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> | |
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 { | |
59 | NFSPROC4_CLNT_CB_NULL = 0, | |
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; | |
143 | u32 taglen; | |
144 | char * tag; | |
145 | }; | |
146 | ||
147 | static struct { | |
148 | int stat; | |
149 | int errno; | |
150 | } nfs_cb_errtbl[] = { | |
151 | { NFS4_OK, 0 }, | |
152 | { NFS4ERR_PERM, EPERM }, | |
153 | { NFS4ERR_NOENT, ENOENT }, | |
154 | { NFS4ERR_IO, EIO }, | |
155 | { NFS4ERR_NXIO, ENXIO }, | |
156 | { NFS4ERR_ACCESS, EACCES }, | |
157 | { NFS4ERR_EXIST, EEXIST }, | |
158 | { NFS4ERR_XDEV, EXDEV }, | |
159 | { NFS4ERR_NOTDIR, ENOTDIR }, | |
160 | { NFS4ERR_ISDIR, EISDIR }, | |
161 | { NFS4ERR_INVAL, EINVAL }, | |
162 | { NFS4ERR_FBIG, EFBIG }, | |
163 | { NFS4ERR_NOSPC, ENOSPC }, | |
164 | { NFS4ERR_ROFS, EROFS }, | |
165 | { NFS4ERR_MLINK, EMLINK }, | |
166 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, | |
167 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, | |
168 | { NFS4ERR_DQUOT, EDQUOT }, | |
169 | { NFS4ERR_STALE, ESTALE }, | |
170 | { NFS4ERR_BADHANDLE, EBADHANDLE }, | |
171 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, | |
172 | { NFS4ERR_NOTSUPP, ENOTSUPP }, | |
173 | { NFS4ERR_TOOSMALL, ETOOSMALL }, | |
174 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, | |
175 | { NFS4ERR_BADTYPE, EBADTYPE }, | |
176 | { NFS4ERR_LOCKED, EAGAIN }, | |
177 | { NFS4ERR_RESOURCE, EREMOTEIO }, | |
178 | { NFS4ERR_SYMLINK, ELOOP }, | |
179 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, | |
180 | { NFS4ERR_DEADLOCK, EDEADLK }, | |
181 | { -1, EIO } | |
182 | }; | |
183 | ||
184 | static int | |
185 | nfs_cb_stat_to_errno(int stat) | |
186 | { | |
187 | int i; | |
188 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
189 | if (nfs_cb_errtbl[i].stat == stat) | |
190 | return nfs_cb_errtbl[i].errno; | |
191 | } | |
192 | /* If we cannot translate the error, the recovery routines should | |
193 | * handle it. | |
194 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
195 | * not conflict with native Linux error codes. | |
196 | */ | |
197 | return stat; | |
198 | } | |
199 | ||
200 | /* | |
201 | * XDR encode | |
202 | */ | |
203 | ||
204 | static int | |
205 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) | |
206 | { | |
f00f328f | 207 | __be32 * p; |
1da177e4 LT |
208 | |
209 | RESERVE_SPACE(16); | |
210 | WRITE32(0); /* tag length is always 0 */ | |
211 | WRITE32(NFS4_MINOR_VERSION); | |
212 | WRITE32(hdr->ident); | |
213 | WRITE32(hdr->nops); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int | |
218 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec) | |
219 | { | |
f00f328f | 220 | __be32 *p; |
6c02eaa1 | 221 | int len = cb_rec->cbr_fh.fh_size; |
1da177e4 LT |
222 | |
223 | RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len); | |
224 | WRITE32(OP_CB_RECALL); | |
8e407414 BH |
225 | WRITE32(cb_rec->cbr_stateid.si_generation); |
226 | WRITEMEM(&cb_rec->cbr_stateid.si_opaque, sizeof(stateid_opaque_t)); | |
1da177e4 LT |
227 | WRITE32(cb_rec->cbr_trunc); |
228 | WRITE32(len); | |
6c02eaa1 | 229 | WRITEMEM(&cb_rec->cbr_fh.fh_base, len); |
1da177e4 LT |
230 | return 0; |
231 | } | |
232 | ||
233 | static int | |
f00f328f | 234 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
235 | { |
236 | struct xdr_stream xdrs, *xdr = &xdrs; | |
237 | ||
