Commit | Line | Data |
---|---|---|
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> |
b5a1a81e | 35 | #include <linux/sunrpc/svc_xprt.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
9a74af21 BH |
37 | #include "nfsd.h" |
38 | #include "state.h" | |
1da177e4 LT |
39 | |
40 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
41 | ||
5423732a BH |
42 | static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
43 | ||
1da177e4 LT |
44 | #define NFSPROC4_CB_NULL 0 |
45 | #define NFSPROC4_CB_COMPOUND 1 | |
46 | ||
1da177e4 LT |
47 | /* Index of predefined Linux callback client operations */ |
48 | ||
49 | enum { | |
4be36ca0 | 50 | NFSPROC4_CLNT_CB_NULL = 0, |
1da177e4 | 51 | NFSPROC4_CLNT_CB_RECALL, |
38524ab3 | 52 | NFSPROC4_CLNT_CB_SEQUENCE, |
1da177e4 LT |
53 | }; |
54 | ||
1da177e4 LT |
55 | #define NFS4_MAXTAGLEN 20 |
56 | ||
57 | #define NFS4_enc_cb_null_sz 0 | |
58 | #define NFS4_dec_cb_null_sz 0 | |
59 | #define cb_compound_enc_hdr_sz 4 | |
60 | #define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) | |
38524ab3 AA |
61 | #define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) |
62 | #define cb_sequence_enc_sz (sessionid_sz + 4 + \ | |
63 | 1 /* no referring calls list yet */) | |
64 | #define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) | |
65 | ||
1da177e4 LT |
66 | #define op_enc_sz 1 |
67 | #define op_dec_sz 2 | |
68 | #define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) | |
0ac68d17 | 69 | #define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) |
1da177e4 | 70 | #define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ |
38524ab3 | 71 | cb_sequence_enc_sz + \ |
1da177e4 LT |
72 | 1 + enc_stateid_sz + \ |
73 | enc_nfs4_fh_sz) | |
74 | ||
75 | #define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ | |
38524ab3 | 76 | cb_sequence_dec_sz + \ |
1da177e4 LT |
77 | op_dec_sz) |
78 | ||
1da177e4 | 79 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
80 | /* args */ |
81 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 82 | u32 nops; |
ef52bff8 | 83 | __be32 *nops_p; |
ab52ae6d | 84 | u32 minorversion; |
38524ab3 AA |
85 | /* res */ |
86 | int status; | |
1da177e4 LT |
87 | }; |
88 | ||
85a56480 CL |
89 | /* |
90 | * Handle decode buffer overflows out-of-line. | |
91 | */ | |
92 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) | |
1da177e4 | 93 | { |
85a56480 CL |
94 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
95 | "Remaining buffer length is %tu words.\n", | |
96 | func, xdr->end - xdr->p); | |
1da177e4 LT |
97 | } |
98 | ||
a033db48 CL |
99 | static __be32 *xdr_encode_empty_array(__be32 *p) |
100 | { | |
101 | *p++ = xdr_zero; | |
102 | return p; | |
103 | } | |
104 | ||
105 | /* | |
106 | * Encode/decode NFSv4 CB basic data types | |
107 | * | |
108 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
109 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
110 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
111 | * 1 Protocol" | |
112 | */ | |
113 | ||
114 | /* | |
115 | * nfs_cb_opnum4 | |
116 | * | |
117 | * enum nfs_cb_opnum4 { | |
118 | * OP_CB_GETATTR = 3, | |
119 | * ... | |
120 | * }; | |
121 | */ | |
122 | enum nfs_cb_opnum4 { | |
123 | OP_CB_GETATTR = 3, | |
124 | OP_CB_RECALL = 4, | |
125 | OP_CB_LAYOUTRECALL = 5, | |
126 | OP_CB_NOTIFY = 6, | |
127 | OP_CB_PUSH_DELEG = 7, | |
128 | OP_CB_RECALL_ANY = 8, | |
129 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
130 | OP_CB_RECALL_SLOT = 10, | |
131 | OP_CB_SEQUENCE = 11, | |
132 | OP_CB_WANTS_CANCELLED = 12, | |
133 | OP_CB_NOTIFY_LOCK = 13, | |
134 | OP_CB_NOTIFY_DEVICEID = 14, | |
135 | OP_CB_ILLEGAL = 10044 | |
136 | }; | |
137 | ||
138 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
139 | { | |
140 | __be32 *p; | |
141 | ||
142 | p = xdr_reserve_space(xdr, 4); | |
143 | *p = cpu_to_be32(op); | |
144 | } | |
145 | ||
146 | /* | |
147 | * nfs_fh4 | |
148 | * | |
149 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
150 | */ | |
151 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
152 | { | |
153 | u32 length = fh->fh_size; | |
154 | __be32 *p; | |
155 | ||
156 | BUG_ON(length > NFS4_FHSIZE); | |
157 | p = xdr_reserve_space(xdr, 4 + length); | |
158 | xdr_encode_opaque(p, &fh->fh_base, length); | |
159 | } | |
160 | ||
1da177e4 | 161 | /* |
a033db48 CL |
162 | * stateid4 |
163 | * | |
164 | * struct stateid4 { | |
165 | * uint32_t seqid; | |
166 | * opaque other[12]; | |
167 | * }; | |
1da177e4 | 168 | */ |
