2 * linux/fs/nfsd/nfs4callback.c
4 * Copyright (c) 2001 The Regents of the University of Michigan.
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <andros@umich.edu>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
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>
50 #define NFSDDBG_FACILITY NFSDDBG_PROC
52 #define NFSPROC4_CB_NULL 0
53 #define NFSPROC4_CB_COMPOUND 1
56 static void nfs4_cb_null(struct rpc_task *task);
57 extern spinlock_t recall_lock;
59 /* Index of predefined Linux callback client operations */
62 NFSPROC4_CLNT_CB_NULL = 0,
63 NFSPROC4_CLNT_CB_RECALL,
70 #define NFS4_MAXTAGLEN 20
72 #define NFS4_enc_cb_null_sz 0
73 #define NFS4_dec_cb_null_sz 0
74 #define cb_compound_enc_hdr_sz 4
75 #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
78 #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
79 #define enc_stateid_sz 16
80 #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
81 1 + enc_stateid_sz + \
84 #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
88 * Generic encode routines from fs/nfs/nfs4xdr.c
91 xdr_writemem(u32 *p, const void *ptr, int nbytes)
93 int tmp = XDR_QUADLEN(nbytes);
97 memcpy(p, ptr, nbytes);
101 #define WRITE32(n) *p++ = htonl(n)
102 #define WRITEMEM(ptr,nbytes) do { \
103 p = xdr_writemem(p, ptr, nbytes); \
105 #define RESERVE_SPACE(nbytes) do { \
106 p = xdr_reserve_space(xdr, nbytes); \
107 if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \
112 * Generic decode routines from fs/nfs/nfs4xdr.c
114 #define DECODE_TAIL \
119 dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
123 #define READ32(x) (x) = ntohl(*p++)
124 #define READ64(x) do { \
125 (x) = (u64)ntohl(*p++) << 32; \
126 (x) |= ntohl(*p++); \
128 #define READTIME(x) do { \
130 (x.tv_sec) = ntohl(*p++); \
131 (x.tv_nsec) = ntohl(*p++); \
133 #define READ_BUF(nbytes) do { \
134 p = xdr_inline_decode(xdr, nbytes); \
136 dprintk("NFSD: %s: reply buffer overflowed in line %d.", \
137 __FUNCTION__, __LINE__); \
142 struct nfs4_cb_compound_hdr {
153 } nfs_cb_errtbl[] = {
155 { NFS4ERR_PERM, EPERM },
156 { NFS4ERR_NOENT, ENOENT },
158 { NFS4ERR_NXIO, ENXIO },
159 { NFS4ERR_ACCESS, EACCES },
160 { NFS4ERR_EXIST, EEXIST },
161 { NFS4ERR_XDEV, EXDEV },
162 { NFS4ERR_NOTDIR, ENOTDIR },
163 { NFS4ERR_ISDIR, EISDIR },
164 { NFS4ERR_INVAL, EINVAL },
165 { NFS4ERR_FBIG, EFBIG },
166 { NFS4ERR_NOSPC, ENOSPC },
167 { NFS4ERR_ROFS, EROFS },
168 { NFS4ERR_MLINK, EMLINK },
169 { NFS4ERR_NAMETOOLONG, ENAMETOOLONG },
170 { NFS4ERR_NOTEMPTY, ENOTEMPTY },
171 { NFS4ERR_DQUOT, EDQUOT },
172 { NFS4ERR_STALE, ESTALE },
173 { NFS4ERR_BADHANDLE, EBADHANDLE },
174 { NFS4ERR_BAD_COOKIE, EBADCOOKIE },
175 { NFS4ERR_NOTSUPP, ENOTSUPP },
176 { NFS4ERR_TOOSMALL, ETOOSMALL },
177 { NFS4ERR_SERVERFAULT, ESERVERFAULT },
178 { NFS4ERR_BADTYPE, EBADTYPE },
179 { NFS4ERR_LOCKED, EAGAIN },
180 { NFS4ERR_RESOURCE, EREMOTEIO },
181 { NFS4ERR_SYMLINK, ELOOP },
182 { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP },
183 { NFS4ERR_DEADLOCK, EDEADLK },
188 nfs_cb_stat_to_errno(int stat)
191 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
192 if (nfs_cb_errtbl[i].stat == stat)
193 return nfs_cb_errtbl[i].errno;
195 /* If we cannot translate the error, the recovery routines should
197 * Note: remaining NFSv4 error codes have values > 10000, so should
198 * not conflict with native Linux error codes.
