Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
| 41 | #include <linux/sunrpc/xdr.h> |
| 42 | #include <linux/sunrpc/svc.h> |
| 43 | #include <linux/sunrpc/clnt.h> |
| 44 | #include <linux/nfsd/nfsd.h> |
| 45 | #include <linux/nfsd/state.h> |
| 46 | #include <linux/sunrpc/sched.h> |
| 47 | #include <linux/nfs4.h> |
| 48 | |
| 49 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 50 | |
| 51 | #define NFSPROC4_CB_NULL 0 |
| 52 | #define NFSPROC4_CB_COMPOUND 1 |
| 53 | |
| 54 | /* declarations */ |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 55 | static const struct rpc_call_ops nfs4_cb_null_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | /* Index of predefined Linux callback client operations */ |
| 58 | |
| 59 | enum { |
| 60 | NFSPROC4_CLNT_CB_NULL = 0, |
| 61 | NFSPROC4_CLNT_CB_RECALL, |
| 62 | }; |
| 63 | |
| 64 | enum nfs_cb_opnum4 { |
| 65 | OP_CB_RECALL = 4, |
| 66 | }; |
| 67 | |
| 68 | #define NFS4_MAXTAGLEN 20 |
| 69 | |
| 70 | #define NFS4_enc_cb_null_sz 0 |
| 71 | #define NFS4_dec_cb_null_sz 0 |
| 72 | #define cb_compound_enc_hdr_sz 4 |
| 73 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) |
| 74 | #define op_enc_sz 1 |
| 75 | #define op_dec_sz 2 |
| 76 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) |
| 77 | #define enc_stateid_sz 16 |
| 78 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
| 79 | 1 + enc_stateid_sz + \ |
| 80 | enc_nfs4_fh_sz) |
| 81 | |
| 82 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ |
| 83 | op_dec_sz) |
| 84 | |
| 85 | /* |
| 86 | * Generic encode routines from fs/nfs/nfs4xdr.c |
| 87 | */ |
| 88 | static inline u32 * |
| 89 | xdr_writemem(u32 *p, const void *ptr, int nbytes) |
| 90 | { |
| 91 | int tmp = XDR_QUADLEN(nbytes); |
| 92 | if (!tmp) |
| 93 | return p; |
| 94 | p[tmp-1] = 0; |
| 95 | memcpy(p, ptr, nbytes); |
| 96 | return p + tmp; |
| 97 | } |
| 98 | |
| 99 | #define WRITE32(n) *p++ = htonl(n) |
| 100 | #define WRITEMEM(ptr,nbytes) do { \ |
| 101 | p = xdr_writemem(p, ptr, nbytes); \ |
| 102 | } while (0) |
| 103 | #define RESERVE_SPACE(nbytes) do { \ |
| 104 | p = xdr_reserve_space(xdr, nbytes); \ |
| 105 | if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __FUNCTION__); \ |
| 106 | BUG_ON(!p); \ |
| 107 | } while (0) |
| 108 | |
| 109 | /* |
| 110 | * Generic decode routines from fs/nfs/nfs4xdr.c |
| 111 | */ |
| 112 | #define DECODE_TAIL \ |
| 113 | status = 0; \ |
| 114 | out: \ |
| 115 | return status; \ |
| 116 | xdr_error: \ |
| 117 | dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \ |
| 118 | status = -EIO; \ |
| 119 | goto out |
| 120 | |
| 121 | #define READ32(x) (x) = ntohl(*p++) |
| 122 | #define READ64(x) do { \ |
| 123 | (x) = (u64)ntohl(*p++) << 32; \ |
| 124 | (x) |= ntohl(*p++); \ |
| 125 | } while (0) |
| 126 | #define READTIME(x) do { \ |
| 127 | p++; \ |
| 128 | (x.tv_sec) = ntohl(*p++); \ |
| 129 | (x.tv_nsec) = ntohl(*p++); \ |
| 130 | } while (0) |
| 131 | #define READ_BUF(nbytes) do { \ |
| 132 | p = xdr_inline_decode(xdr, nbytes); \ |
| 133 | if (!p) { \ |
Greg Banks | 3e3b480 | 2006-10-02 02:17:41 -0700 | [diff] [blame] | 134 | dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | __FUNCTION__, __LINE__); \ |
| 136 | return -EIO; \ |
| 137 | } \ |
