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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (c) 2001 The Regents of the University of Michigan. |
3 | * All rights reserved. | |
4 | * | |
5 | * Kendrick Smith <kmsmith@umich.edu> | |
6 | * Andy Adamson <andros@umich.edu> | |
7 | * | |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. Neither the name of the University nor the names of its | |
18 | * contributors may be used to endorse or promote products derived | |
19 | * from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 | */ | |
33 | ||
1da177e4 | 34 | #include <linux/sunrpc/clnt.h> |
d531c008 | 35 | #include <linux/sunrpc/xprt.h> |
b5a1a81e | 36 | #include <linux/sunrpc/svc_xprt.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
9a74af21 BH |
38 | #include "nfsd.h" |
39 | #include "state.h" | |
3d733711 | 40 | #include "netns.h" |
06b332a5 | 41 | #include "xdr4cb.h" |
1da177e4 LT |
42 | |
43 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
44 | ||
5423732a BH |
45 | static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
46 | ||
1da177e4 LT |
47 | #define NFSPROC4_CB_NULL 0 |
48 | #define NFSPROC4_CB_COMPOUND 1 | |
49 | ||
1da177e4 LT |
50 | /* Index of predefined Linux callback client operations */ |
51 | ||
52 | enum { | |
4be36ca0 | 53 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 54 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 55 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
56 | }; |
57 | ||
1da177e4 | 58 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
59 | /* args */ |
60 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 61 | u32 nops; |
ef52bff8 | 62 | __be32 *nops_p; |
ab52ae6d | 63 | u32 minorversion; |
38524ab3 AA |
64 | /* res */ |
65 | int status; | |
1da177e4 LT |
66 | }; |
67 | ||
85a56480 CL |
68 | /* |
69 | * Handle decode buffer overflows out-of-line. | |
70 | */ | |
71 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) | |
1da177e4 | 72 | { |
85a56480 CL |
73 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
74 | "Remaining buffer length is %tu words.\n", | |
75 | func, xdr->end - xdr->p); | |
1da177e4 LT |
76 | } |
77 | ||
a033db48 CL |
78 | static __be32 *xdr_encode_empty_array(__be32 *p) |
79 | { | |
80 | *p++ = xdr_zero; | |
81 | return p; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Encode/decode NFSv4 CB basic data types | |
86 | * | |
87 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
88 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
89 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
90 | * 1 Protocol" | |
91 | */ | |
92 | ||
93 | /* | |
94 | * nfs_cb_opnum4 | |
95 | * | |
96 | * enum nfs_cb_opnum4 { | |
97 | * OP_CB_GETATTR = 3, | |
98 | * ... | |
99 | * }; | |
100 | */ | |
101 | enum nfs_cb_opnum4 { | |
102 | OP_CB_GETATTR = 3, | |
103 | OP_CB_RECALL = 4, | |
104 | OP_CB_LAYOUTRECALL = 5, | |
105 | OP_CB_NOTIFY = 6, | |
106 | OP_CB_PUSH_DELEG = 7, | |
107 | OP_CB_RECALL_ANY = 8, | |
108 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
109 | OP_CB_RECALL_SLOT = 10, | |
110 | OP_CB_SEQUENCE = 11, | |
111 | OP_CB_WANTS_CANCELLED = 12, | |
112 | OP_CB_NOTIFY_LOCK = 13, | |
113 | OP_CB_NOTIFY_DEVICEID = 14, | |
114 | OP_CB_ILLEGAL = 10044 | |
115 | }; | |
116 | ||
117 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
118 | { | |
119 | __be32 *p; | |
120 | ||
121 | p = xdr_reserve_space(xdr, 4); | |
122 | *p = cpu_to_be32(op); | |
123 | } | |
124 | ||
125 | /* | |
126 | * nfs_fh4 | |
127 | * | |
128 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
129 | */ | |
130 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
131 | { | |
132 | u32 length = fh->fh_size; | |
133 | __be32 *p; | |
134 | ||
135 | BUG_ON(length > NFS4_FHSIZE); | |
136 | p = xdr_reserve_space(xdr, 4 + length); | |
137 | xdr_encode_opaque(p, &fh->fh_base, length); | |
138 | } | |
139 | ||
1da177e4 | 140 | /* |
a033db48 CL |
141 | * stateid4 |
142 | * | |
143 | * struct stateid4 { | |
144 | * uint32_t seqid; | |
145 | * opaque other[12]; | |
146 | * }; | |
1da177e4 | 147 | */ |
a033db48 CL |
148 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
149 | { | |
150 | __be32 *p; | |
1da177e4 | 151 | |
a033db48 CL |
152 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
153 | *p++ = cpu_to_be32(sid->si_generation); | |
154 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
155 | } | |
156 | ||
157 | /* | |
158 | * sessionid4 | |
159 | * | |
160 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
161 | */ | |
162 | static void encode_sessionid4(struct xdr_stream *xdr, | |
163 | const struct nfsd4_session *session) | |
