blob: 31d6633c7fe46345b7ec60a74caa0aa92e077d11 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/module.h>
37#include <linux/list.h>
38#include <linux/inet.h>
39#include <linux/errno.h>
40#include <linux/delay.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040041#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#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 */
Trond Myklebust963d8fe2006-01-03 09:55:04 +010056static const struct rpc_call_ops nfs4_cb_null_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58/* Index of predefined Linux callback client operations */
59
60enum {
61 NFSPROC4_CLNT_CB_NULL = 0,
62 NFSPROC4_CLNT_CB_RECALL,
63};
64
65enum 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))
Benny Halevy0ac68d12007-07-17 04:04:37 -070078#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#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*/
Al Virof00f3282006-10-19 23:29:01 -070089static inline __be32 *
90xdr_writemem(__be32 *p, const void *ptr, int nbytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
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; \
115out: \
116 return status; \
117xdr_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) { \
Greg Banks3e3b4802006-10-02 02:17:41 -0700135 dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 __FUNCTION__, __LINE__); \
137 return -EIO; \
138 } \
139} while (0)
140
141struct nfs4_cb_compound_hdr {
142 int status;
143 u32 ident;
144 u32 nops;
145 u32 taglen;
146 char * tag;
147};
148
149static struct {
150int stat;
151int 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
186static int
187nfs_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
206static int
207encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
208{
Al Virof00f3282006-10-19 23:29:01 -0700209 __be32 * p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
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
219static int
220encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
221{
Al Virof00f3282006-10-19 23:29:01 -0700222 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 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
234static int
Al Virof00f3282006-10-19 23:29:01 -0700235nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
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
244static int
Al Virof00f3282006-10-19 23:29:01 -0700245nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p, struct nfs4_cb_recall *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
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
259static int
260decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
Al Virof00f3282006-10-19 23:29:01 -0700261 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
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
273static int
274decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
275{
Al Virof00f3282006-10-19 23:29:01 -0700276 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 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
294static int
Al Virof00f3282006-10-19 23:29:01 -0700295nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 return 0;
298}
299
300static int
Al Virof00f3282006-10-19 23:29:01 -0700301nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
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);
312out:
313 return status;
314}
315
316/*
317 * RPC procedure tables
318 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319#define PROC(proc, call, argtype, restype) \
320[NFSPROC4_CLNT_##proc] = { \
321 .p_proc = NFSPROC4_CB_##call, \
322 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
323 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
Chuck Lever2bea90d2007-03-29 16:47:53 -0400324 .p_arglen = NFS4_##argtype##_sz, \
325 .p_replen = NFS4_##restype##_sz, \
Chuck Levercc0175c2006-03-20 13:44:22 -0500326 .p_statidx = NFSPROC4_CB_##call, \
327 .p_name = #proc, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
NeilBrownfd39ca92005-06-23 22:04:03 -0700330static struct rpc_procinfo nfs4_cb_procedures[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
332 PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
333};
334
NeilBrownfd39ca92005-06-23 22:04:03 -0700335static struct rpc_version nfs_cb_version4 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 .number = 1,
Tobias Klausere8c96f82006-03-24 03:15:34 -0800337 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 .procs = nfs4_cb_procedures
339};
340
341static struct rpc_version * nfs_cb_version[] = {
342 NULL,
343 &nfs_cb_version4,
344};
345
346/*
347 * Use the SETCLIENTID credential
348 */
NeilBrownfd39ca92005-06-23 22:04:03 -0700349static struct rpc_cred *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350nfsd4_lookupcred(struct nfs4_client *clp, int taskflags)
351{
352 struct auth_cred acred;
353 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
354 struct rpc_cred *ret;
355
356 get_group_info(clp->cl_cred.cr_group_info);
357 acred.uid = clp->cl_cred.cr_uid;
358 acred.gid = clp->cl_cred.cr_gid;
359 acred.group_info = clp->cl_cred.cr_group_info;
360
361 dprintk("NFSD: looking up %s cred\n",
362 clnt->cl_auth->au_ops->au_name);
363 ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags);
364 put_group_info(clp->cl_cred.cr_group_info);
365 return ret;
366}
367
368/*
369 * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
370 */
371void
372nfsd4_probe_callback(struct nfs4_client *clp)
373{
374 struct sockaddr_in addr;
375 struct nfs4_callback *cb = &clp->cl_callback;
Chuck Leverae5c7942006-08-22 20:06:21 -0400376 struct rpc_timeout timeparms = {
377 .to_initval = (NFSD_LEASE_TIME/4) * HZ,
378 .to_retries = 5,
379 .to_maxval = (NFSD_LEASE_TIME/2) * HZ,
380 .to_exponential = 1,
381 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 struct rpc_program * program = &cb->cb_program;
