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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> | |
46 | #include <linux/nfsd/nfsd.h> | |
47 | #include <linux/nfsd/state.h> | |
48 | #include <linux/sunrpc/sched.h> | |
49 | #include <linux/nfs4.h> | |
50 | ||
51 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
52 | ||
53 | #define NFSPROC4_CB_NULL 0 | |
54 | #define NFSPROC4_CB_COMPOUND 1 | |
55 | ||
1da177e4 LT |
56 | /* Index of predefined Linux callback client operations */ |
57 | ||
58 | enum { | |
4be36ca0 | 59 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 LT |
60 | NFSPROC4_CLNT_CB_RECALL, |
61 | }; | |
62 | ||
63 | enum nfs_cb_opnum4 { | |
64 | OP_CB_RECALL = 4, | |
65 | }; | |
66 | ||
67 | #define NFS4_MAXTAGLEN 20 | |
68 | ||
69 | #define NFS4_enc_cb_null_sz 0 | |
70 | #define NFS4_dec_cb_null_sz 0 | |
71 | #define cb_compound_enc_hdr_sz 4 | |
72 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
73 | #define op_enc_sz 1 | |
74 | #define op_dec_sz 2 | |
75 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 76 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 LT |
77 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
78 | 1 + enc_stateid_sz + \ | |
79 | enc_nfs4_fh_sz) | |
80 | ||
81 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
82 | op_dec_sz) | |
83 | ||
84 | /* | |
85 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
86 | */ | |
f00f328f AV |
87 | static inline __be32 * |
88 | xdr_writemem(__be32 *p, const void *ptr, int nbytes) | |
1da177e4 LT |
89 | { |
90 | int tmp = XDR_QUADLEN(nbytes); | |
91 | if (!tmp) | |
92 | return p; | |
93 | p[tmp-1] = 0; | |
94 | memcpy(p, ptr, nbytes); | |
95 | return p + tmp; | |
96 | } | |
97 | ||
98 | #define WRITE32(n) *p++ = htonl(n) | |
99 | #define WRITEMEM(ptr,nbytes) do { \ | |
100 | p = xdr_writemem(p, ptr, nbytes); \ | |
101 | } while (0) | |
102 | #define RESERVE_SPACE(nbytes) do { \ | |
103 | p = xdr_reserve_space(xdr, nbytes); \ | |
8e24eea7 | 104 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \ |
1da177e4 LT |
105 | BUG_ON(!p); \ |
106 | } while (0) | |
107 | ||
108 | /* | |
109 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
110 | */ | |
111 | #define DECODE_TAIL \ | |
112 | status = 0; \ | |
113 | out: \ | |
114 | return status; \ | |
115 | xdr_error: \ | |
116 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
117 | status = -EIO; \ | |
118 | goto out | |
119 | ||
120 | #define READ32(x) (x) = ntohl(*p++) | |
121 | #define READ64(x) do { \ | |
122 | (x) = (u64)ntohl(*p++) << 32; \ | |
123 | (x) |= ntohl(*p++); \ | |
124 | } while (0) | |
125 | #define READTIME(x) do { \ | |
126 | p++; \ | |
127 | (x.tv_sec) = ntohl(*p++); \ | |
128 | (x.tv_nsec) = ntohl(*p++); \ | |
129 | } while (0) | |
130 | #define READ_BUF(nbytes) do { \ | |
131 | p = xdr_inline_decode(xdr, nbytes); \ | |
132 | if (!p) { \ | |
3e3b4800 | 133 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
8e24eea7 | 134 | __func__, __LINE__); \ |
1da177e4 LT |
135 | return -EIO; \ |
136 | } \ | |
137 | } while (0) | |
138 | ||
139 | struct nfs4_cb_compound_hdr { | |
140 | int status; | |
141 | u32 ident; | |
142 | u32 nops; | |
ef52bff8 | 143 | __be32 *nops_p; |
ab52ae6d | 144 | u32 minorversion; |
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 | ||
241 | static int | |
f00f328f | 242 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
243 | { |
244 | struct xdr_stream xdrs, *xdr = &xdrs; | |
245 | ||
246 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
247 | RESERVE_SPACE(0); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static int | |
