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> |
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 | ||
1da177e4 | 52 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
53 | /* args */ |
54 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 55 | u32 nops; |
ef52bff8 | 56 | __be32 *nops_p; |
ab52ae6d | 57 | u32 minorversion; |
38524ab3 AA |
58 | /* res */ |
59 | int status; | |
1da177e4 LT |
60 | }; |
61 | ||
85a56480 CL |
62 | /* |
63 | * Handle decode buffer overflows out-of-line. | |
64 | */ | |
65 | static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) | |
1da177e4 | 66 | { |
85a56480 CL |
67 | dprintk("NFS: %s prematurely hit the end of our receive buffer. " |
68 | "Remaining buffer length is %tu words.\n", | |
69 | func, xdr->end - xdr->p); | |
1da177e4 LT |
70 | } |
71 | ||
a033db48 CL |
72 | static __be32 *xdr_encode_empty_array(__be32 *p) |
73 | { | |
74 | *p++ = xdr_zero; | |
75 | return p; | |
76 | } | |
77 | ||
78 | /* | |
79 | * Encode/decode NFSv4 CB basic data types | |
80 | * | |
81 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
82 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
83 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
84 | * 1 Protocol" | |
85 | */ | |
86 | ||
87 | /* | |
88 | * nfs_cb_opnum4 | |
89 | * | |
90 | * enum nfs_cb_opnum4 { | |
91 | * OP_CB_GETATTR = 3, | |
92 | * ... | |
93 | * }; | |
94 | */ | |
95 | enum nfs_cb_opnum4 { | |
96 | OP_CB_GETATTR = 3, | |
97 | OP_CB_RECALL = 4, | |
98 | OP_CB_LAYOUTRECALL = 5, | |
99 | OP_CB_NOTIFY = 6, | |
100 | OP_CB_PUSH_DELEG = 7, | |
101 | OP_CB_RECALL_ANY = 8, | |
102 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
103 | OP_CB_RECALL_SLOT = 10, | |
104 | OP_CB_SEQUENCE = 11, | |
105 | OP_CB_WANTS_CANCELLED = 12, | |
106 | OP_CB_NOTIFY_LOCK = 13, | |
107 | OP_CB_NOTIFY_DEVICEID = 14, | |
108 | OP_CB_ILLEGAL = 10044 | |
109 | }; | |
110 | ||
111 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
112 | { | |
113 | __be32 *p; | |
114 | ||
115 | p = xdr_reserve_space(xdr, 4); | |
116 | *p = cpu_to_be32(op); | |
117 | } | |
118 | ||
119 | /* | |
120 | * nfs_fh4 | |
121 | * | |
122 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
123 | */ | |
124 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
125 | { | |
126 | u32 length = fh->fh_size; | |
127 | __be32 *p; | |
128 | ||
129 | BUG_ON(length > NFS4_FHSIZE); | |
130 | p = xdr_reserve_space(xdr, 4 + length); | |
131 | xdr_encode_opaque(p, &fh->fh_base, length); | |
132 | } | |
133 | ||
1da177e4 | 134 | /* |
a033db48 CL |
135 | * stateid4 |
136 | * | |
137 | * struct stateid4 { | |
138 | * uint32_t seqid; | |
139 | * opaque other[12]; | |
140 | * }; | |
1da177e4 | 141 | */ |
a033db48 CL |
142 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
143 | { | |
144 | __be32 *p; | |
1da177e4 | 145 | |
a033db48 CL |
146 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
147 | *p++ = cpu_to_be32(sid->si_generation); | |
148 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
149 | } | |
150 | ||
151 | /* | |
152 | * sessionid4 | |
153 | * | |
154 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
155 | */ | |
156 | static void encode_sessionid4(struct xdr_stream *xdr, | |
157 | const struct nfsd4_session *session) | |
9303bbd3 BH |
158 | { |
159 | __be32 *p; | |
160 | ||
a033db48 CL |
161 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
162 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
163 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
164 | } |
165 | ||
85a56480 CL |
166 | /* |
167 | * nfsstat4 | |
168 | */ | |
169 | static const struct { | |
170 | int stat; | |
171 | int errno; | |
172 | } nfs_cb_errtbl[] = { | |
173 | { NFS4_OK, 0 }, | |
174 | { NFS4ERR_PERM, -EPERM }, | |
175 | { NFS4ERR_NOENT, -ENOENT }, | |
176 | { NFS4ERR_IO, -EIO }, | |
177 | { NFS4ERR_NXIO, -ENXIO }, | |
178 | { NFS4ERR_ACCESS, -EACCES }, | |
179 | { NFS4ERR_EXIST, -EEXIST }, | |
180 | { NFS4ERR_XDEV, -EXDEV }, | |
181 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
182 | { NFS4ERR_ISDIR, -EISDIR }, | |
183 | { NFS4ERR_INVAL, -EINVAL }, | |
184 | { NFS4ERR_FBIG, -EFBIG }, | |
185 | { NFS4ERR_NOSPC, -ENOSPC }, | |
186 | { NFS4ERR_ROFS, -EROFS }, | |
187 | { NFS4ERR_MLINK, -EMLINK }, | |
188 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
189 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
190 | { NFS4ERR_DQUOT, -EDQUOT }, | |
191 | { NFS4ERR_STALE, -ESTALE }, | |
192 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
193 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
194 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
195 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
196 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
