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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 | ||
52e89100 | 34 | #include <linux/nfs4.h> |
1da177e4 | 35 | #include <linux/sunrpc/clnt.h> |
d531c008 | 36 | #include <linux/sunrpc/xprt.h> |
b5a1a81e | 37 | #include <linux/sunrpc/svc_xprt.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
9a74af21 BH |
39 | #include "nfsd.h" |
40 | #include "state.h" | |
3d733711 | 41 | #include "netns.h" |
1eace0d1 | 42 | #include "trace.h" |
06b332a5 | 43 | #include "xdr4cb.h" |
9eb190fc | 44 | #include "xdr4.h" |
1da177e4 LT |
45 | |
46 | #define NFSDDBG_FACILITY NFSDDBG_PROC | |
47 | ||
627fb183 | 48 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp); |
5423732a | 49 | |
1da177e4 LT |
50 | #define NFSPROC4_CB_NULL 0 |
51 | #define NFSPROC4_CB_COMPOUND 1 | |
52 | ||
1da177e4 LT |
53 | /* Index of predefined Linux callback client operations */ |
54 | ||
1da177e4 | 55 | struct nfs4_cb_compound_hdr { |
38524ab3 AA |
56 | /* args */ |
57 | u32 ident; /* minorversion 0 only */ | |
1da177e4 | 58 | u32 nops; |
ef52bff8 | 59 | __be32 *nops_p; |
ab52ae6d | 60 | u32 minorversion; |
38524ab3 AA |
61 | /* res */ |
62 | int status; | |
1da177e4 LT |
63 | }; |
64 | ||
a033db48 CL |
65 | static __be32 *xdr_encode_empty_array(__be32 *p) |
66 | { | |
67 | *p++ = xdr_zero; | |
68 | return p; | |
69 | } | |
70 | ||
71 | /* | |
72 | * Encode/decode NFSv4 CB basic data types | |
73 | * | |
74 | * Basic NFSv4 callback data types are defined in section 15 of RFC | |
75 | * 3530: "Network File System (NFS) version 4 Protocol" and section | |
76 | * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version | |
77 | * 1 Protocol" | |
78 | */ | |
79 | ||
3959066b DN |
80 | static void encode_uint32(struct xdr_stream *xdr, u32 n) |
81 | { | |
82 | WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0); | |
83 | } | |
84 | ||
85 | static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap, | |
86 | size_t len) | |
87 | { | |
6487a13b DN |
88 | xdr_stream_encode_uint32_array(xdr, bitmap, len); |
89 | } | |
90 | ||
91 | static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap, | |
92 | struct nfs4_cb_fattr *fattr) | |
93 | { | |
94 | fattr->ncf_cb_change = 0; | |
95 | fattr->ncf_cb_fsize = 0; | |
96 | if (bitmap[0] & FATTR4_WORD0_CHANGE) | |
97 | if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0) | |
98 | return -NFSERR_BAD_XDR; | |
99 | if (bitmap[0] & FATTR4_WORD0_SIZE) | |
100 | if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0) | |
101 | return -NFSERR_BAD_XDR; | |
102 | return 0; | |
3959066b DN |
103 | } |
104 | ||
a033db48 CL |
105 | static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) |
106 | { | |
107 | __be32 *p; | |
108 | ||
109 | p = xdr_reserve_space(xdr, 4); | |
110 | *p = cpu_to_be32(op); | |
111 | } | |
112 | ||
113 | /* | |
114 | * nfs_fh4 | |
115 | * | |
116 | * typedef opaque nfs_fh4<NFS4_FHSIZE>; | |
117 | */ | |
118 | static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) | |
119 | { | |
120 | u32 length = fh->fh_size; | |
121 | __be32 *p; | |
122 | ||
123 | BUG_ON(length > NFS4_FHSIZE); | |
124 | p = xdr_reserve_space(xdr, 4 + length); | |
d8b26071 | 125 | xdr_encode_opaque(p, &fh->fh_raw, length); |
a033db48 CL |
126 | } |
127 | ||
1da177e4 | 128 | /* |
a033db48 CL |
129 | * stateid4 |
130 | * | |
131 | * struct stateid4 { | |
132 | * uint32_t seqid; | |
133 | * opaque other[12]; | |
134 | * }; | |
1da177e4 | 135 | */ |
a033db48 CL |
136 | static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
137 | { | |
138 | __be32 *p; | |
1da177e4 | 139 | |
a033db48 CL |
140 | p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
141 | *p++ = cpu_to_be32(sid->si_generation); | |
142 | xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); | |
143 | } | |
144 | ||
145 | /* | |
146 | * sessionid4 | |
147 | * | |
148 | * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; | |
149 | */ | |
150 | static void encode_sessionid4(struct xdr_stream *xdr, | |
151 | const struct nfsd4_session *session) | |
9303bbd3 BH |
152 | { |
153 | __be32 *p; | |
154 | ||
a033db48 CL |
155 | p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
156 | xdr_encode_opaque_fixed(p, session->se_sessionid.data, | |
157 | NFS4_MAX_SESSIONID_LEN); | |
9303bbd3 BH |
158 | } |
159 | ||
85a56480 CL |
160 | /* |
161 | * nfsstat4 | |
162 | */ | |
163 | static const struct { | |
164 | int stat; | |
165 | int errno; | |
166 | } nfs_cb_errtbl[] = { | |
167 | { NFS4_OK, 0 }, | |
168 | { NFS4ERR_PERM, -EPERM }, | |
169 | { NFS4ERR_NOENT, -ENOENT }, | |
170 | { NFS4ERR_IO, -EIO }, | |
171 | { NFS4ERR_NXIO, -ENXIO }, | |
172 | { NFS4ERR_ACCESS, -EACCES }, | |
173 | { NFS4ERR_EXIST, -EEXIST }, | |
174 | { NFS4ERR_XDEV, -EXDEV }, | |
175 | { NFS4ERR_NOTDIR, -ENOTDIR }, | |
176 | { NFS4ERR_ISDIR, -EISDIR }, | |
177 | { NFS4ERR_INVAL, -EINVAL }, | |
178 | { NFS4ERR_FBIG, -EFBIG }, | |
179 | { NFS4ERR_NOSPC, -ENOSPC }, | |
180 | { NFS4ERR_ROFS, -EROFS }, | |
181 | { NFS4ERR_MLINK, -EMLINK }, | |
182 | { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, | |
183 | { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, | |
184 | { NFS4ERR_DQUOT, -EDQUOT }, | |
185 | { NFS4ERR_STALE, -ESTALE }, | |
186 | { NFS4ERR_BADHANDLE, -EBADHANDLE }, | |
187 | { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, | |
188 | { NFS4ERR_NOTSUPP, -ENOTSUPP }, | |
189 | { NFS4ERR_TOOSMALL, -ETOOSMALL }, | |
190 | { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, | |
191 | { NFS4ERR_BADTYPE, -EBADTYPE }, | |
192 | { NFS4ERR_LOCKED, -EAGAIN }, | |
193 | { NFS4ERR_RESOURCE, -EREMOTEIO }, | |
194 | { NFS4ERR_SYMLINK, -ELOOP }, | |
195 | { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, | |
196 | { NFS4ERR_DEADLOCK, -EDEADLK }, | |
197 | { -1, -EIO } | |
198 | }; | |
199 | ||
200 | /* | |
201 | * If we cannot translate the error, the recovery routines should | |
202 | * handle it. | |
203 | * | |
204 | * Note: remaining NFSv4 error codes have values > 10000, so should | |
205 | * not conflict with native Linux error codes. | |
206 | */ | |
207 | static int nfs_cb_stat_to_errno(int status) | |
208 | { | |
209 | int i; | |
210 | ||
211 | for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { | |
212 | if (nfs_cb_errtbl[i].stat == status) | |
213 | return nfs_cb_errtbl[i].errno; | |
214 | } | |
215 | ||
216 | dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); | |
217 | return -status; | |
218 | } | |
219 | ||
47299f79 SA |
220 | static int decode_cb_op_status(struct xdr_stream *xdr, |
221 | enum nfs_cb_opnum4 expected, int *status) | |
85a56480 CL |
222 | { |
223 | __be32 *p; | |
224 | u32 op; | |
225 | ||
226 | p = xdr_inline_decode(xdr, 4 + 4); | |
227 | if (unlikely(p == NULL)) | |
228 | goto out_overflow; | |
229 | op = be32_to_cpup(p++); | |
230 | if (unlikely(op != expected)) | |
231 | goto out_unexpected; | |
ef2a1b3e | 232 | *status = nfs_cb_stat_to_errno(be32_to_cpup(p)); |
85a56480 CL |
233 | return 0; |
234 | out_overflow: | |
85a56480 CL |
235 | return -EIO; |
236 | out_unexpected: | |