b53d40c5 | 252 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_delegation *args) |
1da177e4 LT |
253 | { |
254 | struct xdr_stream xdr; | |
255 | struct nfs4_cb_compound_hdr hdr = { | |
b53d40c5 | 256 | .ident = args->dl_ident, |
1da177e4 LT |
257 | }; |
258 | ||
259 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
260 | encode_cb_compound_hdr(&xdr, &hdr); | |
ef52bff8 AA |
261 | encode_cb_recall(&xdr, args, &hdr); |
262 | encode_cb_nops(&hdr); | |
263 | return 0; | |
1da177e4 LT |
264 | } |
265 | ||
266 | ||
267 | static int | |
268 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 269 | __be32 *p; |
1da177e4 LT |
270 | |
271 | READ_BUF(8); | |
272 | READ32(hdr->status); | |
273 | READ32(hdr->taglen); | |
274 | READ_BUF(hdr->taglen + 4); | |
275 | hdr->tag = (char *)p; | |
276 | p += XDR_QUADLEN(hdr->taglen); | |
277 | READ32(hdr->nops); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | static int | |
282 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
283 | { | |
f00f328f | 284 | __be32 *p; |
1da177e4 LT |
285 | u32 op; |
286 | int32_t nfserr; | |
287 | ||
288 | READ_BUF(8); | |
289 | READ32(op); | |
290 | if (op != expected) { | |
291 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
292 | " operation %d but we issued a request for %d\n", | |
293 | op, expected); | |
294 | return -EIO; | |
295 | } | |
296 | READ32(nfserr); | |
297 | if (nfserr != NFS_OK) | |
298 | return -nfs_cb_stat_to_errno(nfserr); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | static int | |
f00f328f | 303 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
304 | { |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int | |
f00f328f | 309 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
310 | { |
311 | struct xdr_stream xdr; | |
312 | struct nfs4_cb_compound_hdr hdr; | |
313 | int status; | |
314 | ||
315 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
316 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
317 | if (status) | |
318 | goto out; | |
319 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); | |
320 | out: | |
321 | return status; | |
322 | } | |
323 | ||
324 | /* | |
325 | * RPC procedure tables | |
326 | */ | |
1da177e4 LT |
327 | #define PROC(proc, call, argtype, restype) \ |
328 | [NFSPROC4_CLNT_##proc] = { \ | |
329 | .p_proc = NFSPROC4_CB_##call, \ | |
330 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
331 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
332 | .p_arglen = NFS4_##argtype##_sz, \ |
333 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
334 | .p_statidx = NFSPROC4_CB_##call, \ |
335 | .p_name = #proc, \ | |
1da177e4 LT |
336 | } |
337 | ||
fd39ca9a | 338 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
339 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
340 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
341 | }; | |
342 | ||
fd39ca9a | 343 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 344 | .number = 1, |
e8c96f8c | 345 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
346 | .procs = nfs4_cb_procedures |
347 | }; | |
348 | ||
349 | static struct rpc_version * nfs_cb_version[] = { | |
350 | NULL, | |
351 | &nfs_cb_version4, | |
352 | }; | |
353 | ||
ff7d9756 OK |
354 | static struct rpc_program cb_program; |
355 | ||
356 | static struct rpc_stat cb_stats = { | |
357 | .program = &cb_program | |
358 | }; | |
359 | ||
360 | #define NFS4_CALLBACK 0x40000000 | |
361 | static struct rpc_program cb_program = { | |
362 | .name = "nfs4_cb", | |
363 | .number = NFS4_CALLBACK, | |