9303bbd3 BH |
164 | { |
165 | __be32 *p; | |
166 | ||
a033db48 CL |
167 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
168 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
169 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
170 | } |
171 | ||
85a56480 CL |
172 | /* |
173 | * nfsstat4 | |
174 | */ | |
175 | static const struct { | |
176 | int stat; | |
177 | int errno; | |
178 | } nfs_cb_errtbl[] = { | |
179 | { NFS4_OK, 0 }, | |
180 | { NFS4ERR_PERM, -EPERM }, | |
181 | { NFS4ERR_NOENT, -ENOENT }, | |
182 | { NFS4ERR_IO, -EIO }, | |
183 | { NFS4ERR_NXIO, -ENXIO }, | |
184 | { NFS4ERR_ACCESS, -EACCES }, | |
185 | { NFS4ERR_EXIST, -EEXIST }, | |
186 | { NFS4ERR_XDEV, -EXDEV }, | |
187 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
188 | { NFS4ERR_ISDIR, -EISDIR }, | |
189 | { NFS4ERR_INVAL, -EINVAL }, | |
190 | { NFS4ERR_FBIG, -EFBIG }, | |
191 | { NFS4ERR_NOSPC, -ENOSPC }, | |
192 | { NFS4ERR_ROFS, -EROFS }, | |
193 | { NFS4ERR_MLINK, -EMLINK }, | |
194 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
195 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
196 | { NFS4ERR_DQUOT, -EDQUOT }, | |
197 | { NFS4ERR_STALE, -ESTALE }, | |
198 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
199 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
200 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
201 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
202 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
203 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
204 | { NFS4ERR_LOCKED, -EAGAIN }, | |
205 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
206 | { NFS4ERR_SYMLINK, -ELOOP }, | |
207 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
208 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
209 | { -1, -EIO } | |
210 | }; | |
211 | ||
212 | /* | |
213 | * If we cannot translate the error, the recovery routines should | |
214 | * handle it. | |
215 | * | |
216 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
217 | * not conflict with native Linux error codes. | |
218 | */ | |
219 | static int nfs_cb_stat_to_errno(int status) | |
220 | { | |
221 | int i; | |
222 | ||
223 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
224 | if (nfs_cb_errtbl[i].stat == status) | |
225 | return nfs_cb_errtbl[i].errno; | |
226 | } | |
227 | ||
228 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
229 | return -status; | |
230 | } | |
231 | ||
232 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, | |
233 | enum nfsstat4 *status) | |
234 | { | |
235 | __be32 *p; | |
236 | u32 op; | |
237 | ||
238 | p = xdr_inline_decode(xdr, 4 + 4); | |
239 | if (unlikely(p == NULL)) | |
240 | goto out_overflow; | |
241 | op = be32_to_cpup(p++); | |
242 | if (unlikely(op != expected)) | |
243 | goto out_unexpected; | |
244 | *status = be32_to_cpup(p); | |
245 | return 0; | |
246 | out_overflow: | |
247 | print_overflow_msg(__func__, xdr); | |
248 | return -EIO; | |
249 | out_unexpected: | |
250 | dprintk("NFSD: Callback server returned operation %d but " | |
251 | "we issued a request for %d\n", op, expected); | |
252 | return -EIO; | |
253 | } | |
254 | ||
a033db48 CL |
255 | /* |
256 | * CB_COMPOUND4args | |
257 | * | |
258 | * struct CB_COMPOUND4args { | |
259 | * utf8str_cs tag; | |
260 | * uint32_t minorversion; | |
261 | * uint32_t callback_ident; | |
262 | * nfs_cb_argop4 argarray<>; | |
263 | * }; | |
264 | */ | |
265 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
266 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 267 | { |
f00f328f | 268 | __be32 * p; |
1da177e4 | 269 | |
a033db48 CL |
270 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
271 | p = xdr_encode_empty_array(p); /* empty tag */ | |
272 | *p++ = cpu_to_be32(hdr->minorversion); | |
273 | *p++ = cpu_to_be32(hdr->ident); | |
274 | ||
ef52bff8 | 275 | hdr->nops_p = p; |
a033db48 | 276 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
277 | } |
278 | ||
a033db48 CL |
279 | /* |
280 | * Update argarray element count | |
281 | */ | |
ef52bff8 AA |
282 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
283 | { | |
a033db48 CL |
284 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
285 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
286 | } |
287 | ||
85a56480 CL |
288 | /* |
289 | * CB_COMPOUND4res | |
290 | * | |
291 | * struct CB_COMPOUND4res { | |
292 | * nfsstat4 status; | |
293 | * utf8str_cs tag; | |
294 | * nfs_cb_resop4 resarray<>; | |
295 | * }; | |
296 | */ | |
297 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
298 | struct nfs4_cb_compound_hdr *hdr) | |