238 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
239 | RESERVE_SPACE(0); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int | |
f00f328f | 244 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args) |
1da177e4 LT |
245 | { |
246 | struct xdr_stream xdr; | |
247 | struct nfs4_cb_compound_hdr hdr = { | |
248 | .ident = args->cbr_ident, | |
249 | .nops = 1, | |
250 | }; | |
251 | ||
252 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
253 | encode_cb_compound_hdr(&xdr, &hdr); | |
254 | return (encode_cb_recall(&xdr, args)); | |
255 | } | |
256 | ||
257 | ||
258 | static int | |
259 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
f00f328f | 260 | __be32 *p; |
1da177e4 LT |
261 | |
262 | READ_BUF(8); | |
263 | READ32(hdr->status); | |
264 | READ32(hdr->taglen); | |
265 | READ_BUF(hdr->taglen + 4); | |
266 | hdr->tag = (char *)p; | |
267 | p += XDR_QUADLEN(hdr->taglen); | |
268 | READ32(hdr->nops); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int | |
273 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
274 | { | |
f00f328f | 275 | __be32 *p; |
1da177e4 LT |
276 | u32 op; |
277 | int32_t nfserr; | |
278 | ||
279 | READ_BUF(8); | |
280 | READ32(op); | |
281 | if (op != expected) { | |
282 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
283 | " operation %d but we issued a request for %d\n", | |
284 | op, expected); | |
285 | return -EIO; | |
286 | } | |
287 | READ32(nfserr); | |
288 | if (nfserr != NFS_OK) | |
289 | return -nfs_cb_stat_to_errno(nfserr); | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static int | |
f00f328f | 294 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) |
1da177e4 LT |
295 | { |
296 | return 0; | |
297 | } | |
298 | ||
299 | static int | |
f00f328f | 300 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p) |
1da177e4 LT |
301 | { |
302 | struct xdr_stream xdr; | |
303 | struct nfs4_cb_compound_hdr hdr; | |
304 | int status; | |
305 | ||
306 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
307 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
308 | if (status) | |
309 | goto out; | |
310 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); | |
311 | out: | |
312 | return status; | |
313 | } | |
314 | ||
315 | /* | |
316 | * RPC procedure tables | |
317 | */ | |
1da177e4 LT |
318 | #define PROC(proc, call, argtype, restype) \ |
319 | [NFSPROC4_CLNT_##proc] = { \ | |
320 | .p_proc = NFSPROC4_CB_##call, \ | |
321 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
322 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
2bea90d4 CL |
323 | .p_arglen = NFS4_##argtype##_sz, \ |
324 | .p_replen = NFS4_##restype##_sz, \ | |
cc0175c1 CL |
325 | .p_statidx = NFSPROC4_CB_##call, \ |
326 | .p_name = #proc, \ | |
1da177e4 LT |
327 | } |
328 | ||
fd39ca9a | 329 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
330 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
331 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
332 | }; | |
333 | ||
fd39ca9a | 334 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 335 | .number = 1, |
e8c96f8c | 336 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
337 | .procs = nfs4_cb_procedures |
338 | }; | |
339 | ||
340 | static struct rpc_version * nfs_cb_version[] = { | |
341 | NULL, | |
342 | &nfs_cb_version4, | |
343 | }; | |
344 | ||
ff7d9756 OK |
345 | static struct rpc_program cb_program; |
346 | ||
347 | static struct rpc_stat cb_stats = { | |
348 | .program = &cb_program | |