197 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
198 | { NFS4ERR_LOCKED, -EAGAIN }, | |
199 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
200 | { NFS4ERR_SYMLINK, -ELOOP }, | |
201 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
202 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
203 | { -1, -EIO } | |
204 | }; | |
205 | ||
206 | /* | |
207 | * If we cannot translate the error, the recovery routines should | |
208 | * handle it. | |
209 | * | |
210 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
211 | * not conflict with native Linux error codes. | |
212 | */ | |
213 | static int nfs_cb_stat_to_errno(int status) | |
214 | { | |
215 | int i; | |
216 | ||
217 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
218 | if (nfs_cb_errtbl[i].stat == status) | |
219 | return nfs_cb_errtbl[i].errno; | |
220 | } | |
221 | ||
222 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
223 | return -status; | |
224 | } | |
225 | ||
226 | static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, | |
227 | enum nfsstat4 *status) | |
228 | { | |
229 | __be32 *p; | |
230 | u32 op; | |
231 | ||
232 | p = xdr_inline_decode(xdr, 4 + 4); | |
233 | if (unlikely(p == NULL)) | |
234 | goto out_overflow; | |
235 | op = be32_to_cpup(p++); | |
236 | if (unlikely(op != expected)) | |
237 | goto out_unexpected; | |
238 | *status = be32_to_cpup(p); | |
239 | return 0; | |
240 | out_overflow: | |
241 | print_overflow_msg(__func__, xdr); | |
242 | return -EIO; | |
243 | out_unexpected: | |
244 | dprintk("NFSD: Callback server returned operation %d but " | |
245 | "we issued a request for %d\n", op, expected); | |
246 | return -EIO; | |
247 | } | |
248 | ||
a033db48 CL |
249 | /* |
250 | * CB_COMPOUND4args | |
251 | * | |
252 | * struct CB_COMPOUND4args { | |
253 | * utf8str_cs tag; | |
254 | * uint32_t minorversion; | |
255 | * uint32_t callback_ident; | |
256 | * nfs_cb_argop4 argarray<>; | |
257 | * }; | |
258 | */ | |
259 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
260 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 261 | { |
f00f328f | 262 | __be32 * p; |
1da177e4 | 263 | |
a033db48 CL |
264 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
265 | p = xdr_encode_empty_array(p); /* empty tag */ | |
266 | *p++ = cpu_to_be32(hdr->minorversion); | |
267 | *p++ = cpu_to_be32(hdr->ident); | |
268 | ||
ef52bff8 | 269 | hdr->nops_p = p; |
a033db48 | 270 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
271 | } |
272 | ||
a033db48 CL |
273 | /* |
274 | * Update argarray element count | |
275 | */ | |
ef52bff8 AA |
276 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
277 | { | |
a033db48 CL |
278 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
279 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
280 | } |
281 | ||
85a56480 CL |
282 | /* |
283 | * CB_COMPOUND4res | |
284 | * | |
285 | * struct CB_COMPOUND4res { | |
286 | * nfsstat4 status; | |
287 | * utf8str_cs tag; | |
288 | * nfs_cb_resop4 resarray<>; | |
289 | * }; | |
290 | */ | |
291 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
292 | struct nfs4_cb_compound_hdr *hdr) | |
293 | { | |
294 | u32 length; | |
295 | __be32 *p; | |
296 | ||
297 | p = xdr_inline_decode(xdr, 4 + 4); | |
298 | if (unlikely(p == NULL)) | |
299 | goto out_overflow; | |
300 | hdr->status = be32_to_cpup(p++); | |
301 | /* Ignore the tag */ | |
302 | length = be32_to_cpup(p++); | |
303 | p = xdr_inline_decode(xdr, length + 4); | |
304 | if (unlikely(p == NULL)) | |
305 | goto out_overflow; | |
306 | hdr->nops = be32_to_cpup(p); | |
307 | return 0; | |
308 | out_overflow: | |
309 | print_overflow_msg(__func__, xdr); | |
310 | return -EIO; | |
311 | } | |
312 | ||
a033db48 CL |
313 | /* |
314 | * CB_RECALL4args | |
315 | * | |
316 | * struct CB_RECALL4args { | |
317 | * stateid4 stateid; | |
318 | * bool truncate; | |
319 | * nfs_fh4 fh; | |
320 | * }; | |
321 | */ | |
322 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
323 | const struct nfs4_delegation *dp, | |
324 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 325 | { |
f00f328f | 326 | __be32 *p; |
a033db48 CL |
327 | |
328 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 329 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
330 | |
331 | p = xdr_reserve_space(xdr, 4); | |
332 | *p++ = xdr_zero; /* truncate */ | |
333 | ||
11b9164a | 334 | encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle); |
a033db48 | 335 | |
ef52bff8 | 336 | hdr->nops++; |
1da177e4 LT |
337 | } |
338 | ||
a033db48 CL |
339 | /* |
340 | * CB_SEQUENCE4args | |
341 | * | |
342 | * struct CB_SEQUENCE4args { | |
343 | * sessionid4 csa_sessionid; | |
344 | * sequenceid4 csa_sequenceid; | |