| 138 | } while (0) |
| 139 | |
| 140 | struct nfs4_cb_compound_hdr { |
| 141 | int status; |
| 142 | u32 ident; |
| 143 | u32 nops; |
| 144 | u32 taglen; |
| 145 | char * tag; |
| 146 | }; |
| 147 | |
| 148 | static struct { |
| 149 | int stat; |
| 150 | int errno; |
| 151 | } nfs_cb_errtbl[] = { |
| 152 | { NFS4_OK, 0 }, |
| 153 | { NFS4ERR_PERM, EPERM }, |
| 154 | { NFS4ERR_NOENT, ENOENT }, |
| 155 | { NFS4ERR_IO, EIO }, |
| 156 | { NFS4ERR_NXIO, ENXIO }, |
| 157 | { NFS4ERR_ACCESS, EACCES }, |
| 158 | { NFS4ERR_EXIST, EEXIST }, |
| 159 | { NFS4ERR_XDEV, EXDEV }, |
| 160 | { NFS4ERR_NOTDIR, ENOTDIR }, |
| 161 | { NFS4ERR_ISDIR, EISDIR }, |
| 162 | { NFS4ERR_INVAL, EINVAL }, |
| 163 | { NFS4ERR_FBIG, EFBIG }, |
| 164 | { NFS4ERR_NOSPC, ENOSPC }, |
| 165 | { NFS4ERR_ROFS, EROFS }, |
| 166 | { NFS4ERR_MLINK, EMLINK }, |
| 167 | { NFS4ERR_NAMETOOLONG, ENAMETOOLONG }, |
| 168 | { NFS4ERR_NOTEMPTY, ENOTEMPTY }, |
| 169 | { NFS4ERR_DQUOT, EDQUOT }, |
| 170 | { NFS4ERR_STALE, ESTALE }, |
| 171 | { NFS4ERR_BADHANDLE, EBADHANDLE }, |
| 172 | { NFS4ERR_BAD_COOKIE, EBADCOOKIE }, |
| 173 | { NFS4ERR_NOTSUPP, ENOTSUPP }, |
| 174 | { NFS4ERR_TOOSMALL, ETOOSMALL }, |
| 175 | { NFS4ERR_SERVERFAULT, ESERVERFAULT }, |
| 176 | { NFS4ERR_BADTYPE, EBADTYPE }, |
| 177 | { NFS4ERR_LOCKED, EAGAIN }, |
| 178 | { NFS4ERR_RESOURCE, EREMOTEIO }, |
| 179 | { NFS4ERR_SYMLINK, ELOOP }, |
| 180 | { NFS4ERR_OP_ILLEGAL, EOPNOTSUPP }, |
| 181 | { NFS4ERR_DEADLOCK, EDEADLK }, |
| 182 | { -1, EIO } |
| 183 | }; |
| 184 | |
| 185 | static int |
| 186 | nfs_cb_stat_to_errno(int stat) |
| 187 | { |
| 188 | int i; |
| 189 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { |
| 190 | if (nfs_cb_errtbl[i].stat == stat) |
| 191 | return nfs_cb_errtbl[i].errno; |
| 192 | } |
| 193 | /* If we cannot translate the error, the recovery routines should |
| 194 | * handle it. |
| 195 | * Note: remaining NFSv4 error codes have values > 10000, so should |
| 196 | * not conflict with native Linux error codes. |
| 197 | */ |
| 198 | return stat; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * XDR encode |
| 203 | */ |
| 204 | |
| 205 | static int |
| 206 | encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr) |
| 207 | { |
| 208 | u32 * p; |
| 209 | |
| 210 | RESERVE_SPACE(16); |
| 211 | WRITE32(0); /* tag length is always 0 */ |
| 212 | WRITE32(NFS4_MINOR_VERSION); |
| 213 | WRITE32(hdr->ident); |
| 214 | WRITE32(hdr->nops); |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static int |
| 219 | encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec) |
| 220 | { |
| 221 | u32 *p; |
| 222 | int len = cb_rec->cbr_fhlen; |
| 223 | |
| 224 | RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len); |
| 225 | WRITE32(OP_CB_RECALL); |
| 226 | WRITEMEM(&cb_rec->cbr_stateid, sizeof(stateid_t)); |
| 227 | WRITE32(cb_rec->cbr_trunc); |
| 228 | WRITE32(len); |
| 229 | WRITEMEM(cb_rec->cbr_fhval, len); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static int |
| 234 | nfs4_xdr_enc_cb_null(struct rpc_rqst *req, u32 *p) |
| 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 |
| 244 | nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, u32 *p, struct nfs4_cb_recall *args) |
| 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){ |