208 encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
213 WRITE32(0); /* tag length is always 0 */
214 WRITE32(NFS4_MINOR_VERSION);
221 encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
224 int len = cb_rec->cbr_fhlen;
226 RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
227 WRITE32(OP_CB_RECALL);
228 WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t));
229 WRITE32(cb_rec->cbr_trunc);
231 WRITEMEM(cb_rec->cbr_fhval, len);
236 nfs4_xdr_enc_cb_null(struct rpc_rqst *req, u32 *p)
238 struct xdr_stream xdrs, *xdr = &xdrs;
240 xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
246 nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, u32 *p, struct nfs4_cb_recall *args)
248 struct xdr_stream xdr;
249 struct nfs4_cb_compound_hdr hdr = {
250 .ident = args->cbr_ident,
254 xdr_init_encode(&xdr, &req->rq_snd_buf, p);
255 encode_cb_compound_hdr(&xdr, &hdr);
256 return (encode_cb_recall(&xdr, args));
261 decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
267 READ_BUF(hdr->taglen + 4);
268 hdr->tag = (char *)p;
269 p += XDR_QUADLEN(hdr->taglen);
275 decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
283 if (op != expected) {
284 dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
285 " operation %d but we issued a request for %d\n",
290 if (nfserr != NFS_OK)
291 return -nfs_cb_stat_to_errno(nfserr);
296 nfs4_xdr_dec_cb_null(struct rpc_rqst *req, u32 *p)
302 nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, u32 *p)
304 struct xdr_stream xdr;
305 struct nfs4_cb_compound_hdr hdr;
308 xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
309 status = decode_cb_compound_hdr(&xdr, &hdr);
312 status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
318 * RPC procedure tables
321 # define MAX(a, b) (((a) > (b))? (a) : (b))
324 #define PROC(proc, call, argtype, restype) \
325 [NFSPROC4_CLNT_##proc] = { \
326 .p_proc = NFSPROC4_CB_##call, \
327 .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
328 .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
329 .p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2, \
332 struct rpc_procinfo nfs4_cb_procedures[] = {
333 PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
334 PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
337 struct rpc_version nfs_cb_version4 = {
339 .nrprocs = sizeof(nfs4_cb_procedures)/sizeof(nfs4_cb_procedures[0]),
340 .procs = nfs4_cb_procedures
343 static struct rpc_version * nfs_cb_version[] = {
349 * Use the SETCLIENTID credential
352 nfsd4_lookupcred(struct nfs4_client *clp, int taskflags)
354 struct auth_cred acred;
355 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
356 struct rpc_cred *ret;
358 get_group_info(clp->cl_cred.cr_group_info);
359 acred.uid = clp->cl_cred.cr_uid;
360 acred.gid = clp->cl_cred.cr_gid;
361 acred.group_info = clp->cl_cred.cr_group_info;
363 dprintk("NFSD: looking up %s cred\n",
364 clnt->cl_auth->au_ops->au_name);
365 ret = rpcauth_lookup_credcache(clnt->cl_auth, &acred, taskflags);
366 put_group_info(clp->cl_cred.cr_group_info);
371 * Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
374 nfsd4_probe_callback(struct nfs4_client *clp)
376 struct sockaddr_in addr;
377 struct nfs4_callback *cb = &clp->cl_callback;
378 struct rpc_timeout timeparms;
379 struct rpc_xprt * xprt;
380 struct rpc_program * program = &cb->cb_program;
381 struct rpc_stat * stat = &cb->cb_stat;
382 struct rpc_clnt * clnt;