364 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
365 | .version = nfs_cb_version, | |
366 | .stats = &cb_stats, | |
61054b14 | 367 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
368 | }; |
369 | ||
595947ac BF |
370 | static int max_cb_time(void) |
371 | { | |
372 | return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ; | |
373 | } | |
374 | ||
2b47eece BF |
375 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
376 | * And why is cb_set an atomic? */ | |
377 | ||
e1cab5a5 | 378 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 379 | { |
c237dc03 | 380 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
ae5c7947 | 381 | struct rpc_timeout timeparms = { |
595947ac BF |
382 | .to_initval = max_cb_time(), |
383 | .to_retries = 0, | |
ae5c7947 | 384 | }; |
ae5c7947 CL |
385 | struct rpc_create_args args = { |
386 | .protocol = IPPROTO_TCP, | |
aa9a4ec7 JL |
387 | .address = (struct sockaddr *) &cb->cb_addr, |
388 | .addrsize = cb->cb_addrlen, | |
ae5c7947 | 389 | .timeout = &timeparms, |
ff7d9756 | 390 | .program = &cb_program, |
d5b337b4 | 391 | .prognumber = cb->cb_prog, |
ae5c7947 | 392 | .version = nfs_cb_version[1]->number, |
61054b14 | 393 | .authflavor = clp->cl_flavor, |
b6b6152c | 394 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 395 | .client_name = clp->cl_principal, |
ae5c7947 | 396 | }; |
63c86716 | 397 | struct rpc_clnt *client; |
1da177e4 | 398 | |
418cd20a | 399 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 400 | return -EINVAL; |
608207e8 | 401 | |
ae5c7947 | 402 | /* Create RPC client */ |
63c86716 | 403 | client = rpc_create(&args); |
e1cab5a5 | 404 | if (IS_ERR(client)) { |
a601caed BF |
405 | dprintk("NFSD: couldn't create callback client: %ld\n", |
406 | PTR_ERR(client)); | |
e1cab5a5 BF |
407 | return PTR_ERR(client); |
408 | } | |
409 | cb->cb_client = client; | |
410 | return 0; | |
a601caed BF |
411 | |
412 | } | |
413 | ||
ecdd03b7 BF |
414 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
415 | { | |
416 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
417 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
418 | } | |
419 | ||
e300a63c BF |
420 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
421 | { | |
422 | struct nfs4_client *clp = calldata; | |
423 | ||
424 | if (task->tk_status) | |
425 | warn_no_callback_path(clp, task->tk_status); | |
426 | else | |
c237dc03 | 427 | atomic_set(&clp->cl_cb_conn.cb_set, 1); |
e300a63c BF |
428 | put_nfs4_client(clp); |
429 | } | |
430 | ||
431 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
432 | .rpc_call_done = nfsd4_cb_probe_done, | |
433 | }; | |
434 | ||
c237dc03 | 435 | static struct rpc_cred *lookup_cb_cred(struct nfs4_cb_conn *cb) |
3cef9ab2 BF |
436 | { |
437 | struct auth_cred acred = { | |
438 | .machine_cred = 1 | |
439 | }; | |
886e3b7f | 440 | struct rpc_auth *auth = cb->cb_client->cl_auth; |
3cef9ab2 BF |
441 | |
442 | /* | |
443 | * Note in the gss case this doesn't actually have to wait for a | |
444 | * gss upcall (or any calls to the client); this just creates a | |
445 | * non-uptodate cred which the rpc state machine will fill in with | |
446 | * a refresh_upcall later. | |
447 | */ | |
886e3b7f | 448 | return auth->au_ops->lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); |
3cef9ab2 BF |
449 | } |
450 | ||
e300a63c | 451 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 452 | { |
c237dc03 | 453 | struct nfs4_cb_conn *cb = &clp->cl_cb_conn; |
a601caed BF |
454 | struct rpc_message msg = { |
455 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
456 | .rpc_argp = clp, | |
