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Commit | Line | Data |
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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" |
9eb190fc | 42 | #include "xdr4.h" |
1da177e4 LT |
43 | |
44 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
45 | ||
5423732a BH |
46 | static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
47 | ||
1da177e4 LT |
48 | #define NFSPROC4_CB_NULL 0 |
49 | #define NFSPROC4_CB_COMPOUND 1 | |
50 | ||
1da177e4 LT |
51 | /* Index of predefined Linux callback client operations */ |
52 | ||
1da177e4 | 53 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
54 | /* args */ |
55 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 56 | u32 nops; |
ef52bff8 | 57 | __be32 *nops_p; |
ab52ae6d | 58 | u32 minorversion; |
38524ab3 AA |
59 | /* res */ |
60 | int status; | |
1da177e4 LT |
61 | }; |
62 | ||
a033db48 CL |
63 | static __be32 *xdr_encode_empty_array(__be32 *p) |
64 | { | |
65 | *p++ = xdr_zero; | |
66 | return p; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Encode/decode NFSv4 CB basic data types | |
71 | * | |
72 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
73 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
74 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
75 | * 1 Protocol" | |
76 | */ | |
77 | ||
78 | /* | |
79 | * nfs_cb_opnum4 | |
80 | * | |
81 | * enum nfs_cb_opnum4 { | |
82 | * OP_CB_GETATTR = 3, | |
83 | * ... | |
84 | * }; | |
85 | */ | |
86 | enum nfs_cb_opnum4 { | |
87 | OP_CB_GETATTR = 3, | |
88 | OP_CB_RECALL = 4, | |
89 | OP_CB_LAYOUTRECALL = 5, | |
90 | OP_CB_NOTIFY = 6, | |
91 | OP_CB_PUSH_DELEG = 7, | |
92 | OP_CB_RECALL_ANY = 8, | |
93 | OP_CB_RECALLABLE_OBJ_AVAIL = 9, | |
94 | OP_CB_RECALL_SLOT = 10, | |
95 | OP_CB_SEQUENCE = 11, | |
96 | OP_CB_WANTS_CANCELLED = 12, | |
97 | OP_CB_NOTIFY_LOCK = 13, | |
98 | OP_CB_NOTIFY_DEVICEID = 14, | |
9eb190fc | 99 | OP_CB_OFFLOAD = 15, |
a033db48 CL |
100 | OP_CB_ILLEGAL = 10044 |
101 | }; | |
102 | ||
103 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) | |
104 | { | |
105 | __be32 *p; | |
106 | ||
107 | p = xdr_reserve_space(xdr, 4); | |
108 | *p = cpu_to_be32(op); | |
109 | } | |
110 | ||
111 | /* | |
112 | * nfs_fh4 | |
113 | * | |
114 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
115 | */ | |
116 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
117 | { | |
118 | u32 length = fh->fh_size; | |
119 | __be32 *p; | |
120 | ||
121 | BUG_ON(length > NFS4_FHSIZE); | |
122 | p = xdr_reserve_space(xdr, 4 + length); | |
123 | xdr_encode_opaque(p, &fh->fh_base, length); | |
124 | } | |
125 | ||
1da177e4 | 126 | /* |
a033db48 CL |
127 | * stateid4 |
128 | * | |
129 | * struct stateid4 { | |
130 | * uint32_t seqid; | |
131 | * opaque other[12]; | |
132 | * }; | |
1da177e4 | 133 | */ |
a033db48 CL |
134 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
135 | { | |
136 | __be32 *p; | |
1da177e4 | 137 | |
a033db48 CL |
138 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
139 | *p++ = cpu_to_be32(sid->si_generation); | |
140 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
141 | } | |
142 | ||
143 | /* | |
144 | * sessionid4 | |
145 | * | |
146 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
147 | */ | |
148 | static void encode_sessionid4(struct xdr_stream *xdr, | |
149 | const struct nfsd4_session *session) | |
9303bbd3 BH |
150 | { |
151 | __be32 *p; | |
152 | ||
a033db48 CL |
153 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
154 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
155 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
156 | } |
157 | ||
85a56480 CL |
158 | /* |
159 | * nfsstat4 | |
160 | */ | |
161 | static const struct { | |
162 | int stat; | |
163 | int errno; | |
164 | } nfs_cb_errtbl[] = { | |
165 | { NFS4_OK, 0 }, | |
166 | { NFS4ERR_PERM, -EPERM }, | |
167 | { NFS4ERR_NOENT, -ENOENT }, | |
168 | { NFS4ERR_IO, -EIO }, | |
169 | { NFS4ERR_NXIO, -ENXIO }, | |
170 | { NFS4ERR_ACCESS, -EACCES }, | |
171 | { NFS4ERR_EXIST, -EEXIST }, | |
172 | { NFS4ERR_XDEV, -EXDEV }, | |
173 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
174 | { NFS4ERR_ISDIR, -EISDIR }, | |
175 | { NFS4ERR_INVAL, -EINVAL }, | |
176 | { NFS4ERR_FBIG, -EFBIG }, | |
177 | { NFS4ERR_NOSPC, -ENOSPC }, | |
178 | { NFS4ERR_ROFS, -EROFS }, | |
179 | { NFS4ERR_MLINK, -EMLINK }, | |
180 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
181 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
182 | { NFS4ERR_DQUOT, -EDQUOT }, | |
183 | { NFS4ERR_STALE, -ESTALE }, | |
184 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
185 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
186 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
187 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
188 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
189 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
190 | { NFS4ERR_LOCKED, -EAGAIN }, | |
191 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
192 | { NFS4ERR_SYMLINK, -ELOOP }, | |
193 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
194 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
195 | { -1, -EIO } | |
196 | }; | |
197 | ||
198 | /* | |
199 | * If we cannot translate the error, the recovery routines should | |
200 | * handle it. | |
201 | * | |
202 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
203 | * not conflict with native Linux error codes. | |
204 | */ | |
205 | static int nfs_cb_stat_to_errno(int status) | |
206 | { | |
207 | int i; | |
208 | ||
209 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
210 | if (nfs_cb_errtbl[i].stat == status) | |
