blob: c3b11a715082914c2bfee7be0d27a507be967fdd [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"
Olga Kornievskaia9eb190fca8f2018-07-20 18:19:17 -040042#include "xdr4.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44#define NFSDDBG_FACILITY NFSDDBG_PROC
45
Benny Halevy54237322011-10-19 19:12:58 -070046static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define NFSPROC4_CB_NULL 0
49#define NFSPROC4_CB_COMPOUND 1
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051/* Index of predefined Linux callback client operations */
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053struct nfs4_cb_compound_hdr {
Andy Adamson38524ab2009-09-10 12:25:59 +030054 /* args */
55 u32 ident; /* minorversion 0 only */
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 u32 nops;
Andy Adamsonef52bff2009-06-16 04:20:50 +030057 __be32 *nops_p;
Andy Adamsonab52ae62009-06-16 04:20:53 +030058 u32 minorversion;
Andy Adamson38524ab2009-09-10 12:25:59 +030059 /* res */
60 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061};
62
Chuck Levera033db42010-12-14 14:57:22 +000063static __be32 *xdr_encode_empty_array(__be32 *p)
64{
65 *p++ = xdr_zero;
66 return p;
67}
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069/*
Chuck Levera033db42010-12-14 14:57:22 +000070 * Encode/decode NFSv4 CB basic data types
71 *
72 * Basic NFSv4 callback data types are defined in section 15 of RFC
73 * 3530: "Network File System (NFS) version 4 Protocol" and section
74 * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
75 * 1 Protocol"
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 */
77
Chuck Levera033db42010-12-14 14:57:22 +000078/*
79 * nfs_cb_opnum4
80 *
81 * enum nfs_cb_opnum4 {
82 * OP_CB_GETATTR = 3,
83 * ...
84 * };
85 */
86enum nfs_cb_opnum4 {
87 OP_CB_GETATTR = 3,
88 OP_CB_RECALL = 4,
89 OP_CB_LAYOUTRECALL = 5,
90 OP_CB_NOTIFY = 6,
91 OP_CB_PUSH_DELEG = 7,
92 OP_CB_RECALL_ANY = 8,
93 OP_CB_RECALLABLE_OBJ_AVAIL = 9,
94 OP_CB_RECALL_SLOT = 10,
95 OP_CB_SEQUENCE = 11,
96 OP_CB_WANTS_CANCELLED = 12,
97 OP_CB_NOTIFY_LOCK = 13,
98 OP_CB_NOTIFY_DEVICEID = 14,
Olga Kornievskaia9eb190fca8f2018-07-20 18:19:17 -040099 OP_CB_OFFLOAD = 15,
Chuck Levera033db42010-12-14 14:57:22 +0000100 OP_CB_ILLEGAL = 10044
101};
102
103static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
Benny Halevy9303bbd2010-05-25 09:50:23 +0300104{
105 __be32 *p;
106
Chuck Levera033db42010-12-14 14:57:22 +0000107 p = xdr_reserve_space(xdr, 4);
108 *p = cpu_to_be32(op);
Benny Halevy9303bbd2010-05-25 09:50:23 +0300109}
110
Chuck Levera033db42010-12-14 14:57:22 +0000111/*
112 * nfs_fh4
113 *
114 * typedef opaque nfs_fh4<NFS4_FHSIZE>;
115 */
116static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
117{
118 u32 length = fh->fh_size;
119 __be32 *p;
120
121 BUG_ON(length > NFS4_FHSIZE);
122 p = xdr_reserve_space(xdr, 4 + length);
123 xdr_encode_opaque(p, &fh->fh_base, length);
124}
125
126/*
127 * stateid4
128 *
129 * struct stateid4 {
130 * uint32_t seqid;
131 * opaque other[12];
132 * };
133 */
134static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
135{
136 __be32 *p;
137
138 p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
139 *p++ = cpu_to_be32(sid->si_generation);
140 xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
141}
142
143/*
144 * sessionid4
145 *
146 * typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
147 */
148static void encode_sessionid4(struct xdr_stream *xdr,
149 const struct nfsd4_session *session)
150{
151 __be32 *p;
152
153 p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
154 xdr_encode_opaque_fixed(p, session->se_sessionid.data,
155 NFS4_MAX_SESSIONID_LEN);
156}
157
158/*
Chuck Lever85a56482010-12-14 14:57:32 +0000159 * nfsstat4
160 */
161static const struct {
162 int stat;
163 int errno;
164} nfs_cb_errtbl[] = {
165 { NFS4_OK, 0 },
166 { NFS4ERR_PERM, -EPERM },
167 { NFS4ERR_NOENT, -ENOENT },
168 { NFS4ERR_IO, -EIO },
169 { NFS4ERR_NXIO, -ENXIO },
170 { NFS4ERR_ACCESS, -EACCES },
171 { NFS4ERR_EXIST, -EEXIST },
172 { NFS4ERR_XDEV, -EXDEV },
173 { NFS4ERR_NOTDIR, -ENOTDIR },
174 { NFS4ERR_ISDIR, -EISDIR },
175 { NFS4ERR_INVAL, -EINVAL },
176 { NFS4ERR_FBIG, -EFBIG },
177 { NFS4ERR_NOSPC, -ENOSPC },
178 { NFS4ERR_ROFS, -EROFS },
179 { NFS4ERR_MLINK, -EMLINK },
180 { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
181 { NFS4ERR_NOTEMPTY, -ENOTEMPTY },
182 { NFS4ERR_DQUOT, -EDQUOT },
183 { NFS4ERR_STALE, -ESTALE },
184 { NFS4ERR_BADHANDLE, -EBADHANDLE },
185 { NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
186 { NFS4ERR_NOTSUPP, -ENOTSUPP },
187 { NFS4ERR_TOOSMALL, -ETOOSMALL },
188 { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
189 { NFS4ERR_BADTYPE, -EBADTYPE },
190 { NFS4ERR_LOCKED, -EAGAIN },
191 { NFS4ERR_RESOURCE, -EREMOTEIO },
192 { NFS4ERR_SYMLINK, -ELOOP },
193 { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
194 { NFS4ERR_DEADLOCK, -EDEADLK },
195 { -1, -EIO }
196};
197
198/*
199 * If we cannot translate the error, the recovery routines should
200 * handle it.
201 *
202 * Note: remaining NFSv4 error codes have values > 10000, so should
203 * not conflict with native Linux error codes.
