blob: e0be57b0f79bb8027bc888da08e2c821b1426d85 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/sunrpc/clnt.h>
Kinglong Meed531c002014-03-24 11:59:46 +080035#include <linux/sunrpc/xprt.h>
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -050036#include <linux/sunrpc/svc_xprt.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Boaz Harrosh9a74af22009-12-03 20:30:56 +020038#include "nfsd.h"
39#include "state.h"
Stanislav Kinsbursky3d733712012-11-27 14:11:44 +030040#include "netns.h"
J. Bruce Fields06b332a2013-04-09 11:34:36 -040041#include "xdr4cb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#define NFSDDBG_FACILITY NFSDDBG_PROC
44
Benny Halevy54237322011-10-19 19:12:58 -070045static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define NFSPROC4_CB_NULL 0
48#define NFSPROC4_CB_COMPOUND 1
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050/* Index of predefined Linux callback client operations */
51
52enum {
Benny Halevy4be36ca2009-09-10 12:25:46 +030053 NFSPROC4_CLNT_CB_NULL = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 NFSPROC4_CLNT_CB_RECALL,
Andy Adamson38524ab2009-09-10 12:25:59 +030055 NFSPROC4_CLNT_CB_SEQUENCE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070056};
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058struct nfs4_cb_compound_hdr {
Andy Adamson38524ab2009-09-10 12:25:59 +030059 /* args */
60 u32 ident; /* minorversion 0 only */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 u32 nops;
Andy Adamsonef52bff2009-06-16 04:20:50 +030062 __be32 *nops_p;
Andy Adamsonab52ae62009-06-16 04:20:53 +030063 u32 minorversion;
Andy Adamson38524ab2009-09-10 12:25:59 +030064 /* res */
65 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
Chuck Lever85a56482010-12-14 14:57:32 +000068/*
69 * Handle decode buffer overflows out-of-line.
70 */
71static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
Chuck Lever85a56482010-12-14 14:57:32 +000073 dprintk("NFS: %s prematurely hit the end of our receive buffer. "
74 "Remaining buffer length is %tu words.\n",
75 func, xdr->end - xdr->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Chuck Levera033db42010-12-14 14:57:22 +000078static __be32 *xdr_encode_empty_array(__be32 *p)
79{
80 *p++ = xdr_zero;
81 return p;
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/*
Chuck Levera033db42010-12-14 14:57:22 +000085 * Encode/decode NFSv4 CB basic data types
86 *
87 * Basic NFSv4 callback data types are defined in section 15 of RFC
88 * 3530: "Network File System (NFS) version 4 Protocol" and section
89 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
90 * 1 Protocol"
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 */
92
Chuck Levera033db42010-12-14 14:57:22 +000093/*
94 * nfs_cb_opnum4
95 *
96 * enum nfs_cb_opnum4 {
97 * OP_CB_GETATTR = 3,
98 * ...
99 * };
100 */
101enum nfs_cb_opnum4 {
102 OP_CB_GETATTR = 3,
103 OP_CB_RECALL = 4,
104 OP_CB_LAYOUTRECALL = 5,
105 OP_CB_NOTIFY = 6,
106 OP_CB_PUSH_DELEG = 7,
107 OP_CB_RECALL_ANY = 8,
108 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
109 OP_CB_RECALL_SLOT = 10,
110 OP_CB_SEQUENCE = 11,
111 OP_CB_WANTS_CANCELLED = 12,
112 OP_CB_NOTIFY_LOCK = 13,
113 OP_CB_NOTIFY_DEVICEID = 14,
114 OP_CB_ILLEGAL = 10044
115};
116
117static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
Benny Halevy9303bbd2010-05-25 09:50:23 +0300118{
119 __be32 *p;
120
Chuck Levera033db42010-12-14 14:57:22 +0000121 p = xdr_reserve_space(xdr, 4);
122 *p = cpu_to_be32(op);
Benny Halevy9303bbd2010-05-25 09:50:23 +0300123}
124
Chuck Levera033db42010-12-14 14:57:22 +0000125/*
126 * nfs_fh4
127 *
128 * typedef opaque nfs_fh4<NFS4_FHSIZE>;
129 */
130static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
131{
132 u32 length = fh->fh_size;
133 __be32 *p;
134
135 BUG_ON(length > NFS4_FHSIZE);
136 p = xdr_reserve_space(xdr, 4 + length);
137 xdr_encode_opaque(p, &fh->fh_base, length);
138}
139
140/*
141 * stateid4
142 *
143 * struct stateid4 {
144 * uint32_t seqid;
145 * opaque other[12];
146 * };
147 */
148static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
149{
150 __be32 *p;
151
152 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
153 *p++ = cpu_to_be32(sid->si_generation);
154 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
155}
156
157/*
158 * sessionid4
159 *
160 * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
161 */
162static void encode_sessionid4(struct xdr_stream *xdr,
163 const struct nfsd4_session *session)
164{
165 __be32 *p;
166
167 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
168 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
169 NFS4_MAX_SESSIONID_LEN);
170}
171
172/*
Chuck Lever85a56482010-12-14 14:57:32 +0000173 * nfsstat4
174 */
175static const struct {
176 int stat;
177 int errno;
178} nfs_cb_errtbl[] = {
179 { NFS4_OK, 0 },
180 { NFS4ERR_PERM, -EPERM },
181 { NFS4ERR_NOENT, -ENOENT },
182 { NFS4ERR_IO, -EIO },
183 { NFS4ERR_NXIO, -ENXIO },
184 { NFS4ERR_ACCESS, -EACCES },
185 { NFS4ERR_EXIST, -EEXIST },
186 { NFS4ERR_XDEV, -EXDEV },
187 { NFS4ERR_NOTDIR, -ENOTDIR },
188 { NFS4ERR_ISDIR, -EISDIR },
189 { NFS4ERR_INVAL, -EINVAL },
190 { NFS4ERR_FBIG, -EFBIG },
191 { NFS4ERR_NOSPC, -ENOSPC },
192 { NFS4ERR_ROFS, -EROFS },
193 { NFS4ERR_MLINK, -EMLINK },
194 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
195 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
196 { NFS4ERR_DQUOT, -EDQUOT },
197 { NFS4ERR_STALE, -ESTALE },
198 { NFS4ERR_BADHANDLE, -EBADHANDLE },
199 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
200 { NFS4ERR_NOTSUPP, -ENOTSUPP },
201 { NFS4ERR_TOOSMALL, -ETOOSMALL },
202 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
203 { NFS4ERR_BADTYPE, -EBADTYPE },
204 { NFS4ERR_LOCKED, -EAGAIN },
205 { NFS4ERR_RESOURCE, -EREMOTEIO },
206 { NFS4ERR_SYMLINK, -ELOOP },
207 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
208 { NFS4ERR_DEADLOCK, -EDEADLK },
209 { -1, -EIO }
210};
211
212/*
213 * If we cannot translate the error, the recovery routines should
214 * handle it.
