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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfsd/nfs4callback.c | |
3 | * | |
4 | * Copyright (c) 2001 The Regents of the University of Michigan. | |
5 | * All rights reserved. | |
6 | * | |
7 | * Kendrick Smith <kmsmith@umich.edu> | |
8 | * Andy Adamson <andros@umich.edu> | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * 1. Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * 2. Redistributions in binary form must reproduce the above copyright | |
17 | * notice, this list of conditions and the following disclaimer in the | |
18 | * documentation and/or other materials provided with the distribution. | |
19 | * 3. Neither the name of the University nor the names of its | |
20 | * contributors may be used to endorse or promote products derived | |
21 | * from this software without specific prior written permission. | |
22 | * | |
23 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
26 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
28 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
29 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
30 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
31 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
32 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
33 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
34 | */ | |
35 | ||
1da177e4 LT |
36 | #include <linux/module.h> |
37 | #include <linux/list.h> | |
38 | #include <linux/inet.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/delay.h> | |
e8edc6e0 | 41 | #include <linux/sched.h> |
2b47eece | 42 | #include <linux/kthread.h> |
1da177e4 LT |
43 | #include <linux/sunrpc/xdr.h> |
44 | #include <linux/sunrpc/svc.h> | |
45 | #include <linux/sunrpc/clnt.h> | |
38524ab3 | 46 | #include <linux/sunrpc/svcsock.h> |
1da177e4 LT |
47 | #include <linux/nfsd/nfsd.h> |
48 | #include <linux/nfsd/state.h> | |
49 | #include <linux/sunrpc/sched.h> | |
50 | #include <linux/nfs4.h> | |
51 | ||
52 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
53 | ||
54 | #define NFSPROC4_CB_NULL 0 | |
55 | #define NFSPROC4_CB_COMPOUND 1 | |
38524ab3 | 56 | #define NFS4_STATEID_SIZE 16 |
1da177e4 | 57 | |
1da177e4 LT |
58 | /* Index of predefined Linux callback client operations */ |
59 | ||
60 | enum { | |
4be36ca0 | 61 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 62 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 63 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
64 | }; |
65 | ||
66 | enum nfs_cb_opnum4 { | |
67 | OP_CB_RECALL = 4, | |
38524ab3 | 68 | OP_CB_SEQUENCE = 11, |
1da177e4 LT |
69 | }; |
70 | ||
71 | #define NFS4_MAXTAGLEN 20 | |
72 | ||
73 | #define NFS4_enc_cb_null_sz 0 | |
74 | #define NFS4_dec_cb_null_sz 0 | |
75 | #define cb_compound_enc_hdr_sz 4 | |
76 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
77 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
78 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
79 | 1 /* no referring calls list yet */) | |
80 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
81 | ||
1da177e4 LT |
82 | #define op_enc_sz 1 |
83 | #define op_dec_sz 2 | |
84 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 85 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 86 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 87 | cb_sequence_enc_sz + \ |
1da177e4 LT |
88 | 1 + enc_stateid_sz + \ |
89 | enc_nfs4_fh_sz) | |
90 | ||
91 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 92 | cb_sequence_dec_sz + \ |
1da177e4 LT |
93 | op_dec_sz) |
94 | ||
132f9771 RL |
95 | struct nfs4_rpc_args { |
96 | void *args_op; | |
97 | struct nfsd4_cb_sequence args_seq; | |
98 | }; | |
99 | ||
1da177e4 LT |
100 | /* |
101 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
102 | */ | |
f00f328f AV |