204 */
205static int nfs_cb_stat_to_errno(int status)
206{
207 int i;
208
209 for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
210 if (nfs_cb_errtbl[i].stat == status)
211 return nfs_cb_errtbl[i].errno;
212 }
213
214 dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
215 return -status;
216}
217
Stefan Agner47299f72018-03-19 23:37:05 +0100218static int decode_cb_op_status(struct xdr_stream *xdr,
219 enum nfs_cb_opnum4 expected, int *status)
Chuck Lever85a56482010-12-14 14:57:32 +0000220{
221 __be32 *p;
222 u32 op;
223
224 p = xdr_inline_decode(xdr, 4 + 4);
225 if (unlikely(p == NULL))
226 goto out_overflow;
227 op = be32_to_cpup(p++);
228 if (unlikely(op != expected))
229 goto out_unexpected;
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200230 *status = nfs_cb_stat_to_errno(be32_to_cpup(p));
Chuck Lever85a56482010-12-14 14:57:32 +0000231 return 0;
232out_overflow:
Chuck Lever85a56482010-12-14 14:57:32 +0000233 return -EIO;
234out_unexpected:
235 dprintk("NFSD: Callback server returned operation %d but "
236 "we issued a request for %d\n", op, expected);
237 return -EIO;
238}
239
240/*
Chuck Levera033db42010-12-14 14:57:22 +0000241 * CB_COMPOUND4args
242 *
243 * struct CB_COMPOUND4args {
244 * utf8str_cs tag;
245 * uint32_t minorversion;
246 * uint32_t callback_ident;
247 * nfs_cb_argop4 argarray<>;
248 * };
249*/
250static void encode_cb_compound4args(struct xdr_stream *xdr,
251 struct nfs4_cb_compound_hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Al Virof00f3282006-10-19 23:29:01 -0700253 __be32 * p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Chuck Levera033db42010-12-14 14:57:22 +0000255 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
256 p = xdr_encode_empty_array(p); /* empty tag */
257 *p++ = cpu_to_be32(hdr->minorversion);
258 *p++ = cpu_to_be32(hdr->ident);
259
Andy Adamsonef52bff2009-06-16 04:20:50 +0300260 hdr->nops_p = p;
Chuck Levera033db42010-12-14 14:57:22 +0000261 *p = cpu_to_be32(hdr->nops); /* argarray element count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262}
263
Chuck Levera033db42010-12-14 14:57:22 +0000264/*
265 * Update argarray element count
266 */
Andy Adamsonef52bff2009-06-16 04:20:50 +0300267static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
268{
Chuck Levera033db42010-12-14 14:57:22 +0000269 BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
270 *hdr->nops_p = cpu_to_be32(hdr->nops);
Andy Adamsonef52bff2009-06-16 04:20:50 +0300271}
272
Chuck Levera033db42010-12-14 14:57:22 +0000273/*
Chuck Lever85a56482010-12-14 14:57:32 +0000274 * CB_COMPOUND4res
275 *
276 * struct CB_COMPOUND4res {
277 * nfsstat4 status;
278 * utf8str_cs tag;
279 * nfs_cb_resop4 resarray<>;
280 * };
281 */
282static int decode_cb_compound4res(struct xdr_stream *xdr,
283 struct nfs4_cb_compound_hdr *hdr)
284{
285 u32 length;
286 __be32 *p;
287
288 p = xdr_inline_decode(xdr, 4 + 4);
289 if (unlikely(p == NULL))
290 goto out_overflow;
291 hdr->status = be32_to_cpup(p++);
292 /* Ignore the tag */
293 length = be32_to_cpup(p++);
294 p = xdr_inline_decode(xdr, length + 4);
295 if (unlikely(p == NULL))
296 goto out_overflow;
Kinglong Meee86a40b2017-02-05 09:57:37 +0800297 p += XDR_QUADLEN(length);
Chuck Lever85a56482010-12-14 14:57:32 +0000298 hdr->nops = be32_to_cpup(p);
299 return 0;
300out_overflow:
Chuck Lever85a56482010-12-14 14:57:32 +0000301 return -EIO;
302}
303
304/*
Chuck Levera033db42010-12-14 14:57:22 +0000305 * CB_RECALL4args
306 *
307 * struct CB_RECALL4args {
308 * stateid4 stateid;
309 * bool truncate;
310 * nfs_fh4 fh;
311 * };
312 */
313static void encode_cb_recall4args(struct xdr_stream *xdr,
314 const struct nfs4_delegation *dp,
315 struct nfs4_cb_compound_hdr *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Al Virof00f3282006-10-19 23:29:01 -0700317 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
Chuck Levera033db42010-12-14 14:57:22 +0000319 encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
J. Bruce Fieldsd5477a82011-09-08 12:07:44 -0400320 encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
Chuck Levera033db42010-12-14 14:57:22 +0000321
322 p = xdr_reserve_space(xdr, 4);
323 *p++ = xdr_zero; /* truncate */
324
Trond Myklebust11b91642014-07-29 21:34:08 -0400325 encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle);
Chuck Levera033db42010-12-14 14:57:22 +0000326
Andy Adamsonef52bff2009-06-16 04:20:50 +0300327 hdr->nops++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
Chuck Levera033db42010-12-14 14:57:22 +0000330/*
331 * CB_SEQUENCE4args
332 *
333 * struct CB_SEQUENCE4args {
334 * sessionid4 csa_sessionid;
335 * sequenceid4 csa_sequenceid;
336 * slotid4 csa_slotid;
337 * slotid4 csa_highest_slotid;
338 * bool csa_cachethis;
339 * referring_call_list4 csa_referring_call_lists<>;
340 * };
341 */
342static void encode_cb_sequence4args(struct xdr_stream *xdr,
343 const struct nfsd4_callback *cb,
344 struct nfs4_cb_compound_hdr *hdr)
Benny Halevy2af73582009-09-10 12:26:51 +0300345{
Chuck Levera033db42010-12-14 14:57:22 +0000346 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
Benny Halevy2af73582009-09-10 12:26:51 +0300347 __be32 *p;
348
349 if (hdr->minorversion == 0)
350 return;
351
Chuck Levera033db42010-12-14 14:57:22 +0000352 encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
353 encode_sessionid4(xdr, session);
Benny Halevy2af73582009-09-10 12:26:51 +0300354
Chuck Levera033db42010-12-14 14:57:22 +0000355 p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
356 *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
357 *p++ = xdr_zero; /* csa_slotid */
358 *p++ = xdr_zero; /* csa_highest_slotid */
359 *p++ = xdr_zero; /* csa_cachethis */
360 xdr_encode_empty_array(p); /* csa_referring_call_lists */
361
Benny Halevy2af73582009-09-10 12:26:51 +0300362 hdr->nops++;
363}
364
Chuck Levera033db42010-12-14 14:57:22 +0000365/*
Chuck Lever85a56482010-12-14 14:57:32 +0000366 * CB_SEQUENCE4resok
367 *
368 * struct CB_SEQUENCE4resok {
369 * sessionid4 csr_sessionid;
370 * sequenceid4 csr_sequenceid;
371 * slotid4 csr_slotid;
372 * slotid4 csr_highest_slotid;
373 * slotid4 csr_target_highest_slotid;
374 * };
375 *
376 * union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
377 * case NFS4_OK:
378 * CB_SEQUENCE4resok csr_resok4;
379 * default:
380 * void;
381 * };
382 *
383 * Our current back channel implmentation supports a single backchannel
384 * with a single slot.