a033db48 CL |
169 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
170 | { | |
171 | __be32 *p; | |
1da177e4 | 172 | |
a033db48 CL |
173 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
174 | *p++ = cpu_to_be32(sid->si_generation); | |
175 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
176 | } | |
177 | ||
178 | /* | |
179 | * sessionid4 | |
180 | * | |
181 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
182 | */ | |
183 | static void encode_sessionid4(struct xdr_stream *xdr, | |
184 | const struct nfsd4_session *session) | |
9303bbd3 BH |
185 | { |
186 | __be32 *p; | |
187 | ||
a033db48 CL |
188 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
189 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
190 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
191 | } |
192 | ||
85a56480 CL |
193 | /* |
194 | * nfsstat4 | |
195 | */ | |
196 | static const struct { | |
197 | int stat; | |
198 | int errno; | |
199 | } nfs_cb_errtbl[] = { | |
200 | { NFS4_OK, 0 }, | |
201 | { NFS4ERR_PERM, -EPERM }, | |
202 | { NFS4ERR_NOENT, -ENOENT }, | |
203 | { NFS4ERR_IO, -EIO }, | |
204 | { NFS4ERR_NXIO, -ENXIO }, | |
205 | { NFS4ERR_ACCESS, -EACCES }, | |
206 | { NFS4ERR_EXIST, -EEXIST }, | |
207 | { NFS4ERR_XDEV, -EXDEV }, | |
208 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
209 | { NFS4ERR_ISDIR, -EISDIR }, | |
210 | { NFS4ERR_INVAL, -EINVAL }, | |
211 | { NFS4ERR_FBIG, -EFBIG }, | |
212 | { NFS4ERR_NOSPC, -ENOSPC }, | |
213 | { NFS4ERR_ROFS, -EROFS }, | |
214 | { NFS4ERR_MLINK, -EMLINK }, | |
215 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
216 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
217 | { NFS4ERR_DQUOT, -EDQUOT }, | |
218 | { NFS4ERR_STALE, -ESTALE }, | |
219 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
220 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
221 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
222 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
223 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
224 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
225 | { NFS4ERR_LOCKED, -EAGAIN }, | |
226 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
227 | { NFS4ERR_SYMLINK, -ELOOP }, | |
228 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
229 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
230 | { -1, -EIO } | |
231 | }; | |
232 | ||
233 | /* | |
234 | * If we cannot translate the error, the recovery routines should | |
235 | * handle it. | |
236 | * | |
237 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
238 | * not conflict with native Linux error codes. | |
239 | */ | |
240 | static int nfs_cb_stat_to_errno(int status) | |
241 | { | |
242 | int i; | |
243 | ||
244 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
245 | if (nfs_cb_errtbl[i].stat == status) | |
246 | return nfs_cb_errtbl[i].errno; | |
247 | } | |
248 | ||
249 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
250 | return -status; | |
251 | } | |
252 | ||
253 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, | |
254 | enum nfsstat4 *status) | |
255 | { | |
256 | __be32 *p; | |
257 | u32 op; | |
258 | ||
259 | p = xdr_inline_decode(xdr, 4 + 4); | |
260 | if (unlikely(p == NULL)) | |
261 | goto out_overflow; | |
262 | op = be32_to_cpup(p++); | |
263 | if (unlikely(op != expected)) | |
264 | goto out_unexpected; | |
265 | *status = be32_to_cpup(p); | |
266 | return 0; | |
267 | out_overflow: | |
268 | print_overflow_msg(__func__, xdr); | |
269 | return -EIO; | |
270 | out_unexpected: | |
271 | dprintk("NFSD: Callback server returned operation %d but " | |
272 | "we issued a request for %d\n", op, expected); | |
273 | return -EIO; | |
274 | } | |
275 | ||
a033db48 CL |
276 | /* |
277 | * CB_COMPOUND4args | |
278 | * | |
279 | * struct CB_COMPOUND4args { | |
280 | * utf8str_cs tag; | |
281 | * uint32_t minorversion; | |
282 | * uint32_t callback_ident; | |
283 | * nfs_cb_argop4 argarray<>; | |
284 | * }; | |
285 | */ | |
286 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
287 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 288 | { |
f00f328f | 289 | __be32 * p; |
1da177e4 | 290 | |
a033db48 CL |
291 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
292 | p = xdr_encode_empty_array(p); /* empty tag */ | |
293 | *p++ = cpu_to_be32(hdr->minorversion); | |
294 | *p++ = cpu_to_be32(hdr->ident); | |
295 | ||
ef52bff8 | 296 | hdr->nops_p = p; |