103 | static inline __be32 * |
104 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
105 | { |
106 | int tmp = XDR_QUADLEN(nbytes); | |
107 | if (!tmp) | |
108 | return p; | |
109 | p[tmp-1] = 0; | |
110 | memcpy(p, ptr, nbytes); | |
111 | return p + tmp; | |
112 | } | |
113 | ||
114 | #define WRITE32(n) *p++ = htonl(n) | |
115 | #define WRITEMEM(ptr,nbytes) do { \ | |
116 | p = xdr_writemem(p, ptr, nbytes); \ | |
117 | } while (0) | |
118 | #define RESERVE_SPACE(nbytes) do { \ | |
119 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 120 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
121 | BUG_ON(!p); \ |
122 | } while (0) | |
123 | ||
124 | /* | |
125 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
126 | */ | |
127 | #define DECODE_TAIL \ | |
128 | status = 0; \ | |
129 | out: \ | |
130 | return status; \ | |
131 | xdr_error: \ | |
132 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
133 | status = -EIO; \ | |
134 | goto out | |
135 | ||
136 | #define READ32(x) (x) = ntohl(*p++) | |
137 | #define READ64(x) do { \ | |
138 | (x) = (u64)ntohl(*p++) << 32; \ | |
139 | (x) |= ntohl(*p++); \ | |
140 | } while (0) | |
141 | #define READTIME(x) do { \ | |
142 | p++; \ | |
143 | (x.tv_sec) = ntohl(*p++); \ | |
144 | (x.tv_nsec) = ntohl(*p++); \ | |
145 | } while (0) | |
146 | #define READ_BUF(nbytes) do { \ | |
147 | p = xdr_inline_decode(xdr, nbytes); \ | |
148 | if (!p) { \ | |
3e3b4800 | 149 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 150 | __func__, __LINE__); \ |
1da177e4 LT |
151 | return -EIO; \ |
152 | } \ | |
153 | } while (0) | |
154 | ||
155 | struct nfs4_cb_compound_hdr { | |
38524ab3 AA |
156 | /* args */ |
157 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 158 | u32 nops; |
ef52bff8 | 159 | __be32 *nops_p; |
ab52ae6d | 160 | u32 minorversion; |
38524ab3 AA |
161 | /* res */ |
162 | int status; | |
1da177e4 | 163 | u32 taglen; |
ef52bff8 | 164 | char *tag; |
1da177e4 LT |
165 | }; |
166 | ||
167 | static struct { | |
168 | int stat; | |
169 | int errno; | |
170 | } nfs_cb_errtbl[] = { | |
171 | { NFS4_OK, 0 }, | |
172 | { NFS4ERR_PERM, EPERM }, | |
173 | { NFS4ERR_NOENT, ENOENT }, | |
174 | { NFS4ERR_IO, EIO }, | |
175 | { NFS4ERR_NXIO, ENXIO }, | |
176 | { NFS4ERR_ACCESS, EACCES }, | |
177 | { NFS4ERR_EXIST, EEXIST }, | |
178 | { NFS4ERR_XDEV, EXDEV }, | |
179 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
180 | { NFS4ERR_ISDIR, EISDIR }, | |
181 | { NFS4ERR_INVAL, EINVAL }, | |
182 | { NFS4ERR_FBIG, EFBIG }, | |
183 | { NFS4ERR_NOSPC, ENOSPC }, | |
184 | { NFS4ERR_ROFS, EROFS }, | |
185 | { NFS4ERR_MLINK, EMLINK }, | |
186 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
187 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
188 | { NFS4ERR_DQUOT, EDQUOT }, | |
189 | { NFS4ERR_STALE, ESTALE }, | |
190 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
191 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
192 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
193 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
194 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
195 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
196 | { NFS4ERR_LOCKED, EAGAIN }, | |
197 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
198 | { NFS4ERR_SYMLINK, ELOOP }, | |
199 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
200 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
201 | { -1, EIO } | |
202 | }; | |
203 | ||
204 | static int | |
205 | nfs_cb_stat_to_errno(int stat) | |
206 | { | |
207 | int i; | |
208 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
209 | if (nfs_cb_errtbl[i].stat == stat) | |
210 | return nfs_cb_errtbl[i].errno; | |
211 | } | |
212 | /* If we cannot translate the error, the recovery routines should | |
213 | * handle it. | |