237 | dprintk("NFSD: Callback server returned operation %d but " | |
238 | "we issued a request for %d\n", op, expected); | |
239 | return -EIO; | |
240 | } | |
241 | ||
a033db48 CL |
242 | /* |
243 | * CB_COMPOUND4args | |
244 | * | |
245 | * struct CB_COMPOUND4args { | |
246 | * utf8str_cs tag; | |
247 | * uint32_t minorversion; | |
248 | * uint32_t callback_ident; | |
249 | * nfs_cb_argop4 argarray<>; | |
250 | * }; | |
251 | */ | |
252 | static void encode_cb_compound4args(struct xdr_stream *xdr, | |
253 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 254 | { |
f00f328f | 255 | __be32 * p; |
1da177e4 | 256 | |
a033db48 CL |
257 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
258 | p = xdr_encode_empty_array(p); /* empty tag */ | |
259 | *p++ = cpu_to_be32(hdr->minorversion); | |
260 | *p++ = cpu_to_be32(hdr->ident); | |
261 | ||
ef52bff8 | 262 | hdr->nops_p = p; |
a033db48 | 263 | *p = cpu_to_be32(hdr->nops); /* argarray element count */ |
1da177e4 LT |
264 | } |
265 | ||
a033db48 CL |
266 | /* |
267 | * Update argarray element count | |
268 | */ | |
ef52bff8 AA |
269 | static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
270 | { | |
a033db48 CL |
271 | BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
272 | *hdr->nops_p = cpu_to_be32(hdr->nops); | |
ef52bff8 AA |
273 | } |
274 | ||
85a56480 CL |
275 | /* |
276 | * CB_COMPOUND4res | |
277 | * | |
278 | * struct CB_COMPOUND4res { | |
279 | * nfsstat4 status; | |
280 | * utf8str_cs tag; | |
281 | * nfs_cb_resop4 resarray<>; | |
282 | * }; | |
283 | */ | |
284 | static int decode_cb_compound4res(struct xdr_stream *xdr, | |
285 | struct nfs4_cb_compound_hdr *hdr) | |
286 | { | |
287 | u32 length; | |
288 | __be32 *p; | |
289 | ||
290 | p = xdr_inline_decode(xdr, 4 + 4); | |
291 | if (unlikely(p == NULL)) | |
292 | goto out_overflow; | |
293 | hdr->status = be32_to_cpup(p++); | |
294 | /* Ignore the tag */ | |
295 | length = be32_to_cpup(p++); | |
296 | p = xdr_inline_decode(xdr, length + 4); | |
297 | if (unlikely(p == NULL)) | |
298 | goto out_overflow; | |
e86a40bc | 299 | p += XDR_QUADLEN(length); |
85a56480 CL |
300 | hdr->nops = be32_to_cpup(p); |
301 | return 0; | |
302 | out_overflow: | |
85a56480 CL |
303 | return -EIO; |
304 | } | |
305 | ||
a033db48 CL |
306 | /* |
307 | * CB_RECALL4args | |
308 | * | |
309 | * struct CB_RECALL4args { | |
310 | * stateid4 stateid; | |
311 | * bool truncate; | |
312 | * nfs_fh4 fh; | |
313 | * }; | |
314 | */ | |
315 | static void encode_cb_recall4args(struct xdr_stream *xdr, | |
316 | const struct nfs4_delegation *dp, | |
317 | struct nfs4_cb_compound_hdr *hdr) | |
1da177e4 | 318 | { |
f00f328f | 319 | __be32 *p; |
a033db48 CL |
320 | |
321 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); | |
d5477a8d | 322 | encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
a033db48 CL |
323 | |
324 | p = xdr_reserve_space(xdr, 4); | |
325 | *p++ = xdr_zero; /* truncate */ | |
326 | ||
11b9164a | 327 | encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle); |
a033db48 | 328 | |
ef52bff8 | 329 | hdr->nops++; |
1da177e4 LT |
330 | } |
331 | ||
3959066b DN |
332 | /* |
333 | * CB_RECALLANY4args | |
334 | * | |
335 | * struct CB_RECALLANY4args { | |
336 | * uint32_t craa_objects_to_keep; | |
337 | * bitmap4 craa_type_mask; | |
338 | * }; | |
339 | */ | |
340 | static void | |
341 | encode_cb_recallany4args(struct xdr_stream *xdr, | |
342 | struct nfs4_cb_compound_hdr *hdr, struct nfsd4_cb_recall_any *ra) | |
343 | { | |
344 | encode_nfs_cb_opnum4(xdr, OP_CB_RECALL_ANY); | |
345 | encode_uint32(xdr, ra->ra_keep); | |
346 | encode_bitmap4(xdr, ra->ra_bmval, ARRAY_SIZE(ra->ra_bmval)); | |
347 | hdr->nops++; | |
348 | } | |
349 | ||
6487a13b DN |
350 | /* |
351 | * CB_GETATTR4args | |
352 | * struct CB_GETATTR4args { | |
353 | * nfs_fh4 fh; | |
354 | * bitmap4 attr_request; | |
355 | * }; | |
356 | * | |
357 | * The size and change attributes are the only one | |
358 | * guaranteed to be serviced by the client. | |
359 | */ | |
360 | static void | |
361 | encode_cb_getattr4args(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr, | |
362 | struct nfs4_cb_fattr *fattr) | |
363 | { | |
364 | struct nfs4_delegation *dp = | |
365 | container_of(fattr, struct nfs4_delegation, dl_cb_fattr); | |
366 | struct knfsd_fh *fh = &dp->dl_stid.sc_file->fi_fhandle; | |
367 | ||
368 | encode_nfs_cb_opnum4(xdr, OP_CB_GETATTR); | |
369 | encode_nfs_fh4(xdr, fh); | |
370 | encode_bitmap4(xdr, fattr->ncf_cb_bmap, ARRAY_SIZE(fattr->ncf_cb_bmap)); | |
371 | hdr->nops++; | |
372 | } | |
373 | ||
a033db48 CL |
374 | /* |
375 | * CB_SEQUENCE4args | |
376 | * | |
377 | * struct CB_SEQUENCE4args { | |
378 | * sessionid4 csa_sessionid; | |
379 | * sequenceid4 csa_sequenceid; | |
380 | * slotid4 csa_slotid; | |
381 | * slotid4 csa_highest_slotid; | |
382 | * bool csa_cachethis; | |
383 | * referring_call_list4 csa_referring_call_lists<>; | |
384 | * }; | |
385 | */ | |
386 | static void encode_cb_sequence4args(struct xdr_stream *xdr, | |
387 | const struct nfsd4_callback *cb, | |
388 | struct nfs4_cb_compound_hdr *hdr) | |
2af73580 | 389 | { |
a033db48 | 390 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
2af73580 BH |
391 | __be32 *p; |
392 | ||
393 | if (hdr->minorversion == 0) | |
394 | return; | |
395 | ||
a033db48 CL |
396 | encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
397 | encode_sessionid4(xdr, session); | |
398 | ||
399 | p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); | |
400 | *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ | |
401 | *p++ = xdr_zero; /* csa_slotid */ | |
402 | *p++ = xdr_zero; /* csa_highest_slotid */ | |
403 | *p++ = xdr_zero; /* csa_cachethis */ | |
404 | xdr_encode_empty_array(p); /* csa_referring_call_lists */ | |
2af73580 | 405 | |
2af73580 BH |
406 | hdr->nops++; |
407 | } | |
408 | ||
85a56480 CL |
409 | /* |
410 | * CB_SEQUENCE4resok | |
411 | * | |
412 | * struct CB_SEQUENCE4resok { | |
413 | * sessionid4 csr_sessionid; | |
414 | * sequenceid4 csr_sequenceid; | |
415 | * slotid4 csr_slotid; | |
416 | * slotid4 csr_highest_slotid; | |
417 | * slotid4 csr_target_highest_slotid; | |
418 | * }; | |
419 | * | |
420 | * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { | |
421 | * case NFS4_OK: | |
422 | * CB_SEQUENCE4resok csr_resok4; | |
423 | * default: | |
424 | * void; | |
425 | * }; | |
426 | * | |
427 | * Our current back channel implmentation supports a single backchannel | |
428 | * with a single slot. | |
429 | */ | |
430 | static int decode_cb_sequence4resok(struct xdr_stream *xdr, | |
431 | struct nfsd4_callback *cb) | |
432 | { | |
433 | struct nfsd4_session *session = cb->cb_clp->cl_cb_session; | |
82743380 | 434 | int status = -ESERVERFAULT; |
85a56480 CL |
435 | __be32 *p; |
436 | u32 dummy; | |
437 | ||
85a56480 CL |
438 | /* |
439 | * If the server returns different values for sessionID, slotID or | |
440 | * sequence number, the server is looney tunes. | |
441 | */ | |
2c9c8f36 | 442 | p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
85a56480 CL |
443 | if (unlikely(p == NULL)) |
444 | goto out_overflow; | |