383 struct rpc_message msg = {
384 .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
390 dprintk("NFSD: probe_callback. cb_parsed %d cb_set %d\n",
391 cb->cb_parsed, atomic_read(&cb->cb_set));
392 if (!cb->cb_parsed || atomic_read(&cb->cb_set))
395 /* Initialize address */
396 memset(&addr, 0, sizeof(addr));
397 addr.sin_family = AF_INET;
398 addr.sin_port = htons(cb->cb_port);
399 addr.sin_addr.s_addr = htonl(cb->cb_addr);
401 /* Initialize timeout */
402 timeparms.to_initval = (NFSD_LEASE_TIME/4) * HZ;
403 timeparms.to_retries = 0;
404 timeparms.to_maxval = (NFSD_LEASE_TIME/2) * HZ;
405 timeparms.to_exponential = 1;
407 /* Create RPC transport */
408 xprt = xprt_create_proto(IPPROTO_TCP, &addr, &timeparms);
410 dprintk("NFSD: couldn't create callback transport!\n");
414 /* Initialize rpc_program */
415 program->name = "nfs4_cb";
416 program->number = cb->cb_prog;
417 program->nrvers = sizeof(nfs_cb_version)/sizeof(nfs_cb_version[0]);
418 program->version = nfs_cb_version;
419 program->stats = stat;
421 /* Initialize rpc_stat */
422 memset(stat, 0, sizeof(struct rpc_stat));
423 stat->program = program;
427 * XXX AUTH_UNIX only - need AUTH_GSS....
429 sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(addr.sin_addr.s_addr));
430 clnt = rpc_create_client(xprt, hostname, program, 1, RPC_AUTH_UNIX);
432 dprintk("NFSD: couldn't create callback client\n");
436 clnt->cl_softrtry = 1;
439 /* Kick rpciod, put the call on the wire. */
441 if (rpciod_up() != 0) {
442 dprintk("nfsd: couldn't start rpciod for callbacks!\n");
446 /* the task holds a reference to the nfs4_client struct */
447 cb->cb_client = clnt;
448 atomic_inc(&clp->cl_count);
450 msg.rpc_cred = nfsd4_lookupcred(clp,0);
451 if (IS_ERR(msg.rpc_cred))
453 status = rpc_call_async(clnt, &msg, RPC_TASK_ASYNC, nfs4_cb_null, NULL);
454 put_rpccred(msg.rpc_cred);
457 dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n");
463 atomic_dec(&clp->cl_count);
466 rpc_shutdown_client(clnt);
471 dprintk("NFSD: warning: no callback path to client %.*s\n",
472 (int)clp->cl_name.len, clp->cl_name.data);
473 cb->cb_client = NULL;
477 nfs4_cb_null(struct rpc_task *task)
479 struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
480 struct nfs4_callback *cb = &clp->cl_callback;
481 u32 addr = htonl(cb->cb_addr);
483 dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status);
485 if (task->tk_status < 0) {
486 dprintk("NFSD: callback establishment to client %.*s failed\n",
487 (int)clp->cl_name.len, clp->cl_name.data);
490 atomic_set(&cb->cb_set, 1);
491 dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr));
493 put_nfs4_client(clp);
497 * called with dp->dl_count inc'ed.
498 * nfs4_lock_state() may or may not have been called.
501 nfsd4_cb_recall(struct nfs4_delegation *dp)
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],
513 if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt)
516 msg.rpc_cred = nfsd4_lookupcred(clp, 0);
517 if (IS_ERR(msg.rpc_cred))
520 cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
523 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
527 /* Network partition? */
529 case -NFS4ERR_BAD_STATEID:
530 /* Race: client probably got cb_recall
531 * before open reply granting delegation */
537 status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
540 put_rpccred(msg.rpc_cred);
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);