215 *
216 * Note: remaining NFSv4 error codes have values > 10000, so should
217 * not conflict with native Linux error codes.
218 */
219static int nfs_cb_stat_to_errno(int status)
220{
221 int i;
222
223 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
224 if (nfs_cb_errtbl[i].stat == status)
225 return nfs_cb_errtbl[i].errno;
226 }
227
228 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
229 return -status;
230}
231
232static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
233 enum nfsstat4 *status)
234{
235 __be32 *p;
236 u32 op;
237
238 p = xdr_inline_decode(xdr, 4 + 4);
239 if (unlikely(p == NULL))
240 goto out_overflow;
241 op = be32_to_cpup(p++);
242 if (unlikely(op != expected))
243 goto out_unexpected;
244 *status = be32_to_cpup(p);
245 return 0;
246out_overflow:
247 print_overflow_msg(__func__, xdr);
248 return -EIO;
249out_unexpected:
250 dprintk("NFSD: Callback server returned operation %d but "
251 "we issued a request for %d\n", op, expected);
252 return -EIO;
253}
254
255/*
Chuck Levera033db42010-12-14 14:57:22 +0000256 * CB_COMPOUND4args
257 *
258 * struct CB_COMPOUND4args {
259 * utf8str_cs tag;
260 * uint32_t minorversion;
261 * uint32_t callback_ident;
262 * nfs_cb_argop4 argarray<>;
263 * };
264*/
265static void encode_cb_compound4args(struct xdr_stream *xdr,
266 struct nfs4_cb_compound_hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Al Virof00f3282006-10-19 23:29:01 -0700268 __be32 * p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Chuck Levera033db42010-12-14 14:57:22 +0000270 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
271 p = xdr_encode_empty_array(p); /* empty tag */
272 *p++ = cpu_to_be32(hdr->minorversion);
273 *p++ = cpu_to_be32(hdr->ident);
274
Andy Adamsonef52bff2009-06-16 04:20:50 +0300275 hdr->nops_p = p;
Chuck Levera033db42010-12-14 14:57:22 +0000276 *p = cpu_to_be32(hdr->nops); /* argarray element count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277}
278
Chuck Levera033db42010-12-14 14:57:22 +0000279/*
280 * Update argarray element count
281 */
Andy Adamsonef52bff2009-06-16 04:20:50 +0300282static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
283{
Chuck Levera033db42010-12-14 14:57:22 +0000284 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
285 *hdr->nops_p = cpu_to_be32(hdr->nops);
Andy Adamsonef52bff2009-06-16 04:20:50 +0300286}
287
Chuck Levera033db42010-12-14 14:57:22 +0000288/*
Chuck Lever85a56482010-12-14 14:57:32 +0000289 * CB_COMPOUND4res
290 *
291 * struct CB_COMPOUND4res {
292 * nfsstat4 status;
293 * utf8str_cs tag;
294 * nfs_cb_resop4 resarray<>;
295 * };
296 */
297static int decode_cb_compound4res(struct xdr_stream *xdr,
298 struct nfs4_cb_compound_hdr *hdr)
299{
300 u32 length;
301 __be32 *p;
302
303 p = xdr_inline_decode(xdr, 4 + 4);
304 if (unlikely(p == NULL))
305 goto out_overflow;
306 hdr->status = be32_to_cpup(p++);
307 /* Ignore the tag */
308 length = be32_to_cpup(p++);
309 p = xdr_inline_decode(xdr, length + 4);
310 if (unlikely(p == NULL))
311 goto out_overflow;
312 hdr->nops = be32_to_cpup(p);
313 return 0;
314out_overflow:
315 print_overflow_msg(__func__, xdr);
316 return -EIO;
317}
318
319/*
Chuck Levera033db42010-12-14 14:57:22 +0000320 * CB_RECALL4args
321 *
322 * struct CB_RECALL4args {
323 * stateid4 stateid;
324 * bool truncate;
325 * nfs_fh4 fh;
326 * };
327 */
328static void encode_cb_recall4args(struct xdr_stream *xdr,
329 const struct nfs4_delegation *dp,
330 struct nfs4_cb_compound_hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
Al Virof00f3282006-10-19 23:29:01 -0700332 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Chuck Levera033db42010-12-14 14:57:22 +0000334 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
J. Bruce Fieldsd5477a82011-09-08 12:07:44 -0400335 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
Chuck Levera033db42010-12-14 14:57:22 +0000336
337 p = xdr_reserve_space(xdr, 4);
338 *p++ = xdr_zero; /* truncate */
339
Trond Myklebust11b91642014-07-29 21:34:08 -0400340 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
Chuck Levera033db42010-12-14 14:57:22 +0000341
Andy Adamsonef52bff2009-06-16 04:20:50 +0300342 hdr->nops++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343}
344
Chuck Levera033db42010-12-14 14:57:22 +0000345/*
346 * CB_SEQUENCE4args