| 260 | u32 *p; |
| 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 | { |
| 275 | u32 *p; |
| 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 |
| 294 | nfs4_xdr_dec_cb_null(struct rpc_rqst *req, u32 *p) |
| 295 | { |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static int |
| 300 | nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, u32 *p) |
| 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 | */ |
| 318 | #ifndef MAX |
| 319 | # define MAX(a, b) (((a) > (b))? (a) : (b)) |
| 320 | #endif |
| 321 | |
| 322 | #define PROC(proc, call, argtype, restype) \ |
| 323 | [NFSPROC4_CLNT_##proc] = { \ |
| 324 | .p_proc = NFSPROC4_CB_##call, \ |
| 325 | .p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \ |
| 326 | .p_decode = (kxdrproc_t) nfs4_xdr_##restype, \ |
| 327 | .p_bufsiz = MAX(NFS4_##argtype##_sz,NFS4_##restype##_sz) << 2, \ |
Chuck Lever | cc0175c | 2006-03-20 13:44:22 -0500 | [diff] [blame] | 328 | .p_statidx = NFSPROC4_CB_##call, \ |
| 329 | .p_name = #proc, \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | } |
| 331 | |
NeilBrown | fd39ca9 | 2005-06-23 22:04:03 -0700 | [diff] [blame] | 332 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null), |
| 334 | PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall), |
| 335 | }; |
| 336 | |
NeilBrown | fd39ca9 | 2005-06-23 22:04:03 -0700 | [diff] [blame] | 337 | static struct rpc_version nfs_cb_version4 = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | .number = 1, |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 339 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | .procs = nfs4_cb_procedures |
| 341 | }; |
| 342 | |
| 343 | static struct rpc_version * nfs_cb_version[] = { |
| 344 | NULL, |
| 345 | &nfs_cb_version4, |
| 346 | }; |
| 347 | |
| 348 | /* |
| 349 | * Use the SETCLIENTID credential |
| 350 | */ |
NeilBrown | fd39ca9 | 2005-06-23 22:04:03 -0700 | [diff] [blame] | 351 | static struct rpc_cred * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | nfsd4_lookupcred(struct nfs4_client *clp, int taskflags) |
| 353 | { |
| 354 | struct auth_cred acred; |
| 355 | struct rpc_clnt *clnt = clp->cl_callback.cb_client; |
| 356 | struct rpc_cred *ret; |
| 357 | |
| 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; |
| 362 | |
| 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); |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Set up the callback client and put a NFSPROC4_CB_NULL on the wire... |
| 372 | */ |
| 373 | void |
| 374 | nfsd4_probe_callback(struct nfs4_client *clp) |
| 375 | { |
| 376 | struct sockaddr_in addr; |
| 377 | struct nfs4_callback *cb = &clp->cl_callback; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 378 | struct rpc_timeout timeparms = { |
| 379 | .to_initval = (NFSD_LEASE_TIME/4) * HZ, |
| 380 | .to_retries = 5, |
| 381 | .to_maxval = (NFSD_LEASE_TIME/2) * HZ, |
| 382 | .to_exponential = 1, |
| 383 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | struct rpc_program * program = &cb->cb_program; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 385 | struct rpc_create_args args = { |
| 386 | .protocol = IPPROTO_TCP, |
| 387 | .address = (struct sockaddr *)&addr, |
| 388 | .addrsize = sizeof(addr), |
| 389 | .timeout = &timeparms, |