211 | return nfs_cb_errtbl[i].errno; | |
212 | } | |
213 | ||
214 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
215 | return -status; | |
216 | } | |
217 | ||
47299f79 SA |
218 | static int decode_cb_op_status(struct xdr_stream *xdr, |
219 | enum nfs_cb_opnum4 expected, int *status) | |
85a56480 CL |
220 | { |
221 | __be32 *p; | |
222 | u32 op; | |
223 | ||
224 | p = xdr_inline_decode(xdr, 4 + 4); | |
225 | if (unlikely(p == NULL)) | |
226 | goto out_overflow; | |
227 | op = be32_to_cpup(p++); | |
228 | if (unlikely(op != expected)) | |
229 | goto out_unexpected; | |
ef2a1b3e | 230 | *status = nfs_cb_stat_to_errno(be32_to_cpup(p)); |
85a56480 CL |
231 | return 0; |
232 | out_overflow: | |
85a56480 CL |
233 | return -EIO; |
234 | out_unexpected: | |
235 | dprintk("NFSD: Callback server returned operation %d but " | |
236 | "we issued a request for %d\n", op, expected); | |
237 | return -EIO; | |
238 | } | |
239 | ||
a033db48 CL |
240 | /* |
241 | * CB_COMPOUND4args | |
242 | * | |
243 | * struct CB_COMPOUND4args { | |
244 | * utf8str_cs tag; | |
245 | * uint32_t minorversion; | |
246 | * uint32_t callback_ident; | |
247 | * nfs_cb_argop4 argarray<>; | |
248 | * }; | |
249 | */ | |
250 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
251 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 252 | { |
f00f328f | 253 | __be32 * p; |
1da177e4 | 254 | |
a033db48 CL |
255 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
256 | p = xdr_encode_empty_array(p); /* empty tag */ | |
257 | *p++ = cpu_to_be32(hdr->minorversion); | |
258 | *p++ = cpu_to_be32(hdr->ident); | |
259 | ||
ef52bff8 | 260 | hdr->nops_p = p; |
a033db48 | 261 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
262 | } |
263 | ||
a033db48 CL |
264 | /* |
265 | * Update argarray element count | |
266 | */ | |
ef52bff8 AA |
267 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
268 | { | |
a033db48 CL |
269 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
270 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
271 | } |
272 | ||
85a56480 CL |
273 | /* |
274 | * CB_COMPOUND4res | |
275 | * | |
276 | * struct CB_COMPOUND4res { | |
277 | * nfsstat4 status; | |
278 | * utf8str_cs tag; | |
279 | * nfs_cb_resop4 resarray<>; | |
280 | * }; | |
281 | */ | |
282 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
283 | struct nfs4_cb_compound_hdr *hdr) | |
284 | { | |
285 | u32 length; | |
286 | __be32 *p; | |
287 | ||
288 | p = xdr_inline_decode(xdr, 4 + 4); | |
289 | if (unlikely(p == NULL)) | |
290 | goto out_overflow; | |
291 | hdr->status = be32_to_cpup(p++); | |
292 | /* Ignore the tag */ | |
293 | length = be32_to_cpup(p++); | |
294 | p = xdr_inline_decode(xdr, length + 4); | |
295 | if (unlikely(p == NULL)) | |
296 | goto out_overflow; | |
e86a40bc | 297 | p += XDR_QUADLEN(length); |
85a56480 CL |
298 | hdr->nops = be32_to_cpup(p); |
299 | return 0; | |
300 | out_overflow: | |
85a56480 CL |
301 | return -EIO; |
302 | } | |
303 | ||
a033db48 CL |
304 | /* |
305 | * CB_RECALL4args | |
306 | * | |
307 | * struct CB_RECALL4args { | |
308 | * stateid4 stateid; | |
309 | * bool truncate; | |
310 | * nfs_fh4 fh; | |
311 | * }; | |
312 | */ | |
313 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
314 | const struct nfs4_delegation *dp, | |
315 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 316 | { |
f00f328f | 317 | __be32 *p; |
a033db48 CL |
318 | |
319 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 320 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
321 | |
322 | p = xdr_reserve_space(xdr, 4); | |
323 | *p++ = xdr_zero; /* truncate */ | |
324 | ||
11b9164a | 325 | encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle); |
a033db48 | 326 | |
ef52bff8 | 327 | hdr->nops++; |
1da177e4 LT |
328 | } |
329 | ||
a033db48 CL |
330 | /* |
331 | * CB_SEQUENCE4args | |
332 | * | |
333 | * struct CB_SEQUENCE4args { | |
334 | * sessionid4 csa_sessionid; | |
335 | * sequenceid4 csa_sequenceid; | |
336 | * slotid4 csa_slotid; | |
337 | * slotid4 csa_highest_slotid; | |
338 | * bool csa_cachethis; | |
339 | * referring_call_list4 csa_referring_call_lists<>; | |
340 | * }; | |
341 | */ | |
342 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
343 | const struct nfsd4_callback *cb, | |
344 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 345 | { |
a033db48 | 346 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
347 | __be32 *p; |
348 | ||
349 | if (hdr->minorversion == 0) | |
350 | return; | |
351 | ||
a033db48 CL |
352 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
353 | encode_sessionid4(xdr, session); | |
354 | ||
355 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
356 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
357 | *p++ = xdr_zero; /* csa_slotid */ | |
358 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
359 | *p++ = xdr_zero; /* csa_cachethis */ | |
360 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 361 | |
2af73580 BH |
362 | hdr->nops++; |
363 | } | |
364 | ||
85a56480 CL |
365 | /* |
366 | * CB_SEQUENCE4resok | |
367 | * | |
368 | * struct CB_SEQUENCE4resok { | |
369 | * sessionid4 csr_sessionid; | |
370 | * sequenceid4 csr_sequenceid; | |
371 | * slotid4 csr_slotid; | |
372 | * slotid4 csr_highest_slotid; | |
373 | * slotid4 csr_target_highest_slotid; | |
374 | * }; | |
375 | * | |
376 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
377 | * case NFS4_OK: | |
378 | * CB_SEQUENCE4resok csr_resok4; | |
379 | * default: | |
380 | * void; | |
381 | * }; | |
382 | * | |
383 | * Our current back channel implmentation supports a single backchannel | |
384 | * with a single slot. | |
385 | */ | |
386 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