82743380 KM |
445 | |
446 | if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) { | |
85a56480 CL |
447 | dprintk("NFS: %s Invalid session id\n", __func__); |
448 | goto out; | |
449 | } | |
450 | p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); | |
451 | ||
452 | dummy = be32_to_cpup(p++); | |
453 | if (dummy != session->se_cb_seq_nr) { | |
454 | dprintk("NFS: %s Invalid sequence number\n", __func__); | |
455 | goto out; | |
456 | } | |
457 | ||
458 | dummy = be32_to_cpup(p++); | |
459 | if (dummy != 0) { | |
460 | dprintk("NFS: %s Invalid slotid\n", __func__); | |
461 | goto out; | |
462 | } | |
463 | ||
464 | /* | |
465 | * FIXME: process highest slotid and target highest slotid | |
466 | */ | |
467 | status = 0; | |
468 | out: | |
7ba6cad6 | 469 | cb->cb_seq_status = status; |
85a56480 CL |
470 | return status; |
471 | out_overflow: | |
7ba6cad6 KM |
472 | status = -EIO; |
473 | goto out; | |
85a56480 CL |
474 | } |
475 | ||
476 | static int decode_cb_sequence4res(struct xdr_stream *xdr, | |
477 | struct nfsd4_callback *cb) | |
478 | { | |
85a56480 CL |
479 | int status; |
480 | ||
89dfdc96 | 481 | if (cb->cb_clp->cl_minorversion == 0) |
85a56480 CL |
482 | return 0; |
483 | ||
7ba6cad6 KM |
484 | status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status); |
485 | if (unlikely(status || cb->cb_seq_status)) | |
ef2a1b3e CH |
486 | return status; |
487 | ||
488 | return decode_cb_sequence4resok(xdr, cb); | |
85a56480 CL |
489 | } |
490 | ||
a033db48 CL |
491 | /* |
492 | * NFSv4.0 and NFSv4.1 XDR encode functions | |
493 | * | |
494 | * NFSv4.0 callback argument types are defined in section 15 of RFC | |
495 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
496 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
497 | * Protocol". | |
498 | */ | |
499 | ||
500 | /* | |
501 | * NB: Without this zero space reservation, callbacks over krb5p fail | |
502 | */ | |
9f06c719 | 503 | static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
1502c81b | 504 | const void *__unused) |
1da177e4 | 505 | { |
a033db48 | 506 | xdr_reserve_space(xdr, 0); |
1da177e4 LT |
507 | } |
508 | ||
6487a13b DN |
509 | /* |
510 | * 20.1. Operation 3: CB_GETATTR - Get Attributes | |
511 | */ | |
512 | static void nfs4_xdr_enc_cb_getattr(struct rpc_rqst *req, | |
513 | struct xdr_stream *xdr, const void *data) | |
514 | { | |
515 | const struct nfsd4_callback *cb = data; | |
516 | struct nfs4_cb_fattr *ncf = | |
517 | container_of(cb, struct nfs4_cb_fattr, ncf_getattr); | |
518 | struct nfs4_cb_compound_hdr hdr = { | |
519 | .ident = cb->cb_clp->cl_cb_ident, | |
520 | .minorversion = cb->cb_clp->cl_minorversion, | |
521 | }; | |
522 | ||
523 | encode_cb_compound4args(xdr, &hdr); | |
524 | encode_cb_sequence4args(xdr, cb, &hdr); | |
525 | encode_cb_getattr4args(xdr, &hdr, ncf); | |
526 | encode_cb_nops(&hdr); | |
527 | } | |
528 | ||
a033db48 CL |
529 | /* |
530 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
531 | */ | |
9f06c719 | 532 | static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, |
1502c81b | 533 | const void *data) |
1da177e4 | 534 | { |
1502c81b | 535 | const struct nfsd4_callback *cb = data; |
34549ab0 | 536 | const struct nfs4_delegation *dp = cb_to_delegation(cb); |
1da177e4 | 537 | struct nfs4_cb_compound_hdr hdr = { |
6ff8da08 | 538 | .ident = cb->cb_clp->cl_cb_ident, |
89dfdc96 | 539 | .minorversion = cb->cb_clp->cl_minorversion, |
1da177e4 LT |
540 | }; |
541 | ||
9f06c719 CL |
542 | encode_cb_compound4args(xdr, &hdr); |
543 | encode_cb_sequence4args(xdr, cb, &hdr); | |
2faf3b43 | 544 | encode_cb_recall4args(xdr, dp, &hdr); |
ef52bff8 | 545 | encode_cb_nops(&hdr); |
1da177e4 LT |
546 | } |
547 | ||
3959066b DN |
548 | /* |
549 | * 20.6. Operation 8: CB_RECALL_ANY - Keep Any N Recallable Objects | |
550 | */ | |
551 | static void | |
552 | nfs4_xdr_enc_cb_recall_any(struct rpc_rqst *req, | |
553 | struct xdr_stream *xdr, const void *data) | |
554 | { | |
555 | const struct nfsd4_callback *cb = data; | |
556 | struct nfsd4_cb_recall_any *ra; | |
557 | struct nfs4_cb_compound_hdr hdr = { | |
558 | .ident = cb->cb_clp->cl_cb_ident, | |
559 | .minorversion = cb->cb_clp->cl_minorversion, | |
560 | }; | |
561 | ||
562 | ra = container_of(cb, struct nfsd4_cb_recall_any, ra_cb); | |
563 | encode_cb_compound4args(xdr, &hdr); | |
564 | encode_cb_sequence4args(xdr, cb, &hdr); | |
565 | encode_cb_recallany4args(xdr, &hdr, ra); | |
566 | encode_cb_nops(&hdr); | |
567 | } | |
1da177e4 | 568 | |
2af73580 | 569 | /* |
85a56480 CL |
570 | * NFSv4.0 and NFSv4.1 XDR decode functions |
571 | * | |
572 | * NFSv4.0 callback result types are defined in section 15 of RFC | |
573 | * 3530: "Network File System (NFS) version 4 Protocol" and section 20 | |
574 | * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 | |
575 | * Protocol". | |
2af73580 | 576 | */ |
2af73580 | 577 | |
bf269551 CL |
578 | static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, |
579 | void *__unused) | |
1da177e4 LT |
580 | { |
581 | return 0; | |
582 | } | |
583 | ||
6487a13b DN |
584 | /* |
585 | * 20.1. Operation 3: CB_GETATTR - Get Attributes | |
586 | */ | |
587 | static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst *rqstp, | |
588 | struct xdr_stream *xdr, | |
589 | void *data) | |
590 | { | |
591 | struct nfsd4_callback *cb = data; | |
592 | struct nfs4_cb_compound_hdr hdr; | |
593 | int status; | |
594 | u32 bitmap[3] = {0}; | |
595 | u32 attrlen; | |
596 | struct nfs4_cb_fattr *ncf = | |
597 | container_of(cb, struct nfs4_cb_fattr, ncf_getattr); | |
598 | ||
599 | status = decode_cb_compound4res(xdr, &hdr); | |
600 | if (unlikely(status)) | |
601 | return status; | |
602 | ||
603 | status = decode_cb_sequence4res(xdr, cb); | |
604 | if (unlikely(status || cb->cb_seq_status)) | |
605 | return status; | |
606 | ||
607 | status = decode_cb_op_status(xdr, OP_CB_GETATTR, &cb->cb_status); | |
608 | if (status) | |
609 | return status; | |
610 | if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0) | |
611 | return -NFSERR_BAD_XDR; | |
612 | if (xdr_stream_decode_u32(xdr, &attrlen) < 0) | |
613 | return -NFSERR_BAD_XDR; | |
614 | if (attrlen > (sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize))) | |
615 | return -NFSERR_BAD_XDR; | |
616 | status = decode_cb_fattr4(xdr, bitmap, ncf); | |
617 | return status; | |
618 | } | |
619 | ||
85a56480 CL |
620 | /* |
621 | * 20.2. Operation 4: CB_RECALL - Recall a Delegation | |
622 | */ | |
bf269551 CL |
623 | static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
624 | struct xdr_stream *xdr, | |
d39916c4 | 625 | void *data) |
1da177e4 | 626 | { |
d39916c4 | 627 | struct nfsd4_callback *cb = data; |
1da177e4 LT |
628 | struct nfs4_cb_compound_hdr hdr; |
629 | int status; | |
630 | ||
bf269551 | 631 | status = decode_cb_compound4res(xdr, &hdr); |
85a56480 | 632 | if (unlikely(status)) |
ef2a1b3e | 633 | return status; |
85a56480 | 634 | |
10fa8acf BF |
635 | status = decode_cb_sequence4res(xdr, cb); |
636 | if (unlikely(status || cb->cb_seq_status)) | |
637 | return status; | |
85a56480 | 638 | |