a033db48 | 297 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
298 | } |
299 | ||
a033db48 CL |
300 | /* |
301 | * Update argarray element count | |
302 | */ | |
ef52bff8 AA |
303 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
304 | { | |
a033db48 CL |
305 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
306 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
307 | } |
308 | ||
85a56480 CL |
309 | /* |
310 | * CB_COMPOUND4res | |
311 | * | |
312 | * struct CB_COMPOUND4res { | |
313 | * nfsstat4 status; | |
314 | * utf8str_cs tag; | |
315 | * nfs_cb_resop4 resarray<>; | |
316 | * }; | |
317 | */ | |
318 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
319 | struct nfs4_cb_compound_hdr *hdr) | |
320 | { | |
321 | u32 length; | |
322 | __be32 *p; | |
323 | ||
324 | p = xdr_inline_decode(xdr, 4 + 4); | |
325 | if (unlikely(p == NULL)) | |
326 | goto out_overflow; | |
327 | hdr->status = be32_to_cpup(p++); | |
328 | /* Ignore the tag */ | |
329 | length = be32_to_cpup(p++); | |
330 | p = xdr_inline_decode(xdr, length + 4); | |
331 | if (unlikely(p == NULL)) | |
332 | goto out_overflow; | |
333 | hdr->nops = be32_to_cpup(p); | |
334 | return 0; | |
335 | out_overflow: | |
336 | print_overflow_msg(__func__, xdr); | |
337 | return -EIO; | |
338 | } | |
339 | ||
a033db48 CL |
340 | /* |
341 | * CB_RECALL4args | |
342 | * | |
343 | * struct CB_RECALL4args { | |
344 | * stateid4 stateid; | |
345 | * bool truncate; | |
346 | * nfs_fh4 fh; | |
347 | * }; | |
348 | */ | |
349 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
350 | const struct nfs4_delegation *dp, | |
351 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 352 | { |
f00f328f | 353 | __be32 *p; |
a033db48 CL |
354 | |
355 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 356 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
357 | |
358 | p = xdr_reserve_space(xdr, 4); | |
359 | *p++ = xdr_zero; /* truncate */ | |
360 | ||
361 | encode_nfs_fh4(xdr, &dp->dl_fh); | |
362 | ||
ef52bff8 | 363 | hdr->nops++; |
1da177e4 LT |
364 | } |
365 | ||
a033db48 CL |
366 | /* |
367 | * CB_SEQUENCE4args | |
368 | * | |
369 | * struct CB_SEQUENCE4args { | |
370 | * sessionid4 csa_sessionid; | |
371 | * sequenceid4 csa_sequenceid; | |
372 | * slotid4 csa_slotid; | |
373 | * slotid4 csa_highest_slotid; | |
374 | * bool csa_cachethis; | |
375 | * referring_call_list4 csa_referring_call_lists<>; | |
376 | * }; | |
377 | */ | |
378 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
379 | const struct nfsd4_callback *cb, | |
380 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 381 | { |
a033db48 | 382 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
383 | __be32 *p; |
384 | ||
385 | if (hdr->minorversion == 0) | |
386 | return; | |
387 | ||
a033db48 CL |
388 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
389 | encode_sessionid4(xdr, session); | |
390 | ||
391 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
392 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
393 | *p++ = xdr_zero; /* csa_slotid */ | |
394 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
395 | *p++ = xdr_zero; /* csa_cachethis */ | |
396 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 397 | |
2af73580 BH |
398 | hdr->nops++; |
399 | } | |
400 | ||
85a56480 CL |
401 | /* |
402 | * CB_SEQUENCE4resok | |
403 | * | |
404 | * struct CB_SEQUENCE4resok { | |
405 | * sessionid4 csr_sessionid; | |
406 | * sequenceid4 csr_sequenceid; | |
407 | * slotid4 csr_slotid; | |
408 | * slotid4 csr_highest_slotid; | |
409 | * slotid4 csr_target_highest_slotid; | |
410 | * }; | |
411 | * | |
412 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
413 | * case NFS4_OK: | |
414 | * CB_SEQUENCE4resok csr_resok4; | |
415 | * default: | |
416 | * void; | |
417 | * }; | |
418 | * | |
419 | * Our current back channel implmentation supports a single backchannel | |
420 | * with a single slot. | |
421 | */ | |
422 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
423 | struct nfsd4_callback *cb) | |
424 | { | |
425 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
426 | struct nfs4_sessionid id; | |
427 | int status; | |
428 | __be32 *p; | |
429 | u32 dummy; | |
430 | ||
431 | status = -ESERVERFAULT; | |
432 | ||
433 | /* | |
434 | * If the server returns different values for sessionID, slotID or | |
435 | * sequence number, the server is looney tunes. | |
436 | */ | |
2c9c8f36 | 437 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
438 | if (unlikely(p == NULL)) |