387 | struct nfsd4_callback *cb) | |
388 | { | |
389 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
82743380 | 390 | int status = -ESERVERFAULT; |
85a56480 CL |
391 | __be32 *p; |
392 | u32 dummy; | |
393 | ||
85a56480 CL |
394 | /* |
395 | * If the server returns different values for sessionID, slotID or | |
396 | * sequence number, the server is looney tunes. | |
397 | */ | |
2c9c8f36 | 398 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
399 | if (unlikely(p == NULL)) |
400 | goto out_overflow; | |
82743380 KM |
401 | |
402 | if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) { | |
85a56480 CL |
403 | dprintk("NFS: %s Invalid session id\n", __func__); |
404 | goto out; | |
405 | } | |
406 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
407 | ||
408 | dummy = be32_to_cpup(p++); | |
409 | if (dummy != session->se_cb_seq_nr) { | |
410 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
411 | goto out; | |
412 | } | |
413 | ||
414 | dummy = be32_to_cpup(p++); | |
415 | if (dummy != 0) { | |
416 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
417 | goto out; | |
418 | } | |
419 | ||
420 | /* | |
421 | * FIXME: process highest slotid and target highest slotid | |
422 | */ | |
423 | status = 0; | |
424 | out: | |
7ba6cad6 | 425 | cb->cb_seq_status = status; |
85a56480 CL |
426 | return status; |
427 | out_overflow: | |
7ba6cad6 KM |
428 | status = -EIO; |
429 | goto out; | |
85a56480 CL |
430 | } |
431 | ||
432 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
433 | struct nfsd4_callback *cb) | |
434 | { | |
85a56480 CL |
435 | int status; |
436 | ||
89dfdc96 | 437 | if (cb->cb_clp->cl_minorversion == 0) |
85a56480 CL |
438 | return 0; |
439 | ||
7ba6cad6 KM |
440 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status); |
441 | if (unlikely(status || cb->cb_seq_status)) | |
ef2a1b3e CH |
442 | return status; |
443 | ||
444 | return decode_cb_sequence4resok(xdr, cb); | |
85a56480 CL |
445 | } |
446 | ||
a033db48 CL |
447 | /* |
448 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
449 | * | |
450 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
451 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
452 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
453 | * Protocol". | |
454 | */ | |
455 | ||
456 | /* | |
457 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
458 | */ | |
9f06c719 | 459 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
1502c81b | 460 | const void *__unused) |
1da177e4 | 461 | { |
a033db48 | 462 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
463 | } |
464 | ||
a033db48 CL |
465 | /* |
466 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
467 | */ | |
9f06c719 | 468 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
1502c81b | 469 | const void *data) |
1da177e4 | 470 | { |
1502c81b | 471 | const struct nfsd4_callback *cb = data; |
34549ab0 | 472 | const struct nfs4_delegation *dp = cb_to_delegation(cb); |
1da177e4 | 473 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 474 | .ident = cb->cb_clp->cl_cb_ident, |
89dfdc96 | 475 | .minorversion = cb->cb_clp->cl_minorversion, |
1da177e4 LT |
476 | }; |
477 | ||
9f06c719 CL |
478 | encode_cb_compound4args(xdr, &hdr); |
479 | encode_cb_sequence4args(xdr, cb, &hdr); | |
2faf3b43 | 480 | encode_cb_recall4args(xdr, dp, &hdr); |
ef52bff8 | 481 | encode_cb_nops(&hdr); |
1da177e4 LT |
482 | } |
483 | ||
484 | ||
2af73580 | 485 | /* |
85a56480 CL |
486 | * NFSv4.0 and NFSv4.1 XDR decode functions |
487 | * | |
488 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
489 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
490 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
491 | * Protocol". | |
2af73580 | 492 | */ |
2af73580 | 493 | |
bf269551 CL |
494 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
495 | void *__unused) | |
1da177e4 LT |
496 | { |
497 | return 0; | |
498 | } | |
499 | ||
85a56480 CL |
500 | /* |
501 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
502 | */ | |
bf269551 CL |
503 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
504 | struct xdr_stream *xdr, | |
d39916c4 | 505 | void *data) |
1da177e4 | 506 | { |
d39916c4 | 507 | struct nfsd4_callback *cb = data; |
1da177e4 LT |
508 | struct nfs4_cb_compound_hdr hdr; |
509 | int status; | |
510 | ||
bf269551 | 511 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 512 | if (unlikely(status)) |
ef2a1b3e | 513 | return status; |
85a56480 CL |
514 | |
515 | if (cb != NULL) { | |
bf269551 | 516 | status = decode_cb_sequence4res(xdr, cb); |
7ba6cad6 | 517 | if (unlikely(status || cb->cb_seq_status)) |
ef2a1b3e | 518 | return status; |
0421b5c5 | 519 | } |
85a56480 | 520 | |
ef2a1b3e | 521 | return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status); |
1da177e4 LT |
522 | } |
523 | ||
c5c707f9 CH |
524 | #ifdef CONFIG_NFSD_PNFS |
525 | /* | |
526 | * CB_LAYOUTRECALL4args | |
527 | * | |
528 | * struct layoutrecall_file4 { | |
529 | * nfs_fh4 lor_fh; | |
530 | * offset4 lor_offset; | |
531 | * length4 lor_length; | |
532 | * stateid4 lor_stateid; | |
533 | * }; | |
534 | * | |
535 | * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { | |
536 | * case LAYOUTRECALL4_FILE: | |
537 | * layoutrecall_file4 lor_layout; | |
538 | * case LAYOUTRECALL4_FSID: | |
539 | * fsid4 lor_fsid; | |
540 | * case LAYOUTRECALL4_ALL: | |
541 | * void; | |
542 | * }; | |
543 | * | |
544 | * struct CB_LAYOUTRECALL4args { | |
545 | * layouttype4 clora_type; | |
546 | * layoutiomode4 clora_iomode; | |
547 | * bool clora_changed; | |
548 | * layoutrecall4 clora_recall; | |
549 | * }; | |
550 | */ | |
551 | static void encode_cb_layout4args(struct xdr_stream *xdr, | |