385 */
386static int decode_cb_sequence4resok(struct xdr_stream *xdr,
387 struct nfsd4_callback *cb)
388{
389 struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
Kinglong Mee82743382017-02-05 09:57:48 +0800390 int status = -ESERVERFAULT;
Chuck Lever85a56482010-12-14 14:57:32 +0000391 __be32 *p;
392 u32 dummy;
393
Chuck Lever85a56482010-12-14 14:57:32 +0000394 /*
395 * If the server returns different values for sessionID, slotID or
396 * sequence number, the server is looney tunes.
397 */
Benny Halevy2c9c8f32011-02-22 14:43:22 -0800398 p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
Chuck Lever85a56482010-12-14 14:57:32 +0000399 if (unlikely(p == NULL))
400 goto out_overflow;
Kinglong Mee82743382017-02-05 09:57:48 +0800401
402 if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
Chuck Lever85a56482010-12-14 14:57:32 +0000403 dprintk("NFS: %s Invalid session id\n", __func__);
404 goto out;
405 }
406 p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
407
408 dummy = be32_to_cpup(p++);
409 if (dummy != session->se_cb_seq_nr) {
410 dprintk("NFS: %s Invalid sequence number\n", __func__);
411 goto out;
412 }
413
414 dummy = be32_to_cpup(p++);
415 if (dummy != 0) {
416 dprintk("NFS: %s Invalid slotid\n", __func__);
417 goto out;
418 }
419
420 /*
421 * FIXME: process highest slotid and target highest slotid
422 */
423 status = 0;
424out:
Kinglong Mee7ba6cad2015-06-24 16:33:37 +0800425 cb->cb_seq_status = status;
Chuck Lever85a56482010-12-14 14:57:32 +0000426 return status;
427out_overflow:
Kinglong Mee7ba6cad2015-06-24 16:33:37 +0800428 status = -EIO;
429 goto out;
Chuck Lever85a56482010-12-14 14:57:32 +0000430}
431
432static int decode_cb_sequence4res(struct xdr_stream *xdr,
433 struct nfsd4_callback *cb)
434{
Chuck Lever85a56482010-12-14 14:57:32 +0000435 int status;
436
Jeff Layton89dfdc92016-08-16 13:29:27 -0400437 if (cb->cb_clp->cl_minorversion == 0)
Chuck Lever85a56482010-12-14 14:57:32 +0000438 return 0;
439
Kinglong Mee7ba6cad2015-06-24 16:33:37 +0800440 status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
441 if (unlikely(status || cb->cb_seq_status))
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200442 return status;
443
444 return decode_cb_sequence4resok(xdr, cb);
Chuck Lever85a56482010-12-14 14:57:32 +0000445}
446
447/*
Chuck Levera033db42010-12-14 14:57:22 +0000448 * NFSv4.0 and NFSv4.1 XDR encode functions
449 *
450 * NFSv4.0 callback argument types are defined in section 15 of RFC
451 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
452 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
453 * Protocol".
454 */
455
456/*
457 * NB: Without this zero space reservation, callbacks over krb5p fail
458 */
Chuck Lever9f06c712010-12-14 14:59:18 +0000459static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
Christoph Hellwig1502c812017-05-08 14:47:53 +0200460 const void *__unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
Chuck Levera033db42010-12-14 14:57:22 +0000462 xdr_reserve_space(xdr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463}
464
Chuck Levera033db42010-12-14 14:57:22 +0000465/*
466 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
467 */
Chuck Lever9f06c712010-12-14 14:59:18 +0000468static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
Christoph Hellwig1502c812017-05-08 14:47:53 +0200469 const void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Christoph Hellwig1502c812017-05-08 14:47:53 +0200471 const struct nfsd4_callback *cb = data;
Jeff Layton34549ab2014-10-01 08:05:22 -0400472 const struct nfs4_delegation *dp = cb_to_delegation(cb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 struct nfs4_cb_compound_hdr hdr = {
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400474 .ident = cb->cb_clp->cl_cb_ident,
Jeff Layton89dfdc92016-08-16 13:29:27 -0400475 .minorversion = cb->cb_clp->cl_minorversion,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 };
477
Chuck Lever9f06c712010-12-14 14:59:18 +0000478 encode_cb_compound4args(xdr, &hdr);
479 encode_cb_sequence4args(xdr, cb, &hdr);
Christoph Hellwig2faf3b42014-09-24 12:19:16 +0200480 encode_cb_recall4args(xdr, dp, &hdr);
Andy Adamsonef52bff2009-06-16 04:20:50 +0300481 encode_cb_nops(&hdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
484
Chuck Lever85a56482010-12-14 14:57:32 +0000485/*
486 * NFSv4.0 and NFSv4.1 XDR decode functions
487 *
488 * NFSv4.0 callback result types are defined in section 15 of RFC
489 * 3530: "Network File System (NFS) version 4 Protocol" and section 20
490 * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
491 * Protocol".
492 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Chuck Leverbf269552010-12-14 14:59:29 +0000494static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
495 void *__unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 return 0;
498}
499
Benny Halevy2af73582009-09-10 12:26:51 +0300500/*
Chuck Lever85a56482010-12-14 14:57:32 +0000501 * 20.2. Operation 4: CB_RECALL - Recall a Delegation
Benny Halevy2af73582009-09-10 12:26:51 +0300502 */
Chuck Leverbf269552010-12-14 14:59:29 +0000503static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
504 struct xdr_stream *xdr,
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200505 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200507 struct nfsd4_callback *cb = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 struct nfs4_cb_compound_hdr hdr;
509 int status;
510
Chuck Leverbf269552010-12-14 14:59:29 +0000511 status = decode_cb_compound4res(xdr, &hdr);
Chuck Lever85a56482010-12-14 14:57:32 +0000512 if (unlikely(status))
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200513 return status;
Chuck Lever85a56482010-12-14 14:57:32 +0000514
J. Bruce Fields10fa8ac2019-07-30 19:06:38 -0400515 status = decode_cb_sequence4res(xdr, cb);
516 if (unlikely(status || cb->cb_seq_status))
517 return status;
Chuck Lever85a56482010-12-14 14:57:32 +0000518
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200519 return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520}
521
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200522#ifdef CONFIG_NFSD_PNFS
523/*
524 * CB_LAYOUTRECALL4args
525 *
526 * struct layoutrecall_file4 {
527 * nfs_fh4 lor_fh;
528 * offset4 lor_offset;
529 * length4 lor_length;
530 * stateid4 lor_stateid;
531 * };
532 *
533 * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) {