ef2a1b3e | 639 | return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status); |
1da177e4 LT |
640 | } |
641 | ||
3959066b DN |
642 | /* |
643 | * 20.6. Operation 8: CB_RECALL_ANY - Keep Any N Recallable Objects | |
644 | */ | |
645 | static int | |
646 | nfs4_xdr_dec_cb_recall_any(struct rpc_rqst *rqstp, | |
647 | struct xdr_stream *xdr, | |
648 | void *data) | |
649 | { | |
650 | struct nfsd4_callback *cb = data; | |
651 | struct nfs4_cb_compound_hdr hdr; | |
652 | int status; | |
653 | ||
654 | status = decode_cb_compound4res(xdr, &hdr); | |
655 | if (unlikely(status)) | |
656 | return status; | |
657 | status = decode_cb_sequence4res(xdr, cb); | |
658 | if (unlikely(status || cb->cb_seq_status)) | |
659 | return status; | |
660 | status = decode_cb_op_status(xdr, OP_CB_RECALL_ANY, &cb->cb_status); | |
661 | return status; | |
662 | } | |
663 | ||
c5c707f9 CH |
664 | #ifdef CONFIG_NFSD_PNFS |
665 | /* | |
666 | * CB_LAYOUTRECALL4args | |
667 | * | |
668 | * struct layoutrecall_file4 { | |
669 | * nfs_fh4 lor_fh; | |
670 | * offset4 lor_offset; | |
671 | * length4 lor_length; | |
672 | * stateid4 lor_stateid; | |
673 | * }; | |
674 | * | |
675 | * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { | |
676 | * case LAYOUTRECALL4_FILE: | |
677 | * layoutrecall_file4 lor_layout; | |
678 | * case LAYOUTRECALL4_FSID: | |
679 | * fsid4 lor_fsid; | |
680 | * case LAYOUTRECALL4_ALL: | |
681 | * void; | |
682 | * }; | |
683 | * | |
684 | * struct CB_LAYOUTRECALL4args { | |
685 | * layouttype4 clora_type; | |
686 | * layoutiomode4 clora_iomode; | |
687 | * bool clora_changed; | |
688 | * layoutrecall4 clora_recall; | |
689 | * }; | |
690 | */ | |
691 | static void encode_cb_layout4args(struct xdr_stream *xdr, | |
692 | const struct nfs4_layout_stateid *ls, | |
693 | struct nfs4_cb_compound_hdr *hdr) | |
694 | { | |
695 | __be32 *p; | |
696 | ||
697 | BUG_ON(hdr->minorversion == 0); | |
698 | ||
699 | p = xdr_reserve_space(xdr, 5 * 4); | |
700 | *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); | |
701 | *p++ = cpu_to_be32(ls->ls_layout_type); | |
702 | *p++ = cpu_to_be32(IOMODE_ANY); | |
703 | *p++ = cpu_to_be32(1); | |
704 | *p = cpu_to_be32(RETURN_FILE); | |
705 | ||
706 | encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); | |
707 | ||
708 | p = xdr_reserve_space(xdr, 2 * 8); | |
709 | p = xdr_encode_hyper(p, 0); | |
710 | xdr_encode_hyper(p, NFS4_MAX_UINT64); | |
711 | ||
712 | encode_stateid4(xdr, &ls->ls_recall_sid); | |
713 | ||
714 | hdr->nops++; | |
715 | } | |
716 | ||
717 | static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, | |
718 | struct xdr_stream *xdr, | |
1502c81b | 719 | const void *data) |
c5c707f9 | 720 | { |
1502c81b | 721 | const struct nfsd4_callback *cb = data; |
c5c707f9 CH |
722 | const struct nfs4_layout_stateid *ls = |
723 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
724 | struct nfs4_cb_compound_hdr hdr = { | |
725 | .ident = 0, | |
89dfdc96 | 726 | .minorversion = cb->cb_clp->cl_minorversion, |
c5c707f9 CH |
727 | }; |
728 | ||
729 | encode_cb_compound4args(xdr, &hdr); | |
730 | encode_cb_sequence4args(xdr, cb, &hdr); | |
731 | encode_cb_layout4args(xdr, ls, &hdr); | |
732 | encode_cb_nops(&hdr); | |
733 | } | |
734 | ||
735 | static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, | |
736 | struct xdr_stream *xdr, | |
d39916c4 | 737 | void *data) |
c5c707f9 | 738 | { |
d39916c4 | 739 | struct nfsd4_callback *cb = data; |
c5c707f9 | 740 | struct nfs4_cb_compound_hdr hdr; |
c5c707f9 CH |
741 | int status; |
742 | ||
743 | status = decode_cb_compound4res(xdr, &hdr); | |
744 | if (unlikely(status)) | |
ef2a1b3e CH |
745 | return status; |
746 | ||
10fa8acf BF |
747 | status = decode_cb_sequence4res(xdr, cb); |
748 | if (unlikely(status || cb->cb_seq_status)) | |
749 | return status; | |
750 | ||
ef2a1b3e | 751 | return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status); |
c5c707f9 CH |
752 | } |
753 | #endif /* CONFIG_NFSD_PNFS */ | |
754 | ||
a188620e JL |
755 | static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so) |
756 | { | |
757 | __be32 *p; | |
758 | ||
759 | p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len); | |
760 | p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8); | |
761 | xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); | |
762 | } | |
763 | ||
764 | static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, | |
765 | struct xdr_stream *xdr, | |
1502c81b | 766 | const void *data) |
a188620e | 767 | { |
1502c81b | 768 | const struct nfsd4_callback *cb = data; |
a188620e JL |
769 | const struct nfsd4_blocked_lock *nbl = |
770 | container_of(cb, struct nfsd4_blocked_lock, nbl_cb); | |
771 | struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner; | |
772 | struct nfs4_cb_compound_hdr hdr = { | |
773 | .ident = 0, | |
774 | .minorversion = cb->cb_clp->cl_minorversion, | |
775 | }; | |
776 | ||
777 | __be32 *p; | |
778 | ||
779 | BUG_ON(hdr.minorversion == 0); | |
780 | ||
781 | encode_cb_compound4args(xdr, &hdr); | |
782 | encode_cb_sequence4args(xdr, cb, &hdr); | |
783 | ||
784 | p = xdr_reserve_space(xdr, 4); | |
785 | *p = cpu_to_be32(OP_CB_NOTIFY_LOCK); | |
786 | encode_nfs_fh4(xdr, &nbl->nbl_fh); | |
787 | encode_stateowner(xdr, &lo->lo_owner); | |
788 | hdr.nops++; | |
789 | ||
790 | encode_cb_nops(&hdr); | |
791 | } | |
792 | ||
793 | static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp, | |
794 | struct xdr_stream *xdr, | |
d39916c4 | 795 | void *data) |
a188620e | 796 | { |
d39916c4 | 797 | struct nfsd4_callback *cb = data; |
a188620e JL |
798 | struct nfs4_cb_compound_hdr hdr; |
799 | int status; | |
800 | ||
801 | status = decode_cb_compound4res(xdr, &hdr); | |
802 | if (unlikely(status)) | |
803 | return status; | |
804 | ||
10fa8acf BF |
805 | status = decode_cb_sequence4res(xdr, cb); |
806 | if (unlikely(status || cb->cb_seq_status)) | |
807 | return status; | |
808 | ||
a188620e JL |
809 | return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status); |
810 | } | |
811 | ||
9eb190fc OK |
812 | /* |
813 | * struct write_response4 { | |
814 | * stateid4 wr_callback_id<1>; | |
815 | * length4 wr_count; | |
816 | * stable_how4 wr_committed; | |
817 | * verifier4 wr_writeverf; | |
818 | * }; | |
819 | * union offload_info4 switch (nfsstat4 coa_status) { | |
820 | * case NFS4_OK: | |
821 | * write_response4 coa_resok4; | |
822 | * default: | |
a11ada99 | 823 | * length4 coa_bytes_copied; |
9eb190fc OK |
824 | * }; |
825 | * struct CB_OFFLOAD4args { | |
826 | * nfs_fh4 coa_fh; | |
827 | * stateid4 coa_stateid; | |
828 | * offload_info4 coa_offload_info; | |
829 | * }; | |
830 | */ | |
831 | static void encode_offload_info4(struct xdr_stream *xdr, | |
a11ada99 | 832 | const struct nfsd4_cb_offload *cbo) |
9eb190fc OK |
833 | { |
834 | __be32 *p; | |
835 | ||
836 | p = xdr_reserve_space(xdr, 4); | |
a11ada99 CL |
837 | *p = cbo->co_nfserr; |
838 | switch (cbo->co_nfserr) { | |
839 | case nfs_ok: | |
9eb190fc OK |
840 | p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); |
841 | p = xdr_encode_empty_array(p); | |
a11ada99 CL |