552 | const struct nfs4_layout_stateid *ls, | |
553 | struct nfs4_cb_compound_hdr *hdr) | |
554 | { | |
555 | __be32 *p; | |
556 | ||
557 | BUG_ON(hdr->minorversion == 0); | |
558 | ||
559 | p = xdr_reserve_space(xdr, 5 * 4); | |
560 | *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); | |
561 | *p++ = cpu_to_be32(ls->ls_layout_type); | |
562 | *p++ = cpu_to_be32(IOMODE_ANY); | |
563 | *p++ = cpu_to_be32(1); | |
564 | *p = cpu_to_be32(RETURN_FILE); | |
565 | ||
566 | encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); | |
567 | ||
568 | p = xdr_reserve_space(xdr, 2 * 8); | |
569 | p = xdr_encode_hyper(p, 0); | |
570 | xdr_encode_hyper(p, NFS4_MAX_UINT64); | |
571 | ||
572 | encode_stateid4(xdr, &ls->ls_recall_sid); | |
573 | ||
574 | hdr->nops++; | |
575 | } | |
576 | ||
577 | static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, | |
578 | struct xdr_stream *xdr, | |
1502c81b | 579 | const void *data) |
c5c707f9 | 580 | { |
1502c81b | 581 | const struct nfsd4_callback *cb = data; |
c5c707f9 CH |
582 | const struct nfs4_layout_stateid *ls = |
583 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
584 | struct nfs4_cb_compound_hdr hdr = { | |
585 | .ident = 0, | |
89dfdc96 | 586 | .minorversion = cb->cb_clp->cl_minorversion, |
c5c707f9 CH |
587 | }; |
588 | ||
589 | encode_cb_compound4args(xdr, &hdr); | |
590 | encode_cb_sequence4args(xdr, cb, &hdr); | |
591 | encode_cb_layout4args(xdr, ls, &hdr); | |
592 | encode_cb_nops(&hdr); | |
593 | } | |
594 | ||
595 | static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, | |
596 | struct xdr_stream *xdr, | |
d39916c4 | 597 | void *data) |
c5c707f9 | 598 | { |
d39916c4 | 599 | struct nfsd4_callback *cb = data; |
c5c707f9 | 600 | struct nfs4_cb_compound_hdr hdr; |
c5c707f9 CH |
601 | int status; |
602 | ||
603 | status = decode_cb_compound4res(xdr, &hdr); | |
604 | if (unlikely(status)) | |
ef2a1b3e CH |
605 | return status; |
606 | ||
c5c707f9 CH |
607 | if (cb) { |
608 | status = decode_cb_sequence4res(xdr, cb); | |
7ba6cad6 | 609 | if (unlikely(status || cb->cb_seq_status)) |
ef2a1b3e | 610 | return status; |
c5c707f9 | 611 | } |
ef2a1b3e | 612 | return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status); |
c5c707f9 CH |
613 | } |
614 | #endif /* CONFIG_NFSD_PNFS */ | |
615 | ||
a188620e JL |
616 | static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so) |
617 | { | |
618 | __be32 *p; | |
619 | ||
620 | p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len); | |
621 | p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8); | |
622 | xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); | |
623 | } | |
624 | ||
625 | static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, | |
626 | struct xdr_stream *xdr, | |
1502c81b | 627 | const void *data) |
a188620e | 628 | { |
1502c81b | 629 | const struct nfsd4_callback *cb = data; |
a188620e JL |
630 | const struct nfsd4_blocked_lock *nbl = |
631 | container_of(cb, struct nfsd4_blocked_lock, nbl_cb); | |
632 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner; | |
633 | struct nfs4_cb_compound_hdr hdr = { | |
634 | .ident = 0, | |
635 | .minorversion = cb->cb_clp->cl_minorversion, | |
636 | }; | |
637 | ||
638 | __be32 *p; | |
639 | ||
640 | BUG_ON(hdr.minorversion == 0); | |
641 | ||
642 | encode_cb_compound4args(xdr, &hdr); | |
643 | encode_cb_sequence4args(xdr, cb, &hdr); | |
644 | ||
645 | p = xdr_reserve_space(xdr, 4); | |
646 | *p = cpu_to_be32(OP_CB_NOTIFY_LOCK); | |
647 | encode_nfs_fh4(xdr, &nbl->nbl_fh); | |
648 | encode_stateowner(xdr, &lo->lo_owner); | |
649 | hdr.nops++; | |
650 | ||
651 | encode_cb_nops(&hdr); | |
652 | } | |
653 | ||
654 | static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp, | |
655 | struct xdr_stream *xdr, | |
d39916c4 | 656 | void *data) |
a188620e | 657 | { |
d39916c4 | 658 | struct nfsd4_callback *cb = data; |
a188620e JL |
659 | struct nfs4_cb_compound_hdr hdr; |
660 | int status; | |
661 | ||
662 | status = decode_cb_compound4res(xdr, &hdr); | |
663 | if (unlikely(status)) | |
664 | return status; | |
665 | ||
666 | if (cb) { | |
667 | status = decode_cb_sequence4res(xdr, cb); | |
668 | if (unlikely(status || cb->cb_seq_status)) | |
669 | return status; | |
670 | } | |
671 | return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status); | |
672 | } | |
673 | ||
9eb190fc OK |
674 | /* |
675 | * struct write_response4 { | |
676 | * stateid4 wr_callback_id<1>; | |
677 | * length4 wr_count; | |
678 | * stable_how4 wr_committed; | |
679 | * verifier4 wr_writeverf; | |
680 | * }; | |
681 | * union offload_info4 switch (nfsstat4 coa_status) { | |
682 | * case NFS4_OK: | |
683 | * write_response4 coa_resok4; | |
684 | * default: | |
685 | * length4 coa_bytes_copied; | |
686 | * }; | |
687 | * struct CB_OFFLOAD4args { | |
688 | * nfs_fh4 coa_fh; | |
689 | * stateid4 coa_stateid; | |
690 | * offload_info4 coa_offload_info; | |
691 | * }; | |
692 | */ | |
693 | static void encode_offload_info4(struct xdr_stream *xdr, | |
694 | __be32 nfserr, | |
695 | const struct nfsd4_copy *cp) | |
696 | { | |
697 | __be32 *p; | |
698 | ||
699 | p = xdr_reserve_space(xdr, 4); | |
700 | *p++ = nfserr; | |
701 | if (!nfserr) { | |
702 | p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); | |
703 | p = xdr_encode_empty_array(p); | |
704 | p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written); | |
705 | *p++ = cpu_to_be32(cp->cp_res.wr_stable_how); | |
706 | p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data, | |
707 | NFS4_VERIFIER_SIZE); | |
708 | } else { | |
709 | p = xdr_reserve_space(xdr, 8); | |
710 | /* We always return success if bytes were written */ | |