| 390 | .servername = clp->cl_name.data, |
| 391 | .program = program, |
| 392 | .version = nfs_cb_version[1]->number, |
| 393 | .authflavor = RPC_AUTH_UNIX, /* XXX: need AUTH_GSS... */ |
| 394 | .flags = (RPC_CLNT_CREATE_NOPING), |
| 395 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | struct rpc_message msg = { |
| 397 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL], |
| 398 | .rpc_argp = clp, |
| 399 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | int status; |
| 401 | |
NeilBrown | cb36d63 | 2005-06-23 22:04:23 -0700 | [diff] [blame] | 402 | if (atomic_read(&cb->cb_set)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return; |
| 404 | |
| 405 | /* Initialize address */ |
| 406 | memset(&addr, 0, sizeof(addr)); |
| 407 | addr.sin_family = AF_INET; |
| 408 | addr.sin_port = htons(cb->cb_port); |
| 409 | addr.sin_addr.s_addr = htonl(cb->cb_addr); |
| 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | /* Initialize rpc_program */ |
| 412 | program->name = "nfs4_cb"; |
| 413 | program->number = cb->cb_prog; |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 414 | program->nrvers = ARRAY_SIZE(nfs_cb_version); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | program->version = nfs_cb_version; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 416 | program->stats = &cb->cb_stat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | /* Initialize rpc_stat */ |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 419 | memset(program->stats, 0, sizeof(cb->cb_stat)); |
| 420 | program->stats->program = program; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 422 | /* Create RPC client */ |
| 423 | cb->cb_client = rpc_create(&args); |
J. Bruce Fields | 0942176 | 2006-10-17 00:10:16 -0700 | [diff] [blame] | 424 | if (IS_ERR(cb->cb_client)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | dprintk("NFSD: couldn't create callback client\n"); |
Trond Myklebust | 5b616f5 | 2005-06-22 17:16:20 +0000 | [diff] [blame] | 426 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | /* Kick rpciod, put the call on the wire. */ |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 430 | if (rpciod_up() != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | goto out_clnt; |
NeilBrown | 541e0e0 | 2006-04-10 22:55:38 -0700 | [diff] [blame] | 432 | |
| 433 | /* the task holds a reference to the nfs4_client struct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | atomic_inc(&clp->cl_count); |
| 435 | |
| 436 | msg.rpc_cred = nfsd4_lookupcred(clp,0); |
| 437 | if (IS_ERR(msg.rpc_cred)) |
| 438 | goto out_rpciod; |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 439 | status = rpc_call_async(cb->cb_client, &msg, RPC_TASK_ASYNC, &nfs4_cb_null_ops, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | put_rpccred(msg.rpc_cred); |
| 441 | |
| 442 | if (status != 0) { |
| 443 | dprintk("NFSD: asynchronous NFSPROC4_CB_NULL failed!\n"); |
| 444 | goto out_rpciod; |
| 445 | } |
| 446 | return; |
| 447 | |
| 448 | out_rpciod: |
| 449 | atomic_dec(&clp->cl_count); |
| 450 | rpciod_down(); |
| 451 | out_clnt: |
Chuck Lever | ae5c794 | 2006-08-22 20:06:21 -0400 | [diff] [blame] | 452 | rpc_shutdown_client(cb->cb_client); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | out_err: |