439 | goto out_overflow; | |
440 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
441 | if (memcmp(id.data, session->se_sessionid.data, | |
442 | NFS4_MAX_SESSIONID_LEN) != 0) { | |
443 | dprintk("NFS: %s Invalid session id\n", __func__); | |
444 | goto out; | |
445 | } | |
446 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
447 | ||
448 | dummy = be32_to_cpup(p++); | |
449 | if (dummy != session->se_cb_seq_nr) { | |
450 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
451 | goto out; | |
452 | } | |
453 | ||
454 | dummy = be32_to_cpup(p++); | |
455 | if (dummy != 0) { | |
456 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
457 | goto out; | |
458 | } | |
459 | ||
460 | /* | |
461 | * FIXME: process highest slotid and target highest slotid | |
462 | */ | |
463 | status = 0; | |
464 | out: | |
5423732a BH |
465 | if (status) |
466 | nfsd4_mark_cb_fault(cb->cb_clp, status); | |
85a56480 CL |
467 | return status; |
468 | out_overflow: | |
469 | print_overflow_msg(__func__, xdr); | |
470 | return -EIO; | |
471 | } | |
472 | ||
473 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
474 | struct nfsd4_callback *cb) | |
475 | { | |
476 | enum nfsstat4 nfserr; | |
477 | int status; | |
478 | ||
479 | if (cb->cb_minorversion == 0) | |
480 | return 0; | |
481 | ||
482 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); | |
483 | if (unlikely(status)) | |
484 | goto out; | |
485 | if (unlikely(nfserr != NFS4_OK)) | |
486 | goto out_default; | |
487 | status = decode_cb_sequence4resok(xdr, cb); | |
488 | out: | |
489 | return status; | |
490 | out_default: | |
0af3f814 | 491 | return nfs_cb_stat_to_errno(nfserr); |
85a56480 CL |
492 | } |
493 | ||
a033db48 CL |
494 | /* |
495 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
496 | * | |
497 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
498 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
499 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
500 | * Protocol". | |
501 | */ | |
502 | ||
503 | /* | |
504 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
505 | */ | |
9f06c719 CL |
506 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
507 | void *__unused) | |
1da177e4 | 508 | { |
a033db48 | 509 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
510 | } |
511 | ||
a033db48 CL |
512 | /* |
513 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
514 | */ | |
9f06c719 CL |
515 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
516 | const struct nfsd4_callback *cb) | |
1da177e4 | 517 | { |
a033db48 | 518 | const struct nfs4_delegation *args = cb->cb_op; |
1da177e4 | 519 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 520 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 521 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
522 | }; |
523 | ||
9f06c719 CL |
524 | encode_cb_compound4args(xdr, &hdr); |
525 | encode_cb_sequence4args(xdr, cb, &hdr); | |
526 | encode_cb_recall4args(xdr, args, &hdr); | |
ef52bff8 | 527 | encode_cb_nops(&hdr); |
1da177e4 LT |
528 | } |
529 | ||
530 | ||
2af73580 | 531 | /* |
85a56480 CL |
532 | * NFSv4.0 and NFSv4.1 XDR decode functions |
533 | * | |
534 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
535 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
536 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
537 | * Protocol". | |
2af73580 | 538 | */ |
2af73580 | 539 | |
bf269551 CL |
540 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
541 | void *__unused) | |
1da177e4 LT |
542 | { |
543 | return 0; | |
544 | } | |
545 | ||
85a56480 CL |
546 | /* |
547 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
548 | */ | |
bf269551 CL |
549 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
550 | struct xdr_stream *xdr, | |
85a56480 | 551 | struct nfsd4_callback *cb) |
1da177e4 | 552 | { |
1da177e4 | 553 | struct nfs4_cb_compound_hdr hdr; |
85a56480 | 554 | enum nfsstat4 nfserr; |
1da177e4 LT |
555 | int status; |
556 | ||
bf269551 | 557 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 558 | if (unlikely(status)) |
1da177e4 | 559 | goto out; |
85a56480 CL |
560 | |
561 | if (cb != NULL) { | |
bf269551 | 562 | status = decode_cb_sequence4res(xdr, cb); |
85a56480 | 563 | if (unlikely(status)) |
0421b5c5 RL |
564 | goto out; |
565 | } | |
85a56480 | 566 | |
bf269551 | 567 | status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); |
85a56480 CL |
568 | if (unlikely(status)) |
569 | goto out; | |