711 | p = xdr_encode_hyper(p, 0); | |
712 | } | |
713 | } | |
714 | ||
715 | static void encode_cb_offload4args(struct xdr_stream *xdr, | |
716 | __be32 nfserr, | |
717 | const struct knfsd_fh *fh, | |
718 | const struct nfsd4_copy *cp, | |
719 | struct nfs4_cb_compound_hdr *hdr) | |
720 | { | |
721 | __be32 *p; | |
722 | ||
723 | p = xdr_reserve_space(xdr, 4); | |
724 | *p++ = cpu_to_be32(OP_CB_OFFLOAD); | |
725 | encode_nfs_fh4(xdr, fh); | |
726 | encode_stateid4(xdr, &cp->cp_res.cb_stateid); | |
727 | encode_offload_info4(xdr, nfserr, cp); | |
728 | ||
729 | hdr->nops++; | |
730 | } | |
731 | ||
732 | static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req, | |
733 | struct xdr_stream *xdr, | |
734 | const void *data) | |
735 | { | |
736 | const struct nfsd4_callback *cb = data; | |
737 | const struct nfsd4_copy *cp = | |
738 | container_of(cb, struct nfsd4_copy, cp_cb); | |
739 | struct nfs4_cb_compound_hdr hdr = { | |
740 | .ident = 0, | |
741 | .minorversion = cb->cb_clp->cl_minorversion, | |
742 | }; | |
743 | ||
744 | encode_cb_compound4args(xdr, &hdr); | |
745 | encode_cb_sequence4args(xdr, cb, &hdr); | |
746 | encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr); | |
747 | encode_cb_nops(&hdr); | |
748 | } | |
749 | ||
750 | static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp, | |
751 | struct xdr_stream *xdr, | |
752 | void *data) | |
753 | { | |
754 | struct nfsd4_callback *cb = data; | |
755 | struct nfs4_cb_compound_hdr hdr; | |
756 | int status; | |
757 | ||
758 | status = decode_cb_compound4res(xdr, &hdr); | |
759 | if (unlikely(status)) | |
760 | return status; | |
761 | ||
762 | if (cb) { | |
763 | status = decode_cb_sequence4res(xdr, cb); | |
764 | if (unlikely(status || cb->cb_seq_status)) | |
765 | return status; | |
766 | } | |
767 | return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status); | |
768 | } | |
1da177e4 LT |
769 | /* |
770 | * RPC procedure tables | |
771 | */ | |
7d93bd71 CL |
772 | #define PROC(proc, call, argtype, restype) \ |
773 | [NFSPROC4_CLNT_##proc] = { \ | |
774 | .p_proc = NFSPROC4_CB_##call, \ | |
1502c81b | 775 | .p_encode = nfs4_xdr_enc_##argtype, \ |
d39916c4 | 776 | .p_decode = nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
777 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
778 | .p_replen = NFS4_dec_##restype##_sz, \ | |
779 | .p_statidx = NFSPROC4_CB_##call, \ | |
780 | .p_name = #proc, \ | |
1da177e4 LT |
781 | } |
782 | ||
499b4988 | 783 | static const struct rpc_procinfo nfs4_cb_procedures[] = { |
7d93bd71 CL |
784 | PROC(CB_NULL, NULL, cb_null, cb_null), |
785 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
c5c707f9 CH |
786 | #ifdef CONFIG_NFSD_PNFS |
787 | PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), | |
788 | #endif | |
a188620e | 789 | PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), |
9eb190fc | 790 | PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), |
1da177e4 LT |
791 | }; |
792 | ||
1c5876dd | 793 | static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)]; |
02be49f6 | 794 | static const struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
795 | /* |
796 | * Note on the callback rpc program version number: despite language in rfc | |
797 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
798 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
799 | * in practice that appears to be what implementations use. The section | |
800 | * 18.36.3 language is expected to be fixed in an erratum. | |
801 | */ | |
7d93bd71 CL |
802 | .number = 1, |
803 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
1c5876dd CH |
804 | .procs = nfs4_cb_procedures, |
805 | .counts = nfs4_cb_counts, | |
1da177e4 LT |
806 | }; |
807 | ||
eff79368 TM |
808 | static const struct rpc_version *nfs_cb_version[2] = { |
809 | [1] = &nfs_cb_version4, | |
1da177e4 LT |
810 | }; |
811 | ||
a613fa16 | 812 | static const struct rpc_program cb_program; |
ff7d9756 OK |
813 | |
814 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 815 | .program = &cb_program |
ff7d9756 OK |
816 | }; |
817 | ||
818 | #define NFS4_CALLBACK 0x40000000 | |
a613fa16 | 819 | static const struct rpc_program cb_program = { |
7d93bd71 CL |
820 | .name = "nfs4_cb", |
821 | .number = NFS4_CALLBACK, | |
822 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
823 | .version = nfs_cb_version, | |
824 | .stats = &cb_stats, | |
0157d021 | 825 | .pipe_dir_name = "nfsd4_cb", |
ff7d9756 OK |
826 | }; |
827 | ||
3d733711 | 828 | static int max_cb_time(struct net *net) |
595947ac | 829 | { |
3d733711 SK |
830 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
831 | return max(nn->nfsd4_lease/10, (time_t)1) * HZ; | |
595947ac BF |
832 | } |
833 | ||
a52458b4 | 834 | static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
c6bb3ca2 BF |
835 | { |
836 | if (clp->cl_minorversion == 0) { | |
5e16923b N |
837 | client->cl_principal = clp->cl_cred.cr_targ_princ ? |
838 | clp->cl_cred.cr_targ_princ : "nfs"; | |
839 | ||
a52458b4 | 840 | return get_cred(rpc_machine_cred()); |
c6bb3ca2 | 841 | } else { |
97f68c6b | 842 | struct cred *kcred; |
97f68c6b N |
843 | |
844 | kcred = prepare_kernel_cred(NULL); | |
845 | if (!kcred) | |
846 | return NULL; | |
c6bb3ca2 | 847 | |
8276c902 N |
848 | kcred->uid = ses->se_cb_sec.uid; |
849 | kcred->gid = ses->se_cb_sec.gid; | |
a52458b4 | 850 | return kcred; |
c6bb3ca2 BF |
851 | } |
852 | } | |
2b47eece | 853 | |
dcbeaa68 | 854 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 855 | { |
3758cf7e | 856 | int maxtime = max_cb_time(clp->net); |
ae5c7947 | 857 | struct rpc_timeout timeparms = { |