345 | * slotid4 csa_slotid; | |
346 | * slotid4 csa_highest_slotid; | |
347 | * bool csa_cachethis; | |
348 | * referring_call_list4 csa_referring_call_lists<>; | |
349 | * }; | |
350 | */ | |
351 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
352 | const struct nfsd4_callback *cb, | |
353 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 354 | { |
a033db48 | 355 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
356 | __be32 *p; |
357 | ||
358 | if (hdr->minorversion == 0) | |
359 | return; | |
360 | ||
a033db48 CL |
361 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
362 | encode_sessionid4(xdr, session); | |
363 | ||
364 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
365 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
366 | *p++ = xdr_zero; /* csa_slotid */ | |
367 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
368 | *p++ = xdr_zero; /* csa_cachethis */ | |
369 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 370 | |
2af73580 BH |
371 | hdr->nops++; |
372 | } | |
373 | ||
85a56480 CL |
374 | /* |
375 | * CB_SEQUENCE4resok | |
376 | * | |
377 | * struct CB_SEQUENCE4resok { | |
378 | * sessionid4 csr_sessionid; | |
379 | * sequenceid4 csr_sequenceid; | |
380 | * slotid4 csr_slotid; | |
381 | * slotid4 csr_highest_slotid; | |
382 | * slotid4 csr_target_highest_slotid; | |
383 | * }; | |
384 | * | |
385 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
386 | * case NFS4_OK: | |
387 | * CB_SEQUENCE4resok csr_resok4; | |
388 | * default: | |
389 | * void; | |
390 | * }; | |
391 | * | |
392 | * Our current back channel implmentation supports a single backchannel | |
393 | * with a single slot. | |
394 | */ | |
395 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
396 | struct nfsd4_callback *cb) | |
397 | { | |
398 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
399 | struct nfs4_sessionid id; | |
400 | int status; | |
401 | __be32 *p; | |
402 | u32 dummy; | |
403 | ||
404 | status = -ESERVERFAULT; | |
405 | ||
406 | /* | |
407 | * If the server returns different values for sessionID, slotID or | |
408 | * sequence number, the server is looney tunes. | |
409 | */ | |
2c9c8f36 | 410 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
411 | if (unlikely(p == NULL)) |
412 | goto out_overflow; | |
413 | memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); | |
414 | if (memcmp(id.data, session->se_sessionid.data, | |
415 | NFS4_MAX_SESSIONID_LEN) != 0) { | |
416 | dprintk("NFS: %s Invalid session id\n", __func__); | |
417 | goto out; | |
418 | } | |
419 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
420 | ||
421 | dummy = be32_to_cpup(p++); | |
422 | if (dummy != session->se_cb_seq_nr) { | |
423 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
424 | goto out; | |
425 | } | |
426 | ||
427 | dummy = be32_to_cpup(p++); | |
428 | if (dummy != 0) { | |
429 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
430 | goto out; | |
431 | } | |
432 | ||
433 | /* | |
434 | * FIXME: process highest slotid and target highest slotid | |
435 | */ | |
436 | status = 0; | |
437 | out: | |
5423732a BH |
438 | if (status) |
439 | nfsd4_mark_cb_fault(cb->cb_clp, status); | |
85a56480 CL |
440 | return status; |
441 | out_overflow: | |
442 | print_overflow_msg(__func__, xdr); | |
443 | return -EIO; | |
444 | } | |
445 | ||
446 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
447 | struct nfsd4_callback *cb) | |
448 | { | |
449 | enum nfsstat4 nfserr; | |
450 | int status; | |
451 | ||
452 | if (cb->cb_minorversion == 0) | |
453 | return 0; | |
454 | ||
455 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); | |
456 | if (unlikely(status)) | |
457 | goto out; | |
458 | if (unlikely(nfserr != NFS4_OK)) | |
459 | goto out_default; | |
460 | status = decode_cb_sequence4resok(xdr, cb); | |
461 | out: | |
462 | return status; | |
463 | out_default: | |
0af3f814 | 464 | return nfs_cb_stat_to_errno(nfserr); |
85a56480 CL |
465 | } |
466 | ||
a033db48 CL |
467 | /* |
468 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
469 | * | |
470 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
471 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
472 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
473 | * Protocol". | |
474 | */ | |
475 | ||
476 | /* | |
477 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
478 | */ | |
9f06c719 CL |
479 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
480 | void *__unused) | |
1da177e4 | 481 | { |
a033db48 | 482 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
483 | } |
484 | ||
a033db48 CL |
485 | /* |
486 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
487 | */ | |
9f06c719 CL |
488 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