570 | if (unlikely(nfserr != NFS4_OK)) | |
0af3f814 | 571 | status = nfs_cb_stat_to_errno(nfserr); |
1da177e4 LT |
572 | out: |
573 | return status; | |
574 | } | |
575 | ||
576 | /* | |
577 | * RPC procedure tables | |
578 | */ | |
7d93bd71 CL |
579 | #define PROC(proc, call, argtype, restype) \ |
580 | [NFSPROC4_CLNT_##proc] = { \ | |
581 | .p_proc = NFSPROC4_CB_##call, \ | |
9f06c719 | 582 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
bf269551 | 583 | .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
584 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
585 | .p_replen = NFS4_dec_##restype##_sz, \ | |
586 | .p_statidx = NFSPROC4_CB_##call, \ | |
587 | .p_name = #proc, \ | |
1da177e4 LT |
588 | } |
589 | ||
7d93bd71 CL |
590 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
591 | PROC(CB_NULL, NULL, cb_null, cb_null), | |
592 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
1da177e4 LT |
593 | }; |
594 | ||
7d93bd71 | 595 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
596 | /* |
597 | * Note on the callback rpc program version number: despite language in rfc | |
598 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
599 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
600 | * in practice that appears to be what implementations use. The section | |
601 | * 18.36.3 language is expected to be fixed in an erratum. | |
602 | */ | |
7d93bd71 CL |
603 | .number = 1, |
604 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
605 | .procs = nfs4_cb_procedures | |
1da177e4 LT |
606 | }; |
607 | ||
7d93bd71 | 608 | static struct rpc_version *nfs_cb_version[] = { |
1da177e4 LT |
609 | &nfs_cb_version4, |
610 | }; | |
611 | ||
ff7d9756 OK |
612 | static struct rpc_program cb_program; |
613 | ||
614 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 615 | .program = &cb_program |
ff7d9756 OK |
616 | }; |
617 | ||
618 | #define NFS4_CALLBACK 0x40000000 | |
619 | static struct rpc_program cb_program = { | |
7d93bd71 CL |
620 | .name = "nfs4_cb", |
621 | .number = NFS4_CALLBACK, | |
622 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
623 | .version = nfs_cb_version, | |
624 | .stats = &cb_stats, | |
625 | .pipe_dir_name = "/nfsd4_cb", | |
ff7d9756 OK |
626 | }; |
627 | ||
595947ac BF |
628 | static int max_cb_time(void) |
629 | { | |
cf07d2ea | 630 | return max(nfsd4_lease/10, (time_t)1) * HZ; |
595947ac BF |
631 | } |
632 | ||
2b47eece | 633 | |
dcbeaa68 | 634 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 635 | { |
ae5c7947 | 636 | struct rpc_timeout timeparms = { |
595947ac BF |
637 | .to_initval = max_cb_time(), |
638 | .to_retries = 0, | |
ae5c7947 | 639 | }; |
ae5c7947 | 640 | struct rpc_create_args args = { |
c653ce3f | 641 | .net = &init_net, |
07263f1e BF |
642 | .address = (struct sockaddr *) &conn->cb_addr, |
643 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 644 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 645 | .timeout = &timeparms, |
ff7d9756 | 646 | .program = &cb_program, |
b7299f44 | 647 | .version = 0, |
61054b14 | 648 | .authflavor = clp->cl_flavor, |
b6b6152c | 649 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 650 | }; |
63c86716 | 651 | struct rpc_clnt *client; |
1da177e4 | 652 | |
5d18c1c2 BF |
653 | if (clp->cl_minorversion == 0) { |
654 | if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) | |
655 | return -EINVAL; | |
656 | args.client_name = clp->cl_principal; | |
657 | args.prognumber = conn->cb_prog, | |
658 | args.protocol = XPRT_TRANSPORT_TCP; | |
659 | clp->cl_cb_ident = conn->cb_ident; | |
660 | } else { | |
dcbeaa68 BF |
661 | if (!conn->cb_xprt) |
662 | return -EINVAL; | |
663 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
664 | clp->cl_cb_session = ses; | |
07263f1e | 665 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 666 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3ddc8bf5 AB |
667 | args.protocol = XPRT_TRANSPORT_BC_TCP; |
668 | } | |
ae5c7947 | 669 | /* Create RPC client */ |
63c86716 | 670 | client = rpc_create(&args); |
e1cab5a5 | 671 | if (IS_ERR(client)) { |
a601caed BF |
672 | dprintk("NFSD: couldn't create callback client: %ld\n", |
673 | PTR_ERR(client)); | |
e1cab5a5 BF |
674 | return PTR_ERR(client); |
675 | } | |
6ff8da08 | 676 | clp->cl_cb_client = client; |
e1cab5a5 | 677 | return 0; |
a601caed BF |
678 | |
679 | } | |
680 | ||
ecdd03b7 BF |
681 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
682 | { | |
683 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