299 | { | |
300 | u32 length; | |
301 | __be32 *p; | |
302 | ||
303 | p = xdr_inline_decode(xdr, 4 + 4); | |
304 | if (unlikely(p == NULL)) | |
305 | goto out_overflow; | |
306 | hdr->status = be32_to_cpup(p++); | |
307 | /* Ignore the tag */ | |
308 | length = be32_to_cpup(p++); | |
309 | p = xdr_inline_decode(xdr, length + 4); | |
310 | if (unlikely(p == NULL)) | |
311 | goto out_overflow; | |
312 | hdr->nops = be32_to_cpup(p); | |
313 | return 0; | |
314 | out_overflow: | |
315 | print_overflow_msg(__func__, xdr); | |
316 | return -EIO; | |
317 | } | |
318 | ||
a033db48 CL |
319 | /* |
320 | * CB_RECALL4args | |
321 | * | |
322 | * struct CB_RECALL4args { | |
323 | * stateid4 stateid; | |
324 | * bool truncate; | |
325 | * nfs_fh4 fh; | |
326 | * }; | |
327 | */ | |
328 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
329 | const struct nfs4_delegation *dp, | |
330 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 331 | { |
f00f328f | 332 | __be32 *p; |
a033db48 CL |
333 | |
334 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 335 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
336 | |
337 | p = xdr_reserve_space(xdr, 4); | |
338 | *p++ = xdr_zero; /* truncate */ | |
339 | ||
340 | encode_nfs_fh4(xdr, &dp->dl_fh); | |
341 | ||
ef52bff8 | 342 | hdr->nops++; |
1da177e4 LT |
343 | } |
344 | ||
a033db48 CL |
345 | /* |
346 | * CB_SEQUENCE4args | |
347 | * | |
348 | * struct CB_SEQUENCE4args { | |
349 | * sessionid4 csa_sessionid; | |
350 | * sequenceid4 csa_sequenceid; | |
351 | * slotid4 csa_slotid; | |
352 | * slotid4 csa_highest_slotid; | |
353 | * bool csa_cachethis; | |
354 | * referring_call_list4 csa_referring_call_lists<>; | |
355 | * }; | |
356 | */ | |
357 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
358 | const struct nfsd4_callback *cb, | |
359 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 360 | { |
a033db48 | 361 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
362 | __be32 *p; |
363 | ||
364 | if (hdr->minorversion == 0) | |
365 | return; | |
366 | ||
a033db48 CL |
367 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
368 | encode_sessionid4(xdr, session); | |
369 | ||
370 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
371 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
372 | *p++ = xdr_zero; /* csa_slotid */ | |
373 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
374 | *p++ = xdr_zero; /* csa_cachethis */ | |
375 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 376 | |
2af73580 BH |
377 | hdr->nops++; |
378 | } | |
379 | ||
85a56480 CL |
380 | /* |
381 | * CB_SEQUENCE4resok | |
382 | * | |
383 | * struct CB_SEQUENCE4resok { | |
384 | * sessionid4 csr_sessionid; | |
385 | * sequenceid4 csr_sequenceid; | |
386 | * slotid4 csr_slotid; | |
387 | * slotid4 csr_highest_slotid; | |
388 | * slotid4 csr_target_highest_slotid; | |
389 | * }; | |
390 | * | |
391 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
392 | * case NFS4_OK: | |
393 | * CB_SEQUENCE4resok csr_resok4; | |
394 | * default: | |
395 | * void; | |
396 | * }; | |
397 | * | |
398 | * Our current back channel implmentation supports a single backchannel | |
399 | * with a single slot. | |
400 | */ | |
401 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
402 | struct nfsd4_callback *cb) | |
403 | { | |
404 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
405 | struct nfs4_sessionid id; | |
406 | int status; | |
407 | __be32 *p; | |
408 | u32 dummy; | |
409 | ||
410 | status = -ESERVERFAULT; | |
411 | ||
412 | /* | |
413 | * If the server returns different values for sessionID, slotID or | |
414 | * sequence number, the server is looney tunes. | |
415 | */ | |
2c9c8f36 | 416 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
417 | if (unlikely(p == NULL)) |
418 | goto out_overflow; | |
419 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
420 | if (memcmp(id.data, session->se_sessionid.data, | |
421 | NFS4_MAX_SESSIONID_LEN) != 0) { | |
422 | dprintk("NFS: %s Invalid session id\n", __func__); | |
423 | goto out; | |
424 | } | |
425 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
426 | ||
427 | dummy = be32_to_cpup(p++); | |
428 | if (dummy != session->se_cb_seq_nr) { | |
429 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
430 | goto out; | |
431 | } | |
432 | ||
433 | dummy = be32_to_cpup(p++); | |
434 | if (dummy != 0) { | |
435 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
436 | goto out; | |
437 | } | |
438 | ||
439 | /* | |
440 | * FIXME: process highest slotid and target highest slotid | |
441 | */ | |
442 | status = 0; | |
443 | out: | |
5423732a BH |