3758cf7e | 858 | .to_initval = maxtime, |
595947ac | 859 | .to_retries = 0, |
3758cf7e | 860 | .to_maxval = maxtime, |
ae5c7947 | 861 | }; |
ae5c7947 | 862 | struct rpc_create_args args = { |
c212cecf | 863 | .net = clp->net, |
07263f1e BF |
864 | .address = (struct sockaddr *) &conn->cb_addr, |
865 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 866 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 867 | .timeout = &timeparms, |
ff7d9756 | 868 | .program = &cb_program, |
eff79368 | 869 | .version = 1, |
b6b6152c | 870 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
79caa5fa | 871 | .cred = current_cred(), |
ae5c7947 | 872 | }; |
63c86716 | 873 | struct rpc_clnt *client; |
a52458b4 | 874 | const struct cred *cred; |
1da177e4 | 875 | |
5d18c1c2 | 876 | if (clp->cl_minorversion == 0) { |
03a4e1f6 | 877 | if (!clp->cl_cred.cr_principal && |
39307655 | 878 | (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) |
5d18c1c2 | 879 | return -EINVAL; |
03a4e1f6 | 880 | args.client_name = clp->cl_cred.cr_principal; |
fc8e5a64 | 881 | args.prognumber = conn->cb_prog; |
5d18c1c2 | 882 | args.protocol = XPRT_TRANSPORT_TCP; |
39307655 | 883 | args.authflavor = clp->cl_cred.cr_flavor; |
5d18c1c2 BF |
884 | clp->cl_cb_ident = conn->cb_ident; |
885 | } else { | |
dcbeaa68 BF |
886 | if (!conn->cb_xprt) |
887 | return -EINVAL; | |
888 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
889 | clp->cl_cb_session = ses; | |
07263f1e | 890 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 891 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3c45ddf8 CL |
892 | args.protocol = conn->cb_xprt->xpt_class->xcl_ident | |
893 | XPRT_TRANSPORT_BC; | |
12fc3e92 | 894 | args.authflavor = ses->se_cb_sec.flavor; |
3ddc8bf5 | 895 | } |
ae5c7947 | 896 | /* Create RPC client */ |
d50039ea | 897 | client = rpc_create(&args); |
e1cab5a5 | 898 | if (IS_ERR(client)) { |
a601caed BF |
899 | dprintk("NFSD: couldn't create callback client: %ld\n", |
900 | PTR_ERR(client)); | |
e1cab5a5 BF |
901 | return PTR_ERR(client); |
902 | } | |
c6bb3ca2 | 903 | cred = get_backchannel_cred(clp, client, ses); |
1c3da445 | 904 | if (!cred) { |
c6bb3ca2 | 905 | rpc_shutdown_client(client); |
1c3da445 | 906 | return -ENOMEM; |
c6bb3ca2 | 907 | } |
6ff8da08 | 908 | clp->cl_cb_client = client; |
c6bb3ca2 | 909 | clp->cl_cb_cred = cred; |
e1cab5a5 | 910 | return 0; |
a601caed BF |
911 | } |
912 | ||
ecdd03b7 BF |
913 | static void warn_no_callback_path(struct nfs4_client *clp, int reason) |
914 | { | |
915 | dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", | |
916 | (int)clp->cl_name.len, clp->cl_name.data, reason); | |
917 | } | |
918 | ||
77a3569d BF |
919 | static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
920 | { | |
d4f72cb7 BF |
921 | if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
922 | return; | |
77a3569d BF |
923 | clp->cl_cb_state = NFSD4_CB_DOWN; |
924 | warn_no_callback_path(clp, reason); | |
925 | } | |
926 | ||
5423732a BH |
927 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
928 | { | |
d4f72cb7 BF |
929 | if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
930 | return; | |
5423732a BH |
931 | clp->cl_cb_state = NFSD4_CB_FAULT; |
932 | warn_no_callback_path(clp, reason); | |
933 | } | |
934 | ||
e300a63c BF |
935 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
936 | { | |
cee277d9 | 937 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
938 | |
939 | if (task->tk_status) | |
77a3569d | 940 | nfsd4_mark_cb_down(clp, task->tk_status); |
e300a63c | 941 | else |
77a3569d | 942 | clp->cl_cb_state = NFSD4_CB_UP; |
e300a63c BF |
943 | } |
944 | ||
945 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { | |
cee277d9 BF |
946 | /* XXX: release method to ensure we set the cb channel down if |
947 | * necessary on early failure? */ | |
e300a63c BF |
948 | .rpc_call_done = nfsd4_cb_probe_done, |
949 | }; | |
950 | ||
cee277d9 | 951 | static struct workqueue_struct *callback_wq; |
80fc015b | 952 | |
63c86716 | 953 | /* |
5a3c9d71 BF |
954 | * Poke the callback thread to process any updates to the callback |
955 | * parameters, and send a null probe. | |
63c86716 | 956 | */ |
5a3c9d71 BF |
957 | void nfsd4_probe_callback(struct nfs4_client *clp) |
958 | { | |
77a3569d | 959 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
a52d726b | 960 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
f0b5de1b | 961 | nfsd4_run_cb(&clp->cl_cb_null); |
5a3c9d71 BF |
962 | } |
963 | ||
84f5f7cc | 964 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 965 | { |
84f5f7cc BF |
966 | nfsd4_probe_callback(clp); |
967 | flush_workqueue(callback_wq); | |
968 | } | |
63c86716 | 969 | |
5a3c9d71 | 970 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 971 | { |
77a3569d | 972 | clp->cl_cb_state = NFSD4_CB_UNKNOWN; |
6ff8da08 BF |
973 | spin_lock(&clp->cl_lock); |
974 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 975 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
976 | } |
977 | ||
2a1d1b59 RL |
978 | /* |
979 | * There's currently a single callback channel slot. | |
980 | * If the slot is available, then mark it busy. Otherwise, set the | |
981 | * thread for sleeping on the callback RPC wait queue. | |
982 | */ | |
3ff3600e | 983 | static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) |
2a1d1b59 | 984 | { |
2a1d1b59 RL |
985 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
986 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); | |
c6c15e1e TM |
987 | /* Race breaker */ |
988 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
989 | dprintk("%s slot is busy\n", __func__); | |
990 | return false; | |
991 | } | |