684 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
685 | } | |
686 | ||
77a3569d BF |
687 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
688 | { | |
689 | clp->cl_cb_state = NFSD4_CB_DOWN; | |
690 | warn_no_callback_path(clp, reason); | |
691 | } | |
692 | ||
5423732a BH |
693 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
694 | { | |
695 | clp->cl_cb_state = NFSD4_CB_FAULT; | |
696 | warn_no_callback_path(clp, reason); | |
697 | } | |
698 | ||
e300a63c BF |
699 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
700 | { | |
cee277d9 | 701 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
702 | |
703 | if (task->tk_status) | |
77a3569d | 704 | nfsd4_mark_cb_down(clp, task->tk_status); |
e300a63c | 705 | else |
77a3569d | 706 | clp->cl_cb_state = NFSD4_CB_UP; |
e300a63c BF |
707 | } |
708 | ||
709 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
710 | /* XXX: release method to ensure we set the cb channel down if |
711 | * necessary on early failure? */ | |
e300a63c BF |
712 | .rpc_call_done = nfsd4_cb_probe_done, |
713 | }; | |
714 | ||
80fc015b BF |
715 | static struct rpc_cred *callback_cred; |
716 | ||
717 | int set_callback_cred(void) | |
3cef9ab2 | 718 | { |
8d75da8a BF |
719 | if (callback_cred) |
720 | return 0; | |
80fc015b BF |
721 | callback_cred = rpc_lookup_machine_cred(); |
722 | if (!callback_cred) | |
723 | return -ENOMEM; | |
724 | return 0; | |
3cef9ab2 BF |
725 | } |
726 | ||
cee277d9 | 727 | static struct workqueue_struct *callback_wq; |
80fc015b | 728 | |
229b2a08 BF |
729 | static void run_nfsd4_cb(struct nfsd4_callback *cb) |
730 | { | |
731 | queue_work(callback_wq, &cb->cb_work); | |
732 | } | |
733 | ||
5a3c9d71 | 734 | static void do_probe_callback(struct nfs4_client *clp) |
a601caed | 735 | { |
cee277d9 | 736 | struct nfsd4_callback *cb = &clp->cl_cb_null; |
a601caed | 737 | |
fb003923 BF |
738 | cb->cb_op = NULL; |
739 | cb->cb_clp = clp; | |
cee277d9 BF |
740 | |
741 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; | |
742 | cb->cb_msg.rpc_argp = NULL; | |
743 | cb->cb_msg.rpc_resp = NULL; | |
744 | cb->cb_msg.rpc_cred = callback_cred; | |
745 | ||
746 | cb->cb_ops = &nfsd4_cb_probe_ops; | |
747 | ||
229b2a08 | 748 | run_nfsd4_cb(cb); |
63c86716 BF |
749 | } |
750 | ||
751 | /* | |
5a3c9d71 BF |
752 | * Poke the callback thread to process any updates to the callback |
753 | * parameters, and send a null probe. | |
63c86716 | 754 | */ |
5a3c9d71 BF |
755 | void nfsd4_probe_callback(struct nfs4_client *clp) |
756 | { | |
77a3569d BF |
757 | /* XXX: atomicity? Also, should we be using cl_cb_flags? */ |
758 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; | |
5a3c9d71 BF |
759 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); |
760 | do_probe_callback(clp); | |
761 | } | |
762 | ||
84f5f7cc | 763 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 764 | { |
84f5f7cc BF |
765 | nfsd4_probe_callback(clp); |
766 | flush_workqueue(callback_wq); | |
767 | } | |
63c86716 | 768 | |
5a3c9d71 | 769 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 770 | { |
77a3569d | 771 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
6ff8da08 BF |
772 | spin_lock(&clp->cl_lock); |
773 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 774 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
775 | } |
776 | ||
2a1d1b59 RL |
777 | /* |
778 | * There's currently a single callback channel slot. | |
779 | * If the slot is available, then mark it busy. Otherwise, set the | |
780 | * thread for sleeping on the callback RPC wait queue. | |
781 | */ | |
3ff3600e | 782 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
2a1d1b59 | 783 | { |
2a1d1b59 RL |
784 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
785 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
786 | dprintk("%s slot is busy\n", __func__); | |
3ff3600e | 787 | return false; |
2a1d1b59 | 788 | } |
3ff3600e | 789 | return true; |
2a1d1b59 RL |
790 | } |
791 | ||
792 | /* | |
793 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
794 | * slots, and mark callback channel down on communication errors. | |
795 | */ | |
796 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
797 | { | |
5878453d BF |
798 | struct nfsd4_callback *cb = calldata; |
799 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
2a74aba7 | 800 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
8323c3b2 | 801 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 802 | |