457 | }; | |
3cef9ab2 | 458 | struct rpc_cred *cred; |
a601caed BF |
459 | int status; |
460 | ||
3cef9ab2 BF |
461 | cred = lookup_cb_cred(cb); |
462 | if (IS_ERR(cred)) { | |
463 | status = PTR_ERR(cred); | |
464 | goto out; | |
465 | } | |
466 | cb->cb_cred = cred; | |
467 | msg.rpc_cred = cb->cb_cred; | |
e300a63c BF |
468 | status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT, |
469 | &nfsd4_cb_probe_ops, (void *)clp); | |
3cef9ab2 | 470 | out: |
e300a63c | 471 | if (status) { |
ecdd03b7 | 472 | warn_no_callback_path(clp, status); |
e300a63c BF |
473 | put_nfs4_client(clp); |
474 | } | |
63c86716 BF |
475 | } |
476 | ||
477 | /* | |
478 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
479 | */ | |
480 | void | |
481 | nfsd4_probe_callback(struct nfs4_client *clp) | |
482 | { | |
ecdd03b7 | 483 | int status; |
63c86716 | 484 | |
c237dc03 | 485 | BUG_ON(atomic_read(&clp->cl_cb_conn.cb_set)); |
63c86716 | 486 | |
ecdd03b7 BF |
487 | status = setup_callback_client(clp); |
488 | if (status) { | |
489 | warn_no_callback_path(clp, status); | |
490 | return; | |
491 | } | |
492 | ||
541e0e09 | 493 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
494 | atomic_inc(&clp->cl_count); |
495 | ||
e300a63c | 496 | do_probe_callback(clp); |
1da177e4 LT |
497 | } |
498 | ||
63e4863f BF |
499 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
500 | { | |
501 | struct nfs4_delegation *dp = calldata; | |
502 | struct nfs4_client *clp = dp->dl_client; | |
503 | ||
504 | switch (task->tk_status) { | |
505 | case -EIO: | |
506 | /* Network partition? */ | |
507 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
508 | warn_no_callback_path(clp, task->tk_status); | |
509 | case -EBADHANDLE: | |
510 | case -NFS4ERR_BAD_STATEID: | |
511 | /* Race: client probably got cb_recall | |
512 | * before open reply granting delegation */ | |
513 | break; | |
514 | default: | |
515 | /* success, or error we can't handle */ | |
516 | return; | |
517 | } | |
518 | if (dp->dl_retries--) { | |
519 | rpc_delay(task, 2*HZ); | |
520 | task->tk_status = 0; | |
521 | rpc_restart_call(task); | |
522 | } else { | |
523 | atomic_set(&clp->cl_cb_conn.cb_set, 0); | |
524 | warn_no_callback_path(clp, task->tk_status); | |
525 | } | |
526 | } | |
527 | ||
528 | static void nfsd4_cb_recall_release(void *calldata) | |
529 | { | |
530 | struct nfs4_delegation *dp = calldata; | |
531 | struct nfs4_client *clp = dp->dl_client; | |
532 | ||
533 | nfs4_put_delegation(dp); | |
534 | put_nfs4_client(clp); | |
535 | } | |
536 | ||
537 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
538 | .rpc_call_done = nfsd4_cb_recall_done, | |
539 | .rpc_release = nfsd4_cb_recall_release, | |
540 | }; | |
541 | ||
1da177e4 LT |
542 | /* |
543 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
544 | */ |
545 | void | |
546 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
547 | { | |
548 | struct nfs4_client *clp = dp->dl_client; | |
c237dc03 | 549 | struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client; |
1da177e4 LT |
550 | struct rpc_message msg = { |
551 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
b53d40c5 | 552 | .rpc_argp = dp, |
c237dc03 | 553 | .rpc_cred = clp->cl_cb_conn.cb_cred |
1da177e4 | 554 | }; |
63e4863f | 555 | int status; |
1da177e4 | 556 | |
3aea09dc | 557 | dp->dl_retries = 1; |
63e4863f BF |
558 | status = rpc_call_async(clnt, &msg, RPC_TASK_SOFT, |
559 | &nfsd4_cb_recall_ops, dp); | |
560 | if (status) { | |
561 | put_nfs4_client(clp); | |
562 | nfs4_put_delegation(dp); | |
1da177e4 | 563 | } |
1da177e4 | 564 | } |