992 | rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); | |
2a1d1b59 | 993 | } |
3ff3600e | 994 | return true; |
2a1d1b59 RL |
995 | } |
996 | ||
997 | /* | |
998 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
999 | * slots, and mark callback channel down on communication errors. | |
1000 | */ | |
1001 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
1002 | { | |
5878453d | 1003 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 1004 | struct nfs4_client *clp = cb->cb_clp; |
8323c3b2 | 1005 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 1006 | |
7ba6cad6 KM |
1007 | /* |
1008 | * cb_seq_status is only set in decode_cb_sequence4res, | |
1009 | * and so will remain 1 if an rpc level failure occurs. | |
1010 | */ | |
1011 | cb->cb_seq_status = 1; | |
4399396e | 1012 | cb->cb_status = 0; |
2a1d1b59 | 1013 | if (minorversion) { |
e6abc8ca | 1014 | if (!cb->cb_holds_slot && !nfsd41_cb_get_slot(clp, task)) |
2a1d1b59 | 1015 | return; |
e6abc8ca | 1016 | cb->cb_holds_slot = true; |
2a1d1b59 RL |
1017 | } |
1018 | rpc_call_start(task); | |
1019 | } | |
1020 | ||
7ba6cad6 | 1021 | static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb) |
0421b5c5 | 1022 | { |
8be2d234 | 1023 | struct nfs4_client *clp = cb->cb_clp; |
7ba6cad6 KM |
1024 | struct nfsd4_session *session = clp->cl_cb_session; |
1025 | bool ret = true; | |
0421b5c5 | 1026 | |
7ba6cad6 KM |
1027 | if (!clp->cl_minorversion) { |
1028 | /* | |
1029 | * If the backchannel connection was shut down while this | |
1030 | * task was queued, we need to resubmit it after setting up | |
1031 | * a new backchannel connection. | |
1032 | * | |
1033 | * Note that if we lost our callback connection permanently | |
1034 | * the submission code will error out, so we don't need to | |
1035 | * handle that case here. | |
1036 | */ | |
ae67bd38 | 1037 | if (RPC_SIGNALLED(task)) |
7ba6cad6 KM |
1038 | goto need_restart; |
1039 | ||
1040 | return true; | |
1041 | } | |
0421b5c5 | 1042 | |
e6abc8ca TM |
1043 | if (!cb->cb_holds_slot) |
1044 | goto need_restart; | |
1045 | ||
7ba6cad6 KM |
1046 | switch (cb->cb_seq_status) { |
1047 | case 0: | |
276f03e3 KM |
1048 | /* |
1049 | * No need for lock, access serialized in nfsd4_cb_prepare | |
1050 | * | |
1051 | * RFC5661 20.9.3 | |
1052 | * If CB_SEQUENCE returns an error, then the state of the slot | |
1053 | * (sequence ID, cached reply) MUST NOT change. | |
1054 | */ | |
7ba6cad6 KM |
1055 | ++session->se_cb_seq_nr; |
1056 | break; | |
1057 | case -ESERVERFAULT: | |
1058 | ++session->se_cb_seq_nr; | |
7b4d6da4 | 1059 | /* Fall through */ |
7ba6cad6 KM |
1060 | case 1: |
1061 | case -NFS4ERR_BADSESSION: | |
1062 | nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status); | |
1063 | ret = false; | |
1064 | break; | |
1065 | case -NFS4ERR_DELAY: | |
1066 | if (!rpc_restart_call(task)) | |
1067 | goto out; | |
1068 | ||
1069 | rpc_delay(task, 2 * HZ); | |
1070 | return false; | |
1071 | case -NFS4ERR_BADSLOT: | |
1072 | goto retry_nowait; | |
1073 | case -NFS4ERR_SEQ_MISORDERED: | |
1074 | if (session->se_cb_seq_nr != 1) { | |
1075 | session->se_cb_seq_nr = 1; | |
1076 | goto retry_nowait; | |
1077 | } | |
1078 | break; | |
1079 | default: | |
1080 | dprintk("%s: unprocessed error %d\n", __func__, | |
1081 | cb->cb_seq_status); | |
0421b5c5 | 1082 | } |
0421b5c5 | 1083 | |
e6abc8ca | 1084 | cb->cb_holds_slot = false; |
7ba6cad6 KM |
1085 | clear_bit(0, &clp->cl_cb_slot_busy); |
1086 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
1087 | dprintk("%s: freed slot, new seqid=%d\n", __func__, | |
1088 | clp->cl_cb_session->se_cb_seq_nr); | |
1089 | ||
ae67bd38 | 1090 | if (RPC_SIGNALLED(task)) |
7ba6cad6 KM |
1091 | goto need_restart; |
1092 | out: | |
1093 | return ret; | |
1094 | retry_nowait: | |
1095 | if (rpc_restart_call_prepare(task)) | |
1096 | ret = false; | |
1097 | goto out; | |
1098 | need_restart: | |
1099 | task->tk_status = 0; | |
1100 | cb->cb_need_restart = true; | |
1101 | return false; | |
1102 | } | |
1103 | ||
1104 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) | |
1105 | { | |
1106 | struct nfsd4_callback *cb = calldata; | |
1107 | struct nfs4_client *clp = cb->cb_clp; | |
1108 | ||
1109 | dprintk("%s: minorversion=%d\n", __func__, | |
1110 | clp->cl_minorversion); | |
1111 | ||
1112 | if (!nfsd4_cb_sequence_done(task, cb)) | |
4b21d0de | 1113 | return; |
4b21d0de | 1114 | |
ef2a1b3e CH |
1115 | if (cb->cb_status) { |
1116 | WARN_ON_ONCE(task->tk_status); | |
1117 | task->tk_status = cb->cb_status; | |
1118 | } | |
1119 | ||
0162ac2b | 1120 | switch (cb->cb_ops->done(cb, task)) { |
172c85dd | 1121 | case 0: |
0162ac2b CH |
1122 | task->tk_status = 0; |
1123 | rpc_restart_call_prepare(task); | |
1124 | return; | |
1125 | case 1: | |
444b6e91 | 1126 | break; |
0162ac2b | 1127 | case -1: |
63e4863f | 1128 | /* Network partition? */ |
77a3569d | 1129 | nfsd4_mark_cb_down(clp, task->tk_status); |
0162ac2b CH |
1130 | break; |
1131 | default: | |
1132 | BUG(); | |
63e4863f | 1133 | } |
63e4863f BF |
1134 | } |
1135 | ||
0162ac2b | 1136 | static void nfsd4_cb_release(void *calldata) |
63e4863f | 1137 | { |
5878453d | 1138 | struct nfsd4_callback *cb = calldata; |
0162ac2b | 1139 | |
cba5f62b CH |
1140 | if (cb->cb_need_restart) |
1141 | nfsd4_run_cb(cb); | |
1142 | else | |
0162ac2b | 1143 | cb->cb_ops->release(cb); |
cba5f62b | 1144 | |
63e4863f BF |
1145 | } |
1146 | ||
0162ac2b | 1147 | static const struct rpc_call_ops nfsd4_cb_ops = { |
2a1d1b59 | 1148 | .rpc_call_prepare = nfsd4_cb_prepare, |
0162ac2b CH |
1149 | .rpc_call_done = nfsd4_cb_done, |
1150 | .rpc_release = nfsd4_cb_release, | |
63e4863f BF |
1151 | }; |
1152 | ||
b5a1a81e BF |
