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 | ||
36 | #include <linux/config.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/list.h> | |
39 | #include <linux/inet.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/sunrpc/xdr.h> | |
43 | #include <linux/sunrpc/svc.h> | |
44 | #include <linux/sunrpc/clnt.h> | |
45 | #include <linux/nfsd/nfsd.h> | |
46 | #include <linux/nfsd/state.h> | |
47 | #include <linux/sunrpc/sched.h> | |
48 | #include <linux/nfs4.h> | |
49 | ||
50 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
51 | ||
52 | #define NFSPROC4_CB_NULL 0 | |
53 | #define NFSPROC4_CB_COMPOUND 1 | |
54 | ||
55 | /* declarations */ | |
963d8fe5 | 56 | static const struct rpc_call_ops nfs4_cb_null_ops; |
1da177e4 LT |
57 | |
58 | /* Index of predefined Linux callback client operations */ | |
59 | ||
60 | enum { | |
61 | NFSPROC4_CLNT_CB_NULL = 0, | |
62 | NFSPROC4_CLNT_CB_RECALL, | |
63 | }; | |
64 | ||
65 | enum nfs_cb_opnum4 { | |
66 | OP_CB_RECALL = 4, | |
67 | }; | |
68 | ||
69 | #define NFS4_MAXTAGLEN 20 | |
70 | ||
71 | #define NFS4_enc_cb_null_sz 0 | |
72 | #define NFS4_dec_cb_null_sz 0 | |
73 | #define cb_compound_enc_hdr_sz 4 | |
74 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
75 | #define op_enc_sz 1 | |
76 | #define op_dec_sz 2 | |
77 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
78 | #define enc_stateid_sz 16 | |
79 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ | |
80 | 1 + enc_stateid_sz + \ | |
81 | enc_nfs4_fh_sz) | |
82 | ||
83 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
84 | op_dec_sz) | |
85 | ||
86 | /* | |
87 | * Generic encode routines from fs/nfs/nfs4xdr.c | |
88 | */ | |
89 | static inline u32 * | |
90 | xdr_writemem(u32 *p, const void *ptr, int nbytes) | |
91 | { | |
92 | int tmp = XDR_QUADLEN(nbytes); | |
93 | if (!tmp) | |
94 | return p; | |
95 | p[tmp-1] = 0; | |
96 | memcpy(p, ptr, nbytes); | |
97 | return p + tmp; | |
98 | } | |
99 | ||
100 | #define WRITE32(n) *p++ = htonl(n) | |
101 | #define WRITEMEM(ptr,nbytes) do { \ | |
102 | p = xdr_writemem(p, ptr, nbytes); \ | |
103 | } while (0) | |
104 | #define RESERVE_SPACE(nbytes) do { \ | |
105 | p = xdr_reserve_space(xdr, nbytes); \ | |
106 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \ | |
107 | BUG_ON(!p); \ | |
108 | } while (0) | |
109 | ||
110 | /* | |
111 | * Generic decode routines from fs/nfs/nfs4xdr.c | |
112 | */ | |
113 | #define DECODE_TAIL \ | |
114 | status = 0; \ | |
115 | out: \ | |
116 | return status; \ | |
117 | xdr_error: \ | |
118 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ | |
119 | status = -EIO; \ | |
120 | goto out | |
121 | ||
122 | #define READ32(x) (x) = ntohl(*p++) | |
123 | #define READ64(x) do { \ | |
124 | (x) = (u64)ntohl(*p++) << 32; \ | |
125 | (x) |= ntohl(*p++); \ | |
126 | } while (0) | |
127 | #define READTIME(x) do { \ | |
128 | p++; \ | |
129 | (x.tv_sec) = ntohl(*p++); \ | |
130 | (x.tv_nsec) = ntohl(*p++); \ | |
131 | } while (0) | |
132 | #define READ_BUF(nbytes) do { \ | |
133 | p = xdr_inline_decode(xdr, nbytes); \ | |
134 | if (!p) { \ | |
135 | dprintk("NFSD: %s: reply buffer overflowed in line %d.", \ | |
136 | __FUNCTION__, __LINE__); \ | |
137 | return -EIO; \ | |
138 | } \ | |
139 | } while (0) | |
140 | ||
141 | struct nfs4_cb_compound_hdr { | |
142 | int status; | |
143 | u32 ident; | |
144 | u32 nops; | |
145 | u32 taglen; | |
146 | char * tag; | |
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 | ||
206 | static int | |
207 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) | |
208 | { | |
209 | u32 * p; | |
210 | ||
211 | RESERVE_SPACE(16); | |