444 | if (status) |
445 | nfsd4_mark_cb_fault(cb->cb_clp, status); | |
85a56480 CL |
446 | return status; |
447 | out_overflow: | |
448 | print_overflow_msg(__func__, xdr); | |
449 | return -EIO; | |
450 | } | |
451 | ||
452 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
453 | struct nfsd4_callback *cb) | |
454 | { | |
455 | enum nfsstat4 nfserr; | |
456 | int status; | |
457 | ||
458 | if (cb->cb_minorversion == 0) | |
459 | return 0; | |
460 | ||
461 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); | |
462 | if (unlikely(status)) | |
463 | goto out; | |
464 | if (unlikely(nfserr != NFS4_OK)) | |
465 | goto out_default; | |
466 | status = decode_cb_sequence4resok(xdr, cb); | |
467 | out: | |
468 | return status; | |
469 | out_default: | |
0af3f814 | 470 | return nfs_cb_stat_to_errno(nfserr); |
85a56480 CL |
471 | } |
472 | ||
a033db48 CL |
473 | /* |
474 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
475 | * | |
476 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
477 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
478 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
479 | * Protocol". | |
480 | */ | |
481 | ||
482 | /* | |
483 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
484 | */ | |
9f06c719 CL |
485 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
486 | void *__unused) | |
1da177e4 | 487 | { |
a033db48 | 488 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
489 | } |
490 | ||
a033db48 CL |
491 | /* |
492 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
493 | */ | |
9f06c719 CL |
494 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
495 | const struct nfsd4_callback *cb) | |
1da177e4 | 496 | { |
a033db48 | 497 | const struct nfs4_delegation *args = cb->cb_op; |
1da177e4 | 498 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 499 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 500 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
501 | }; |
502 | ||
9f06c719 CL |
503 | encode_cb_compound4args(xdr, &hdr); |
504 | encode_cb_sequence4args(xdr, cb, &hdr); | |
505 | encode_cb_recall4args(xdr, args, &hdr); | |
ef52bff8 | 506 | encode_cb_nops(&hdr); |
1da177e4 LT |
507 | } |
508 | ||
509 | ||
2af73580 | 510 | /* |
85a56480 CL |
511 | * NFSv4.0 and NFSv4.1 XDR decode functions |
512 | * | |
513 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
514 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
515 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
516 | * Protocol". | |
2af73580 | 517 | */ |
2af73580 | 518 | |
bf269551 CL |
519 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
520 | void *__unused) | |
1da177e4 LT |
521 | { |
522 | return 0; | |
523 | } | |
524 | ||
85a56480 CL |
525 | /* |
526 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
527 | */ | |
bf269551 CL |
528 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
529 | struct xdr_stream *xdr, | |
85a56480 | 530 | struct nfsd4_callback *cb) |
1da177e4 | 531 | { |
1da177e4 | 532 | struct nfs4_cb_compound_hdr hdr; |
85a56480 | 533 | enum nfsstat4 nfserr; |
1da177e4 LT |
534 | int status; |
535 | ||
bf269551 | 536 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 537 | if (unlikely(status)) |
1da177e4 | 538 | goto out; |
85a56480 CL |
539 | |
540 | if (cb != NULL) { | |
bf269551 | 541 | status = decode_cb_sequence4res(xdr, cb); |
85a56480 | 542 | if (unlikely(status)) |
0421b5c5 RL |
543 | goto out; |
544 | } | |
85a56480 | 545 | |
bf269551 | 546 | status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); |
85a56480 CL |
547 | if (unlikely(status)) |
548 | goto out; | |
549 | if (unlikely(nfserr != NFS4_OK)) | |
0af3f814 | 550 | status = nfs_cb_stat_to_errno(nfserr); |
1da177e4 LT |
551 | out: |
552 | return status; | |
553 | } | |
554 | ||
555 | /* | |
556 | * RPC procedure tables | |
557 | */ | |
7d93bd71 CL |
558 | #define PROC(proc, call, argtype, restype) \ |
559 | [NFSPROC4_CLNT_##proc] = { \ | |
560 | .p_proc = NFSPROC4_CB_##call, \ | |
9f06c719 | 561 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
bf269551 | 562 | .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
563 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
564 | .p_replen = NFS4_dec_##restype##_sz, \ | |
565 | .p_statidx = NFSPROC4_CB_##call, \ | |
566 | .p_name = #proc, \ | |
1da177e4 LT |
567 | } |
568 | ||
7d93bd71 CL |
569 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
570 | PROC(CB_NULL, NULL, cb_null, cb_null), | |
571 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
1da177e4 LT |
572 | }; |
573 | ||
7d93bd71 | 574 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