347 *
348 * struct CB_SEQUENCE4args {
349 * sessionid4 csa_sessionid;
350 * sequenceid4 csa_sequenceid;
351 * slotid4 csa_slotid;
352 * slotid4 csa_highest_slotid;
353 * bool csa_cachethis;
354 * referring_call_list4 csa_referring_call_lists<>;
355 * };
356 */
357static void encode_cb_sequence4args(struct xdr_stream *xdr,
358 const struct nfsd4_callback *cb,
359 struct nfs4_cb_compound_hdr *hdr)
Benny Halevy2af73582009-09-10 12:26:51 +0300360{
Chuck Levera033db42010-12-14 14:57:22 +0000361 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
Benny Halevy2af73582009-09-10 12:26:51 +0300362 __be32 *p;
363
364 if (hdr->minorversion == 0)
365 return;
366
Chuck Levera033db42010-12-14 14:57:22 +0000367 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
368 encode_sessionid4(xdr, session);
Benny Halevy2af73582009-09-10 12:26:51 +0300369
Chuck Levera033db42010-12-14 14:57:22 +0000370 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
371 *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
372 *p++ = xdr_zero; /* csa_slotid */
373 *p++ = xdr_zero; /* csa_highest_slotid */
374 *p++ = xdr_zero; /* csa_cachethis */
375 xdr_encode_empty_array(p); /* csa_referring_call_lists */
376
Benny Halevy2af73582009-09-10 12:26:51 +0300377 hdr->nops++;
378}
379
Chuck Levera033db42010-12-14 14:57:22 +0000380/*
Chuck Lever85a56482010-12-14 14:57:32 +0000381 * CB_SEQUENCE4resok
382 *
383 * struct CB_SEQUENCE4resok {
384 * sessionid4 csr_sessionid;
385 * sequenceid4 csr_sequenceid;
386 * slotid4 csr_slotid;
387 * slotid4 csr_highest_slotid;
388 * slotid4 csr_target_highest_slotid;
389 * };
390 *
391 * union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
392 * case NFS4_OK:
393 * CB_SEQUENCE4resok csr_resok4;
394 * default:
395 * void;
396 * };
397 *
398 * Our current back channel implmentation supports a single backchannel
399 * with a single slot.
400 */
401static int decode_cb_sequence4resok(struct xdr_stream *xdr,
402 struct nfsd4_callback *cb)
403{
404 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
405 struct nfs4_sessionid id;
406 int status;
407 __be32 *p;
408 u32 dummy;
409
410 status = -ESERVERFAULT;
411
412 /*
413 * If the server returns different values for sessionID, slotID or
414 * sequence number, the server is looney tunes.
415 */
Benny Halevy2c9c8f32011-02-22 14:43:22 -0800416 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
Chuck Lever85a56482010-12-14 14:57:32 +0000417 if (unlikely(p == NULL))
418 goto out_overflow;
419 memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
420 if (memcmp(id.data, session->se_sessionid.data,
421 NFS4_MAX_SESSIONID_LEN) != 0) {
422 dprintk("NFS: %s Invalid session id\n", __func__);
423 goto out;
424 }
425 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
426
427 dummy = be32_to_cpup(p++);
428 if (dummy != session->se_cb_seq_nr) {
429 dprintk("NFS: %s Invalid sequence number\n", __func__);
430 goto out;
431 }
432
433 dummy = be32_to_cpup(p++);
434 if (dummy != 0) {
435 dprintk("NFS: %s Invalid slotid\n", __func__);
436 goto out;
437 }
438
439 /*
440 * FIXME: process highest slotid and target highest slotid
441 */
442 status = 0;
443out:
Benny Halevy54237322011-10-19 19:12:58 -0700444 if (status)
445 nfsd4_mark_cb_fault(cb->cb_clp, status);
Chuck Lever85a56482010-12-14 14:57:32 +0000446 return status;
447out_overflow:
448 print_overflow_msg(__func__, xdr);
449 return -EIO;
450}
451
452static int decode_cb_sequence4res(struct xdr_stream *xdr,
453 struct nfsd4_callback *cb)
454{
455 enum nfsstat4 nfserr;
456 int status;
457
458 if (cb->cb_minorversion == 0)
459 return 0;
460
461 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr);
462 if (unlikely(status))
463 goto out;
464 if (unlikely(nfserr != NFS4_OK))
465 goto out_default;
466 status = decode_cb_sequence4resok(xdr, cb);
467out:
468 return status;
469out_default:
Benny Halevy0af3f812011-01-13 11:25:31 +0200470 return nfs_cb_stat_to_errno(nfserr);
Chuck Lever85a56482010-12-14 14:57:32 +0000471}
472
473/*
Chuck Levera033db42010-12-14 14:57:22 +0000474 * NFSv4.0 and NFSv4.1 XDR encode functions
475 *
476 * NFSv4.0 callback argument types are defined in section 15 of RFC
477 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
478 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
479 * Protocol".