212 | WRITE32(0); /* tag length is always 0 */ | |
213 | WRITE32(NFS4_MINOR_VERSION); | |
214 | WRITE32(hdr->ident); | |
215 | WRITE32(hdr->nops); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | static int | |
220 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec) | |
221 | { | |
222 | u32 *p; | |
223 | int len = cb_rec->cbr_fhlen; | |
224 | ||
225 | RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len); | |
226 | WRITE32(OP_CB_RECALL); | |
227 | WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t)); | |
228 | WRITE32(cb_rec->cbr_trunc); | |
229 | WRITE32(len); | |
230 | WRITEMEM(cb_rec->cbr_fhval, len); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static int | |
235 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, u32 *p) | |
236 | { | |
237 | struct xdr_stream xdrs, *xdr = &xdrs; | |
238 | ||
239 | xdr_init_encode(&xdrs, &req->rq_snd_buf, p); | |
240 | RESERVE_SPACE(0); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int | |
245 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, u32 *p, struct nfs4_cb_recall *args) | |
246 | { | |
247 | struct xdr_stream xdr; | |
248 | struct nfs4_cb_compound_hdr hdr = { | |
249 | .ident = args->cbr_ident, | |
250 | .nops = 1, | |
251 | }; | |
252 | ||
253 | xdr_init_encode(&xdr, &req->rq_snd_buf, p); | |
254 | encode_cb_compound_hdr(&xdr, &hdr); | |
255 | return (encode_cb_recall(&xdr, args)); | |
256 | } | |
257 | ||
258 | ||
259 | static int | |
260 | decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){ | |
261 | u32 *p; | |
262 | ||
263 | READ_BUF(8); | |
264 | READ32(hdr->status); | |
265 | READ32(hdr->taglen); | |
266 | READ_BUF(hdr->taglen + 4); | |
267 | hdr->tag = (char *)p; | |
268 | p += XDR_QUADLEN(hdr->taglen); | |
269 | READ32(hdr->nops); | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static int | |
274 | decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) | |
275 | { | |
276 | u32 *p; | |
277 | u32 op; | |
278 | int32_t nfserr; | |
279 | ||
280 | READ_BUF(8); | |
281 | READ32(op); | |
282 | if (op != expected) { | |
283 | dprintk("NFSD: decode_cb_op_hdr: Callback server returned " | |
284 | " operation %d but we issued a request for %d\n", | |
285 | op, expected); | |
286 | return -EIO; | |
287 | } | |
288 | READ32(nfserr); | |
289 | if (nfserr != NFS_OK) | |
290 | return -nfs_cb_stat_to_errno(nfserr); | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static int | |
295 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, u32 *p) | |
296 | { | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static int | |
301 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, u32 *p) | |
302 | { | |
303 | struct xdr_stream xdr; | |
304 | struct nfs4_cb_compound_hdr hdr; | |
305 | int status; | |
306 | ||
307 | xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p); | |
308 | status = decode_cb_compound_hdr(&xdr, &hdr); | |
309 | if (status) | |
310 | goto out; | |
311 | status = decode_cb_op_hdr(&xdr, OP_CB_RECALL); | |
312 | out: | |
313 | return status; | |
314 | } | |
315 | ||
316 | /* | |
317 | * RPC procedure tables | |
318 | */ | |
319 | #ifndef MAX | |
320 | # define MAX(a, b) (((a) > (b))? (a) : (b)) | |
321 | #endif | |
322 | ||
323 | #define PROC(proc, call, argtype, restype) \ | |
324 | [NFSPROC4_CLNT_##proc] = { \ | |
325 | .p_proc = NFSPROC4_CB_##call, \ | |
326 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ | |
327 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ | |
328 | .p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2, \ | |
cc0175c1 CL |
329 | .p_statidx = NFSPROC4_CB_##call, \ |
330 | .p_name = #proc, \ | |