214 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
215 | * not conflict with native Linux error codes. | |
216 | */ | |
217 | return stat; | |
218 | } | |
219 | ||
220 | /* | |
221 | * XDR encode | |
222 | */ | |
223 | ||
ef52bff8 | 224 | static void |
1da177e4 LT |
225 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
226 | { | |
f00f328f | 227 | __be32 * p; |
1da177e4 LT |
228 | |
229 | RESERVE_SPACE(16); | |
230 | WRITE32(0); /* tag length is always 0 */ | |
ab52ae6d | 231 | WRITE32(hdr->minorversion); |
1da177e4 | 232 | WRITE32(hdr->ident); |
ef52bff8 | 233 | hdr->nops_p = p; |
1da177e4 | 234 | WRITE32(hdr->nops); |
1da177e4 LT |
235 | } |
236 | ||
ef52bff8 AA |
237 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
238 | { | |
239 | *hdr->nops_p = htonl(hdr->nops); | |
240 | } | |
241 | ||
242 | static void | |
243 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, | |
244 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 245 | { |
f00f328f | 246 | __be32 *p; |
b53d40c5 | 247 | int len = dp->dl_fh.fh_size; |
1da177e4 | 248 | |
b53d40c5 | 249 | RESERVE_SPACE(12+sizeof(dp->dl_stateid) + len); |
1da177e4 | 250 | WRITE32(OP_CB_RECALL); |
b53d40c5 BF |
251 | WRITE32(dp->dl_stateid.si_generation); |
252 | WRITEMEM(&dp->dl_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
6707bd3d | 253 | WRITE32(0); /* truncate optimization not implemented */ |
1da177e4 | 254 | WRITE32(len); |
b53d40c5 | 255 | WRITEMEM(&dp->dl_fh.fh_base, len); |
ef52bff8 | 256 | hdr->nops++; |
1da177e4 LT |
257 | } |
258 | ||
2af73580 BH |
259 | static void |
260 | encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, | |
261 | struct nfs4_cb_compound_hdr *hdr) | |
262 | { | |
263 | __be32 *p; | |
264 | ||
265 | if (hdr->minorversion == 0) | |
266 | return; | |
267 | ||
268 | RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); | |
269 | ||
270 | WRITE32(OP_CB_SEQUENCE); | |
271 | WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); | |
272 | WRITE32(args->cbs_clp->cl_cb_seq_nr); | |
273 | WRITE32(0); /* slotid, always 0 */ | |
274 | WRITE32(0); /* highest slotid always 0 */ | |
275 | WRITE32(0); /* cachethis always 0 */ | |
276 | WRITE32(0); /* FIXME: support referring_call_lists */ | |
277 | hdr->nops++; | |
278 | } | |
279 | ||
1da177e4 | 280 | static int |
f00f328f | 281 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
282 | { |
283 | struct xdr_stream xdrs, *xdr = &xdrs; | |
284 | ||
285 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
286 | RESERVE_SPACE(0); | |
287 | return 0; | |
288 | } | |
289 | ||
290 | static int | |
b53d40c5 | 291 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args) |
1da177e4 LT |
292 | { |
293 | struct xdr_stream xdr; | |
294 | struct nfs4_cb_compound_hdr hdr = { | |
b53d40c5 | 295 | .ident = args->dl_ident, |
1da177e4 LT |
296 | }; |
297 | ||
298 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
299 | encode_cb_compound_hdr(&xdr, &hdr); | |
ef52bff8 AA |
300 | encode_cb_recall(&xdr, args, &hdr); |
301 | encode_cb_nops(&hdr); | |
302 | return 0; | |
1da177e4 LT |
303 | } |
304 | ||
305 | ||
306 | static int | |
307 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 308 | __be32 *p; |
1da177e4 LT |
309 | |
310 | READ_BUF(8); | |
311 | READ32(hdr->status); | |
312 | READ32(hdr->taglen); | |
313 | READ_BUF(hdr->taglen + 4); | |
314 | hdr->tag = (char *)p; | |
315 | p += XDR_QUADLEN(hdr->taglen); | |
316 | READ32(hdr->nops); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static int | |
321 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
322 | { | |
f00f328f | 323 | __be32 *p; |
1da177e4 LT |
324 | u32 op; |
325 | int32_t nfserr; | |
326 | ||
327 | READ_BUF(8); | |
328 | READ32(op); | |
329 | if (op != expected) { | |
330 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