fb003923 | 803 | cb->cb_minorversion = minorversion; |
2a1d1b59 | 804 | if (minorversion) { |
3ff3600e | 805 | if (!nfsd41_cb_get_slot(clp, task)) |
2a1d1b59 | 806 | return; |
2a1d1b59 | 807 | } |
5ce8ba25 | 808 | spin_lock(&clp->cl_lock); |
a8f2800b BF |
809 | if (list_empty(&cb->cb_per_client)) { |
810 | /* This is the first call, not a restart */ | |
811 | cb->cb_done = false; | |
812 | list_add(&cb->cb_per_client, &clp->cl_callbacks); | |
813 | } | |
5ce8ba25 | 814 | spin_unlock(&clp->cl_lock); |
2a1d1b59 RL |
815 | rpc_call_start(task); |
816 | } | |
817 | ||
0421b5c5 RL |
818 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
819 | { | |
5878453d BF |
820 | struct nfsd4_callback *cb = calldata; |
821 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
2a74aba7 | 822 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
0421b5c5 RL |
823 | |
824 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 825 | clp->cl_minorversion); |
0421b5c5 | 826 | |
8323c3b2 | 827 | if (clp->cl_minorversion) { |
0421b5c5 | 828 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 829 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
830 | clear_bit(0, &clp->cl_cb_slot_busy); |
831 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
832 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 833 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 RL |
834 | |
835 | /* We're done looking into the sequence information */ | |
836 | task->tk_msg.rpc_resp = NULL; | |
837 | } | |
838 | } | |
839 | ||
4b21d0de | 840 | |
63e4863f BF |
841 | static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) |
842 | { | |
5878453d BF |
843 | struct nfsd4_callback *cb = calldata; |
844 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); | |
2a74aba7 | 845 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
4b21d0de | 846 | struct rpc_clnt *current_rpc_client = clp->cl_cb_client; |
63e4863f | 847 | |
0421b5c5 RL |
848 | nfsd4_cb_done(task, calldata); |
849 | ||
a8f2800b BF |
850 | if (current_rpc_client != task->tk_client) { |
851 | /* We're shutting down or changing cl_cb_client; leave | |
852 | * it to nfsd4_process_cb_update to restart the call if | |
853 | * necessary. */ | |
4b21d0de BF |
854 | return; |
855 | } | |
856 | ||
5ce8ba25 BF |
857 | if (cb->cb_done) |
858 | return; | |
63e4863f | 859 | switch (task->tk_status) { |
172c85dd | 860 | case 0: |
5ce8ba25 | 861 | cb->cb_done = true; |
172c85dd BF |
862 | return; |
863 | case -EBADHANDLE: | |
864 | case -NFS4ERR_BAD_STATEID: | |
865 | /* Race: client probably got cb_recall | |
866 | * before open reply granting delegation */ | |
867 | break; | |
868 | default: | |
63e4863f | 869 | /* Network partition? */ |
77a3569d | 870 | nfsd4_mark_cb_down(clp, task->tk_status); |
63e4863f BF |
871 | } |
872 | if (dp->dl_retries--) { | |
873 | rpc_delay(task, 2*HZ); | |
874 | task->tk_status = 0; | |
c18c821f | 875 | rpc_restart_call_prepare(task); |
0421b5c5 | 876 | return; |
63e4863f | 877 | } |
5ce8ba25 BF |
878 | nfsd4_mark_cb_down(clp, task->tk_status); |
879 | cb->cb_done = true; | |
63e4863f BF |
880 | } |
881 | ||
882 | static void nfsd4_cb_recall_release(void *calldata) | |
883 | { | |
5878453d | 884 | struct nfsd4_callback *cb = calldata; |
5ce8ba25 | 885 | struct nfs4_client *clp = cb->cb_clp; |
5878453d | 886 | struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); |
63e4863f | 887 | |
5ce8ba25 BF |
888 | if (cb->cb_done) { |
889 | spin_lock(&clp->cl_lock); | |
890 | list_del(&cb->cb_per_client); | |
891 | spin_unlock(&clp->cl_lock); | |
892 | nfs4_put_delegation(dp); | |
893 | } | |
63e4863f BF |
894 | } |
895 | ||
896 | static const struct rpc_call_ops nfsd4_cb_recall_ops = { | |
2a1d1b59 | 897 | .rpc_call_prepare = nfsd4_cb_prepare, |
63e4863f BF |
898 | .rpc_call_done = nfsd4_cb_recall_done, |
899 | .rpc_release = nfsd4_cb_recall_release, | |
900 | }; | |
901 | ||
b5a1a81e BF |
902 | int nfsd4_create_callback_queue(void) |
903 | { | |
904 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
905 | if (!callback_wq) | |
906 | return -ENOMEM; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | void nfsd4_destroy_callback_queue(void) | |
911 | { | |
912 | destroy_workqueue(callback_wq); | |
913 | } | |
914 | ||
ab707e15 | 915 | /* must be called under the state lock */ |
6ff8da08 | 916 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 917 | { |
6ff8da08 | 918 | set_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags); |