Chuck Leverae5c7942006-08-22 20:06:21 -0400383 struct rpc_create_args args = {
384 .protocol = IPPROTO_TCP,
385 .address = (struct sockaddr *)&addr,
386 .addrsize = sizeof(addr),
387 .timeout = &timeparms,
Chuck Leverae5c7942006-08-22 20:06:21 -0400388 .program = program,
389 .version = nfs_cb_version[1]->number,
390 .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */
391 .flags = (RPC_CLNT_CREATE_NOPING),
392 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 struct rpc_message msg = {
394 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
395 .rpc_argp = clp,
396 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 int status;
398
NeilBrowncb36d632005-06-23 22:04:23 -0700399 if (atomic_read(&cb->cb_set))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return;
401
402 /* Initialize address */
403 memset(&addr, 0, sizeof(addr));
404 addr.sin_family = AF_INET;
405 addr.sin_port = htons(cb->cb_port);
406 addr.sin_addr.s_addr = htonl(cb->cb_addr);
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 /* Initialize rpc_program */
409 program->name = "nfs4_cb";
410 program->number = cb->cb_prog;
Tobias Klausere8c96f82006-03-24 03:15:34 -0800411 program->nrvers = ARRAY_SIZE(nfs_cb_version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 program->version = nfs_cb_version;
Chuck Leverae5c7942006-08-22 20:06:21 -0400413 program->stats = &cb->cb_stat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
415 /* Initialize rpc_stat */
Chuck Leverae5c7942006-08-22 20:06:21 -0400416 memset(program->stats, 0, sizeof(cb->cb_stat));
417 program->stats->program = program;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
Chuck Leverae5c7942006-08-22 20:06:21 -0400419 /* Create RPC client */
420 cb->cb_client = rpc_create(&args);
J. Bruce Fields09421762006-10-17 00:10:16 -0700421 if (IS_ERR(cb->cb_client)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 dprintk("NFSD: couldn't create callback client\n");
Trond Myklebust5b616f52005-06-22 17:16:20 +0000423 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
NeilBrown541e0e02006-04-10 22:55:38 -0700426 /* the task holds a reference to the nfs4_client struct */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 atomic_inc(&clp->cl_count);
428
429 msg.rpc_cred = nfsd4_lookupcred(clp,0);
430 if (IS_ERR(msg.rpc_cred))
Trond Myklebustf61534d2007-06-14 17:31:58 -0400431 goto out_release_clp;
Chuck Leverae5c7942006-08-22 20:06:21 -0400432 status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 put_rpccred(msg.rpc_cred);
434
435 if (status != 0) {
436 dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n");
Trond Myklebustf61534d2007-06-14 17:31:58 -0400437 goto out_release_clp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439 return;
440
Trond Myklebustf61534d2007-06-14 17:31:58 -0400441out_release_clp:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 atomic_dec(&clp->cl_count);
Chuck Leverae5c7942006-08-22 20:06:21 -0400443 rpc_shutdown_client(cb->cb_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444out_err:
J. Bruce Fields09421762006-10-17 00:10:16 -0700445 cb->cb_client = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 dprintk("NFSD: warning: no callback path to client %.*s\n",
447 (int)clp->cl_name.len, clp->cl_name.data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
450static void
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100451nfs4_cb_null(struct rpc_task *task, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452{
453 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
454 struct nfs4_callback *cb = &clp->cl_callback;
Al Viroc7afef12006-10-19 23:29:02 -0700455 __be32 addr = htonl(cb->cb_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status);
458
459 if (task->tk_status < 0) {
460 dprintk("NFSD: callback establishment to client %.*s failed\n",
461 (int)clp->cl_name.len, clp->cl_name.data);
462 goto out;
463 }
464 atomic_set(&cb->cb_set, 1);
465 dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr));
466out:
467 put_nfs4_client(clp);
468}
469
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100470static const struct rpc_call_ops nfs4_cb_null_ops = {
471 .rpc_call_done = nfs4_cb_null,
472};
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474/*
475 * called with dp->dl_count inc'ed.
476 * nfs4_lock_state() may or may not have been called.
477 */
478void
479nfsd4_cb_recall(struct nfs4_delegation *dp)
480{
481 struct nfs4_client *clp = dp->dl_client;
482 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
483 struct nfs4_cb_recall *cbr = &dp->dl_recall;
484 struct rpc_message msg = {
485 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
486 .rpc_argp = cbr,
487 };
488 int retries = 1;
489 int status = 0;
490
491 if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
492 return;
493
494 msg.rpc_cred = nfsd4_lookupcred(clp, 0);
495 if (IS_ERR(msg.rpc_cred))
496 goto out;
497
498 cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
499 cbr->cbr_dp = dp;
500
501 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
502 while (retries--) {
503 switch (status) {
504 case -EIO:
505 /* Network partition? */
506 case -EBADHANDLE:
507 case -NFS4ERR_BAD_STATEID:
508 /* Race: client probably got cb_recall
509 * before open reply granting delegation */
510 break;
511 default:
512 goto out_put_cred;
513 }
514 ssleep(2);
515 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
516 }
517out_put_cred:
518 put_rpccred(msg.rpc_cred);
519out:
520 if (status == -EIO)
521 atomic_set(&clp->cl_callback.cb_set, 0);
522 /* Success or failure, now we're either waiting for lease expiration
523 * or deleg_return. */
524 dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count));
525 nfs4_put_delegation(dp);
526 return;
527}