842 | p = xdr_encode_hyper(p, cbo->co_res.wr_bytes_written); |
843 | *p++ = cpu_to_be32(cbo->co_res.wr_stable_how); | |
844 | p = xdr_encode_opaque_fixed(p, cbo->co_res.wr_verifier.data, | |
9eb190fc | 845 | NFS4_VERIFIER_SIZE); |
a11ada99 CL |
846 | break; |
847 | default: | |
9eb190fc OK |
848 | p = xdr_reserve_space(xdr, 8); |
849 | /* We always return success if bytes were written */ | |
850 | p = xdr_encode_hyper(p, 0); | |
851 | } | |
852 | } | |
853 | ||
854 | static void encode_cb_offload4args(struct xdr_stream *xdr, | |
a11ada99 | 855 | const struct nfsd4_cb_offload *cbo, |
9eb190fc OK |
856 | struct nfs4_cb_compound_hdr *hdr) |
857 | { | |
858 | __be32 *p; | |
859 | ||
860 | p = xdr_reserve_space(xdr, 4); | |
a11ada99 CL |
861 | *p = cpu_to_be32(OP_CB_OFFLOAD); |
862 | encode_nfs_fh4(xdr, &cbo->co_fh); | |
863 | encode_stateid4(xdr, &cbo->co_res.cb_stateid); | |
864 | encode_offload_info4(xdr, cbo); | |
9eb190fc OK |
865 | |
866 | hdr->nops++; | |
867 | } | |
868 | ||
869 | static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req, | |
870 | struct xdr_stream *xdr, | |
871 | const void *data) | |
872 | { | |
873 | const struct nfsd4_callback *cb = data; | |
a11ada99 CL |
874 | const struct nfsd4_cb_offload *cbo = |
875 | container_of(cb, struct nfsd4_cb_offload, co_cb); | |
9eb190fc OK |
876 | struct nfs4_cb_compound_hdr hdr = { |
877 | .ident = 0, | |
878 | .minorversion = cb->cb_clp->cl_minorversion, | |
879 | }; | |
880 | ||
881 | encode_cb_compound4args(xdr, &hdr); | |
882 | encode_cb_sequence4args(xdr, cb, &hdr); | |
a11ada99 | 883 | encode_cb_offload4args(xdr, cbo, &hdr); |
9eb190fc OK |
884 | encode_cb_nops(&hdr); |
885 | } | |
886 | ||
887 | static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp, | |
888 | struct xdr_stream *xdr, | |
889 | void *data) | |
890 | { | |
891 | struct nfsd4_callback *cb = data; | |
892 | struct nfs4_cb_compound_hdr hdr; | |
893 | int status; | |
894 | ||
895 | status = decode_cb_compound4res(xdr, &hdr); | |
896 | if (unlikely(status)) | |
897 | return status; | |
898 | ||
10fa8acf BF |
899 | status = decode_cb_sequence4res(xdr, cb); |
900 | if (unlikely(status || cb->cb_seq_status)) | |
901 | return status; | |
902 | ||
9eb190fc OK |
903 | return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status); |
904 | } | |
1da177e4 LT |
905 | /* |
906 | * RPC procedure tables | |
907 | */ | |
7d93bd71 CL |
908 | #define PROC(proc, call, argtype, restype) \ |
909 | [NFSPROC4_CLNT_##proc] = { \ | |
910 | .p_proc = NFSPROC4_CB_##call, \ | |
1502c81b | 911 | .p_encode = nfs4_xdr_enc_##argtype, \ |
d39916c4 | 912 | .p_decode = nfs4_xdr_dec_##restype, \ |
7d93bd71 CL |
913 | .p_arglen = NFS4_enc_##argtype##_sz, \ |
914 | .p_replen = NFS4_dec_##restype##_sz, \ | |
915 | .p_statidx = NFSPROC4_CB_##call, \ | |
916 | .p_name = #proc, \ | |
1da177e4 LT |
917 | } |
918 | ||
499b4988 | 919 | static const struct rpc_procinfo nfs4_cb_procedures[] = { |
7d93bd71 CL |
920 | PROC(CB_NULL, NULL, cb_null, cb_null), |
921 | PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), | |
c5c707f9 CH |
922 | #ifdef CONFIG_NFSD_PNFS |
923 | PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), | |
924 | #endif | |
a188620e | 925 | PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), |
9eb190fc | 926 | PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), |
3959066b | 927 | PROC(CB_RECALL_ANY, COMPOUND, cb_recall_any, cb_recall_any), |
6487a13b | 928 | PROC(CB_GETATTR, COMPOUND, cb_getattr, cb_getattr), |
1da177e4 LT |
929 | }; |
930 | ||
1c5876dd | 931 | static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)]; |
02be49f6 | 932 | static const struct rpc_version nfs_cb_version4 = { |
b7299f44 BF |
933 | /* |
934 | * Note on the callback rpc program version number: despite language in rfc | |
935 | * 5661 section 18.36.3 requiring servers to use 4 in this field, the | |
936 | * official xdr descriptions for both 4.0 and 4.1 specify version 1, and | |
937 | * in practice that appears to be what implementations use. The section | |
938 | * 18.36.3 language is expected to be fixed in an erratum. | |
939 | */ | |
7d93bd71 CL |
940 | .number = 1, |
941 | .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), | |
1c5876dd CH |
942 | .procs = nfs4_cb_procedures, |
943 | .counts = nfs4_cb_counts, | |
1da177e4 LT |
944 | }; |
945 | ||
eff79368 TM |
946 | static const struct rpc_version *nfs_cb_version[2] = { |
947 | [1] = &nfs_cb_version4, | |
1da177e4 LT |
948 | }; |
949 | ||
a613fa16 | 950 | static const struct rpc_program cb_program; |
ff7d9756 OK |
951 | |
952 | static struct rpc_stat cb_stats = { | |
7d93bd71 | 953 | .program = &cb_program |
ff7d9756 OK |
954 | }; |
955 | ||
956 | #define NFS4_CALLBACK 0x40000000 | |
a613fa16 | 957 | static const struct rpc_program cb_program = { |
7d93bd71 CL |
958 | .name = "nfs4_cb", |
959 | .number = NFS4_CALLBACK, | |
960 | .nrvers = ARRAY_SIZE(nfs_cb_version), | |
961 | .version = nfs_cb_version, | |
962 | .stats = &cb_stats, | |
0157d021 | 963 | .pipe_dir_name = "nfsd4_cb", |
ff7d9756 OK |
964 | }; |
965 | ||
3d733711 | 966 | static int max_cb_time(struct net *net) |
595947ac | 967 | { |
3d733711 | 968 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
20b7d86f AB |
969 | |
970 | /* | |
971 | * nfsd4_lease is set to at most one hour in __nfsd4_write_time, | |
972 | * so we can use 32-bit math on it. Warn if that assumption | |
973 | * ever stops being true. | |
974 | */ | |
975 | if (WARN_ON_ONCE(nn->nfsd4_lease > 3600)) | |
976 | return 360 * HZ; | |
977 | ||
978 | return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ; | |
595947ac BF |
979 | } |
980 | ||
2bbfed98 TM |
981 | static struct workqueue_struct *callback_wq; |
982 | ||
983 | static bool nfsd4_queue_cb(struct nfsd4_callback *cb) | |
984 | { | |
9a026aec | 985 | trace_nfsd_cb_queue(cb->cb_clp, cb); |
fe0e9580 | 986 | return queue_delayed_work(callback_wq, &cb->cb_work, 0); |
2bbfed98 TM |
987 | } |
988 | ||
989 | static void nfsd41_cb_inflight_begin(struct nfs4_client *clp) | |
990 | { | |
991 | atomic_inc(&clp->cl_cb_inflight); | |
992 | } | |
993 | ||
994 | static void nfsd41_cb_inflight_end(struct nfs4_client *clp) | |
995 | { | |
996 | ||
997 | if (atomic_dec_and_test(&clp->cl_cb_inflight)) | |
998 | wake_up_var(&clp->cl_cb_inflight); | |
999 | } | |
1000 | ||
1001 | static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp) | |
1002 | { | |
1003 | wait_var_event(&clp->cl_cb_inflight, | |
1004 | !atomic_read(&clp->cl_cb_inflight)); | |
1005 | } | |
1006 | ||
a52458b4 | 1007 | static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
c6bb3ca2 BF |
1008 | { |
1009 | if (clp->cl_minorversion == 0) { | |
5e16923b N |
1010 | client->cl_principal = clp->cl_cred.cr_targ_princ ? |
1011 | clp->cl_cred.cr_targ_princ : "nfs"; | |
1012 | ||
a52458b4 | 1013 | return get_cred(rpc_machine_cred()); |
c6bb3ca2 | 1014 | } else { |
97f68c6b | 1015 | struct cred *kcred; |
97f68c6b | 1016 | |
5a17f040 | 1017 | kcred = prepare_kernel_cred(&init_task); |
97f68c6b N |
1018 | if (!kcred) |
1019 | return NULL; | |