331 | " operation %d but we issued a request for %d\n", | |
332 | op, expected); | |
333 | return -EIO; | |
334 | } | |
335 | READ32(nfserr); | |
336 | if (nfserr != NFS_OK) | |
337 | return -nfs_cb_stat_to_errno(nfserr); | |
338 | return 0; | |
339 | } | |
340 | ||
2af73580 BH |
341 | /* |
342 | * Our current back channel implmentation supports a single backchannel | |
343 | * with a single slot. | |
344 | */ | |
345 | static int | |
346 | decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, | |
347 | struct rpc_rqst *rqstp) | |
348 | { | |
349 | struct nfs4_sessionid id; | |
350 | int status; | |
351 | u32 dummy; | |
352 | __be32 *p; | |
353 | ||
354 | if (res->cbs_minorversion == 0) | |
355 | return 0; | |
356 | ||
357 | status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); | |
358 | if (status) | |
359 | return status; | |
360 | ||
361 | /* | |
362 | * If the server returns different values for sessionID, slotID or | |
363 | * sequence number, the server is looney tunes. | |
364 | */ | |
365 | status = -ESERVERFAULT; | |
366 | ||
367 | READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); | |
368 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
369 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
370 | if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, | |
371 | NFS4_MAX_SESSIONID_LEN)) { | |
372 | dprintk("%s Invalid session id\n", __func__); | |
373 | goto out; | |
374 | } | |
375 | READ32(dummy); | |
376 | if (dummy != res->cbs_clp->cl_cb_seq_nr) { | |
377 | dprintk("%s Invalid sequence number\n", __func__); | |
378 | goto out; | |
379 | } | |
380 | READ32(dummy); /* slotid must be 0 */ | |
381 | if (dummy != 0) { | |
382 | dprintk("%s Invalid slotid\n", __func__); | |
383 | goto out; | |
384 | } | |
385 | /* FIXME: process highest slotid and target highest slotid */ | |
386 | status = 0; | |
387 | out: | |
388 | return status; | |
389 | } | |
390 | ||
391 | ||
1da177e4 | 392 | static int |
f00f328f | 393 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
394 | { |
395 | return 0; | |
396 | } | |
397 | ||
398 | static int | |
f00f328f | 399 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
400 | { |
401 | struct xdr_stream xdr; | |
402 | struct nfs4_cb_compound_hdr hdr; | |
403 | int status; | |
404 | ||
405 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
406 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
407 | if (status) | |
408 | goto out; | |
409 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); | |
410 | out: | |
411 | return status; | |
412 | } | |
413 | ||
414 | /* | |
415 | * RPC procedure tables | |
416 | */ | |
1da177e4 LT |
417 | #define PROC(proc, call, argtype, restype) \ |
418 | [NFSPROC4_CLNT_##proc] = { \ | |
419 | .p_proc = NFSPROC4_CB_##call, \ | |
420 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
421 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
422 | .p_arglen = NFS4_##argtype##_sz, \ |
423 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
424 | .p_statidx = NFSPROC4_CB_##call, \ |
425 | .p_name = #proc, \ | |
1da177e4 LT |
426 | } |
427 | ||
fd39ca9a | 428 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
429 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
430 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
431 | }; | |
432 | ||
fd39ca9a | 433 | static struct rpc_version nfs_cb_version4 = { |
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[] = { | |
440 | NULL, | |
441 | &nfs_cb_version4, | |
442 | }; | |
443 | ||
ff7d9756 OK |
444 | static struct rpc_program cb_program; |
445 | ||
446 | static struct rpc_stat cb_stats = { | |
447 | .program = &cb_program | |
448 | }; | |
449 | ||
450 | #define NFS4_CALLBACK 0x40000000 | |
451 | static struct rpc_program cb_program = { | |
452 | .name = "nfs4_cb", | |