489 | const struct nfsd4_callback *cb) | |
1da177e4 | 490 | { |
34549ab0 | 491 | const struct nfs4_delegation *dp = cb_to_delegation(cb); |
1da177e4 | 492 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 493 | .ident = cb->cb_clp->cl_cb_ident, |
fb003923 | 494 | .minorversion = cb->cb_minorversion, |
1da177e4 LT |
495 | }; |
496 | ||
9f06c719 CL |
497 | encode_cb_compound4args(xdr, &hdr); |
498 | encode_cb_sequence4args(xdr, cb, &hdr); | |
2faf3b43 | 499 | encode_cb_recall4args(xdr, dp, &hdr); |
ef52bff8 | 500 | encode_cb_nops(&hdr); |
1da177e4 LT |
501 | } |
502 | ||
503 | ||
2af73580 | 504 | /* |
85a56480 CL |
505 | * NFSv4.0 and NFSv4.1 XDR decode functions |
506 | * | |
507 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
508 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
509 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
510 | * Protocol". | |
2af73580 | 511 | */ |
2af73580 | 512 | |
bf269551 CL |
513 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
514 | void *__unused) | |
1da177e4 LT |
515 | { |
516 | return 0; | |
517 | } | |
518 | ||
85a56480 CL |
519 | /* |
520 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
521 | */ | |
bf269551 CL |
522 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
523 | struct xdr_stream *xdr, | |
85a56480 | 524 | struct nfsd4_callback *cb) |
1da177e4 | 525 | { |
1da177e4 | 526 | struct nfs4_cb_compound_hdr hdr; |
85a56480 | 527 | enum nfsstat4 nfserr; |
1da177e4 LT |
528 | int status; |
529 | ||
bf269551 | 530 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 531 | if (unlikely(status)) |
1da177e4 | 532 | goto out; |
85a56480 CL |
533 | |
534 | if (cb != NULL) { | |
bf269551 | 535 | status = decode_cb_sequence4res(xdr, cb); |
85a56480 | 536 | if (unlikely(status)) |
0421b5c5 RL |
537 | goto out; |
538 | } | |
85a56480 | 539 | |
bf269551 | 540 | status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); |
85a56480 CL |
541 | if (unlikely(status)) |
542 | goto out; | |
543 | if (unlikely(nfserr != NFS4_OK)) | |
0af3f814 | 544 | status = nfs_cb_stat_to_errno(nfserr); |
1da177e4 LT |
545 | out: |
546 | return status; | |
547 | } | |
548 | ||
c5c707f9 CH |
549 | #ifdef CONFIG_NFSD_PNFS |
550 | /* | |
551 | * CB_LAYOUTRECALL4args | |
552 | * | |
553 | * struct layoutrecall_file4 { | |
554 | * nfs_fh4 lor_fh; | |
555 | * offset4 lor_offset; | |
556 | * length4 lor_length; | |
557 | * stateid4 lor_stateid; | |
558 | * }; | |
559 | * | |
560 | * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { | |
561 | * case LAYOUTRECALL4_FILE: | |
562 | * layoutrecall_file4 lor_layout; | |
563 | * case LAYOUTRECALL4_FSID: | |
564 | * fsid4 lor_fsid; | |
565 | * case LAYOUTRECALL4_ALL: | |
566 | * void; | |
567 | * }; | |
568 | * | |
569 | * struct CB_LAYOUTRECALL4args { | |
570 | * layouttype4 clora_type; | |
571 | * layoutiomode4 clora_iomode; | |
572 | * bool clora_changed; | |
573 | * layoutrecall4 clora_recall; | |
574 | * }; | |
575 | */ | |
576 | static void encode_cb_layout4args(struct xdr_stream *xdr, | |
577 | const struct nfs4_layout_stateid *ls, | |
578 | struct nfs4_cb_compound_hdr *hdr) | |
579 | { | |
580 | __be32 *p; | |
581 | ||
582 | BUG_ON(hdr->minorversion == 0); | |
583 | ||
584 | p = xdr_reserve_space(xdr, 5 * 4); | |
585 | *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); | |
586 | *p++ = cpu_to_be32(ls->ls_layout_type); | |
587 | *p++ = cpu_to_be32(IOMODE_ANY); | |
588 | *p++ = cpu_to_be32(1); | |
589 | *p = cpu_to_be32(RETURN_FILE); | |
590 | ||
591 | encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); | |
592 | ||
593 | p = xdr_reserve_space(xdr, 2 * 8); | |
594 | p = xdr_encode_hyper(p, 0); | |
595 | xdr_encode_hyper(p, NFS4_MAX_UINT64); | |
596 | ||
597 | encode_stateid4(xdr, &ls->ls_recall_sid); | |
598 | ||
599 | hdr->nops++; | |
600 | } | |
601 | ||
602 | static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, | |
603 | struct xdr_stream *xdr, | |
604 | const struct nfsd4_callback *cb) | |
605 | { | |
606 | const struct nfs4_layout_stateid *ls = | |
607 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
608 | struct nfs4_cb_compound_hdr hdr = { | |
609 | .ident = 0, | |
610 | .minorversion = cb->cb_minorversion, | |
611 | }; | |
612 | ||
613 | encode_cb_compound4args(xdr, &hdr); | |
614 | encode_cb_sequence4args(xdr, cb, &hdr); | |
615 | encode_cb_layout4args(xdr, ls, &hdr); | |
616 | encode_cb_nops(&hdr); | |
617 | } | |
618 | ||
619 | static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, | |
620 | struct xdr_stream *xdr, | |
621 | struct nfsd4_callback *cb) | |
622 | { | |
623 | struct nfs4_cb_compound_hdr hdr; | |
624 | enum nfsstat4 nfserr; | |
625 | int status; | |
626 | ||