534 * case LAYOUTRECALL4_FILE:
535 * layoutrecall_file4 lor_layout;
536 * case LAYOUTRECALL4_FSID:
537 * fsid4 lor_fsid;
538 * case LAYOUTRECALL4_ALL:
539 * void;
540 * };
541 *
542 * struct CB_LAYOUTRECALL4args {
543 * layouttype4 clora_type;
544 * layoutiomode4 clora_iomode;
545 * bool clora_changed;
546 * layoutrecall4 clora_recall;
547 * };
548 */
549static void encode_cb_layout4args(struct xdr_stream *xdr,
550 const struct nfs4_layout_stateid *ls,
551 struct nfs4_cb_compound_hdr *hdr)
552{
553 __be32 *p;
554
555 BUG_ON(hdr->minorversion == 0);
556
557 p = xdr_reserve_space(xdr, 5 * 4);
558 *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL);
559 *p++ = cpu_to_be32(ls->ls_layout_type);
560 *p++ = cpu_to_be32(IOMODE_ANY);
561 *p++ = cpu_to_be32(1);
562 *p = cpu_to_be32(RETURN_FILE);
563
564 encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle);
565
566 p = xdr_reserve_space(xdr, 2 * 8);
567 p = xdr_encode_hyper(p, 0);
568 xdr_encode_hyper(p, NFS4_MAX_UINT64);
569
570 encode_stateid4(xdr, &ls->ls_recall_sid);
571
572 hdr->nops++;
573}
574
575static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req,
576 struct xdr_stream *xdr,
Christoph Hellwig1502c812017-05-08 14:47:53 +0200577 const void *data)
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200578{
Christoph Hellwig1502c812017-05-08 14:47:53 +0200579 const struct nfsd4_callback *cb = data;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200580 const struct nfs4_layout_stateid *ls =
581 container_of(cb, struct nfs4_layout_stateid, ls_recall);
582 struct nfs4_cb_compound_hdr hdr = {
583 .ident = 0,
Jeff Layton89dfdc92016-08-16 13:29:27 -0400584 .minorversion = cb->cb_clp->cl_minorversion,
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200585 };
586
587 encode_cb_compound4args(xdr, &hdr);
588 encode_cb_sequence4args(xdr, cb, &hdr);
589 encode_cb_layout4args(xdr, ls, &hdr);
590 encode_cb_nops(&hdr);
591}
592
593static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
594 struct xdr_stream *xdr,
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200595 void *data)
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200596{
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200597 struct nfsd4_callback *cb = data;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200598 struct nfs4_cb_compound_hdr hdr;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200599 int status;
600
601 status = decode_cb_compound4res(xdr, &hdr);
602 if (unlikely(status))
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200603 return status;
604
J. Bruce Fields10fa8ac2019-07-30 19:06:38 -0400605 status = decode_cb_sequence4res(xdr, cb);
606 if (unlikely(status || cb->cb_seq_status))
607 return status;
608
Christoph Hellwigef2a1b32015-04-30 11:49:23 +0200609 return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200610}
611#endif /* CONFIG_NFSD_PNFS */
612
Jeff Laytona188620e2016-09-16 16:28:23 -0400613static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so)
614{
615 __be32 *p;
616
617 p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len);
618 p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8);
619 xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len);
620}
621
622static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req,
623 struct xdr_stream *xdr,
Christoph Hellwig1502c812017-05-08 14:47:53 +0200624 const void *data)
Jeff Laytona188620e2016-09-16 16:28:23 -0400625{
Christoph Hellwig1502c812017-05-08 14:47:53 +0200626 const struct nfsd4_callback *cb = data;
Jeff Laytona188620e2016-09-16 16:28:23 -0400627 const struct nfsd4_blocked_lock *nbl =
628 container_of(cb, struct nfsd4_blocked_lock, nbl_cb);
629 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner;
630 struct nfs4_cb_compound_hdr hdr = {
631 .ident = 0,
632 .minorversion = cb->cb_clp->cl_minorversion,
633 };
634
635 __be32 *p;
636
637 BUG_ON(hdr.minorversion == 0);
638
639 encode_cb_compound4args(xdr, &hdr);
640 encode_cb_sequence4args(xdr, cb, &hdr);
641
642 p = xdr_reserve_space(xdr, 4);
643 *p = cpu_to_be32(OP_CB_NOTIFY_LOCK);
644 encode_nfs_fh4(xdr, &nbl->nbl_fh);
645 encode_stateowner(xdr, &lo->lo_owner);
646 hdr.nops++;
647
648 encode_cb_nops(&hdr);
649}
650
651static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp,
652 struct xdr_stream *xdr,
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200653 void *data)
Jeff Laytona188620e2016-09-16 16:28:23 -0400654{
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200655 struct nfsd4_callback *cb = data;
Jeff Laytona188620e2016-09-16 16:28:23 -0400656 struct nfs4_cb_compound_hdr hdr;
657 int status;
658
659 status = decode_cb_compound4res(xdr, &hdr);
660 if (unlikely(status))
661 return status;
662
J. Bruce Fields10fa8ac2019-07-30 19:06:38 -0400663 status = decode_cb_sequence4res(xdr, cb);
664 if (unlikely(status || cb->cb_seq_status))
665 return status;
666
Jeff Laytona188620e2016-09-16 16:28:23 -0400667 return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status);
668}
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670/*
Olga Kornievskaia9eb190fca8f2018-07-20 18:19:17 -0400671 * struct write_response4 {
672 * stateid4 wr_callback_id<1>;
673 * length4 wr_count;
674 * stable_how4 wr_committed;
675 * verifier4 wr_writeverf;
676 * };
677 * union offload_info4 switch (nfsstat4 coa_status) {
678 * case NFS4_OK:
679 * write_response4 coa_resok4;
680 * default:
681 * length4 coa_bytes_copied;
682 * };
683 * struct CB_OFFLOAD4args {
684 * nfs_fh4 coa_fh;
685 * stateid4 coa_stateid;
686 * offload_info4 coa_offload_info;
687 * };
688 */
689static void encode_offload_info4(struct xdr_stream *xdr,
690 __be32 nfserr,
691 const struct nfsd4_copy *cp)
692{
693 __be32 *p;
694
695 p = xdr_reserve_space(xdr, 4);
696 *p++ = nfserr;
697 if (!nfserr) {
698 p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE);
699 p = xdr_encode_empty_array(p);
700 p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written);
701 *p++ = cpu_to_be32(cp->cp_res.wr_stable_how);
702 p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data,
703 NFS4_VERIFIER_SIZE);
704 } else {
705 p = xdr_reserve_space(xdr, 8);
706 /* We always return success if bytes were written */
707 p = xdr_encode_hyper(p, 0);
708 }
709}
710
711static void encode_cb_offload4args(struct xdr_stream *xdr,
712 __be32 nfserr,