453 | .number = NFS4_CALLBACK, | |
454 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
455 | .version = nfs_cb_version, | |
456 | .stats = &cb_stats, | |
61054b14 | 457 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
458 | }; |
459 | ||
595947ac BF |
460 | static int max_cb_time(void) |
461 | { | |
462 | return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ; | |
463 | } | |
464 | ||
2b47eece BF |
465 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
466 | * And why is cb_set an atomic? */ | |
467 | ||
e1cab5a5 | 468 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 469 | { |
c237dc03 | 470 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 471 | struct rpc_timeout timeparms = { |
595947ac BF |
472 | .to_initval = max_cb_time(), |
473 | .to_retries = 0, | |
ae5c7947 | 474 | }; |
ae5c7947 CL |
475 | struct rpc_create_args args = { |
476 | .protocol = IPPROTO_TCP, | |
aa9a4ec7 JL |
477 | .address = (struct sockaddr *) &cb->cb_addr, |
478 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 479 | .timeout = &timeparms, |
ff7d9756 | 480 | .program = &cb_program, |
d5b337b4 | 481 | .prognumber = cb->cb_prog, |
ae5c7947 | 482 | .version = nfs_cb_version[1]->number, |
61054b14 | 483 | .authflavor = clp->cl_flavor, |
b6b6152c | 484 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 485 | .client_name = clp->cl_principal, |
ae5c7947 | 486 | }; |
63c86716 | 487 | struct rpc_clnt *client; |
1da177e4 | 488 | |
418cd20a | 489 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 490 | return -EINVAL; |
608207e8 | 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 | { |
80fc015b BF |
529 | callback_cred = rpc_lookup_machine_cred(); |
530 | if (!callback_cred) | |
531 | return -ENOMEM; | |
532 | return 0; | |
3cef9ab2 BF |
533 | } |
534 | ||
80fc015b | 535 | |
e300a63c | 536 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 537 | { |
c237dc03 | 538 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
a601caed BF |
539 | struct rpc_message msg = { |
540 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
541 | .rpc_argp = clp, | |
80fc015b | 542 | .rpc_cred = callback_cred |
a601caed | 543 | }; |
a601caed BF |
544 | int status; |
545 | ||
e300a63c BF |
546 | status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT, |
547 | &nfsd4_cb_probe_ops, (void *)clp); | |
e300a63c | 548 | if (status) { |
ecdd03b7 | 549 | warn_no_callback_path(clp, status); |
e300a63c BF |
550 | put_nfs4_client(clp); |
551 | } | |
63c86716 BF |
552 | } |
553 | ||
554 | /* | |
555 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
556 | */ | |
557 | void | |
558 | nfsd4_probe_callback(struct nfs4_client *clp) | |
559 | { | |
ecdd03b7 | 560 | int status; |
63c86716 | 561 | |
c237dc03 | 562 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
63c86716 | 563 | |
ecdd03b7 BF |
564 | status = setup_callback_client(clp); |
565 | if (status) { | |
566 | warn_no_callback_path(clp, status); | |
567 | return; | |
568 | } | |
569 | ||
541e0e09 | 570 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
571 | atomic_inc(&clp->cl_count); |
572 | ||
e300a63c | 573 | do_probe_callback(clp); |
1da177e4 LT |
574 | } |
575 | ||
2a1d1b59 RL |
576 | /* |
577 | * There's currently a single callback channel slot. | |
578 | * If the slot is available, then mark it busy. Otherwise, set the | |
579 | * thread for sleeping on the callback RPC wait queue. | |
580 | */ | |
581 | static int nfsd41_cb_setup_sequence(struct nfs4_client *clp, | |
582 | struct rpc_task *task) | |
583 | { | |
584 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
585 | u32 *ptr = (u32 *)clp->cl_sessionid.data; | |
586 | int status = 0; | |
587 | ||
588 | dprintk("%s: %u:%u:%u:%u\n", __func__, | |
589 | ptr[0], ptr[1], ptr[2], ptr[3]); | |
590 | ||
591 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