627 | status = decode_cb_compound4res(xdr, &hdr); | |
628 | if (unlikely(status)) | |
629 | goto out; | |
630 | if (cb) { | |
631 | status = decode_cb_sequence4res(xdr, cb); | |
632 | if (unlikely(status)) | |
633 | goto out; | |
634 | } | |
635 | status = decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &nfserr); | |
636 | if (unlikely(status)) | |
637 | goto out; | |
638 | if (unlikely(nfserr != NFS4_OK)) | |
639 | status = nfs_cb_stat_to_errno(nfserr); | |
640 | out: | |
641 | return status; | |
642 | } | |
643 | #endif /* CONFIG_NFSD_PNFS */ | |
644 | ||
1da177e4 LT |
645 | /* |
646 | * RPC procedure tables | |
647 | */ | |
7d93bd71 CL |
648 | #define PROC(proc, call, argtype, restype) \ |
649 | [NFSPROC4_CLNT_##proc] = { \ | |
650 | .p_proc = NFSPROC4_CB_##call, \ | |
9f06c719 | 651 | .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ |
bf269551 | 652 | .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
653 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
654 | .p_replen = NFS4_dec_##restype##_sz, \ | |
655 | .p_statidx = NFSPROC4_CB_##call, \ | |
656 | .p_name = #proc, \ | |
1da177e4 LT |
657 | } |
658 | ||
7d93bd71 CL |
659 | static struct rpc_procinfo nfs4_cb_procedures[] = { |
660 | PROC(CB_NULL, NULL, cb_null, cb_null), | |
661 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
c5c707f9 CH |
662 | #ifdef CONFIG_NFSD_PNFS |
663 | PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), | |
664 | #endif | |
1da177e4 LT |
665 | }; |
666 | ||
7d93bd71 | 667 | static struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
668 | /* |
669 | * Note on the callback rpc program version number: despite language in rfc | |
670 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
671 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
672 | * in practice that appears to be what implementations use. The section | |
673 | * 18.36.3 language is expected to be fixed in an erratum. | |
674 | */ | |
7d93bd71 CL |
675 | .number = 1, |
676 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
677 | .procs = nfs4_cb_procedures | |
1da177e4 LT |
678 | }; |
679 | ||
a613fa16 | 680 | static const struct rpc_version *nfs_cb_version[] = { |
1da177e4 LT |
681 | &nfs_cb_version4, |
682 | }; | |
683 | ||
a613fa16 | 684 | static const struct rpc_program cb_program; |
ff7d9756 OK |
685 | |
686 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 687 | .program = &cb_program |
ff7d9756 OK |
688 | }; |
689 | ||
690 | #define NFS4_CALLBACK 0x40000000 | |
a613fa16 | 691 | static const struct rpc_program cb_program = { |
7d93bd71 CL |
692 | .name = "nfs4_cb", |
693 | .number = NFS4_CALLBACK, | |
694 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
695 | .version = nfs_cb_version, | |
696 | .stats = &cb_stats, | |
0157d021 | 697 | .pipe_dir_name = "nfsd4_cb", |
ff7d9756 OK |
698 | }; |
699 | ||
3d733711 | 700 | static int max_cb_time(struct net *net) |
595947ac | 701 | { |
3d733711 SK |
702 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
703 | return max(nn->nfsd4_lease/10, (time_t)1) * HZ; | |
595947ac BF |
704 | } |
705 | ||
c6bb3ca2 BF |
706 | static struct rpc_cred *callback_cred; |
707 | ||
708 | int set_callback_cred(void) | |
709 | { | |
710 | if (callback_cred) | |
711 | return 0; | |
712 | callback_cred = rpc_lookup_machine_cred("nfs"); | |
713 | if (!callback_cred) | |
714 | return -ENOMEM; | |
715 | return 0; | |
716 | } | |
717 | ||
2b4cf668 | 718 | static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
c6bb3ca2 BF |
719 | { |
720 | if (clp->cl_minorversion == 0) { | |
721 | return get_rpccred(callback_cred); | |
722 | } else { | |
723 | struct rpc_auth *auth = client->cl_auth; | |
724 | struct auth_cred acred = {}; | |
725 | ||
726 | acred.uid = ses->se_cb_sec.uid; | |
727 | acred.gid = ses->se_cb_sec.gid; | |
728 | return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0); | |
729 | } | |
730 | } | |
2b47eece | 731 | |
d531c008 KM |
732 | static struct rpc_clnt *create_backchannel_client(struct rpc_create_args *args) |
733 | { | |
734 | struct rpc_xprt *xprt; | |
735 | ||
736 | if (args->protocol != XPRT_TRANSPORT_BC_TCP) | |
737 | return rpc_create(args); | |
738 | ||
739 | xprt = args->bc_xprt->xpt_bc_xprt; | |
740 | if (xprt) { | |
741 | xprt_get(xprt); | |
742 | return rpc_create_xprt(args, xprt); | |
743 | } | |
744 | ||
745 | return rpc_create(args); | |
746 | } | |
747 | ||
dcbeaa68 | 748 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 749 | { |
3758cf7e | 750 | int maxtime = max_cb_time(clp->net); |
ae5c7947 | 751 | struct rpc_timeout timeparms = { |
3758cf7e | 752 | .to_initval = maxtime, |
595947ac | 753 | .to_retries = 0, |
3758cf7e | 754 | .to_maxval = maxtime, |