575 | /* |
576 | * Note on the callback rpc program version number: despite language in rfc | |
577 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
578 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
579 | * in practice that appears to be what implementations use. The section | |
580 | * 18.36.3 language is expected to be fixed in an erratum. | |
581 | */ | |
7d93bd71 CL |
582 | .number = 1, |
583 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
584 | .procs = nfs4_cb_procedures | |
1da177e4 LT |
585 | }; |
586 | ||
a613fa16 | 587 | static const struct rpc_version *nfs_cb_version[] = { |
1da177e4 LT |
588 | &nfs_cb_version4, |
589 | }; | |
590 | ||
a613fa16 | 591 | static const struct rpc_program cb_program; |
ff7d9756 OK |
592 | |
593 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 594 | .program = &cb_program |
ff7d9756 OK |
595 | }; |
596 | ||
597 | #define NFS4_CALLBACK 0x40000000 | |
a613fa16 | 598 | static const struct rpc_program cb_program = { |
7d93bd71 CL |
599 | .name = "nfs4_cb", |
600 | .number = NFS4_CALLBACK, | |
601 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
602 | .version = nfs_cb_version, | |
603 | .stats = &cb_stats, | |
0157d021 | 604 | .pipe_dir_name = "nfsd4_cb", |
ff7d9756 OK |
605 | }; |
606 | ||
3d733711 | 607 | static int max_cb_time(struct net *net) |
595947ac | 608 | { |
3d733711 SK |
609 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
610 | return max(nn->nfsd4_lease/10, (time_t)1) * HZ; | |
595947ac BF |
611 | } |
612 | ||
c6bb3ca2 BF |
613 | static struct rpc_cred *callback_cred; |
614 | ||
615 | int set_callback_cred(void) | |
616 | { | |
617 | if (callback_cred) | |
618 | return 0; | |
619 | callback_cred = rpc_lookup_machine_cred("nfs"); | |
620 | if (!callback_cred) | |
621 | return -ENOMEM; | |
622 | return 0; | |
623 | } | |
624 | ||
2b4cf668 | 625 | static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
c6bb3ca2 BF |
626 | { |
627 | if (clp->cl_minorversion == 0) { | |
628 | return get_rpccred(callback_cred); | |
629 | } else { | |
630 | struct rpc_auth *auth = client->cl_auth; | |
631 | struct auth_cred acred = {}; | |
632 | ||
633 | acred.uid = ses->se_cb_sec.uid; | |
634 | acred.gid = ses->se_cb_sec.gid; | |
635 | return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0); | |
636 | } | |
637 | } | |
2b47eece | 638 | |
d531c008 KM |
639 | static struct rpc_clnt *create_backchannel_client(struct rpc_create_args *args) |
640 | { | |
641 | struct rpc_xprt *xprt; | |
642 | ||
643 | if (args->protocol != XPRT_TRANSPORT_BC_TCP) | |
644 | return rpc_create(args); | |
645 | ||
646 | xprt = args->bc_xprt->xpt_bc_xprt; | |
647 | if (xprt) { | |
648 | xprt_get(xprt); | |
649 | return rpc_create_xprt(args, xprt); | |
650 | } | |
651 | ||
652 | return rpc_create(args); | |
653 | } | |
654 | ||
dcbeaa68 | 655 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 656 | { |
ae5c7947 | 657 | struct rpc_timeout timeparms = { |
3d733711 | 658 | .to_initval = max_cb_time(clp->net), |
595947ac | 659 | .to_retries = 0, |
ae5c7947 | 660 | }; |
ae5c7947 | 661 | struct rpc_create_args args = { |
c212cecf | 662 | .net = clp->net, |
07263f1e BF |
663 | .address = (struct sockaddr *) &conn->cb_addr, |
664 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 665 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 666 | .timeout = &timeparms, |
ff7d9756 | 667 | .program = &cb_program, |
b7299f44 | 668 | .version = 0, |
b6b6152c | 669 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 670 | }; |
63c86716 | 671 | struct rpc_clnt *client; |
c6bb3ca2 | 672 | struct rpc_cred *cred; |
1da177e4 | 673 | |
5d18c1c2 | 674 | if (clp->cl_minorversion == 0) { |
03a4e1f6 | 675 | if (!clp->cl_cred.cr_principal && |
39307655 | 676 | (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) |
5d18c1c2 | 677 | return -EINVAL; |
03a4e1f6 | 678 | args.client_name = clp->cl_cred.cr_principal; |
5d18c1c2 BF |
679 | args.prognumber = conn->cb_prog, |
680 | args.protocol = XPRT_TRANSPORT_TCP; | |
39307655 | 681 | args.authflavor = clp->cl_cred.cr_flavor; |
5d18c1c2 BF |
682 | clp->cl_cb_ident = conn->cb_ident; |
683 | } else { | |
dcbeaa68 BF |
684 | if (!conn->cb_xprt) |
685 | return -EINVAL; | |
686 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
687 | clp->cl_cb_session = ses; | |
07263f1e | 688 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 689 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3ddc8bf5 | 690 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
12fc3e92 | 691 | args.authflavor = ses->se_cb_sec.flavor; |
3ddc8bf5 | 692 | } |