1da177e4 LT |
331 | } |
332 | ||
fd39ca9a | 333 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
1da177e4 LT |
334 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
335 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), | |
336 | }; | |
337 | ||
fd39ca9a | 338 | static struct rpc_version nfs_cb_version4 = { |
1da177e4 | 339 | .number = 1, |
e8c96f8c | 340 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
1da177e4 LT |
341 | .procs = nfs4_cb_procedures |
342 | }; | |
343 | ||
344 | static struct rpc_version * nfs_cb_version[] = { | |
345 | NULL, | |
346 | &nfs_cb_version4, | |
347 | }; | |
348 | ||
349 | /* | |
350 | * Use the SETCLIENTID credential | |
351 | */ | |
fd39ca9a | 352 | static struct rpc_cred * |
1da177e4 LT |
353 | nfsd4_lookupcred(struct nfs4_client *clp, int taskflags) |
354 | { | |
355 | struct auth_cred acred; | |
356 | struct rpc_clnt *clnt = clp->cl_callback.cb_client; | |
357 | struct rpc_cred *ret; | |
358 | ||
359 | get_group_info(clp->cl_cred.cr_group_info); | |
360 | acred.uid = clp->cl_cred.cr_uid; | |
361 | acred.gid = clp->cl_cred.cr_gid; | |
362 | acred.group_info = clp->cl_cred.cr_group_info; | |
363 | ||
364 | dprintk("NFSD: looking up %s cred\n", | |
365 | clnt->cl_auth->au_ops->au_name); | |
366 | ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags); | |
367 | put_group_info(clp->cl_cred.cr_group_info); | |
368 | return ret; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... | |
373 | */ | |
374 | void | |
375 | nfsd4_probe_callback(struct nfs4_client *clp) | |
376 | { | |
377 | struct sockaddr_in addr; | |
378 | struct nfs4_callback *cb = &clp->cl_callback; | |
379 | struct rpc_timeout timeparms; | |
380 | struct rpc_xprt * xprt; | |
381 | struct rpc_program * program = &cb->cb_program; | |
382 | struct rpc_stat * stat = &cb->cb_stat; | |
383 | struct rpc_clnt * clnt; | |
384 | struct rpc_message msg = { | |
385 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], | |
386 | .rpc_argp = clp, | |
387 | }; | |
388 | char hostname[32]; | |
389 | int status; | |
390 | ||
cb36d634 | 391 | if (atomic_read(&cb->cb_set)) |
1da177e4 LT |
392 | return; |
393 | ||
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 | ||
400 | /* Initialize timeout */ | |
401 | timeparms.to_initval = (NFSD_LEASE_TIME/4) * HZ; | |
402 | timeparms.to_retries = 0; | |
403 | timeparms.to_maxval = (NFSD_LEASE_TIME/2) * HZ; | |
404 | timeparms.to_exponential = 1; | |
405 | ||
406 | /* Create RPC transport */ | |
f1ee4f22 N |
407 | xprt = xprt_create_proto(IPPROTO_TCP, &addr, &timeparms); |
408 | if (IS_ERR(xprt)) { | |
1da177e4 LT |
409 | dprintk("NFSD: couldn't create callback transport!\n"); |
410 | goto out_err; | |
411 | } | |
412 | ||
413 | /* Initialize rpc_program */ | |
414 | program->name = "nfs4_cb"; | |
415 | program->number = cb->cb_prog; | |
e8c96f8c | 416 | program->nrvers = ARRAY_SIZE(nfs_cb_version); |
1da177e4 LT |
417 | program->version = nfs_cb_version; |
418 | program->stats = stat; | |
419 | ||
420 | /* Initialize rpc_stat */ | |
421 | memset(stat, 0, sizeof(struct rpc_stat)); | |
422 | stat->program = program; | |
423 | ||
424 | /* Create RPC client | |
425 | * | |
426 | * XXX AUTH_UNIX only - need AUTH_GSS.... | |
427 | */ | |
428 | sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr.sin_addr.s_addr)); | |
5ba266d6 | 429 | clnt = rpc_new_client(xprt, hostname, program, 1, RPC_AUTH_UNIX); |
f1ee4f22 | 430 | if (IS_ERR(clnt)) { |
1da177e4 | 431 | dprintk("NFSD: couldn't create callback client\n"); |
5b616f5d | 432 | goto out_err; |
1da177e4 LT |
433 | } |
434 | clnt->cl_intr = 0; | |