ae5c7947 | 755 | }; |
ae5c7947 | 756 | struct rpc_create_args args = { |
c212cecf | 757 | .net = clp->net, |
07263f1e BF |
758 | .address = (struct sockaddr *) &conn->cb_addr, |
759 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 760 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 761 | .timeout = &timeparms, |
ff7d9756 | 762 | .program = &cb_program, |
b7299f44 | 763 | .version = 0, |
b6b6152c | 764 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
ae5c7947 | 765 | }; |
63c86716 | 766 | struct rpc_clnt *client; |
c6bb3ca2 | 767 | struct rpc_cred *cred; |
1da177e4 | 768 | |
5d18c1c2 | 769 | if (clp->cl_minorversion == 0) { |
03a4e1f6 | 770 | if (!clp->cl_cred.cr_principal && |
39307655 | 771 | (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) |
5d18c1c2 | 772 | return -EINVAL; |
03a4e1f6 | 773 | args.client_name = clp->cl_cred.cr_principal; |
fc8e5a64 | 774 | args.prognumber = conn->cb_prog; |
5d18c1c2 | 775 | args.protocol = XPRT_TRANSPORT_TCP; |
39307655 | 776 | args.authflavor = clp->cl_cred.cr_flavor; |
5d18c1c2 BF |
777 | clp->cl_cb_ident = conn->cb_ident; |
778 | } else { | |
dcbeaa68 BF |
779 | if (!conn->cb_xprt) |
780 | return -EINVAL; | |
781 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
782 | clp->cl_cb_session = ses; | |
07263f1e | 783 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 784 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3c45ddf8 CL |
785 | args.protocol = conn->cb_xprt->xpt_class->xcl_ident | |
786 | XPRT_TRANSPORT_BC; | |
12fc3e92 | 787 | args.authflavor = ses->se_cb_sec.flavor; |
3ddc8bf5 | 788 | } |
ae5c7947 | 789 | /* Create RPC client */ |
d531c008 | 790 | client = create_backchannel_client(&args); |
e1cab5a5 | 791 | if (IS_ERR(client)) { |
a601caed BF |
792 | dprintk("NFSD: couldn't create callback client: %ld\n", |
793 | PTR_ERR(client)); | |
e1cab5a5 BF |
794 | return PTR_ERR(client); |
795 | } | |
c6bb3ca2 BF |
796 | cred = get_backchannel_cred(clp, client, ses); |
797 | if (IS_ERR(cred)) { | |
798 | rpc_shutdown_client(client); | |
799 | return PTR_ERR(cred); | |
800 | } | |
6ff8da08 | 801 | clp->cl_cb_client = client; |
c6bb3ca2 | 802 | clp->cl_cb_cred = cred; |
e1cab5a5 | 803 | return 0; |
a601caed BF |
804 | } |
805 | ||
ecdd03b7 BF |
806 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
807 | { | |
808 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
809 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
810 | } | |
811 | ||
77a3569d BF |
812 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
813 | { | |
814 | clp->cl_cb_state = NFSD4_CB_DOWN; | |
815 | warn_no_callback_path(clp, reason); | |
816 | } | |
817 | ||
5423732a BH |
818 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
819 | { | |
820 | clp->cl_cb_state = NFSD4_CB_FAULT; | |
821 | warn_no_callback_path(clp, reason); | |
822 | } | |
823 | ||
e300a63c BF |
824 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
825 | { | |
cee277d9 | 826 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
827 | |
828 | if (task->tk_status) | |
77a3569d | 829 | nfsd4_mark_cb_down(clp, task->tk_status); |
e300a63c | 830 | else |
77a3569d | 831 | clp->cl_cb_state = NFSD4_CB_UP; |
e300a63c BF |
832 | } |
833 | ||
834 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
835 | /* XXX: release method to ensure we set the cb channel down if |
836 | * necessary on early failure? */ | |
e300a63c BF |
837 | .rpc_call_done = nfsd4_cb_probe_done, |
838 | }; | |
839 | ||
cee277d9 | 840 | static struct workqueue_struct *callback_wq; |
80fc015b | 841 | |
63c86716 | 842 | /* |
5a3c9d71 BF |
843 | * Poke the callback thread to process any updates to the callback |
844 | * parameters, and send a null probe. | |
63c86716 | 845 | */ |
5a3c9d71 BF |
846 | void nfsd4_probe_callback(struct nfs4_client *clp) |
847 | { | |
77a3569d | 848 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
a52d726b | 849 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
f0b5de1b | 850 | nfsd4_run_cb(&clp->cl_cb_null); |
5a3c9d71 BF |
851 | } |
852 | ||
84f5f7cc | 853 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 854 | { |
84f5f7cc BF |
855 | nfsd4_probe_callback(clp); |
856 | flush_workqueue(callback_wq); | |
857 | } | |
63c86716 | 858 | |
5a3c9d71 | 859 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 860 | { |
77a3569d | 861 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
6ff8da08 BF |
862 | spin_lock(&clp->cl_lock); |
863 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 864 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
865 | } |
866 | ||
2a1d1b59 RL |
867 | /* |
868 | * There's currently a single callback channel slot. | |
869 | * If the slot is available, then mark it busy. Otherwise, set the | |