ae5c7947 | 693 | /* Create RPC client */ |
d531c008 | 694 | client = create_backchannel_client(&args); |
e1cab5a5 | 695 | if (IS_ERR(client)) { |
a601caed BF |
696 | dprintk("NFSD: couldn't create callback client: %ld\n", |
697 | PTR_ERR(client)); | |
e1cab5a5 BF |
698 | return PTR_ERR(client); |
699 | } | |
c6bb3ca2 BF |
700 | cred = get_backchannel_cred(clp, client, ses); |
701 | if (IS_ERR(cred)) { | |
702 | rpc_shutdown_client(client); | |
703 | return PTR_ERR(cred); | |
704 | } | |
6ff8da08 | 705 | clp->cl_cb_client = client; |
c6bb3ca2 | 706 | clp->cl_cb_cred = cred; |
e1cab5a5 | 707 | return 0; |
a601caed BF |
708 | } |
709 | ||
ecdd03b7 BF |
710 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
711 | { | |
712 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
713 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
714 | } | |
715 | ||
77a3569d BF |
716 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
717 | { | |
718 | clp->cl_cb_state = NFSD4_CB_DOWN; | |
719 | warn_no_callback_path(clp, reason); | |
720 | } | |
721 | ||
5423732a BH |
722 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
723 | { | |
724 | clp->cl_cb_state = NFSD4_CB_FAULT; | |
725 | warn_no_callback_path(clp, reason); | |
726 | } | |
727 | ||
e300a63c BF |
728 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
729 | { | |
cee277d9 | 730 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
731 | |
732 | if (task->tk_status) | |
77a3569d | 733 | nfsd4_mark_cb_down(clp, task->tk_status); |
e300a63c | 734 | else |
77a3569d | 735 | clp->cl_cb_state = NFSD4_CB_UP; |
e300a63c BF |
736 | } |
737 | ||
738 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
739 | /* XXX: release method to ensure we set the cb channel down if |
740 | * necessary on early failure? */ | |
e300a63c BF |
741 | .rpc_call_done = nfsd4_cb_probe_done, |
742 | }; | |
743 | ||
cee277d9 | 744 | static struct workqueue_struct *callback_wq; |
80fc015b | 745 | |
229b2a08 BF |
746 | static void run_nfsd4_cb(struct nfsd4_callback *cb) |
747 | { | |
748 | queue_work(callback_wq, &cb->cb_work); | |
749 | } | |
750 | ||
5a3c9d71 | 751 | static void do_probe_callback(struct nfs4_client *clp) |
a601caed | 752 | { |
cee277d9 | 753 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
a601caed | 754 | |
fb003923 BF |
755 | cb->cb_op = NULL; |
756 | cb->cb_clp = clp; | |
cee277d9 BF |
757 | |
758 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; | |
759 | cb->cb_msg.rpc_argp = NULL; | |
760 | cb->cb_msg.rpc_resp = NULL; | |
cee277d9 BF |
761 | |
762 | cb->cb_ops = &nfsd4_cb_probe_ops; | |
763 | ||
229b2a08 | 764 | run_nfsd4_cb(cb); |
63c86716 BF |
765 | } |
766 | ||
767 | /* | |
5a3c9d71 BF |
768 | * Poke the callback thread to process any updates to the callback |
769 | * parameters, and send a null probe. | |
63c86716 | 770 | */ |
5a3c9d71 BF |
771 | void nfsd4_probe_callback(struct nfs4_client *clp) |
772 | { | |
77a3569d | 773 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
a52d726b | 774 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
5a3c9d71 BF |
775 | do_probe_callback(clp); |
776 | } | |
777 | ||
84f5f7cc | 778 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 779 | { |
84f5f7cc BF |
780 | nfsd4_probe_callback(clp); |
781 | flush_workqueue(callback_wq); | |
782 | } | |
63c86716 | 783 | |
5a3c9d71 | 784 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 785 | { |
77a3569d | 786 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
6ff8da08 BF |
787 | spin_lock(&clp->cl_lock); |
788 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 789 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
790 | } |
791 | ||
2a1d1b59 RL |
792 | /* |
793 | * There's currently a single callback channel slot. | |
794 | * If the slot is available, then mark it busy. Otherwise, set the | |
795 | * thread for sleeping on the callback RPC wait queue. | |
796 | */ | |
3ff3600e | 797 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
2a1d1b59 | 798 | { |
2a1d1b59 RL |
799 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
800 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
801 | dprintk("%s slot is busy\n", __func__); | |
3ff3600e | 802 | return false; |
2a1d1b59 | 803 | } |
3ff3600e | 804 | return true; |
2a1d1b59 RL |
805 | } |
806 | ||
807 | /* | |
808 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
809 | * slots, and mark callback channel down on communication errors. | |
810 | */ | |
811 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
812 | { | |
5878453d | 813 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 814 | struct nfs4_client *clp = cb->cb_clp; |
