 477 | .client_name = clp->cl_principal, |
ae5c7947 | 478 | }; |
63c86716 | 479 | struct rpc_clnt *client; |
1da177e4 | 480 | |
418cd20a | 481 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 482 | return -EINVAL; |
3ddc8bf5 | 483 | if (cb->cb_minorversion) { |
2bf23875 | 484 | args.bc_xprt = clp->cl_cb_conn.cb_xprt; |
3ddc8bf5 AB |
485 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
486 | } | |
ae5c7947 | 487 | /* Create RPC client */ |
63c86716 | 488 | client = rpc_create(&args); |
e1cab5a5 | 489 | if (IS_ERR(client)) { |
a601caed BF |
490 | dprintk("NFSD: couldn't create callback client: %ld\n", |
491 | PTR_ERR(client)); | |
e1cab5a5 BF |
492 | return PTR_ERR(client); |
493 | } | |
2bf23875 | 494 | clp->cl_cb_client = client; |
e1cab5a5 | 495 | return 0; |
a601caed BF |
496 | |
497 | } | |
498 | ||
ecdd03b7 BF |
499 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
500 | { | |
501 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
502 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
503 | } | |
504 | ||
e300a63c BF |
505 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
506 | { | |
507 | struct nfs4_client *clp = calldata; | |
508 | ||
509 | if (task->tk_status) | |
510 | warn_no_callback_path(clp, task->tk_status); | |
511 | else | |
2bf23875 | 512 | atomic_set(&clp->cl_cb_set, 1); |
e300a63c BF |
513 | } |
514 | ||
515 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
516 | .rpc_call_done = nfsd4_cb_probe_done, | |
517 | }; | |
518 | ||
80fc015b BF |
519 | static struct rpc_cred *callback_cred; |
520 | ||
521 | int set_callback_cred(void) | |
3cef9ab2 | 522 | { |
8d75da8a BF |
523 | if (callback_cred) |
524 | return 0; | |
80fc015b BF |
525 | callback_cred = rpc_lookup_machine_cred(); |
526 | if (!callback_cred) | |
527 | return -ENOMEM; | |
528 | return 0; | |
3cef9ab2 BF |
529 | } |
530 | ||
80fc015b | 531 | |
e300a63c | 532 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 533 | { |
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 | ||
2bf23875 | 541 | status = rpc_call_async(clp->cl_cb_client, &msg, |
58255a4e | 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 | |
2bf23875 | 556 | BUG_ON(atomic_read(&clp->cl_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? */ | |
2bf23875 | 658 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f BF |
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 | 674 | } else { |
2bf23875 | 675 | atomic_set(&clp->cl_cb_set, 0); |
63e4863f BF |
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; | |
63e4863f BF |
683 | |
684 | nfs4_put_delegation(dp); | |
63e4863f BF |
685 | } |
686 | ||
687 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 688 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
689 | .rpc_call_done = nfsd4_cb_recall_done, |
690 | .rpc_release = nfsd4_cb_recall_release, | |
691 | }; | |
692 | ||
b5a1a81e BF |
693 | static struct workqueue_struct *callback_wq; |
694 | ||
695 | int nfsd4_create_callback_queue(void) | |
696 | { | |
697 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
698 | if (!callback_wq) | |
699 | return -ENOMEM; | |
700 | return 0; | |
701 | } | |
702 | ||
703 | void nfsd4_destroy_callback_queue(void) | |
704 | { | |
705 | destroy_workqueue(callback_wq); | |
706 | } | |
707 | ||
708 | void nfsd4_set_callback_client(struct nfs4_client *clp, struct rpc_clnt | |
709 | *new) | |
710 | { | |
2bf23875 | 711 | struct rpc_clnt *old = clp->cl_cb_client; |
b5a1a81e | 712 | |
2bf23875 | 713 | clp->cl_cb_client = new; |
b5a1a81e | 714 | /* |
2bf23875 | 715 | * After this, any work that saw the old value of cl_cb_client will |
b5a1a81e BF |
716 | * be gone: |
717 | */ | |
718 | flush_workqueue(callback_wq); | |
719 | /* So we can safely shut it down: */ | |
720 | if (old) | |
721 | rpc_shutdown_client(old); | |
722 | } | |
723 | ||
1da177e4 LT |
724 | /* |
725 | * called with dp->dl_count inc'ed. | |
1da177e4 | 726 | */ |
b5a1a81e | 727 | static void _nfsd4_cb_recall(struct nfs4_delegation *dp) |
1da177e4 LT |
728 | { |
729 | struct nfs4_client *clp = dp->dl_client; | |
2bf23875 | 730 | struct rpc_clnt *clnt = clp->cl_cb_client; |
227f98d9 | 731 | struct nfs4_rpc_args *args = &dp->dl_recall.cb_args; |
1da177e4 LT |
732 | struct rpc_message msg = { |
733 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
80fc015b | 734 | .rpc_cred = callback_cred |
1da177e4 | 735 | }; |
227f98d9 | 736 | int status; |
1da177e4 | 737 | |
b5a1a81e BF |
738 | if (clnt == NULL) |
739 | return; /* Client is shutting down; give up. */ | |
740 | ||
0421b5c5 RL |
741 | args->args_op = dp; |
742 | msg.rpc_argp = args; | |
3aea09dc | 743 | dp->dl_retries = 1; |
63e4863f BF |
744 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
745 | &nfsd4_cb_recall_ops, dp); | |
b12a05cb | 746 | if (status) |
63e4863f | 747 | nfs4_put_delegation(dp); |
1da177e4 | 748 | } |
b5a1a81e BF |
749 | |
750 | void nfsd4_do_callback_rpc(struct work_struct *w) | |
751 | { | |
752 | /* XXX: for now, just send off delegation recall. */ | |
753 | /* In future, generalize to handle any sort of callback. */ | |
754 | struct nfsd4_callback *c = container_of(w, struct nfsd4_callback, cb_work); | |
755 | struct nfs4_delegation *dp = container_of(c, struct nfs4_delegation, dl_recall); | |
756 | ||
757 | _nfsd4_cb_recall(dp); | |
758 | } | |
759 | ||
760 | ||
761 | void nfsd4_cb_recall(struct nfs4_delegation *dp) | |
762 | { | |
763 | queue_work(callback_wq, &dp->dl_recall.cb_work); | |
764 | } |