870 | * thread for sleeping on the callback RPC wait queue. | |
871 | */ | |
3ff3600e | 872 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
2a1d1b59 | 873 | { |
2a1d1b59 RL |
874 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
875 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
c6c15e1e TM |
876 | /* Race breaker */ |
877 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
878 | dprintk("%s slot is busy\n", __func__); | |
879 | return false; | |
880 | } | |
881 | rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); | |
2a1d1b59 | 882 | } |
3ff3600e | 883 | return true; |
2a1d1b59 RL |
884 | } |
885 | ||
886 | /* | |
887 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
888 | * slots, and mark callback channel down on communication errors. | |
889 | */ | |
890 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
891 | { | |
5878453d | 892 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 893 | struct nfs4_client *clp = cb->cb_clp; |
8323c3b2 | 894 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 895 | |
fb003923 | 896 | cb->cb_minorversion = minorversion; |
2a1d1b59 | 897 | if (minorversion) { |
3ff3600e | 898 | if (!nfsd41_cb_get_slot(clp, task)) |
2a1d1b59 | 899 | return; |
2a1d1b59 | 900 | } |
5ce8ba25 | 901 | spin_lock(&clp->cl_lock); |
a8f2800b BF |
902 | if (list_empty(&cb->cb_per_client)) { |
903 | /* This is the first call, not a restart */ | |
904 | cb->cb_done = false; | |
905 | list_add(&cb->cb_per_client, &clp->cl_callbacks); | |
906 | } | |
5ce8ba25 | 907 | spin_unlock(&clp->cl_lock); |
2a1d1b59 RL |
908 | rpc_call_start(task); |
909 | } | |
910 | ||
0421b5c5 RL |
911 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
912 | { | |
5878453d | 913 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 914 | struct nfs4_client *clp = cb->cb_clp; |
0421b5c5 RL |
915 | |
916 | dprintk("%s: minorversion=%d\n", __func__, | |
8323c3b2 | 917 | clp->cl_minorversion); |
0421b5c5 | 918 | |
8323c3b2 | 919 | if (clp->cl_minorversion) { |
0421b5c5 | 920 | /* No need for lock, access serialized in nfsd4_cb_prepare */ |
ac7c46f2 | 921 | ++clp->cl_cb_session->se_cb_seq_nr; |
0421b5c5 RL |
922 | clear_bit(0, &clp->cl_cb_slot_busy); |
923 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
924 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
ac7c46f2 | 925 | clp->cl_cb_session->se_cb_seq_nr); |
0421b5c5 | 926 | } |
0421b5c5 | 927 | |
0162ac2b | 928 | if (clp->cl_cb_client != task->tk_client) { |
a8f2800b BF |
929 | /* We're shutting down or changing cl_cb_client; leave |
930 | * it to nfsd4_process_cb_update to restart the call if | |
931 | * necessary. */ | |
4b21d0de BF |
932 | return; |
933 | } | |
934 | ||
5ce8ba25 BF |
935 | if (cb->cb_done) |
936 | return; | |
0162ac2b CH |
937 | |
938 | switch (cb->cb_ops->done(cb, task)) { | |
172c85dd | 939 | case 0: |
0162ac2b CH |
940 | task->tk_status = 0; |
941 | rpc_restart_call_prepare(task); | |
942 | return; | |
943 | case 1: | |
444b6e91 | 944 | break; |
0162ac2b | 945 | case -1: |
63e4863f | 946 | /* Network partition? */ |
77a3569d | 947 | nfsd4_mark_cb_down(clp, task->tk_status); |
0162ac2b CH |
948 | break; |
949 | default: | |
950 | BUG(); | |
63e4863f | 951 | } |
5ce8ba25 | 952 | cb->cb_done = true; |
63e4863f BF |
953 | } |
954 | ||
0162ac2b | 955 | static void nfsd4_cb_release(void *calldata) |
63e4863f | 956 | { |
5878453d | 957 | struct nfsd4_callback *cb = calldata; |
5ce8ba25 | 958 | struct nfs4_client *clp = cb->cb_clp; |
63e4863f | 959 | |
5ce8ba25 BF |
960 | if (cb->cb_done) { |
961 | spin_lock(&clp->cl_lock); | |
962 | list_del(&cb->cb_per_client); | |
963 | spin_unlock(&clp->cl_lock); | |
0162ac2b CH |
964 | |
965 | cb->cb_ops->release(cb); | |
5ce8ba25 | 966 | } |
63e4863f BF |
967 | } |
968 | ||
0162ac2b | 969 | static const struct rpc_call_ops nfsd4_cb_ops = { |
2a1d1b59 | 970 | .rpc_call_prepare = nfsd4_cb_prepare, |
0162ac2b CH |
971 | .rpc_call_done = nfsd4_cb_done, |
972 | .rpc_release = nfsd4_cb_release, | |
63e4863f BF |
973 | }; |
974 | ||
b5a1a81e BF |
975 | int nfsd4_create_callback_queue(void) |
976 | { | |
977 | callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); | |
978 | if (!callback_wq) | |
979 | return -ENOMEM; | |
980 | return 0; | |
981 | } | |
982 | ||
983 | void nfsd4_destroy_callback_queue(void) | |
984 | { | |
985 | destroy_workqueue(callback_wq); | |
986 | } | |
987 | ||
ab707e15 | 988 | /* must be called under the state lock */ |
6ff8da08 | 989 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 990 | { |
a52d726b | 991 | set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
b5a1a81e | 992 | /* |
6ff8da08 | 993 | * Note this won't actually result in a null callback; |