713 const struct knfsd_fh *fh,
714 const struct nfsd4_copy *cp,
715 struct nfs4_cb_compound_hdr *hdr)
716{
717 __be32 *p;
718
719 p = xdr_reserve_space(xdr, 4);
720 *p++ = cpu_to_be32(OP_CB_OFFLOAD);
721 encode_nfs_fh4(xdr, fh);
722 encode_stateid4(xdr, &cp->cp_res.cb_stateid);
723 encode_offload_info4(xdr, nfserr, cp);
724
725 hdr->nops++;
726}
727
728static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req,
729 struct xdr_stream *xdr,
730 const void *data)
731{
732 const struct nfsd4_callback *cb = data;
733 const struct nfsd4_copy *cp =
734 container_of(cb, struct nfsd4_copy, cp_cb);
735 struct nfs4_cb_compound_hdr hdr = {
736 .ident = 0,
737 .minorversion = cb->cb_clp->cl_minorversion,
738 };
739
740 encode_cb_compound4args(xdr, &hdr);
741 encode_cb_sequence4args(xdr, cb, &hdr);
742 encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr);
743 encode_cb_nops(&hdr);
744}
745
746static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp,
747 struct xdr_stream *xdr,
748 void *data)
749{
750 struct nfsd4_callback *cb = data;
751 struct nfs4_cb_compound_hdr hdr;
752 int status;
753
754 status = decode_cb_compound4res(xdr, &hdr);
755 if (unlikely(status))
756 return status;
757
J. Bruce Fields10fa8ac2019-07-30 19:06:38 -0400758 status = decode_cb_sequence4res(xdr, cb);
759 if (unlikely(status || cb->cb_seq_status))
760 return status;
761
Olga Kornievskaia9eb190fca8f2018-07-20 18:19:17 -0400762 return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status);
763}
764/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 * RPC procedure tables
766 */
Chuck Lever7d93bd712010-12-14 14:57:42 +0000767#define PROC(proc, call, argtype, restype) \
768[NFSPROC4_CLNT_##proc] = { \
769 .p_proc = NFSPROC4_CB_##call, \
Christoph Hellwig1502c812017-05-08 14:47:53 +0200770 .p_encode = nfs4_xdr_enc_##argtype, \
Christoph Hellwigd39916c2017-05-08 15:04:45 +0200771 .p_decode = nfs4_xdr_dec_##restype, \
Chuck Lever7d93bd712010-12-14 14:57:42 +0000772 .p_arglen = NFS4_enc_##argtype##_sz, \
773 .p_replen = NFS4_dec_##restype##_sz, \
774 .p_statidx = NFSPROC4_CB_##call, \
775 .p_name = #proc, \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
Christoph Hellwig499b4982017-05-12 15:36:49 +0200778static const struct rpc_procinfo nfs4_cb_procedures[] = {
Chuck Lever7d93bd712010-12-14 14:57:42 +0000779 PROC(CB_NULL, NULL, cb_null, cb_null),
780 PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200781#ifdef CONFIG_NFSD_PNFS
782 PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout),
783#endif
Jeff Laytona188620e2016-09-16 16:28:23 -0400784 PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock),
Olga Kornievskaia9eb190fca8f2018-07-20 18:19:17 -0400785 PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786};
787
Christoph Hellwig1c5876d2017-05-08 23:27:10 +0200788static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)];
Christoph Hellwig02be49f2017-05-12 15:58:06 +0200789static const struct rpc_version nfs_cb_version4 = {
J. Bruce Fieldsb7299f42010-05-14 17:57:35 -0400790/*
791 * Note on the callback rpc program version number: despite language in rfc
792 * 5661 section 18.36.3 requiring servers to use 4 in this field, the
793 * official xdr descriptions for both 4.0 and 4.1 specify version 1, and
794 * in practice that appears to be what implementations use. The section
795 * 18.36.3 language is expected to be fixed in an erratum.
796 */
Chuck Lever7d93bd712010-12-14 14:57:42 +0000797 .number = 1,
798 .nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
Christoph Hellwig1c5876d2017-05-08 23:27:10 +0200799 .procs = nfs4_cb_procedures,
800 .counts = nfs4_cb_counts,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801};
802
Trond Myklebusteff79362017-07-16 22:57:27 +0000803static const struct rpc_version *nfs_cb_version[2] = {
804 [1] = &nfs_cb_version4,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805};
806
Trond Myklebusta613fa12012-01-20 13:53:56 -0500807static const struct rpc_program cb_program;
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400808
809static struct rpc_stat cb_stats = {
Chuck Lever7d93bd712010-12-14 14:57:42 +0000810 .program = &cb_program
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400811};
812
813#define NFS4_CALLBACK 0x40000000
Trond Myklebusta613fa12012-01-20 13:53:56 -0500814static const struct rpc_program cb_program = {
Chuck Lever7d93bd712010-12-14 14:57:42 +0000815 .name = "nfs4_cb",
816 .number = NFS4_CALLBACK,
817 .nrvers = ARRAY_SIZE(nfs_cb_version),
818 .version = nfs_cb_version,
819 .stats = &cb_stats,
Stanislav Kinsbursky0157d022012-01-11 19:18:01 +0400820 .pipe_dir_name = "nfsd4_cb",
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400821};
822
Stanislav Kinsbursky3d733712012-11-27 14:11:44 +0300823static int max_cb_time(struct net *net)
J. Bruce Fields595947a2009-03-05 17:18:10 -0500824{
Stanislav Kinsbursky3d733712012-11-27 14:11:44 +0300825 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
Arnd Bergmann20b7d862019-11-04 16:31:52 +0100826
827 /*
828 * nfsd4_lease is set to at most one hour in __nfsd4_write_time,
829 * so we can use 32-bit math on it. Warn if that assumption
830 * ever stops being true.
831 */
832 if (WARN_ON_ONCE(nn->nfsd4_lease > 3600))
833 return 360 * HZ;
834
835 return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ;
J. Bruce Fields595947a2009-03-05 17:18:10 -0500836}
837
Trond Myklebust2bbfed92019-10-23 17:43:18 -0400838static struct workqueue_struct *callback_wq;
839
840static bool nfsd4_queue_cb(struct nfsd4_callback *cb)
841{
842 return queue_work(callback_wq, &cb->cb_work);
843}
844
845static void nfsd41_cb_inflight_begin(struct nfs4_client *clp)
846{
847 atomic_inc(&clp->cl_cb_inflight);
848}
849
850static void nfsd41_cb_inflight_end(struct nfs4_client *clp)
851{
852
853 if (atomic_dec_and_test(&clp->cl_cb_inflight))
854 wake_up_var(&clp->cl_cb_inflight);
855}
856
857static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp)
858{
859 wait_var_event(&clp->cl_cb_inflight,
860 !atomic_read(&clp->cl_cb_inflight));
861}
862
NeilBrowna52458b2018-12-03 11:30:31 +1100863static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses)
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400864{
865 if (clp->cl_minorversion == 0) {
NeilBrown5e169232018-12-03 11:30:30 +1100866 client->cl_principal = clp->cl_cred.cr_targ_princ ?