c6bb3ca2 | 1020 | |
7de82c2f DN |
1021 | kcred->fsuid = ses->se_cb_sec.uid; |
1022 | kcred->fsgid = ses->se_cb_sec.gid; | |
a52458b4 | 1023 | return kcred; |
c6bb3ca2 BF |
1024 | } |
1025 | } | |
2b47eece | 1026 | |
dcbeaa68 | 1027 | static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
2b47eece | 1028 | { |
3758cf7e | 1029 | int maxtime = max_cb_time(clp->net); |
ae5c7947 | 1030 | struct rpc_timeout timeparms = { |
3758cf7e | 1031 | .to_initval = maxtime, |
595947ac | 1032 | .to_retries = 0, |
3758cf7e | 1033 | .to_maxval = maxtime, |
ae5c7947 | 1034 | }; |
ae5c7947 | 1035 | struct rpc_create_args args = { |
c212cecf | 1036 | .net = clp->net, |
07263f1e BF |
1037 | .address = (struct sockaddr *) &conn->cb_addr, |
1038 | .addrsize = conn->cb_addrlen, | |
6f3d772f | 1039 | .saddress = (struct sockaddr *) &conn->cb_saddr, |
ae5c7947 | 1040 | .timeout = &timeparms, |
ff7d9756 | 1041 | .program = &cb_program, |
eff79368 | 1042 | .version = 1, |
b6b6152c | 1043 | .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
79caa5fa | 1044 | .cred = current_cred(), |
ae5c7947 | 1045 | }; |
63c86716 | 1046 | struct rpc_clnt *client; |
a52458b4 | 1047 | const struct cred *cred; |
1da177e4 | 1048 | |
5d18c1c2 | 1049 | if (clp->cl_minorversion == 0) { |
03a4e1f6 | 1050 | if (!clp->cl_cred.cr_principal && |
1eace0d1 CL |
1051 | (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) { |
1052 | trace_nfsd_cb_setup_err(clp, -EINVAL); | |
5d18c1c2 | 1053 | return -EINVAL; |
1eace0d1 | 1054 | } |
03a4e1f6 | 1055 | args.client_name = clp->cl_cred.cr_principal; |
fc8e5a64 | 1056 | args.prognumber = conn->cb_prog; |
5d18c1c2 | 1057 | args.protocol = XPRT_TRANSPORT_TCP; |
39307655 | 1058 | args.authflavor = clp->cl_cred.cr_flavor; |
5d18c1c2 BF |
1059 | clp->cl_cb_ident = conn->cb_ident; |
1060 | } else { | |
9f57c606 | 1061 | if (!conn->cb_xprt) |
dcbeaa68 | 1062 | return -EINVAL; |
dcbeaa68 | 1063 | clp->cl_cb_session = ses; |
07263f1e | 1064 | args.bc_xprt = conn->cb_xprt; |
8b5ce5cd | 1065 | args.prognumber = clp->cl_cb_session->se_cb_prog; |
3c45ddf8 CL |
1066 | args.protocol = conn->cb_xprt->xpt_class->xcl_ident | |
1067 | XPRT_TRANSPORT_BC; | |
12fc3e92 | 1068 | args.authflavor = ses->se_cb_sec.flavor; |
3ddc8bf5 | 1069 | } |
ae5c7947 | 1070 | /* Create RPC client */ |
d50039ea | 1071 | client = rpc_create(&args); |
e1cab5a5 | 1072 | if (IS_ERR(client)) { |
1eace0d1 | 1073 | trace_nfsd_cb_setup_err(clp, PTR_ERR(client)); |
e1cab5a5 BF |
1074 | return PTR_ERR(client); |
1075 | } | |
c6bb3ca2 | 1076 | cred = get_backchannel_cred(clp, client, ses); |
1c3da445 | 1077 | if (!cred) { |
1eace0d1 | 1078 | trace_nfsd_cb_setup_err(clp, -ENOMEM); |
c6bb3ca2 | 1079 | rpc_shutdown_client(client); |
1c3da445 | 1080 | return -ENOMEM; |
c6bb3ca2 | 1081 | } |
3bc8edc9 DA |
1082 | |
1083 | if (clp->cl_minorversion != 0) | |
1084 | clp->cl_cb_conn.cb_xprt = conn->cb_xprt; | |
6ff8da08 | 1085 | clp->cl_cb_client = client; |
c6bb3ca2 | 1086 | clp->cl_cb_cred = cred; |
05570a2b | 1087 | rcu_read_lock(); |
3c92fba5 CL |
1088 | trace_nfsd_cb_setup(clp, rpc_peeraddr2str(client, RPC_DISPLAY_NETID), |
1089 | args.authflavor); | |
05570a2b | 1090 | rcu_read_unlock(); |
e1cab5a5 | 1091 | return 0; |
a601caed BF |
1092 | } |
1093 | ||
8476c69a CL |
1094 | static void nfsd4_mark_cb_state(struct nfs4_client *clp, int newstate) |
1095 | { | |
1096 | if (clp->cl_cb_state != newstate) { | |
1097 | clp->cl_cb_state = newstate; | |
a7cdf065 | 1098 | trace_nfsd_cb_new_state(clp); |
8476c69a CL |
1099 | } |
1100 | } | |
1101 | ||
627fb183 | 1102 | static void nfsd4_mark_cb_down(struct nfs4_client *clp) |
77a3569d | 1103 | { |
d4f72cb7 BF |
1104 | if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
1105 | return; | |
8476c69a | 1106 | nfsd4_mark_cb_state(clp, NFSD4_CB_DOWN); |
77a3569d BF |
1107 | } |
1108 | ||
627fb183 | 1109 | static void nfsd4_mark_cb_fault(struct nfs4_client *clp) |
5423732a | 1110 | { |
d4f72cb7 BF |
1111 | if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
1112 | return; | |
8476c69a | 1113 | nfsd4_mark_cb_state(clp, NFSD4_CB_FAULT); |
5423732a BH |
1114 | } |
1115 | ||
e300a63c BF |
1116 | static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) |
1117 | { | |
cee277d9 | 1118 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
e300a63c BF |
1119 | |
1120 | if (task->tk_status) | |
627fb183 | 1121 | nfsd4_mark_cb_down(clp); |
8476c69a CL |
1122 | else |
1123 | nfsd4_mark_cb_state(clp, NFSD4_CB_UP); | |
e300a63c BF |
1124 | } |
1125 | ||
2bbfed98 TM |
1126 | static void nfsd4_cb_probe_release(void *calldata) |
1127 | { | |
1128 | struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); | |
1129 | ||
1130 | nfsd41_cb_inflight_end(clp); | |
1131 | ||
1132 | } | |
1133 | ||
e300a63c | 1134 | static const struct rpc_call_ops nfsd4_cb_probe_ops = { |
cee277d9 BF |
1135 | /* XXX: release method to ensure we set the cb channel down if |
1136 | * necessary on early failure? */ | |
e300a63c | 1137 | .rpc_call_done = nfsd4_cb_probe_done, |
2bbfed98 | 1138 | .rpc_release = nfsd4_cb_probe_release, |
e300a63c BF |
1139 | }; |
1140 | ||
63c86716 | 1141 | /* |
5a3c9d71 BF |
1142 | * Poke the callback thread to process any updates to the callback |
1143 | * parameters, and send a null probe. | |
63c86716 | 1144 | */ |
5a3c9d71 BF |
1145 | void nfsd4_probe_callback(struct nfs4_client *clp) |
1146 | { | |
4ade892a | 1147 | trace_nfsd_cb_probe(clp); |
8476c69a | 1148 | nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN); |
a52d726b | 1149 | set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
f0b5de1b | 1150 | nfsd4_run_cb(&clp->cl_cb_null); |
5a3c9d71 BF |
1151 | } |
1152 | ||
84f5f7cc | 1153 | void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
63c86716 | 1154 | { |
84f5f7cc BF |
1155 | nfsd4_probe_callback(clp); |
1156 | flush_workqueue(callback_wq); | |
1157 | } | |
63c86716 | 1158 | |
5a3c9d71 | 1159 | void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
63c86716 | 1160 | { |
8476c69a | 1161 | nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN); |
6ff8da08 BF |
1162 | spin_lock(&clp->cl_lock); |
1163 | memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); | |
6ff8da08 | 1164 | spin_unlock(&clp->cl_lock); |
1da177e4 LT |
1165 | } |
1166 | ||
2a1d1b59 RL |
1167 | /* |
1168 | * There's currently a single callback channel slot. | |
1169 | * If the slot is available, then mark it busy. Otherwise, set the | |
1170 | * thread for sleeping on the callback RPC wait queue. | |
1171 | */ | |
12357f1b | 1172 | static bool nfsd41_cb_get_slot(struct nfsd4_callback *cb, struct rpc_task *task) |
2a1d1b59 | 1173 | { |
12357f1b TM |
1174 | struct nfs4_client *clp = cb->cb_clp; |
1175 | ||
1176 | if (!cb->cb_holds_slot && | |
1177 | test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
2a1d1b59 | 1178 | rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); |
c6c15e1e TM |
1179 | /* Race breaker */ |
1180 | if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { | |
1181 | dprintk("%s slot is busy\n", __func__); | |
1182 | return false; | |
1183 | } | |