480 */
481
482/*
483 * NB: Without this zero space reservation, callbacks over krb5p fail
484 */
Chuck Lever9f06c712010-12-14 14:59:18 +0000485static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
486 void *__unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487{
Chuck Levera033db42010-12-14 14:57:22 +0000488 xdr_reserve_space(xdr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}
490
Chuck Levera033db42010-12-14 14:57:22 +0000491/*
492 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
493 */
Chuck Lever9f06c712010-12-14 14:59:18 +0000494static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
495 const struct nfsd4_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
Chuck Levera033db42010-12-14 14:57:22 +0000497 const struct nfs4_delegation *args = cb->cb_op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 struct nfs4_cb_compound_hdr hdr = {
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400499 .ident = cb->cb_clp->cl_cb_ident,
J. Bruce Fieldsfb003922010-05-31 18:21:37 -0400500 .minorversion = cb->cb_minorversion,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 };
502
Chuck Lever9f06c712010-12-14 14:59:18 +0000503 encode_cb_compound4args(xdr, &hdr);
504 encode_cb_sequence4args(xdr, cb, &hdr);
505 encode_cb_recall4args(xdr, args, &hdr);
Andy Adamsonef52bff2009-06-16 04:20:50 +0300506 encode_cb_nops(&hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
509
Chuck Lever85a56482010-12-14 14:57:32 +0000510/*
511 * NFSv4.0 and NFSv4.1 XDR decode functions
512 *
513 * NFSv4.0 callback result types are defined in section 15 of RFC
514 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
515 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
516 * Protocol".
517 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Chuck Leverbf269552010-12-14 14:59:29 +0000519static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
520 void *__unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 return 0;
523}
524
Benny Halevy2af73582009-09-10 12:26:51 +0300525/*
Chuck Lever85a56482010-12-14 14:57:32 +0000526 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
Benny Halevy2af73582009-09-10 12:26:51 +0300527 */
Chuck Leverbf269552010-12-14 14:59:29 +0000528static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
529 struct xdr_stream *xdr,
Chuck Lever85a56482010-12-14 14:57:32 +0000530 struct nfsd4_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 struct nfs4_cb_compound_hdr hdr;
Chuck Lever85a56482010-12-14 14:57:32 +0000533 enum nfsstat4 nfserr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 int status;
535
Chuck Leverbf269552010-12-14 14:59:29 +0000536 status = decode_cb_compound4res(xdr, &hdr);
Chuck Lever85a56482010-12-14 14:57:32 +0000537 if (unlikely(status))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 goto out;
Chuck Lever85a56482010-12-14 14:57:32 +0000539
540 if (cb != NULL) {
Chuck Leverbf269552010-12-14 14:59:29 +0000541 status = decode_cb_sequence4res(xdr, cb);
Chuck Lever85a56482010-12-14 14:57:32 +0000542 if (unlikely(status))
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300543 goto out;
544 }
Chuck Lever85a56482010-12-14 14:57:32 +0000545
Chuck Leverbf269552010-12-14 14:59:29 +0000546 status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr);
Chuck Lever85a56482010-12-14 14:57:32 +0000547 if (unlikely(status))
548 goto out;
549 if (unlikely(nfserr != NFS4_OK))
Benny Halevy0af3f812011-01-13 11:25:31 +0200550 status = nfs_cb_stat_to_errno(nfserr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551out:
552 return status;
553}
554
555/*
556 * RPC procedure tables
557 */
Chuck Lever7d93bd712010-12-14 14:57:42 +0000558#define PROC(proc, call, argtype, restype) \
559[NFSPROC4_CLNT_##proc] = { \
560 .p_proc = NFSPROC4_CB_##call, \
Chuck Lever9f06c712010-12-14 14:59:18 +0000561 .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \
Chuck Leverbf269552010-12-14 14:59:29 +0000562 .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \
Chuck Lever7d93bd712010-12-14 14:57:42 +0000563 .p_arglen = NFS4_enc_##argtype##_sz, \
564 .p_replen = NFS4_dec_##restype##_sz, \
565 .p_statidx = NFSPROC4_CB_##call, \
566 .p_name = #proc, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Chuck Lever7d93bd712010-12-14 14:57:42 +0000569static struct rpc_procinfo nfs4_cb_procedures[] = {
570 PROC(CB_NULL, NULL, cb_null, cb_null),
571 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572};
573
Chuck Lever7d93bd712010-12-14 14:57:42 +0000574static struct rpc_version nfs_cb_version4 = {
J. Bruce Fieldsb7299f42010-05-14 17:57:35 -0400575/*
576 * Note on the callback rpc program version number: despite language in rfc
577 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
578 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
579 * in practice that appears to be what implementations use. The section
580 * 18.36.3 language is expected to be fixed in an erratum.