02e1215f | 994 | * instead, nfsd4_run_cb_null() will detect the killed |
6ff8da08 | 995 | * client, destroy the rpc client, and stop: |
b5a1a81e | 996 | */ |
f0b5de1b | 997 | nfsd4_run_cb(&clp->cl_cb_null); |
b5a1a81e | 998 | flush_workqueue(callback_wq); |
b5a1a81e BF |
999 | } |
1000 | ||
dcbeaa68 BF |
1001 | /* requires cl_lock: */ |
1002 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) | |
1003 | { | |
1004 | struct nfsd4_session *s; | |
1005 | struct nfsd4_conn *c; | |
1006 | ||
1007 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { | |
1008 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
1009 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
1010 | return c; | |
1011 | } | |
1012 | } | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
65e4c894 | 1016 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
1017 | { |
1018 | struct nfs4_cb_conn conn; | |
1019 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
1020 | struct nfsd4_session *ses = NULL; |
1021 | struct nfsd4_conn *c; | |
6ff8da08 BF |
1022 | int err; |
1023 | ||
1024 | /* | |
1025 | * This is either an update, or the client dying; in either case, | |
1026 | * kill the old client: | |
1027 | */ | |
1028 | if (clp->cl_cb_client) { | |
1029 | rpc_shutdown_client(clp->cl_cb_client); | |
1030 | clp->cl_cb_client = NULL; | |
c6bb3ca2 BF |
1031 | put_rpccred(clp->cl_cb_cred); |
1032 | clp->cl_cb_cred = NULL; | |
6ff8da08 | 1033 | } |
dcbeaa68 BF |
1034 | if (clp->cl_cb_conn.cb_xprt) { |
1035 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
1036 | clp->cl_cb_conn.cb_xprt = NULL; | |
1037 | } | |
a52d726b | 1038 | if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) |
6ff8da08 BF |
1039 | return; |
1040 | spin_lock(&clp->cl_lock); | |
1041 | /* | |
1042 | * Only serialized callback code is allowed to clear these | |
1043 | * flags; main nfsd code can only set them: | |
1044 | */ | |
a52d726b JL |
1045 | BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); |
1046 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); | |
6ff8da08 | 1047 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
dcbeaa68 BF |
1048 | c = __nfsd4_find_backchannel(clp); |
1049 | if (c) { | |
1050 | svc_xprt_get(c->cn_xprt); | |
1051 | conn.cb_xprt = c->cn_xprt; | |
1052 | ses = c->cn_session; | |
1053 | } | |
6ff8da08 BF |
1054 | spin_unlock(&clp->cl_lock); |
1055 | ||
dcbeaa68 | 1056 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 1057 | if (err) { |
8546ee51 | 1058 | nfsd4_mark_cb_down(clp, err); |
5ce8ba25 BF |
1059 | return; |
1060 | } | |
1061 | /* Yay, the callback channel's back! Restart any callbacks: */ | |
1062 | list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) | |
326129d0 | 1063 | queue_work(callback_wq, &cb->cb_work); |
6ff8da08 BF |
1064 | } |
1065 | ||
02e1215f | 1066 | static void |
0162ac2b | 1067 | nfsd4_run_cb_work(struct work_struct *work) |
5878453d | 1068 | { |
0162ac2b CH |
1069 | struct nfsd4_callback *cb = |
1070 | container_of(work, struct nfsd4_callback, cb_work); | |
fb003923 | 1071 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 1072 | struct rpc_clnt *clnt; |
1da177e4 | 1073 | |
0162ac2b CH |
1074 | if (cb->cb_ops && cb->cb_ops->prepare) |
1075 | cb->cb_ops->prepare(cb); | |
1076 | ||
a52d726b | 1077 | if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) |
6ff8da08 BF |
1078 | nfsd4_process_cb_update(cb); |
1079 | ||
1080 | clnt = clp->cl_cb_client; | |
1081 | if (!clnt) { | |
1082 | /* Callback channel broken, or client killed; give up: */ | |
0162ac2b CH |
1083 | if (cb->cb_ops && cb->cb_ops->release) |
1084 | cb->cb_ops->release(cb); | |
6ff8da08 | 1085 | return; |
ac94bf58 | 1086 | } |
c6bb3ca2 | 1087 | cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
cee277d9 | 1088 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
0162ac2b | 1089 | cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); |
02e1215f JL |
1090 | } |
1091 | ||
f0b5de1b | 1092 | void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, |
0162ac2b | 1093 | struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) |
b5a1a81e | 1094 | { |
5ce8ba25 | 1095 | cb->cb_clp = clp; |
326129d0 | 1096 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; |
fb003923 BF |
1097 | cb->cb_msg.rpc_argp = cb; |
1098 | cb->cb_msg.rpc_resp = cb; | |
0162ac2b CH |
1099 | cb->cb_ops = ops; |
1100 | INIT_WORK(&cb->cb_work, nfsd4_run_cb_work); | |
9ee1ba54 | 1101 | INIT_LIST_HEAD(&cb->cb_per_client); |
5ce8ba25 | 1102 | cb->cb_done = true; |
f0b5de1b | 1103 | } |
5ce8ba25 | 1104 | |
f0b5de1b CH |
1105 | void nfsd4_run_cb(struct nfsd4_callback *cb) |
1106 | { | |
326129d0 | 1107 | queue_work(callback_wq, &cb->cb_work); |
b5a1a81e | 1108 | } |