1153 | int nfsd4_create_callback_queue(void) |
1154 | { | |
88382036 | 1155 | callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0); |
b5a1a81e BF |
1156 | if (!callback_wq) |
1157 | return -ENOMEM; | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | void nfsd4_destroy_callback_queue(void) | |
1162 | { | |
1163 | destroy_workqueue(callback_wq); | |
1164 | } | |
1165 | ||
ab707e15 | 1166 | /* must be called under the state lock */ |
6ff8da08 | 1167 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 1168 | { |
a52d726b | 1169 | set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
b5a1a81e | 1170 | /* |
6ff8da08 | 1171 | * Note this won't actually result in a null callback; |
02e1215f | 1172 | * instead, nfsd4_run_cb_null() will detect the killed |
6ff8da08 | 1173 | * client, destroy the rpc client, and stop: |
b5a1a81e | 1174 | */ |
f0b5de1b | 1175 | nfsd4_run_cb(&clp->cl_cb_null); |
b5a1a81e | 1176 | flush_workqueue(callback_wq); |
b5a1a81e BF |
1177 | } |
1178 | ||
dcbeaa68 BF |
1179 | /* requires cl_lock: */ |
1180 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) | |
1181 | { | |
1182 | struct nfsd4_session *s; | |
1183 | struct nfsd4_conn *c; | |
1184 | ||
1185 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { | |
1186 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
1187 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
1188 | return c; | |
1189 | } | |
1190 | } | |
1191 | return NULL; | |
1192 | } | |
1193 | ||
65e4c894 | 1194 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
1195 | { |
1196 | struct nfs4_cb_conn conn; | |
1197 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
1198 | struct nfsd4_session *ses = NULL; |
1199 | struct nfsd4_conn *c; | |
6ff8da08 BF |
1200 | int err; |
1201 | ||
1202 | /* | |
1203 | * This is either an update, or the client dying; in either case, | |
1204 | * kill the old client: | |
1205 | */ | |
1206 | if (clp->cl_cb_client) { | |
1207 | rpc_shutdown_client(clp->cl_cb_client); | |
1208 | clp->cl_cb_client = NULL; | |
a52458b4 | 1209 | put_cred(clp->cl_cb_cred); |
c6bb3ca2 | 1210 | clp->cl_cb_cred = NULL; |
6ff8da08 | 1211 | } |
dcbeaa68 BF |
1212 | if (clp->cl_cb_conn.cb_xprt) { |
1213 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
1214 | clp->cl_cb_conn.cb_xprt = NULL; | |
1215 | } | |
a52d726b | 1216 | if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) |
6ff8da08 BF |
1217 | return; |
1218 | spin_lock(&clp->cl_lock); | |
1219 | /* | |
1220 | * Only serialized callback code is allowed to clear these | |
1221 | * flags; main nfsd code can only set them: | |
1222 | */ | |
a52d726b JL |
1223 | BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); |
1224 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); | |
6ff8da08 | 1225 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
dcbeaa68 BF |
1226 | c = __nfsd4_find_backchannel(clp); |
1227 | if (c) { | |
1228 | svc_xprt_get(c->cn_xprt); | |
1229 | conn.cb_xprt = c->cn_xprt; | |
1230 | ses = c->cn_session; | |
1231 | } | |
6ff8da08 BF |
1232 | spin_unlock(&clp->cl_lock); |
1233 | ||
dcbeaa68 | 1234 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 1235 | if (err) { |
8546ee51 | 1236 | nfsd4_mark_cb_down(clp, err); |
5ce8ba25 BF |
1237 | return; |
1238 | } | |
6ff8da08 BF |
1239 | } |
1240 | ||
02e1215f | 1241 | static void |
0162ac2b | 1242 | nfsd4_run_cb_work(struct work_struct *work) |
5878453d | 1243 | { |
0162ac2b CH |
1244 | struct nfsd4_callback *cb = |
1245 | container_of(work, struct nfsd4_callback, cb_work); | |
fb003923 | 1246 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 1247 | struct rpc_clnt *clnt; |
1da177e4 | 1248 | |
cba5f62b CH |
1249 | if (cb->cb_need_restart) { |
1250 | cb->cb_need_restart = false; | |
1251 | } else { | |
1252 | if (cb->cb_ops && cb->cb_ops->prepare) | |
1253 | cb->cb_ops->prepare(cb); | |
1254 | } | |
0162ac2b | 1255 | |
a52d726b | 1256 | if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) |
6ff8da08 BF |
1257 | nfsd4_process_cb_update(cb); |
1258 | ||
1259 | clnt = clp->cl_cb_client; | |
1260 | if (!clnt) { | |
1261 | /* Callback channel broken, or client killed; give up: */ | |
0162ac2b CH |
1262 | if (cb->cb_ops && cb->cb_ops->release) |
1263 | cb->cb_ops->release(cb); | |
6ff8da08 | 1264 | return; |
ac94bf58 | 1265 | } |
4bd9e9b7 CH |
1266 | |
1267 | /* | |
1268 | * Don't send probe messages for 4.1 or later. | |
1269 | */ | |
1270 | if (!cb->cb_ops && clp->cl_minorversion) { | |
1271 | clp->cl_cb_state = NFSD4_CB_UP; | |
1272 | return; | |
1273 | } | |
1274 | ||
c6bb3ca2 | 1275 | cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
cee277d9 | 1276 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, |
0162ac2b | 1277 | cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); |
02e1215f JL |
1278 | } |
1279 | ||
f0b5de1b | 1280 | void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, |
c4cb8974 | 1281 | const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) |
b5a1a81e | 1282 | { |
5ce8ba25 | 1283 | cb->cb_clp = clp; |
326129d0 | 1284 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; |
fb003923 BF |
1285 | cb->cb_msg.rpc_argp = cb; |
1286 | cb->cb_msg.rpc_resp = cb; | |
0162ac2b CH |
1287 | cb->cb_ops = ops; |
1288 | INIT_WORK(&cb->cb_work, nfsd4_run_cb_work); | |
7ba6cad6 | 1289 | cb->cb_seq_status = 1; |
ef2a1b3e | 1290 | cb->cb_status = 0; |
cba5f62b | 1291 | cb->cb_need_restart = false; |
e6abc8ca | 1292 | cb->cb_holds_slot = false; |
f0b5de1b | 1293 | } |
5ce8ba25 | 1294 | |
f0b5de1b CH |
1295 | void nfsd4_run_cb(struct nfsd4_callback *cb) |
1296 | { | |
326129d0 | 1297 | queue_work(callback_wq, &cb->cb_work); |
b5a1a81e | 1298 | } |