8323c3b2 | 815 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 816 | |
fb003923 | 817 | cb->cb_minorversion = minorversion; |
2a1d1b59 | 818 | if (minorversion) { |
3ff3600e | 819 | if (!nfsd41_cb_get_slot(clp, task)) |
2a1d1b59 | 820 | return; |
2a1d1b59 | 821 | } |
5ce8ba25 | 822 | spin_lock(&clp->cl_lock); |
a8f2800b BF |
823 | if (list_empty(&cb->cb_per_client)) { |
824 | /* This is the first call, not a restart */ | |
825 | cb->cb_done = false; | |
826 | list_add(&cb->cb_per_client, &clp->cl_callbacks); | |
827 | } | |
5ce8ba25 | 828 | spin_unlock(&clp->cl_lock); |
2a1d1b59 RL |
829 | rpc_call_start(task); |
830 | } | |
831 | ||
0421b5c5 RL |
832 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
833 | { | |
5878453d | 834 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 835 | struct nfs4_client *clp = cb->cb_clp; |
0421b5c5 RL |
836 | |
837 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 838 | clp->cl_minorversion); |
0421b5c5 | 839 | |
8323c3b2 | 840 | if (clp->cl_minorversion) { |
0421b5c5 | 841 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 842 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
843 | clear_bit(0, &clp->cl_cb_slot_busy); |
844 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
845 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 846 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 RL |
847 | |
848 | /* We're done looking into the sequence information */ | |
849 | task->tk_msg.rpc_resp = NULL; | |
850 | } | |
851 | } | |
852 | ||
4b21d0de | 853 | |
63e4863f BF |
854 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
855 | { | |
5878453d BF |
856 | struct nfsd4_callback *cb = calldata; |
857 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
8be2d234 | 858 | struct nfs4_client *clp = cb->cb_clp; |
4b21d0de | 859 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 860 | |
0421b5c5 RL |
861 | nfsd4_cb_done(task, calldata); |
862 | ||
a8f2800b BF |
863 | if (current_rpc_client != task->tk_client) { |
864 | /* We're shutting down or changing cl_cb_client; leave | |
865 | * it to nfsd4_process_cb_update to restart the call if | |
866 | * necessary. */ | |
4b21d0de BF |
867 | return; |
868 | } | |
869 | ||
5ce8ba25 BF |
870 | if (cb->cb_done) |
871 | return; | |
63e4863f | 872 | switch (task->tk_status) { |
172c85dd | 873 | case 0: |
5ce8ba25 | 874 | cb->cb_done = true; |
172c85dd BF |
875 | return; |
876 | case -EBADHANDLE: | |
877 | case -NFS4ERR_BAD_STATEID: | |
878 | /* Race: client probably got cb_recall | |
879 | * before open reply granting delegation */ | |
880 | break; | |
881 | default: | |
63e4863f | 882 | /* Network partition? */ |
77a3569d | 883 | nfsd4_mark_cb_down(clp, task->tk_status); |
63e4863f BF |
884 | } |
885 | if (dp->dl_retries--) { | |
886 | rpc_delay(task, 2*HZ); | |
887 | task->tk_status = 0; | |
c18c821f | 888 | rpc_restart_call_prepare(task); |
0421b5c5 | 889 | return; |
63e4863f | 890 | } |
5ce8ba25 BF |
891 | nfsd4_mark_cb_down(clp, task->tk_status); |
892 | cb->cb_done = true; | |
63e4863f BF |
893 | } |
894 | ||
895 | static void nfsd4_cb_recall_release(void *calldata) | |
896 | { | |
5878453d | 897 | struct nfsd4_callback *cb = calldata; |
5ce8ba25 | 898 | struct nfs4_client *clp = cb->cb_clp; |
5878453d | 899 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
63e4863f | 900 | |
5ce8ba25 BF |
901 | if (cb->cb_done) { |
902 | spin_lock(&clp->cl_lock); | |
903 | list_del(&cb->cb_per_client); | |
904 | spin_unlock(&clp->cl_lock); | |
905 | nfs4_put_delegation(dp); | |
906 | } | |
63e4863f BF |
907 | } |
908 | ||
909 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 910 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
911 | .rpc_call_done = nfsd4_cb_recall_done, |
912 | .rpc_release = nfsd4_cb_recall_release, | |
913 | }; | |
914 | ||
b5a1a81e BF |
915 | int nfsd4_create_callback_queue(void) |
916 | { | |
917 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
918 | if (!callback_wq) | |
919 | return -ENOMEM; | |
920 | return 0; | |
921 | } | |
922 | ||
923 | void nfsd4_destroy_callback_queue(void) | |
924 | { | |
925 | destroy_workqueue(callback_wq); | |
926 | } | |
927 | ||
ab707e15 | 928 | /* must be called under the state lock */ |
6ff8da08 | 929 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 930 | { |
a52d726b | 931 | set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
b5a1a81e | 932 | /* |
6ff8da08 BF |
933 | * Note this won't actually result in a null callback; |
934 | * instead, nfsd4_do_callback_rpc() will detect the killed | |
935 | * client, destroy the rpc client, and stop: | |