592 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
593 | dprintk("%s slot is busy\n", __func__); | |
594 | status = -EAGAIN; | |
595 | goto out; | |
596 | } | |
597 | ||
598 | /* | |
599 | * We'll need the clp during XDR encoding and decoding, | |
600 | * and the sequence during decoding to verify the reply | |
601 | */ | |
602 | args->args_seq.cbs_clp = clp; | |
603 | task->tk_msg.rpc_resp = &args->args_seq; | |
604 | ||
605 | out: | |
606 | dprintk("%s status=%d\n", __func__, status); | |
607 | return status; | |
608 | } | |
609 | ||
610 | /* | |
611 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
612 | * slots, and mark callback channel down on communication errors. | |
613 | */ | |
614 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
615 | { | |
616 | struct nfs4_delegation *dp = calldata; | |
617 | struct nfs4_client *clp = dp->dl_client; | |
618 | struct nfs4_rpc_args *args = task->tk_msg.rpc_argp; | |
619 | u32 minorversion = clp->cl_cb_conn.cb_minorversion; | |
620 | int status = 0; | |
621 | ||
622 | args->args_seq.cbs_minorversion = minorversion; | |
623 | if (minorversion) { | |
624 | status = nfsd41_cb_setup_sequence(clp, task); | |
625 | if (status) { | |
626 | if (status != -EAGAIN) { | |
627 | /* terminate rpc task */ | |
628 | task->tk_status = status; | |
629 | task->tk_action = NULL; | |
630 | } | |
631 | return; | |
632 | } | |
633 | } | |
634 | rpc_call_start(task); | |
635 | } | |
636 | ||
63e4863f BF |
637 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
638 | { | |
639 | struct nfs4_delegation *dp = calldata; | |
640 | struct nfs4_client *clp = dp->dl_client; | |
641 | ||
642 | switch (task->tk_status) { | |
643 | case -EIO: | |
644 | /* Network partition? */ | |
645 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
646 | warn_no_callback_path(clp, task->tk_status); | |
647 | case -EBADHANDLE: | |
648 | case -NFS4ERR_BAD_STATEID: | |
649 | /* Race: client probably got cb_recall | |
650 | * before open reply granting delegation */ | |
651 | break; | |
652 | default: | |
653 | /* success, or error we can't handle */ | |
654 | return; | |
655 | } | |
656 | if (dp->dl_retries--) { | |
657 | rpc_delay(task, 2*HZ); | |
658 | task->tk_status = 0; | |
659 | rpc_restart_call(task); | |
660 | } else { | |
661 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
662 | warn_no_callback_path(clp, task->tk_status); | |
663 | } | |
664 | } | |
665 | ||
666 | static void nfsd4_cb_recall_release(void *calldata) | |
667 | { | |
668 | struct nfs4_delegation *dp = calldata; | |
669 | struct nfs4_client *clp = dp->dl_client; | |
670 | ||
671 | nfs4_put_delegation(dp); | |
672 | put_nfs4_client(clp); | |
673 | } | |
674 | ||
675 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 676 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
677 | .rpc_call_done = nfsd4_cb_recall_done, |
678 | .rpc_release = nfsd4_cb_recall_release, | |
679 | }; | |
680 | ||
1da177e4 LT |
681 | /* |
682 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
683 | */ |
684 | void | |
685 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
686 | { | |
687 | struct nfs4_client *clp = dp->dl_client; | |
c237dc03 | 688 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
1da177e4 LT |
689 | struct rpc_message msg = { |
690 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
b53d40c5 | 691 | .rpc_argp = dp, |
80fc015b | 692 | .rpc_cred = callback_cred |
1da177e4 | 693 | }; |
63e4863f | 694 | int status; |
1da177e4 | 695 | |
3aea09dc | 696 | dp->dl_retries = 1; |
63e4863f BF |
697 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
698 | &nfsd4_cb_recall_ops, dp); | |
699 | if (status) { | |
700 | put_nfs4_client(clp); | |
701 | nfs4_put_delegation(dp); | |
1da177e4 | 702 | } |
1da177e4 | 703 | } |