867 clp->cl_cred.cr_targ_princ : "nfs";
Chuck Levercb25e7b2018-08-16 12:06:04 -0400868
NeilBrowna52458b2018-12-03 11:30:31 +1100869 return get_cred(rpc_machine_cred());
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400870 } else {
NeilBrown97f68c6b2018-12-03 11:30:30 +1100871 struct cred *kcred;
NeilBrown97f68c6b2018-12-03 11:30:30 +1100872
873 kcred = prepare_kernel_cred(NULL);
874 if (!kcred)
875 return NULL;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400876
NeilBrown8276c902018-12-03 11:30:30 +1100877 kcred->uid = ses->se_cb_sec.uid;
878 kcred->gid = ses->se_cb_sec.gid;
NeilBrowna52458b2018-12-03 11:30:31 +1100879 return kcred;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400880 }
881}
J. Bruce Fields2b47eec2007-07-27 18:06:50 -0400882
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400883static 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 -0400884{
Jeff Layton3758cf72014-04-15 08:51:48 -0400885 int maxtime = max_cb_time(clp->net);
Chuck Leverae5c7942006-08-22 20:06:21 -0400886 struct rpc_timeout timeparms = {
Jeff Layton3758cf72014-04-15 08:51:48 -0400887 .to_initval = maxtime,
J. Bruce Fields595947a2009-03-05 17:18:10 -0500888 .to_retries = 0,
Jeff Layton3758cf72014-04-15 08:51:48 -0400889 .to_maxval = maxtime,
Chuck Leverae5c7942006-08-22 20:06:21 -0400890 };
Chuck Leverae5c7942006-08-22 20:06:21 -0400891 struct rpc_create_args args = {
Stanislav Kinsburskyc212cec2012-11-14 18:21:10 +0300892 .net = clp->net,
J. Bruce Fields07263f12010-05-31 19:09:40 -0400893 .address = (struct sockaddr *) &conn->cb_addr,
894 .addrsize = conn->cb_addrlen,
Takuma Umeya6f3d7722010-12-15 14:09:01 +0900895 .saddress = (struct sockaddr *) &conn->cb_saddr,
Chuck Leverae5c7942006-08-22 20:06:21 -0400896 .timeout = &timeparms,
Olga Kornievskaiaff7d9752008-03-28 16:04:56 -0400897 .program = &cb_program,
Trond Myklebusteff79362017-07-16 22:57:27 +0000898 .version = 1,
Olga Kornievskaiab6b61522008-06-09 16:51:31 -0400899 .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
Trond Myklebust79caa5f2019-04-24 17:46:42 -0400900 .cred = current_cred(),
Chuck Leverae5c7942006-08-22 20:06:21 -0400901 };
J. Bruce Fields63c86712007-10-25 19:00:26 -0400902 struct rpc_clnt *client;
NeilBrowna52458b2018-12-03 11:30:31 +1100903 const struct cred *cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400905 if (clp->cl_minorversion == 0) {
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400906 if (!clp->cl_cred.cr_principal &&
J. Bruce Fields39307652012-08-16 17:01:21 -0400907 (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5))
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400908 return -EINVAL;
J. Bruce Fields03a4e1f2012-05-14 19:55:22 -0400909 args.client_name = clp->cl_cred.cr_principal;
Himangi Saraogifc8e5a62014-07-23 20:12:31 +0530910 args.prognumber = conn->cb_prog;
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400911 args.protocol = XPRT_TRANSPORT_TCP;
J. Bruce Fields39307652012-08-16 17:01:21 -0400912 args.authflavor = clp->cl_cred.cr_flavor;
J. Bruce Fields5d18c1c2010-10-19 23:00:12 -0400913 clp->cl_cb_ident = conn->cb_ident;
914 } else {
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -0400915 if (!conn->cb_xprt)
916 return -EINVAL;
917 clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
918 clp->cl_cb_session = ses;
J. Bruce Fields07263f12010-05-31 19:09:40 -0400919 args.bc_xprt = conn->cb_xprt;
J. Bruce Fields8b5ce5c2010-10-19 17:31:50 -0400920 args.prognumber = clp->cl_cb_session->se_cb_prog;
Chuck Lever3c45ddf2014-07-16 15:38:32 -0400921 args.protocol = conn->cb_xprt->xpt_class->xcl_ident |
922 XPRT_TRANSPORT_BC;
J. Bruce Fields12fc3e92012-11-05 16:01:48 -0500923 args.authflavor = ses->se_cb_sec.flavor;
Alexandros Batsakis3ddc8bf2009-09-10 12:27:21 +0300924 }
Chuck Leverae5c7942006-08-22 20:06:21 -0400925 /* Create RPC client */
J. Bruce Fieldsd50039e2016-05-16 17:03:42 -0400926 client = rpc_create(&args);
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800927 if (IS_ERR(client)) {
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800928 dprintk("NFSD: couldn't create callback client: %ld\n",
929 PTR_ERR(client));
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800930 return PTR_ERR(client);
931 }
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400932 cred = get_backchannel_cred(clp, client, ses);
Dan Carpenter1c3da442019-01-04 09:47:03 +0300933 if (!cred) {
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400934 rpc_shutdown_client(client);
Dan Carpenter1c3da442019-01-04 09:47:03 +0300935 return -ENOMEM;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400936 }
J. Bruce Fields6ff8da02010-06-04 20:04:45 -0400937 clp->cl_cb_client = client;
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -0400938 clp->cl_cb_cred = cred;
J. Bruce Fieldse1cab5a52009-02-23 10:45:27 -0800939 return 0;
J. Bruce Fieldsa601cae2009-02-22 16:43:45 -0800940}
941
J. Bruce Fieldsecdd03b2009-02-23 19:35:22 -0800942static void warn_no_callback_path(struct nfs4_client *clp, int reason)
943{
944 dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
945 (int)clp->cl_name.len, clp->cl_name.data, reason);
946}
947
J. Bruce Fields77a35692010-04-30 18:51:44 -0400948static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
949{
J. Bruce Fieldsd4f72cb2015-11-24 15:43:03 -0700950 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
951 return;
J. Bruce Fields77a35692010-04-30 18:51:44 -0400952 clp->cl_cb_state = NFSD4_CB_DOWN;
953 warn_no_callback_path(clp, reason);
954}
955
Benny Halevy54237322011-10-19 19:12:58 -0700956static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
957{
J. Bruce Fieldsd4f72cb2015-11-24 15:43:03 -0700958 if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags))
959 return;
Benny Halevy54237322011-10-19 19:12:58 -0700960 clp->cl_cb_state = NFSD4_CB_FAULT;
961 warn_no_callback_path(clp, reason);
962}
963
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500964static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
965{
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400966 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500967
968 if (task->tk_status)
J. Bruce Fields77a35692010-04-30 18:51:44 -0400969 nfsd4_mark_cb_down(clp, task->tk_status);
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500970 else
J. Bruce Fields77a35692010-04-30 18:51:44 -0400971 clp->cl_cb_state = NFSD4_CB_UP;
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500972}
973
Trond Myklebust2bbfed92019-10-23 17:43:18 -0400974static void nfsd4_cb_probe_release(void *calldata)
975{
976 struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
977
978 nfsd41_cb_inflight_end(clp);
979
980}
981
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500982static const struct rpc_call_ops nfsd4_cb_probe_ops = {
J. Bruce Fieldscee277d2010-05-26 17:52:14 -0400983 /* XXX: release method to ensure we set the cb channel down if
984 * necessary on early failure? */
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500985 .rpc_call_done = nfsd4_cb_probe_done,
Trond Myklebust2bbfed92019-10-23 17:43:18 -0400986 .rpc_release = nfsd4_cb_probe_release,
J. Bruce Fieldse300a632009-03-05 15:01:11 -0500987};
988
J. Bruce Fields63c86712007-10-25 19:00:26 -0400989/*
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400990 * Poke the callback thread to process any updates to the callback
991 * parameters, and send a null probe.