b5a1a81e | 936 | */ |
6ff8da08 | 937 | do_probe_callback(clp); |
b5a1a81e | 938 | flush_workqueue(callback_wq); |
b5a1a81e BF |
939 | } |
940 | ||
65e4c894 | 941 | static void nfsd4_release_cb(struct nfsd4_callback *cb) |
1da177e4 | 942 | { |
5878453d BF |
943 | if (cb->cb_ops->rpc_release) |
944 | cb->cb_ops->rpc_release(cb); | |
945 | } | |
946 | ||
dcbeaa68 BF |
947 | /* requires cl_lock: */ |
948 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) | |
949 | { | |
950 | struct nfsd4_session *s; | |
951 | struct nfsd4_conn *c; | |
952 | ||
953 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { | |
954 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
955 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
956 | return c; | |
957 | } | |
958 | } | |
959 | return NULL; | |
960 | } | |
961 | ||
65e4c894 | 962 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
963 | { |
964 | struct nfs4_cb_conn conn; | |
965 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
966 | struct nfsd4_session *ses = NULL; |
967 | struct nfsd4_conn *c; | |
6ff8da08 BF |
968 | int err; |
969 | ||
970 | /* | |
971 | * This is either an update, or the client dying; in either case, | |
972 | * kill the old client: | |
973 | */ | |
974 | if (clp->cl_cb_client) { | |
975 | rpc_shutdown_client(clp->cl_cb_client); | |
976 | clp->cl_cb_client = NULL; | |
c6bb3ca2 BF |
977 | put_rpccred(clp->cl_cb_cred); |
978 | clp->cl_cb_cred = NULL; | |
6ff8da08 | 979 | } |
dcbeaa68 BF |
980 | if (clp->cl_cb_conn.cb_xprt) { |
981 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
982 | clp->cl_cb_conn.cb_xprt = NULL; | |
983 | } | |
a52d726b | 984 | if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) |
6ff8da08 BF |
985 | return; |
986 | spin_lock(&clp->cl_lock); | |
987 | /* | |
988 | * Only serialized callback code is allowed to clear these | |
989 | * flags; main nfsd code can only set them: | |
990 | */ | |
a52d726b JL |
991 | BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); |
992 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); | |
6ff8da08 | 993 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
dcbeaa68 BF |
994 | c = __nfsd4_find_backchannel(clp); |
995 | if (c) { | |
996 | svc_xprt_get(c->cn_xprt); | |
997 | conn.cb_xprt = c->cn_xprt; | |
998 | ses = c->cn_session; | |
999 | } | |
6ff8da08 BF |
1000 | spin_unlock(&clp->cl_lock); |
1001 | ||
dcbeaa68 | 1002 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 1003 | if (err) { |
8546ee51 | 1004 | nfsd4_mark_cb_down(clp, err); |
5ce8ba25 BF |
1005 | return; |
1006 | } | |
1007 | /* Yay, the callback channel's back! Restart any callbacks: */ | |
1008 | list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) | |
1009 | run_nfsd4_cb(cb); | |
6ff8da08 BF |
1010 | } |
1011 | ||
57725155 | 1012 | static void nfsd4_do_callback_rpc(struct work_struct *w) |
5878453d BF |
1013 | { |
1014 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); | |
fb003923 | 1015 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 1016 | struct rpc_clnt *clnt; |
1da177e4 | 1017 | |
a52d726b | 1018 | if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) |
6ff8da08 BF |
1019 | nfsd4_process_cb_update(cb); |
1020 | ||
1021 | clnt = clp->cl_cb_client; | |
1022 | if (!clnt) { | |
1023 | /* Callback channel broken, or client killed; give up: */ | |
5878453d | 1024 | nfsd4_release_cb(cb); |
6ff8da08 | 1025 | return; |
ac94bf58 | 1026 | } |
c6bb3ca2 | 1027 | cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
cee277d9 BF |
1028 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
1029 | cb->cb_ops, cb); | |
1da177e4 | 1030 | } |
b5a1a81e | 1031 | |
57725155 BF |
1032 | void nfsd4_init_callback(struct nfsd4_callback *cb) |
1033 | { | |
1034 | INIT_WORK(&cb->cb_work, nfsd4_do_callback_rpc); | |
1035 | } | |
1036 | ||
5878453d | 1037 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
b5a1a81e | 1038 | { |
5878453d | 1039 | struct nfsd4_callback *cb = &dp->dl_recall; |
2a74aba7 | 1040 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
b5a1a81e | 1041 | |
5878453d | 1042 | dp->dl_retries = 1; |
fb003923 | 1043 | cb->cb_op = dp; |
5ce8ba25 | 1044 | cb->cb_clp = clp; |
5878453d | 1045 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
fb003923 BF |
1046 | cb->cb_msg.rpc_argp = cb; |
1047 | cb->cb_msg.rpc_resp = cb; | |
5878453d BF |
1048 | |
1049 | cb->cb_ops = &nfsd4_cb_recall_ops; | |
b5a1a81e | 1050 | |
9ee1ba54 | 1051 | INIT_LIST_HEAD(&cb->cb_per_client); |
5ce8ba25 BF |
1052 | cb->cb_done = true; |
1053 | ||
229b2a08 | 1054 | run_nfsd4_cb(&dp->dl_recall); |
b5a1a81e | 1055 | } |