581 */
Chuck Lever7d93bd712010-12-14 14:57:42 +0000582 .number = 1,
583 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
584 .procs = nfs4_cb_procedures
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585};
586
Trond Myklebusta613fa12012-01-20 13:53:56 -0500587static const struct rpc_version *nfs_cb_version[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 &nfs_cb_version4,
589};
590
Trond Myklebusta613fa12012-01-20 13:53:56 -0500591static const struct rpc_program cb_program;
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400592
593static struct rpc_stat cb_stats = {
Chuck Lever7d93bd712010-12-14 14:57:42 +0000594 .program = &cb_program
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400595};
596
597#define NFS4_CALLBACK 0x40000000
Trond Myklebusta613fa12012-01-20 13:53:56 -0500598static const struct rpc_program cb_program = {
Chuck Lever7d93bd712010-12-14 14:57:42 +0000599 .name = "nfs4_cb",
600 .number = NFS4_CALLBACK,
601 .nrvers = ARRAY_SIZE(nfs_cb_version),
602 .version = nfs_cb_version,
603 .stats = &cb_stats,
Stanislav Kinsbursky0157d022012-01-11 19:18:01 +0400604 .pipe_dir_name = "nfsd4_cb",
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400605};
606
Stanislav Kinsbursky3d733712012-11-27 14:11:44 +0300607static int max_cb_time(struct net *net)
J. Bruce Fields595947a2009-03-05 17:18:10 -0500608{
Stanislav Kinsbursky3d733712012-11-27 14:11:44 +0300609 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
610 return max(nn->nfsd4_lease/10, (time_t)1) * HZ;
J. Bruce Fields595947a2009-03-05 17:18:10 -0500611}
612
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400613static struct rpc_cred *callback_cred;
614
615int set_callback_cred(void)
616{
617 if (callback_cred)
618 return 0;
619 callback_cred = rpc_lookup_machine_cred("nfs");
620 if (!callback_cred)
621 return -ENOMEM;
622 return 0;
623}
624
Fengguang Wu2b4cf662012-11-13 15:41:27 -0500625static struct rpc_cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400626{
627 if (clp->cl_minorversion == 0) {
628 return get_rpccred(callback_cred);
629 } else {
630 struct rpc_auth *auth = client->cl_auth;
631 struct auth_cred acred = {};
632
633 acred.uid = ses->se_cb_sec.uid;
634 acred.gid = ses->se_cb_sec.gid;
635 return auth->au_ops->lookup_cred(client->cl_auth, &acred, 0);
636 }
637}
J. Bruce Fields2b47eec2007-07-27 18:06:50 -0400638
Kinglong Meed531c002014-03-24 11:59:46 +0800639static struct rpc_clnt *create_backchannel_client(struct rpc_create_args *args)
640{
641 struct rpc_xprt *xprt;
642
643 if (args->protocol != XPRT_TRANSPORT_BC_TCP)
644 return rpc_create(args);
645
646 xprt = args->bc_xprt->xpt_bc_xprt;
647 if (xprt) {
648 xprt_get(xprt);
649 return rpc_create_xprt(args, xprt);
650 }
651
652 return rpc_create(args);
653}
654
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400655static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
J. Bruce Fields2b47eec2007-07-27 18:06:50 -0400656{
Jeff Layton3758cf72014-04-15 08:51:48 -0400657 int maxtime = max_cb_time(clp->net);
Chuck Leverae5c7942006-08-22 20:06:21 -0400658 struct rpc_timeout timeparms = {
Jeff Layton3758cf72014-04-15 08:51:48 -0400659 .to_initval = maxtime,
J. Bruce Fields595947a2009-03-05 17:18:10 -0500660 .to_retries = 0,
Jeff Layton3758cf72014-04-15 08:51:48 -0400661 .to_maxval = maxtime,
Chuck Leverae5c7942006-08-22 20:06:21 -0400662 };
Chuck Leverae5c7942006-08-22 20:06:21 -0400663 struct rpc_create_args args = {
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300664 .net = clp->net,
J. Bruce Fields07263f12010-05-31 19:09:40 -0400665 .address = (struct sockaddr *) &conn->cb_addr,
666 .addrsize = conn->cb_addrlen,
Takuma Umeya6f3d7722010-12-15 14:09:01 +0900667 .saddress = (struct sockaddr *) &conn->cb_saddr,
Chuck Leverae5c7942006-08-22 20:06:21 -0400668 .timeout = &timeparms,
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400669 .program = &cb_program,
J. Bruce Fieldsb7299f42010-05-14 17:57:35 -0400670 .version = 0,
Olga Kornievskaiab6b61522008-06-09 16:51:31 -0400671 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
Chuck Leverae5c7942006-08-22 20:06:21 -0400672 };
J. Bruce Fields63c86712007-10-25 19:00:26 -0400673 struct rpc_clnt *client;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400674 struct rpc_cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400676 if (clp->cl_minorversion == 0) {
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400677 if (!clp->cl_cred.cr_principal &&
J. Bruce Fields39307652012-08-16 17:01:21 -0400678 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400679 return -EINVAL;
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400680 args.client_name = clp->cl_cred.cr_principal;
Himangi Saraogifc8e5a62014-07-23 20:12:31 +0530681 args.prognumber = conn->cb_prog;
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400682 args.protocol = XPRT_TRANSPORT_TCP;
J. Bruce Fields39307652012-08-16 17:01:21 -0400683 args.authflavor = clp->cl_cred.cr_flavor;
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400684 clp->cl_cb_ident = conn->cb_ident;
685 } else {
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400686 if (!conn->cb_xprt)
687 return -EINVAL;
688 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
689 clp->cl_cb_session = ses;
J. Bruce Fields07263f12010-05-31 19:09:40 -0400690 args.bc_xprt = conn->cb_xprt;
J. Bruce Fields8b5ce5c2010-10-19 17:31:50 -0400691 args.prognumber = clp->cl_cb_session->se_cb_prog;
Chuck Lever3c45ddf2014-07-16 15:38:32 -0400692 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
693 XPRT_TRANSPORT_BC;
J. Bruce Fields12fc3e92012-11-05 16:01:48 -0500694 args.authflavor = ses->se_cb_sec.flavor;
Alexandros Batsakis3ddc8bf2009-09-10 12:27:21 +0300695 }
Chuck Leverae5c7942006-08-22 20:06:21 -0400696 /* Create RPC client */