1184 | rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); | |
2a1d1b59 | 1185 | } |
12357f1b | 1186 | cb->cb_holds_slot = true; |
3ff3600e | 1187 | return true; |
2a1d1b59 RL |
1188 | } |
1189 | ||
12357f1b TM |
1190 | static void nfsd41_cb_release_slot(struct nfsd4_callback *cb) |
1191 | { | |
1192 | struct nfs4_client *clp = cb->cb_clp; | |
1193 | ||
1194 | if (cb->cb_holds_slot) { | |
1195 | cb->cb_holds_slot = false; | |
1196 | clear_bit(0, &clp->cl_cb_slot_busy); | |
1197 | rpc_wake_up_next(&clp->cl_cb_waitq); | |
1198 | } | |
1199 | } | |
1200 | ||
2bbfed98 TM |
1201 | static void nfsd41_destroy_cb(struct nfsd4_callback *cb) |
1202 | { | |
1203 | struct nfs4_client *clp = cb->cb_clp; | |
1204 | ||
9a026aec | 1205 | trace_nfsd_cb_destroy(clp, cb); |
2bbfed98 TM |
1206 | nfsd41_cb_release_slot(cb); |
1207 | if (cb->cb_ops && cb->cb_ops->release) | |
1208 | cb->cb_ops->release(cb); | |
1209 | nfsd41_cb_inflight_end(clp); | |
1210 | } | |
1211 | ||
2a1d1b59 RL |
1212 | /* |
1213 | * TODO: cb_sequence should support referring call lists, cachethis, multiple | |
1214 | * slots, and mark callback channel down on communication errors. | |
1215 | */ | |
1216 | static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) | |
1217 | { | |
5878453d | 1218 | struct nfsd4_callback *cb = calldata; |
8be2d234 | 1219 | struct nfs4_client *clp = cb->cb_clp; |
8323c3b2 | 1220 | u32 minorversion = clp->cl_minorversion; |
2a1d1b59 | 1221 | |
7ba6cad6 KM |
1222 | /* |
1223 | * cb_seq_status is only set in decode_cb_sequence4res, | |
1224 | * and so will remain 1 if an rpc level failure occurs. | |
1225 | */ | |
1226 | cb->cb_seq_status = 1; | |
4399396e | 1227 | cb->cb_status = 0; |
12357f1b TM |
1228 | if (minorversion && !nfsd41_cb_get_slot(cb, task)) |
1229 | return; | |
2a1d1b59 RL |
1230 | rpc_call_start(task); |
1231 | } | |
1232 | ||
7ba6cad6 | 1233 | static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb) |
0421b5c5 | 1234 | { |
8be2d234 | 1235 | struct nfs4_client *clp = cb->cb_clp; |
7ba6cad6 KM |
1236 | struct nfsd4_session *session = clp->cl_cb_session; |
1237 | bool ret = true; | |
0421b5c5 | 1238 | |
7ba6cad6 KM |
1239 | if (!clp->cl_minorversion) { |
1240 | /* | |
1241 | * If the backchannel connection was shut down while this | |
1242 | * task was queued, we need to resubmit it after setting up | |
1243 | * a new backchannel connection. | |
1244 | * | |
1245 | * Note that if we lost our callback connection permanently | |
1246 | * the submission code will error out, so we don't need to | |
1247 | * handle that case here. | |
1248 | */ | |
ae67bd38 | 1249 | if (RPC_SIGNALLED(task)) |
7ba6cad6 KM |
1250 | goto need_restart; |
1251 | ||
1252 | return true; | |
1253 | } | |
0421b5c5 | 1254 | |
e6abc8ca TM |
1255 | if (!cb->cb_holds_slot) |
1256 | goto need_restart; | |
1257 | ||
8626664c CL |
1258 | /* This is the operation status code for CB_SEQUENCE */ |
1259 | trace_nfsd_cb_seq_status(task, cb); | |
7ba6cad6 KM |
1260 | switch (cb->cb_seq_status) { |
1261 | case 0: | |
276f03e3 KM |
1262 | /* |
1263 | * No need for lock, access serialized in nfsd4_cb_prepare | |
1264 | * | |
1265 | * RFC5661 20.9.3 | |
1266 | * If CB_SEQUENCE returns an error, then the state of the slot | |
1267 | * (sequence ID, cached reply) MUST NOT change. | |
1268 | */ | |
7ba6cad6 KM |
1269 | ++session->se_cb_seq_nr; |
1270 | break; | |
1271 | case -ESERVERFAULT: | |
1272 | ++session->se_cb_seq_nr; | |
627fb183 | 1273 | nfsd4_mark_cb_fault(cb->cb_clp); |
43b02dba CL |
1274 | ret = false; |
1275 | break; | |
7ba6cad6 | 1276 | case 1: |
43b02dba CL |
1277 | /* |
1278 | * cb_seq_status remains 1 if an RPC Reply was never | |
1279 | * received. NFSD can't know if the client processed | |
1280 | * the CB_SEQUENCE operation. Ask the client to send a | |
1281 | * DESTROY_SESSION to recover. | |
1282 | */ | |
1283 | fallthrough; | |
7ba6cad6 | 1284 | case -NFS4ERR_BADSESSION: |
627fb183 | 1285 | nfsd4_mark_cb_fault(cb->cb_clp); |
7ba6cad6 | 1286 | ret = false; |
43b02dba | 1287 | goto need_restart; |
7ba6cad6 | 1288 | case -NFS4ERR_DELAY: |
961b4b5e | 1289 | cb->cb_seq_status = 1; |
7ba6cad6 KM |
1290 | if (!rpc_restart_call(task)) |
1291 | goto out; | |
1292 | ||
1293 | rpc_delay(task, 2 * HZ); | |
1294 | return false; | |
1295 | case -NFS4ERR_BADSLOT: | |
1296 | goto retry_nowait; | |
1297 | case -NFS4ERR_SEQ_MISORDERED: | |
1298 | if (session->se_cb_seq_nr != 1) { | |
1299 | session->se_cb_seq_nr = 1; | |
1300 | goto retry_nowait; | |
1301 | } | |
1302 | break; | |
1303 | default: | |
627fb183 | 1304 | nfsd4_mark_cb_fault(cb->cb_clp); |
0421b5c5 | 1305 | } |
12357f1b | 1306 | nfsd41_cb_release_slot(cb); |
8626664c CL |
1307 | |
1308 | trace_nfsd_cb_free_slot(task, cb); | |
7ba6cad6 | 1309 | |
ae67bd38 | 1310 | if (RPC_SIGNALLED(task)) |
7ba6cad6 KM |
1311 | goto need_restart; |
1312 | out: | |
1313 | return ret; | |
1314 | retry_nowait: | |
1315 | if (rpc_restart_call_prepare(task)) | |
1316 | ret = false; | |
1317 | goto out; | |
1318 | need_restart: | |
2bbfed98 | 1319 | if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) { |
9a026aec | 1320 | trace_nfsd_cb_restart(clp, cb); |
2bbfed98 TM |
1321 | task->tk_status = 0; |
1322 | cb->cb_need_restart = true; | |
1323 | } | |
7ba6cad6 KM |
1324 | return false; |
1325 | } | |
1326 | ||
1327 | static void nfsd4_cb_done(struct rpc_task *task, void *calldata) | |
1328 | { | |
1329 | struct nfsd4_callback *cb = calldata; | |
1330 | struct nfs4_client *clp = cb->cb_clp; | |
1331 | ||
7ba6cad6 | 1332 | if (!nfsd4_cb_sequence_done(task, cb)) |
4b21d0de | 1333 | return; |
4b21d0de | 1334 | |
ef2a1b3e CH |
1335 | if (cb->cb_status) { |
1336 | WARN_ON_ONCE(task->tk_status); | |
1337 | task->tk_status = cb->cb_status; | |
1338 | } | |
1339 | ||
0162ac2b | 1340 | switch (cb->cb_ops->done(cb, task)) { |
172c85dd | 1341 | case 0: |
0162ac2b CH |
1342 | task->tk_status = 0; |
1343 | rpc_restart_call_prepare(task); | |
1344 | return; | |
1345 | case 1: | |
1c73b9d2 SM |
1346 | switch (task->tk_status) { |
1347 | case -EIO: | |
1348 | case -ETIMEDOUT: | |
b4250dd8 | 1349 | case -EACCES: |
627fb183 | 1350 | nfsd4_mark_cb_down(clp); |
1c73b9d2 | 1351 | } |
0162ac2b CH |
1352 | break; |
1353 | default: | |
1354 | BUG(); | |
63e4863f | 1355 | } |
63e4863f BF |
1356 | } |
1357 | ||
0162ac2b | 1358 | static void nfsd4_cb_release(void *calldata) |
63e4863f | 1359 | { |
5878453d | 1360 | struct nfsd4_callback *cb = calldata; |
0162ac2b | 1361 | |
cba5f62b | 1362 | if (cb->cb_need_restart) |
2bbfed98 | 1363 | nfsd4_queue_cb(cb); |
cba5f62b | 1364 | else |
2bbfed98 | 1365 | nfsd41_destroy_cb(cb); |
cba5f62b | 1366 | |
63e4863f BF |
1367 | } |
1368 | ||
0162ac2b | 1369 | static const struct rpc_call_ops nfsd4_cb_ops = { |
2a1d1b59 | 1370 | .rpc_call_prepare = nfsd4_cb_prepare, |
0162ac2b CH |
1371 | .rpc_call_done = nfsd4_cb_done, |
1372 | .rpc_release = nfsd4_cb_release, | |
63e4863f BF |
1373 | }; |
1374 | ||
b5a1a81e BF |
1375 | int nfsd4_create_callback_queue(void) |
1376 | { | |
88382036 | 1377 | callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0); |
b5a1a81e BF |