349 | }; | |
350 | ||
351 | #define NFS4_CALLBACK 0x40000000 | |
352 | static struct rpc_program cb_program = { | |
353 | .name = "nfs4_cb", | |
354 | .number = NFS4_CALLBACK, | |
355 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
356 | .version = nfs_cb_version, | |
357 | .stats = &cb_stats, | |
61054b14 | 358 | .pipe_dir_name = "/nfsd4_cb", |
ff7d9756 OK |
359 | }; |
360 | ||
595947ac BF |
361 | static int max_cb_time(void) |
362 | { | |
363 | return max(NFSD_LEASE_TIME/10, (time_t)1) * HZ; | |
364 | } | |
365 | ||
2b47eece BF |
366 | /* Reference counting, callback cleanup, etc., all look racy as heck. |
367 | * And why is cb_set an atomic? */ | |
368 | ||
e1cab5a5 | 369 | int setup_callback_client(struct nfs4_client *clp) |
2b47eece | 370 | { |
1da177e4 LT |
371 | struct sockaddr_in addr; |
372 | struct nfs4_callback *cb = &clp->cl_callback; | |
ae5c7947 | 373 | struct rpc_timeout timeparms = { |
595947ac BF |
374 | .to_initval = max_cb_time(), |
375 | .to_retries = 0, | |
ae5c7947 | 376 | }; |
ae5c7947 CL |
377 | struct rpc_create_args args = { |
378 | .protocol = IPPROTO_TCP, | |
379 | .address = (struct sockaddr *)&addr, | |
380 | .addrsize = sizeof(addr), | |
381 | .timeout = &timeparms, | |
ff7d9756 | 382 | .program = &cb_program, |
d5b337b4 | 383 | .prognumber = cb->cb_prog, |
ae5c7947 | 384 | .version = nfs_cb_version[1]->number, |
61054b14 | 385 | .authflavor = clp->cl_flavor, |
b6b6152c | 386 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
608207e8 | 387 | .client_name = clp->cl_principal, |
ae5c7947 | 388 | }; |
63c86716 | 389 | struct rpc_clnt *client; |
1da177e4 | 390 | |
418cd20a | 391 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) |
e1cab5a5 | 392 | return -EINVAL; |
608207e8 | 393 | |
1da177e4 LT |
394 | /* Initialize address */ |
395 | memset(&addr, 0, sizeof(addr)); | |
396 | addr.sin_family = AF_INET; | |
397 | addr.sin_port = htons(cb->cb_port); | |
398 | addr.sin_addr.s_addr = htonl(cb->cb_addr); | |
399 | ||
ae5c7947 | 400 | /* Create RPC client */ |
63c86716 | 401 | client = rpc_create(&args); |
e1cab5a5 | 402 | if (IS_ERR(client)) { |
a601caed BF |
403 | dprintk("NFSD: couldn't create callback client: %ld\n", |
404 | PTR_ERR(client)); | |
e1cab5a5 BF |
405 | return PTR_ERR(client); |
406 | } | |
407 | cb->cb_client = client; | |
408 | return 0; | |
a601caed BF |
409 | |
410 | } | |
411 | ||
ecdd03b7 BF |
412 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
413 | { | |
414 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
415 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
416 | } | |
417 | ||
e300a63c BF |
418 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
419 | { | |
420 | struct nfs4_client *clp = calldata; | |
421 | ||
422 | if (task->tk_status) | |
423 | warn_no_callback_path(clp, task->tk_status); | |
424 | else | |
425 | atomic_set(&clp->cl_callback.cb_set, 1); | |
426 | put_nfs4_client(clp); | |
427 | } | |
428 | ||
429 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
430 | .rpc_call_done = nfsd4_cb_probe_done, | |
431 | }; | |
432 | ||
3cef9ab2 BF |
433 | static struct rpc_cred *lookup_cb_cred(struct nfs4_callback *cb) |
434 | { | |
435 | struct auth_cred acred = { | |
436 | .machine_cred = 1 | |
437 | }; | |
438 | ||
439 | /* | |
440 | * Note in the gss case this doesn't actually have to wait for a | |
441 | * gss upcall (or any calls to the client); this just creates a | |