Kinglong Meed531c002014-03-24 11:59:46 +0800697 client = create_backchannel_client(&args);
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800698 if (IS_ERR(client)) {
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800699 dprintk("NFSD: couldn't create callback client: %ld\n",
700 PTR_ERR(client));
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800701 return PTR_ERR(client);
702 }
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400703 cred = get_backchannel_cred(clp, client, ses);
704 if (IS_ERR(cred)) {
705 rpc_shutdown_client(client);
706 return PTR_ERR(cred);
707 }
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400708 clp->cl_cb_client = client;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400709 clp->cl_cb_cred = cred;
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800710 return 0;
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800711}
712
J. Bruce Fieldsecdd03b2009-02-23 19:35:22 -0800713static void warn_no_callback_path(struct nfs4_client *clp, int reason)
714{
715 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
716 (int)clp->cl_name.len, clp->cl_name.data, reason);
717}
718
J. Bruce Fields77a35692010-04-30 18:51:44 -0400719static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
720{
721 clp->cl_cb_state = NFSD4_CB_DOWN;
722 warn_no_callback_path(clp, reason);
723}
724
Benny Halevy54237322011-10-19 19:12:58 -0700725static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
726{
727 clp->cl_cb_state = NFSD4_CB_FAULT;
728 warn_no_callback_path(clp, reason);
729}
730
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500731static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
732{
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400733 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500734
735 if (task->tk_status)
J. Bruce Fields77a35692010-04-30 18:51:44 -0400736 nfsd4_mark_cb_down(clp, task->tk_status);
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500737 else
J. Bruce Fields77a35692010-04-30 18:51:44 -0400738 clp->cl_cb_state = NFSD4_CB_UP;
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500739}
740
741static const struct rpc_call_ops nfsd4_cb_probe_ops = {
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400742 /* XXX: release method to ensure we set the cb channel down if
743 * necessary on early failure? */
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500744 .rpc_call_done = nfsd4_cb_probe_done,
745};
746
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400747static struct workqueue_struct *callback_wq;
J. Bruce Fields80fc0152009-09-15 18:07:35 -0400748
J. Bruce Fields229b2a02010-12-10 17:37:44 -0500749static void run_nfsd4_cb(struct nfsd4_callback *cb)
750{
751 queue_work(callback_wq, &cb->cb_work);
752}
753
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400754static void do_probe_callback(struct nfs4_client *clp)
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800755{
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400756 struct nfsd4_callback *cb = &clp->cl_cb_null;
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800757
J. Bruce Fieldsfb003922010-05-31 18:21:37 -0400758 cb->cb_op = NULL;
759 cb->cb_clp = clp;
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400760
761 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL];
762 cb->cb_msg.rpc_argp = NULL;
763 cb->cb_msg.rpc_resp = NULL;
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400764
765 cb->cb_ops = &nfsd4_cb_probe_ops;
766
J. Bruce Fields229b2a02010-12-10 17:37:44 -0500767 run_nfsd4_cb(cb);
J. Bruce Fields63c86712007-10-25 19:00:26 -0400768}
769
770/*
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400771 * Poke the callback thread to process any updates to the callback
772 * parameters, and send a null probe.
J. Bruce Fields63c86712007-10-25 19:00:26 -0400773 */
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400774void nfsd4_probe_callback(struct nfs4_client *clp)
775{
J. Bruce Fields77a35692010-04-30 18:51:44 -0400776 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
Jeff Laytona52d7262012-03-21 09:52:02 -0400777 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400778 do_probe_callback(clp);
779}
780
J. Bruce Fields84f5f7c2010-12-09 15:52:19 -0500781void nfsd4_probe_callback_sync(struct nfs4_client *clp)
782{
783 nfsd4_probe_callback(clp);
784 flush_workqueue(callback_wq);
785}
786
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400787void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
J. Bruce Fields63c86712007-10-25 19:00:26 -0400788{
J. Bruce Fields77a35692010-04-30 18:51:44 -0400789 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400790 spin_lock(&clp->cl_lock);
791 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400792 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793}
794
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300795/*
796 * There's currently a single callback channel slot.
797 * If the slot is available, then mark it busy. Otherwise, set the
798 * thread for sleeping on the callback RPC wait queue.
799 */
J. Bruce Fields3ff36002011-01-10 16:37:51 -0500800static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300801{
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300802 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
803 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
804 dprintk("%s slot is busy\n", __func__);
J. Bruce Fields3ff36002011-01-10 16:37:51 -0500805 return false;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300806 }
J. Bruce Fields3ff36002011-01-10 16:37:51 -0500807 return true;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300808}
809
810/*
811 * TODO: cb_sequence should support referring call lists, cachethis, multiple
812 * slots, and mark callback channel down on communication errors.