J. Bruce Fields | 0942176 | 2006-10-17 00:10:16 -0700 | [diff] [blame] | 454 | cb->cb_client = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | dprintk("NFSD: warning: no callback path to client %.*s\n", |
| 456 | (int)clp->cl_name.len, clp->cl_name.data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | static void |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 460 | nfs4_cb_null(struct rpc_task *task, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | { |
| 462 | struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; |
| 463 | struct nfs4_callback *cb = &clp->cl_callback; |
| 464 | u32 addr = htonl(cb->cb_addr); |
| 465 | |
| 466 | dprintk("NFSD: nfs4_cb_null task->tk_status %d\n", task->tk_status); |
| 467 | |
| 468 | if (task->tk_status < 0) { |
| 469 | dprintk("NFSD: callback establishment to client %.*s failed\n", |
| 470 | (int)clp->cl_name.len, clp->cl_name.data); |
| 471 | goto out; |
| 472 | } |
| 473 | atomic_set(&cb->cb_set, 1); |
| 474 | dprintk("NFSD: callback set to client %u.%u.%u.%u\n", NIPQUAD(addr)); |
| 475 | out: |
| 476 | put_nfs4_client(clp); |
| 477 | } |
| 478 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 479 | static const struct rpc_call_ops nfs4_cb_null_ops = { |
| 480 | .rpc_call_done = nfs4_cb_null, |
| 481 | }; |
| 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | /* |
| 484 | * called with dp->dl_count inc'ed. |
| 485 | * nfs4_lock_state() may or may not have been called. |
| 486 | */ |
| 487 | void |
| 488 | nfsd4_cb_recall(struct nfs4_delegation *dp) |
| 489 | { |
| 490 | struct nfs4_client *clp = dp->dl_client; |
| 491 | struct rpc_clnt *clnt = clp->cl_callback.cb_client; |
| 492 | struct nfs4_cb_recall *cbr = &dp->dl_recall; |
| 493 | struct rpc_message msg = { |
| 494 | .rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL], |
| 495 | .rpc_argp = cbr, |
| 496 | }; |
| 497 | int retries = 1; |
| 498 | int status = 0; |
| 499 | |
| 500 | if ((!atomic_read(&clp->cl_callback.cb_set)) || !clnt) |
| 501 | return; |
| 502 | |
| 503 | msg.rpc_cred = nfsd4_lookupcred(clp, 0); |
| 504 | if (IS_ERR(msg.rpc_cred)) |
| 505 | goto out; |
| 506 | |
| 507 | cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */ |
| 508 | cbr->cbr_dp = dp; |
| 509 | |
| 510 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); |
| 511 | while (retries--) { |
| 512 | switch (status) { |
| 513 | case -EIO: |
| 514 | /* Network partition? */ |
| 515 | case -EBADHANDLE: |
| 516 | case -NFS4ERR_BAD_STATEID: |
| 517 | /* Race: client probably got cb_recall |
| 518 | * before open reply granting delegation */ |
| 519 | break; |
| 520 | default: |
| 521 | goto out_put_cred; |
| 522 | } |
| 523 | ssleep(2); |
| 524 | status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT); |
| 525 | } |
| 526 | out_put_cred: |
| 527 | put_rpccred(msg.rpc_cred); |
| 528 | out: |
| 529 | if (status == -EIO) |
| 530 | atomic_set(&clp->cl_callback.cb_set, 0); |
| 531 | /* Success or failure, now we're either waiting for lease expiration |
| 532 | * or deleg_return. */ |
| 533 | dprintk("NFSD: nfs4_cb_recall: dp %p dl_flock %p dl_count %d\n",dp, dp->dl_flock, atomic_read(&dp->dl_count)); |
| 534 | nfs4_put_delegation(dp); |
| 535 | return; |
| 536 | } |