442 | * non-uptodate cred which the rpc state machine will fill in with | |
443 | * a refresh_upcall later. | |
444 | */ | |
445 | return rpcauth_lookup_credcache(cb->cb_client->cl_auth, &acred, | |
446 | RPCAUTH_LOOKUP_NEW); | |
447 | } | |
448 | ||
e300a63c | 449 | void do_probe_callback(struct nfs4_client *clp) |
a601caed | 450 | { |
a601caed BF |
451 | struct nfs4_callback *cb = &clp->cl_callback; |
452 | struct rpc_message msg = { | |
453 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
454 | .rpc_argp = clp, | |
455 | }; | |
3cef9ab2 | 456 | struct rpc_cred *cred; |
a601caed BF |
457 | int status; |
458 | ||
3cef9ab2 BF |
459 | cred = lookup_cb_cred(cb); |
460 | if (IS_ERR(cred)) { | |
461 | status = PTR_ERR(cred); | |
462 | goto out; | |
463 | } | |
464 | cb->cb_cred = cred; | |
465 | msg.rpc_cred = cb->cb_cred; | |
e300a63c BF |
466 | status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_SOFT, |
467 | &nfsd4_cb_probe_ops, (void *)clp); | |
3cef9ab2 | 468 | out: |
e300a63c | 469 | if (status) { |
ecdd03b7 | 470 | warn_no_callback_path(clp, status); |
e300a63c BF |
471 | put_nfs4_client(clp); |
472 | } | |
63c86716 BF |
473 | } |
474 | ||
475 | /* | |
476 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
477 | */ | |
478 | void | |
479 | nfsd4_probe_callback(struct nfs4_client *clp) | |
480 | { | |
ecdd03b7 | 481 | int status; |
63c86716 BF |
482 | |
483 | BUG_ON(atomic_read(&clp->cl_callback.cb_set)); | |
484 | ||
ecdd03b7 BF |
485 | status = setup_callback_client(clp); |
486 | if (status) { | |
487 | warn_no_callback_path(clp, status); | |
488 | return; | |
489 | } | |
490 | ||
541e0e09 | 491 | /* the task holds a reference to the nfs4_client struct */ |
1da177e4 LT |
492 | atomic_inc(&clp->cl_count); |
493 | ||
e300a63c | 494 | do_probe_callback(clp); |
1da177e4 LT |
495 | } |
496 | ||
1da177e4 LT |
497 | /* |
498 | * called with dp->dl_count inc'ed. | |
1da177e4 LT |
499 | */ |
500 | void | |
501 | nfsd4_cb_recall(struct nfs4_delegation *dp) | |
502 | { | |
503 | struct nfs4_client *clp = dp->dl_client; | |
504 | struct rpc_clnt *clnt = clp->cl_callback.cb_client; | |
505 | struct nfs4_cb_recall *cbr = &dp->dl_recall; | |
506 | struct rpc_message msg = { | |
507 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], | |
508 | .rpc_argp = cbr, | |
3cef9ab2 | 509 | .rpc_cred = clp->cl_callback.cb_cred |
1da177e4 LT |
510 | }; |
511 | int retries = 1; | |
512 | int status = 0; | |
513 | ||
1da177e4 LT |
514 | cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */ |
515 | cbr->cbr_dp = dp; | |
516 | ||
517 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
518 | while (retries--) { | |
519 | switch (status) { | |
520 | case -EIO: | |
521 | /* Network partition? */ | |
404ec117 | 522 | atomic_set(&clp->cl_callback.cb_set, 0); |
1da177e4 LT |
523 | case -EBADHANDLE: |
524 | case -NFS4ERR_BAD_STATEID: | |
525 | /* Race: client probably got cb_recall | |
526 | * before open reply granting delegation */ | |
527 | break; | |
528 | default: | |
529 | goto out_put_cred; | |
530 | } | |
531 | ssleep(2); | |
532 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
533 | } | |
534 | out_put_cred: | |
404ec117 BF |
535 | /* |
536 | * Success or failure, now we're either waiting for lease expiration | |
537 | * or deleg_return. | |
538 | */ | |
cfdcad4d | 539 | put_nfs4_client(clp); |
1da177e4 LT |
540 | nfs4_put_delegation(dp); |
541 | return; | |
542 | } |