813 */
814static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
815{
J. Bruce Fields58784532010-05-16 16:47:08 -0400816 struct nfsd4_callback *cb = calldata;
J. Bruce Fields8be2d232013-03-21 10:59:29 -0400817 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields8323c3b2010-10-19 19:36:51 -0400818 u32 minorversion = clp->cl_minorversion;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300819
J. Bruce Fieldsfb003922010-05-31 18:21:37 -0400820 cb->cb_minorversion = minorversion;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300821 if (minorversion) {
J. Bruce Fields3ff36002011-01-10 16:37:51 -0500822 if (!nfsd41_cb_get_slot(clp, task))
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300823 return;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300824 }
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500825 spin_lock(&clp->cl_lock);
J. Bruce Fieldsa8f28002011-01-14 14:25:48 -0500826 if (list_empty(&cb->cb_per_client)) {
827 /* This is the first call, not a restart */
828 cb->cb_done = false;
829 list_add(&cb->cb_per_client, &clp->cl_callbacks);
830 }
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500831 spin_unlock(&clp->cl_lock);
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300832 rpc_call_start(task);
833}
834
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300835static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
836{
J. Bruce Fields58784532010-05-16 16:47:08 -0400837 struct nfsd4_callback *cb = calldata;
J. Bruce Fields8be2d232013-03-21 10:59:29 -0400838 struct nfs4_client *clp = cb->cb_clp;
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300839
840 dprintk("%s: minorversion=%d\n", __func__,
J. Bruce Fields8323c3b2010-10-19 19:36:51 -0400841 clp->cl_minorversion);
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300842
J. Bruce Fields8323c3b2010-10-19 19:36:51 -0400843 if (clp->cl_minorversion) {
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300844 /* No need for lock, access serialized in nfsd4_cb_prepare */
J. Bruce Fieldsac7c46f2010-06-14 19:01:57 -0400845 ++clp->cl_cb_session->se_cb_seq_nr;
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300846 clear_bit(0, &clp->cl_cb_slot_busy);
847 rpc_wake_up_next(&clp->cl_cb_waitq);
848 dprintk("%s: freed slot, new seqid=%d\n", __func__,
J. Bruce Fieldsac7c46f2010-06-14 19:01:57 -0400849 clp->cl_cb_session->se_cb_seq_nr);
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300850
851 /* We're done looking into the sequence information */
852 task->tk_msg.rpc_resp = NULL;
853 }
854}
855
J. Bruce Fields4b21d0d2010-03-07 23:39:01 -0500856
J. Bruce Fields63e48632009-05-01 22:36:55 -0400857static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
858{
J. Bruce Fields58784532010-05-16 16:47:08 -0400859 struct nfsd4_callback *cb = calldata;
860 struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
J. Bruce Fields8be2d232013-03-21 10:59:29 -0400861 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields4b21d0d2010-03-07 23:39:01 -0500862 struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
J. Bruce Fields63e48632009-05-01 22:36:55 -0400863
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300864 nfsd4_cb_done(task, calldata);
865
J. Bruce Fieldsa8f28002011-01-14 14:25:48 -0500866 if (current_rpc_client != task->tk_client) {
867 /* We're shutting down or changing cl_cb_client; leave
868 * it to nfsd4_process_cb_update to restart the call if
869 * necessary. */
J. Bruce Fields4b21d0d2010-03-07 23:39:01 -0500870 return;
871 }
872
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500873 if (cb->cb_done)
874 return;
J. Bruce Fields63e48632009-05-01 22:36:55 -0400875 switch (task->tk_status) {
J. Bruce Fields172c85d2010-05-30 11:53:12 -0400876 case 0:
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500877 cb->cb_done = true;
J. Bruce Fields172c85d2010-05-30 11:53:12 -0400878 return;
879 case -EBADHANDLE:
880 case -NFS4ERR_BAD_STATEID:
881 /* Race: client probably got cb_recall
882 * before open reply granting delegation */
883 break;
884 default:
J. Bruce Fields63e48632009-05-01 22:36:55 -0400885 /* Network partition? */
J. Bruce Fields77a35692010-04-30 18:51:44 -0400886 nfsd4_mark_cb_down(clp, task->tk_status);
J. Bruce Fields63e48632009-05-01 22:36:55 -0400887 }
888 if (dp->dl_retries--) {
889 rpc_delay(task, 2*HZ);
890 task->tk_status = 0;
Boaz Harroshc18c8212010-06-29 14:33:55 +0300891 rpc_restart_call_prepare(task);
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +0300892 return;
J. Bruce Fields63e48632009-05-01 22:36:55 -0400893 }
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500894 nfsd4_mark_cb_down(clp, task->tk_status);
895 cb->cb_done = true;
J. Bruce Fields63e48632009-05-01 22:36:55 -0400896}
897
898static void nfsd4_cb_recall_release(void *calldata)
899{
J. Bruce Fields58784532010-05-16 16:47:08 -0400900 struct nfsd4_callback *cb = calldata;
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500901 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields58784532010-05-16 16:47:08 -0400902 struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
J. Bruce Fields63e48632009-05-01 22:36:55 -0400903
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500904 if (cb->cb_done) {
905 spin_lock(&clp->cl_lock);
906 list_del(&cb->cb_per_client);
907 spin_unlock(&clp->cl_lock);
Trond Myklebust60116952014-07-29 21:34:06 -0400908 nfs4_put_stid(&dp->dl_stid);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -0500909 }
J. Bruce Fields63e48632009-05-01 22:36:55 -0400910}
911
912static const struct rpc_call_ops nfsd4_cb_recall_ops = {
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +0300913 .rpc_call_prepare = nfsd4_cb_prepare,
J. Bruce Fields63e48632009-05-01 22:36:55 -0400914 .rpc_call_done = nfsd4_cb_recall_done,
915 .rpc_release = nfsd4_cb_recall_release,
916};
917
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500918int nfsd4_create_callback_queue(void)
919{
920 callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
921 if (!callback_wq)
922 return -ENOMEM;
923 return 0;
924}
925
926void nfsd4_destroy_callback_queue(void)
927{
928 destroy_workqueue(callback_wq);
929}
930
Benny Halevyab707e152010-05-12 00:14:06 +0300931/* must be called under the state lock */
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400932void nfsd4_shutdown_callback(struct nfs4_client *clp)
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500933{
Jeff Laytona52d7262012-03-21 09:52:02 -0400934 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500935 /*