J. Bruce Fields63c86712007-10-25 19:00:26 -0400992 */
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400993void nfsd4_probe_callback(struct nfs4_client *clp)
994{
J. Bruce Fields77a35692010-04-30 18:51:44 -0400995 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
Jeff Laytona52d7262012-03-21 09:52:02 -0400996 set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
Christoph Hellwigf0b5de12014-09-24 12:19:18 +0200997 nfsd4_run_cb(&clp->cl_cb_null);
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -0400998}
999
J. Bruce Fields84f5f7c2010-12-09 15:52:19 -05001000void nfsd4_probe_callback_sync(struct nfs4_client *clp)
1001{
1002 nfsd4_probe_callback(clp);
1003 flush_workqueue(callback_wq);
1004}
1005
J. Bruce Fields5a3c9d72010-10-19 17:56:52 -04001006void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
J. Bruce Fields63c86712007-10-25 19:00:26 -04001007{
J. Bruce Fields77a35692010-04-30 18:51:44 -04001008 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001009 spin_lock(&clp->cl_lock);
1010 memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001011 spin_unlock(&clp->cl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012}
1013
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001014/*
1015 * There's currently a single callback channel slot.
1016 * If the slot is available, then mark it busy. Otherwise, set the
1017 * thread for sleeping on the callback RPC wait queue.
1018 */
Trond Myklebust12357f12019-11-07 17:11:57 -05001019static bool nfsd41_cb_get_slot(struct nfsd4_callback *cb, struct rpc_task *task)
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001020{
Trond Myklebust12357f12019-11-07 17:11:57 -05001021 struct nfs4_client *clp = cb->cb_clp;
1022
1023 if (!cb->cb_holds_slot &&
1024 test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001025 rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
Trond Myklebustc6c15e12014-11-19 12:47:50 -05001026 /* Race breaker */
1027 if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
1028 dprintk("%s slot is busy\n", __func__);
1029 return false;
1030 }
1031 rpc_wake_up_queued_task(&clp->cl_cb_waitq, task);
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001032 }
Trond Myklebust12357f12019-11-07 17:11:57 -05001033 cb->cb_holds_slot = true;
J. Bruce Fields3ff36002011-01-10 16:37:51 -05001034 return true;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001035}
1036
Trond Myklebust12357f12019-11-07 17:11:57 -05001037static void nfsd41_cb_release_slot(struct nfsd4_callback *cb)
1038{
1039 struct nfs4_client *clp = cb->cb_clp;
1040
1041 if (cb->cb_holds_slot) {
1042 cb->cb_holds_slot = false;
1043 clear_bit(0, &clp->cl_cb_slot_busy);
1044 rpc_wake_up_next(&clp->cl_cb_waitq);
1045 }
1046}
1047
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001048static void nfsd41_destroy_cb(struct nfsd4_callback *cb)
1049{
1050 struct nfs4_client *clp = cb->cb_clp;
1051
1052 nfsd41_cb_release_slot(cb);
1053 if (cb->cb_ops && cb->cb_ops->release)
1054 cb->cb_ops->release(cb);
1055 nfsd41_cb_inflight_end(clp);
1056}
1057
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001058/*
1059 * TODO: cb_sequence should support referring call lists, cachethis, multiple
1060 * slots, and mark callback channel down on communication errors.
1061 */
1062static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
1063{
J. Bruce Fields58784532010-05-16 16:47:08 -04001064 struct nfsd4_callback *cb = calldata;
J. Bruce Fields8be2d232013-03-21 10:59:29 -04001065 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields8323c3b2010-10-19 19:36:51 -04001066 u32 minorversion = clp->cl_minorversion;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001067
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001068 /*
1069 * cb_seq_status is only set in decode_cb_sequence4res,
1070 * and so will remain 1 if an rpc level failure occurs.
1071 */
1072 cb->cb_seq_status = 1;
Kinglong Mee43993962015-06-02 18:59:19 +08001073 cb->cb_status = 0;
Trond Myklebust12357f12019-11-07 17:11:57 -05001074 if (minorversion && !nfsd41_cb_get_slot(cb, task))
1075 return;
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001076 rpc_call_start(task);
1077}
1078
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001079static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
1080{
1081 struct nfs4_client *clp = cb->cb_clp;
1082 struct nfsd4_session *session = clp->cl_cb_session;
1083 bool ret = true;
1084
1085 if (!clp->cl_minorversion) {
1086 /*
1087 * If the backchannel connection was shut down while this
1088 * task was queued, we need to resubmit it after setting up
1089 * a new backchannel connection.
1090 *
1091 * Note that if we lost our callback connection permanently
1092 * the submission code will error out, so we don't need to
1093 * handle that case here.
1094 */
Trond Myklebustae67bd32019-04-07 13:58:44 -04001095 if (RPC_SIGNALLED(task))
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001096 goto need_restart;
1097
1098 return true;
1099 }
1100
Trond Myklebuste6abc8c2019-04-05 08:54:37 -07001101 if (!cb->cb_holds_slot)
1102 goto need_restart;
1103
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001104 switch (cb->cb_seq_status) {
1105 case 0:
1106 /*
1107 * No need for lock, access serialized in nfsd4_cb_prepare
1108 *
1109 * RFC5661 20.9.3
1110 * If CB_SEQUENCE returns an error, then the state of the slot
1111 * (sequence ID, cached reply) MUST NOT change.