435 | clnt->cl_softrtry = 1; | |
1da177e4 LT |
436 | |
437 | /* Kick rpciod, put the call on the wire. */ | |
438 | ||
439 | if (rpciod_up() != 0) { | |
440 | dprintk("nfsd: couldn't start rpciod for callbacks!\n"); | |
441 | goto out_clnt; | |
442 | } | |
443 | ||
1da177e4 | 444 | cb->cb_client = clnt; |
541e0e09 N |
445 | |
446 | /* the task holds a reference to the nfs4_client struct */ | |
1da177e4 LT |
447 | atomic_inc(&clp->cl_count); |
448 | ||
449 | msg.rpc_cred = nfsd4_lookupcred(clp,0); | |
450 | if (IS_ERR(msg.rpc_cred)) | |
451 | goto out_rpciod; | |
963d8fe5 | 452 | status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL); |
1da177e4 LT |
453 | put_rpccred(msg.rpc_cred); |
454 | ||
455 | if (status != 0) { | |
456 | dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n"); | |
457 | goto out_rpciod; | |
458 | } | |
459 | return; | |
460 | ||
461 | out_rpciod: | |
462 | atomic_dec(&clp->cl_count); | |
463 | rpciod_down(); | |
541e0e09 | 464 | cb->cb_client = NULL; |
1da177e4 LT |
465 | out_clnt: |
466 | rpc_shutdown_client(clnt); | |
1da177e4 LT |
467 | out_err: |
468 | dprintk("NFSD: warning: no callback path to client %.*s\n", | |
469 | (int)clp->cl_name.len, clp->cl_name.data); | |
1da177e4 LT |
470 | } |
471 | ||
472 | static void | |
963d8fe5 | 473 | nfs4_cb_null(struct rpc_task *task, void *dummy) |
1da177e4 LT |
474 | { |
475 | struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; | |
476 | struct nfs4_callback *cb = &clp->cl_callback; | |
477 | u32 addr = htonl(cb->cb_addr); | |
478 | ||
479 | dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status); | |
480 | ||
481 | if (task->tk_status < 0) { | |
482 | dprintk("NFSD: callback establishment to client %.*s failed\n", | |
483 | (int)clp->cl_name.len, clp->cl_name.data); | |
484 | goto out; | |
485 | } | |
486 | atomic_set(&cb->cb_set, 1); | |
487 | dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr)); | |
488 | out: | |
489 | put_nfs4_client(clp); | |
490 | } | |
491 | ||
963d8fe5 TM |
492 | static const struct rpc_call_ops nfs4_cb_null_ops = { |
493 | .rpc_call_done = nfs4_cb_null, | |
494 | }; | |
495 | ||
1da177e4 LT |
496 | /* |
497 | * called with dp->dl_count inc'ed. | |
498 | * nfs4_lock_state() may or may not have been called. | |
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, | |
509 | }; | |
510 | int retries = 1; | |
511 | int status = 0; | |
512 | ||
513 | if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt) | |
514 | return; | |
515 | ||
516 | msg.rpc_cred = nfsd4_lookupcred(clp, 0); | |
517 | if (IS_ERR(msg.rpc_cred)) | |
518 | goto out; | |
519 | ||
520 | cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */ | |
521 | cbr->cbr_dp = dp; | |
522 | ||
523 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
524 | while (retries--) { | |
525 | switch (status) { | |
526 | case -EIO: | |
527 | /* Network partition? */ | |
528 | case -EBADHANDLE: | |
529 | case -NFS4ERR_BAD_STATEID: | |
530 | /* Race: client probably got cb_recall | |
531 | * before open reply granting delegation */ | |
532 | break; | |
533 | default: | |
534 | goto out_put_cred; | |
535 | } | |
536 | ssleep(2); | |
537 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); | |
538 | } | |
539 | out_put_cred: | |
540 | put_rpccred(msg.rpc_cred); | |
541 | out: | |
542 | if (status == -EIO) | |
543 | atomic_set(&clp->cl_callback.cb_set, 0); | |
544 | /* Success or failure, now we're either waiting for lease expiration | |
545 | * or deleg_return. */ | |
546 | dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count)); | |
547 | nfs4_put_delegation(dp); | |
548 | return; | |
549 | } |