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400936 * Note this won't actually result in a null callback;
Jeff Layton02e12152014-07-16 10:31:57 -0400937 * instead, nfsd4_run_cb_null() will detect the killed
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400938 * client, destroy the rpc client, and stop:
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500939 */
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400940 do_probe_callback(clp);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500941 flush_workqueue(callback_wq);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500942}
943
Kirill A. Shutemov65e4c892010-12-16 15:25:54 +0200944static void nfsd4_release_cb(struct nfsd4_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945{
J. Bruce Fields58784532010-05-16 16:47:08 -0400946 if (cb->cb_ops->rpc_release)
947 cb->cb_ops->rpc_release(cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948}
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -0500949
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400950/* requires cl_lock: */
951static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
952{
953 struct nfsd4_session *s;
954 struct nfsd4_conn *c;
955
956 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
957 list_for_each_entry(c, &s->se_conns, cn_persession) {
958 if (c->cn_flags & NFS4_CDFC4_BACK)
959 return c;
960 }
961 }
962 return NULL;
963}
964
Kirill A. Shutemov65e4c892010-12-16 15:25:54 +0200965static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400966{
967 struct nfs4_cb_conn conn;
968 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400969 struct nfsd4_session *ses = NULL;
970 struct nfsd4_conn *c;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400971 int err;
972
973 /*
974 * This is either an update, or the client dying; in either case,
975 * kill the old client:
976 */
977 if (clp->cl_cb_client) {
978 rpc_shutdown_client(clp->cl_cb_client);
979 clp->cl_cb_client = NULL;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400980 put_rpccred(clp->cl_cb_cred);
981 clp->cl_cb_cred = NULL;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400982 }
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400983 if (clp->cl_cb_conn.cb_xprt) {
984 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
985 clp->cl_cb_conn.cb_xprt = NULL;
986 }
Jeff Laytona52d7262012-03-21 09:52:02 -0400987 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400988 return;
989 spin_lock(&clp->cl_lock);
990 /*
991 * Only serialized callback code is allowed to clear these
992 * flags; main nfsd code can only set them:
993 */
Jeff Laytona52d7262012-03-21 09:52:02 -0400994 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
995 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400996 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400997 c = __nfsd4_find_backchannel(clp);
998 if (c) {
999 svc_xprt_get(c->cn_xprt);
1000 conn.cb_xprt = c->cn_xprt;
1001 ses = c->cn_session;
1002 }
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001003 spin_unlock(&clp->cl_lock);
1004
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001005 err = setup_callback_client(clp, &conn, ses);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001006 if (err) {
J. Bruce Fields8546ee52012-03-09 17:02:28 -05001007 nfsd4_mark_cb_down(clp, err);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001008 return;
1009 }
1010 /* Yay, the callback channel's back! Restart any callbacks: */
1011 list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client)
1012 run_nfsd4_cb(cb);
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001013}
1014
Jeff Layton02e12152014-07-16 10:31:57 -04001015static void
1016nfsd4_run_callback_rpc(struct nfsd4_callback *cb)
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001017{
J. Bruce Fieldsfb003922010-05-31 18:21:37 -04001018 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001019 struct rpc_clnt *clnt;
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001020
Jeff Laytona52d7262012-03-21 09:52:02 -04001021 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001022 nfsd4_process_cb_update(cb);
1023
1024 clnt = clp->cl_cb_client;
1025 if (!clnt) {
1026 /* Callback channel broken, or client killed; give up: */
J. Bruce Fields58784532010-05-16 16:47:08 -04001027 nfsd4_release_cb(cb);
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001028 return;
J. Bruce Fields58784532010-05-16 16:47:08 -04001029 }
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -04001030 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
J. Bruce Fieldscee277d2010-05-26 17:52:14 -04001031 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
1032 cb->cb_ops, cb);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001033}
1034
Jeff Layton02e12152014-07-16 10:31:57 -04001035void
1036nfsd4_run_cb_null(struct work_struct *w)
1037{
1038 struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback,
1039 cb_work);
1040 nfsd4_run_callback_rpc(cb);
1041}
1042
1043void
1044nfsd4_run_cb_recall(struct work_struct *w)
1045{
1046 struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback,
1047 cb_work);
1048
1049 nfsd4_prepare_cb_recall(cb->cb_op);
1050 nfsd4_run_callback_rpc(cb);
1051}
1052
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001053void nfsd4_cb_recall(struct nfs4_delegation *dp)
1054{
J. Bruce Fields58784532010-05-16 16:47:08 -04001055 struct nfsd4_callback *cb = &dp->dl_recall;
J. Bruce Fields2a74aba2011-09-23 17:20:02 -04001056 struct nfs4_client *clp = dp->dl_stid.sc_client;
J. Bruce Fields58784532010-05-16 16:47:08 -04001057
1058 dp->dl_retries = 1;
J. Bruce Fieldsfb003922010-05-31 18:21:37 -04001059 cb->cb_op = dp;
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001060 cb->cb_clp = clp;
J. Bruce Fields58784532010-05-16 16:47:08 -04001061 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL];
J. Bruce Fieldsfb003922010-05-31 18:21:37 -04001062 cb->cb_msg.rpc_argp = cb;
1063 cb->cb_msg.rpc_resp = cb;
J. Bruce Fields58784532010-05-16 16:47:08 -04001064
1065 cb->cb_ops = &nfsd4_cb_recall_ops;
J. Bruce Fields58784532010-05-16 16:47:08 -04001066
J. Bruce Fields9ee1ba52011-01-13 17:08:19 -05001067 INIT_LIST_HEAD(&cb->cb_per_client);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001068 cb->cb_done = true;
1069
J. Bruce Fields229b2a02010-12-10 17:37:44 -05001070 run_nfsd4_cb(&dp->dl_recall);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001071}