b5a1a81e | 919 | /* |
6ff8da08 BF |
920 | * Note this won't actually result in a null callback; |
921 | * instead, nfsd4_do_callback_rpc() will detect the killed | |
922 | * client, destroy the rpc client, and stop: | |
b5a1a81e | 923 | */ |
6ff8da08 | 924 | do_probe_callback(clp); |
b5a1a81e | 925 | flush_workqueue(callback_wq); |
b5a1a81e BF |
926 | } |
927 | ||
65e4c894 | 928 | static void nfsd4_release_cb(struct nfsd4_callback *cb) |
1da177e4 | 929 | { |
5878453d BF |
930 | if (cb->cb_ops->rpc_release) |
931 | cb->cb_ops->rpc_release(cb); | |
932 | } | |
933 | ||
dcbeaa68 BF |
934 | /* requires cl_lock: */ |
935 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) | |
936 | { | |
937 | struct nfsd4_session *s; | |
938 | struct nfsd4_conn *c; | |
939 | ||
940 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { | |
941 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
942 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
943 | return c; | |
944 | } | |
945 | } | |
946 | return NULL; | |
947 | } | |
948 | ||
65e4c894 | 949 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
950 | { |
951 | struct nfs4_cb_conn conn; | |
952 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
953 | struct nfsd4_session *ses = NULL; |
954 | struct nfsd4_conn *c; | |
6ff8da08 BF |
955 | int err; |
956 | ||
957 | /* | |
958 | * This is either an update, or the client dying; in either case, | |
959 | * kill the old client: | |
960 | */ | |
961 | if (clp->cl_cb_client) { | |
962 | rpc_shutdown_client(clp->cl_cb_client); | |
963 | clp->cl_cb_client = NULL; | |
964 | } | |
dcbeaa68 BF |
965 | if (clp->cl_cb_conn.cb_xprt) { |
966 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
967 | clp->cl_cb_conn.cb_xprt = NULL; | |
968 | } | |
6ff8da08 BF |
969 | if (test_bit(NFSD4_CLIENT_KILL, &clp->cl_cb_flags)) |
970 | return; | |
971 | spin_lock(&clp->cl_lock); | |
972 | /* | |
973 | * Only serialized callback code is allowed to clear these | |
974 | * flags; main nfsd code can only set them: | |
975 | */ | |
976 | BUG_ON(!clp->cl_cb_flags); | |
977 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_flags); | |
978 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); | |
dcbeaa68 BF |
979 | c = __nfsd4_find_backchannel(clp); |
980 | if (c) { | |
981 | svc_xprt_get(c->cn_xprt); | |
982 | conn.cb_xprt = c->cn_xprt; | |
983 | ses = c->cn_session; | |
984 | } | |
6ff8da08 BF |
985 | spin_unlock(&clp->cl_lock); |
986 | ||
dcbeaa68 | 987 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 988 | if (err) { |
6ff8da08 | 989 | warn_no_callback_path(clp, err); |
5ce8ba25 BF |
990 | return; |
991 | } | |
992 | /* Yay, the callback channel's back! Restart any callbacks: */ | |
993 | list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) | |
994 | run_nfsd4_cb(cb); | |
6ff8da08 BF |
995 | } |
996 | ||
5878453d BF |
997 | void nfsd4_do_callback_rpc(struct work_struct *w) |
998 | { | |
999 | struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); | |
fb003923 | 1000 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 1001 | struct rpc_clnt *clnt; |
1da177e4 | 1002 | |
6ff8da08 BF |
1003 | if (clp->cl_cb_flags) |
1004 | nfsd4_process_cb_update(cb); | |
1005 | ||
1006 | clnt = clp->cl_cb_client; | |
1007 | if (!clnt) { | |
1008 | /* Callback channel broken, or client killed; give up: */ | |
5878453d | 1009 | nfsd4_release_cb(cb); |
6ff8da08 | 1010 | return; |
ac94bf58 | 1011 | } |
cee277d9 BF |
1012 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
1013 | cb->cb_ops, cb); | |
1da177e4 | 1014 | } |
b5a1a81e | 1015 | |
5878453d | 1016 | void nfsd4_cb_recall(struct nfs4_delegation *dp) |
b5a1a81e | 1017 | { |
5878453d | 1018 | struct nfsd4_callback *cb = &dp->dl_recall; |
2a74aba7 | 1019 | struct nfs4_client *clp = dp->dl_stid.sc_client; |
b5a1a81e | 1020 | |
5878453d | 1021 | dp->dl_retries = 1; |
fb003923 | 1022 | cb->cb_op = dp; |
5ce8ba25 | 1023 | cb->cb_clp = clp; |
5878453d | 1024 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; |
fb003923 BF |
1025 | cb->cb_msg.rpc_argp = cb; |
1026 | cb->cb_msg.rpc_resp = cb; | |
5878453d BF |
1027 | cb->cb_msg.rpc_cred = callback_cred; |
1028 | ||
1029 | cb->cb_ops = &nfsd4_cb_recall_ops; | |
1030 | dp->dl_retries = 1; | |
b5a1a81e | 1031 | |
9ee1ba54 | 1032 | INIT_LIST_HEAD(&cb->cb_per_client); |
5ce8ba25 BF |
1033 | cb->cb_done = true; |
1034 | ||
229b2a08 | 1035 | run_nfsd4_cb(&dp->dl_recall); |
b5a1a81e | 1036 | } |