1378 | if (!callback_wq) |
1379 | return -ENOMEM; | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | void nfsd4_destroy_callback_queue(void) | |
1384 | { | |
1385 | destroy_workqueue(callback_wq); | |
1386 | } | |
1387 | ||
ab707e15 | 1388 | /* must be called under the state lock */ |
6ff8da08 | 1389 | void nfsd4_shutdown_callback(struct nfs4_client *clp) |
b5a1a81e | 1390 | { |
b200f0e3 CL |
1391 | if (clp->cl_cb_state != NFSD4_CB_UNKNOWN) |
1392 | trace_nfsd_cb_shutdown(clp); | |
1393 | ||
a52d726b | 1394 | set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
b5a1a81e | 1395 | /* |
6ff8da08 | 1396 | * Note this won't actually result in a null callback; |
02e1215f | 1397 | * instead, nfsd4_run_cb_null() will detect the killed |
6ff8da08 | 1398 | * client, destroy the rpc client, and stop: |
b5a1a81e | 1399 | */ |
f0b5de1b | 1400 | nfsd4_run_cb(&clp->cl_cb_null); |
b5a1a81e | 1401 | flush_workqueue(callback_wq); |
2bbfed98 | 1402 | nfsd41_cb_inflight_wait_complete(clp); |
b5a1a81e BF |
1403 | } |
1404 | ||
dcbeaa68 BF |
1405 | static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) |
1406 | { | |
1407 | struct nfsd4_session *s; | |
1408 | struct nfsd4_conn *c; | |
1409 | ||
112bdd59 CL |
1410 | lockdep_assert_held(&clp->cl_lock); |
1411 | ||
dcbeaa68 BF |
1412 | list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { |
1413 | list_for_each_entry(c, &s->se_conns, cn_persession) { | |
1414 | if (c->cn_flags & NFS4_CDFC4_BACK) | |
1415 | return c; | |
1416 | } | |
1417 | } | |
1418 | return NULL; | |
1419 | } | |
1420 | ||
cc1ce2f1 BF |
1421 | /* |
1422 | * Note there isn't a lot of locking in this code; instead we depend on | |
1423 | * the fact that it is run from the callback_wq, which won't run two | |
1424 | * work items at once. So, for example, callback_wq handles all access | |
1425 | * of cl_cb_client and all calls to rpc_create or rpc_shutdown_client. | |
1426 | */ | |
65e4c894 | 1427 | static void nfsd4_process_cb_update(struct nfsd4_callback *cb) |
6ff8da08 BF |
1428 | { |
1429 | struct nfs4_cb_conn conn; | |
1430 | struct nfs4_client *clp = cb->cb_clp; | |
dcbeaa68 BF |
1431 | struct nfsd4_session *ses = NULL; |
1432 | struct nfsd4_conn *c; | |
6ff8da08 BF |
1433 | int err; |
1434 | ||
9a026aec CL |
1435 | trace_nfsd_cb_bc_update(clp, cb); |
1436 | ||
6ff8da08 BF |
1437 | /* |
1438 | * This is either an update, or the client dying; in either case, | |
1439 | * kill the old client: | |
1440 | */ | |
1441 | if (clp->cl_cb_client) { | |
9a026aec | 1442 | trace_nfsd_cb_bc_shutdown(clp, cb); |
6ff8da08 BF |
1443 | rpc_shutdown_client(clp->cl_cb_client); |
1444 | clp->cl_cb_client = NULL; | |
a52458b4 | 1445 | put_cred(clp->cl_cb_cred); |
c6bb3ca2 | 1446 | clp->cl_cb_cred = NULL; |
6ff8da08 | 1447 | } |
dcbeaa68 BF |
1448 | if (clp->cl_cb_conn.cb_xprt) { |
1449 | svc_xprt_put(clp->cl_cb_conn.cb_xprt); | |
1450 | clp->cl_cb_conn.cb_xprt = NULL; | |
1451 | } | |
a52d726b | 1452 | if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) |
6ff8da08 | 1453 | return; |
9a026aec | 1454 | |
6ff8da08 BF |
1455 | spin_lock(&clp->cl_lock); |
1456 | /* | |
1457 | * Only serialized callback code is allowed to clear these | |
1458 | * flags; main nfsd code can only set them: | |
1459 | */ | |
84ebf02d | 1460 | WARN_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); |
a52d726b | 1461 | clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
84ebf02d | 1462 | |
6ff8da08 | 1463 | memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); |
dcbeaa68 BF |
1464 | c = __nfsd4_find_backchannel(clp); |
1465 | if (c) { | |
1466 | svc_xprt_get(c->cn_xprt); | |
1467 | conn.cb_xprt = c->cn_xprt; | |
1468 | ses = c->cn_session; | |
1469 | } | |
6ff8da08 BF |
1470 | spin_unlock(&clp->cl_lock); |
1471 | ||
dcbeaa68 | 1472 | err = setup_callback_client(clp, &conn, ses); |
5ce8ba25 | 1473 | if (err) { |
627fb183 | 1474 | nfsd4_mark_cb_down(clp); |
a4abc6b1 XY |
1475 | if (c) |
1476 | svc_xprt_put(c->cn_xprt); | |
5ce8ba25 BF |
1477 | return; |
1478 | } | |
6ff8da08 BF |
1479 | } |
1480 | ||
02e1215f | 1481 | static void |
0162ac2b | 1482 | nfsd4_run_cb_work(struct work_struct *work) |
5878453d | 1483 | { |
0162ac2b | 1484 | struct nfsd4_callback *cb = |
fe0e9580 | 1485 | container_of(work, struct nfsd4_callback, cb_work.work); |
fb003923 | 1486 | struct nfs4_client *clp = cb->cb_clp; |
6ff8da08 | 1487 | struct rpc_clnt *clnt; |
6221f1d9 | 1488 | int flags; |
1da177e4 | 1489 | |
a7cdf065 CL |
1490 | trace_nfsd_cb_start(clp); |
1491 | ||
a52d726b | 1492 | if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) |
6ff8da08 BF |
1493 | nfsd4_process_cb_update(cb); |
1494 | ||
1495 | clnt = clp->cl_cb_client; | |
1496 | if (!clnt) { | |
9c8ecb93 CL |
1497 | /* Callback channel broken, or client killed; give up: */ |
1498 | nfsd41_destroy_cb(cb); | |
6ff8da08 | 1499 | return; |
ac94bf58 | 1500 | } |
4bd9e9b7 CH |
1501 | |
1502 | /* | |
1503 | * Don't send probe messages for 4.1 or later. | |
1504 | */ | |
1505 | if (!cb->cb_ops && clp->cl_minorversion) { | |
8476c69a | 1506 | nfsd4_mark_cb_state(clp, NFSD4_CB_UP); |
2bbfed98 | 1507 | nfsd41_destroy_cb(cb); |
4bd9e9b7 CH |
1508 | return; |
1509 | } | |
1510 | ||
c1ccfcf1 CL |
1511 | if (cb->cb_need_restart) { |
1512 | cb->cb_need_restart = false; | |
1513 | } else { | |
1514 | if (cb->cb_ops && cb->cb_ops->prepare) | |
1515 | cb->cb_ops->prepare(cb); | |
1516 | } | |
c6bb3ca2 | 1517 | cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
6221f1d9 CL |
1518 | flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN; |
1519 | rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags, | |
0162ac2b | 1520 | cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); |
02e1215f JL |
1521 | } |
1522 | ||
f0b5de1b | 1523 | void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, |
c4cb8974 | 1524 | const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) |
b5a1a81e | 1525 | { |
5ce8ba25 | 1526 | cb->cb_clp = clp; |
326129d0 | 1527 | cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; |
fb003923 BF |
1528 | cb->cb_msg.rpc_argp = cb; |
1529 | cb->cb_msg.rpc_resp = cb; | |
0162ac2b | 1530 | cb->cb_ops = ops; |
fe0e9580 | 1531 | INIT_DELAYED_WORK(&cb->cb_work, nfsd4_run_cb_work); |
ef2a1b3e | 1532 | cb->cb_status = 0; |
cba5f62b | 1533 | cb->cb_need_restart = false; |
e6abc8ca | 1534 | cb->cb_holds_slot = false; |
f0b5de1b | 1535 | } |
5ce8ba25 | 1536 | |
b95239ca JL |
1537 | /** |
1538 | * nfsd4_run_cb - queue up a callback job to run | |
1539 | * @cb: callback to queue | |
1540 | * | |
1541 | * Kick off a callback to do its thing. Returns false if it was already | |
1542 | * on a queue, true otherwise. | |
1543 | */ | |
1544 | bool nfsd4_run_cb(struct nfsd4_callback *cb) | |
f0b5de1b | 1545 | { |
2bbfed98 | 1546 | struct nfs4_client *clp = cb->cb_clp; |
b95239ca | 1547 | bool queued; |
2bbfed98 TM |
1548 | |
1549 | nfsd41_cb_inflight_begin(clp); | |
b95239ca JL |
1550 | queued = nfsd4_queue_cb(cb); |
1551 | if (!queued) | |
2bbfed98 | 1552 | nfsd41_cb_inflight_end(clp); |
b95239ca | 1553 | return queued; |
b5a1a81e | 1554 | } |