1112 */
1113 ++session->se_cb_seq_nr;
1114 break;
1115 case -ESERVERFAULT:
1116 ++session->se_cb_seq_nr;
Gustavo A. R. Silva7b4d6da2018-07-31 21:24:10 -05001117 /* Fall through */
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001118 case 1:
1119 case -NFS4ERR_BADSESSION:
1120 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
1121 ret = false;
1122 break;
1123 case -NFS4ERR_DELAY:
1124 if (!rpc_restart_call(task))
1125 goto out;
1126
1127 rpc_delay(task, 2 * HZ);
1128 return false;
1129 case -NFS4ERR_BADSLOT:
1130 goto retry_nowait;
1131 case -NFS4ERR_SEQ_MISORDERED:
1132 if (session->se_cb_seq_nr != 1) {
1133 session->se_cb_seq_nr = 1;
1134 goto retry_nowait;
1135 }
1136 break;
1137 default:
J. Bruce Fields20428a82019-10-22 12:29:37 -04001138 nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001139 dprintk("%s: unprocessed error %d\n", __func__,
1140 cb->cb_seq_status);
1141 }
1142
Trond Myklebust12357f12019-11-07 17:11:57 -05001143 nfsd41_cb_release_slot(cb);
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001144 dprintk("%s: freed slot, new seqid=%d\n", __func__,
1145 clp->cl_cb_session->se_cb_seq_nr);
1146
Trond Myklebustae67bd32019-04-07 13:58:44 -04001147 if (RPC_SIGNALLED(task))
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001148 goto need_restart;
1149out:
1150 return ret;
1151retry_nowait:
1152 if (rpc_restart_call_prepare(task))
1153 ret = false;
1154 goto out;
1155need_restart:
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001156 if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) {
1157 task->tk_status = 0;
1158 cb->cb_need_restart = true;
1159 }
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001160 return false;
1161}
1162
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +03001163static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
1164{
J. Bruce Fields58784532010-05-16 16:47:08 -04001165 struct nfsd4_callback *cb = calldata;
J. Bruce Fields8be2d232013-03-21 10:59:29 -04001166 struct nfs4_client *clp = cb->cb_clp;
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +03001167
1168 dprintk("%s: minorversion=%d\n", __func__,
J. Bruce Fields8323c3b2010-10-19 19:36:51 -04001169 clp->cl_minorversion);
Ricardo Labiaga0421b5c2009-09-10 12:27:04 +03001170
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001171 if (!nfsd4_cb_sequence_done(task, cb))
J. Bruce Fields4b21d0d2010-03-07 23:39:01 -05001172 return;
J. Bruce Fields4b21d0d2010-03-07 23:39:01 -05001173
Christoph Hellwigef2a1b32015-04-30 11:49:23 +02001174 if (cb->cb_status) {
1175 WARN_ON_ONCE(task->tk_status);
1176 task->tk_status = cb->cb_status;
1177 }
1178
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001179 switch (cb->cb_ops->done(cb, task)) {
J. Bruce Fields172c85d2010-05-30 11:53:12 -04001180 case 0:
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001181 task->tk_status = 0;
1182 rpc_restart_call_prepare(task);
1183 return;
1184 case 1:
Scott Mayhew1c73b9d2019-05-02 13:32:12 -04001185 switch (task->tk_status) {
1186 case -EIO:
1187 case -ETIMEDOUT:
1188 nfsd4_mark_cb_down(clp, task->tk_status);
1189 }
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001190 break;
1191 default:
1192 BUG();
J. Bruce Fields63e48632009-05-01 22:36:55 -04001193 }
J. Bruce Fields63e48632009-05-01 22:36:55 -04001194}
1195
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001196static void nfsd4_cb_release(void *calldata)
J. Bruce Fields63e48632009-05-01 22:36:55 -04001197{
J. Bruce Fields58784532010-05-16 16:47:08 -04001198 struct nfsd4_callback *cb = calldata;
J. Bruce Fields63e48632009-05-01 22:36:55 -04001199
Christoph Hellwigcba5f622015-04-30 11:49:24 +02001200 if (cb->cb_need_restart)
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001201 nfsd4_queue_cb(cb);
Christoph Hellwigcba5f622015-04-30 11:49:24 +02001202 else
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001203 nfsd41_destroy_cb(cb);
Christoph Hellwigcba5f622015-04-30 11:49:24 +02001204
J. Bruce Fields63e48632009-05-01 22:36:55 -04001205}
1206
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001207static const struct rpc_call_ops nfsd4_cb_ops = {
Ricardo Labiaga2a1d1b52009-09-10 12:26:38 +03001208 .rpc_call_prepare = nfsd4_cb_prepare,
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001209 .rpc_call_done = nfsd4_cb_done,
1210 .rpc_release = nfsd4_cb_release,
J. Bruce Fields63e48632009-05-01 22:36:55 -04001211};
1212
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001213int nfsd4_create_callback_queue(void)
1214{
J. Bruce Fields88382032016-11-14 11:13:43 -05001215 callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001216 if (!callback_wq)
1217 return -ENOMEM;
1218 return 0;
1219}
1220
1221void nfsd4_destroy_callback_queue(void)
1222{
1223 destroy_workqueue(callback_wq);
1224}
1225
Benny Halevyab707e152010-05-12 00:14:06 +03001226/* must be called under the state lock */
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001227void nfsd4_shutdown_callback(struct nfs4_client *clp)
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001228{
Jeff Laytona52d7262012-03-21 09:52:02 -04001229 set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001230 /*
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001231 * Note this won't actually result in a null callback;
Jeff Layton02e12152014-07-16 10:31:57 -04001232 * instead, nfsd4_run_cb_null() will detect the killed
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001233 * client, destroy the rpc client, and stop:
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001234 */
Christoph Hellwigf0b5de12014-09-24 12:19:18 +02001235 nfsd4_run_cb(&clp->cl_cb_null);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001236 flush_workqueue(callback_wq);
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001237 nfsd41_cb_inflight_wait_complete(clp);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001238}
1239
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001240/* requires cl_lock: */
1241static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
1242{
1243 struct nfsd4_session *s;
1244 struct nfsd4_conn *c;
1245
1246 list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
1247 list_for_each_entry(c, &s->se_conns, cn_persession) {
1248 if (c->cn_flags & NFS4_CDFC4_BACK)
1249 return c;
1250 }
1251 }
1252 return NULL;
1253}
1254
J. Bruce Fieldscc1ce2f2019-10-29 16:02:18 -04001255/*
1256 * Note there isn't a lot of locking in this code; instead we depend on
1257 * the fact that it is run from the callback_wq, which won't run two
1258 * work items at once. So, for example, callback_wq handles all access
1259 * of cl_cb_client and all calls to rpc_create or rpc_shutdown_client.
1260 */
Kirill A. Shutemov65e4c892010-12-16 15:25:54 +02001261static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001262{
1263 struct nfs4_cb_conn conn;
1264 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001265 struct nfsd4_session *ses = NULL;
1266 struct nfsd4_conn *c;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001267 int err;
1268
1269 /*
1270 * This is either an update, or the client dying; in either case,
1271 * kill the old client:
1272 */
1273 if (clp->cl_cb_client) {
1274 rpc_shutdown_client(clp->cl_cb_client);
1275 clp->cl_cb_client = NULL;
NeilBrowna52458b2018-12-03 11:30:31 +11001276 put_cred(clp->cl_cb_cred);
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -04001277 clp->cl_cb_cred = NULL;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001278 }
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001279 if (clp->cl_cb_conn.cb_xprt) {
1280 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1281 clp->cl_cb_conn.cb_xprt = NULL;
1282 }
Jeff Laytona52d7262012-03-21 09:52:02 -04001283 if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001284 return;
1285 spin_lock(&clp->cl_lock);
1286 /*
1287 * Only serialized callback code is allowed to clear these
1288 * flags; main nfsd code can only set them:
1289 */
Jeff Laytona52d7262012-03-21 09:52:02 -04001290 BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
1291 clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001292 memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001293 c = __nfsd4_find_backchannel(clp);
1294 if (c) {
1295 svc_xprt_get(c->cn_xprt);
1296 conn.cb_xprt = c->cn_xprt;
1297 ses = c->cn_session;
1298 }
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001299 spin_unlock(&clp->cl_lock);
1300
J. Bruce Fieldsdcbeaa62010-06-15 17:25:45 -04001301 err = setup_callback_client(clp, &conn, ses);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001302 if (err) {
J. Bruce Fields8546ee52012-03-09 17:02:28 -05001303 nfsd4_mark_cb_down(clp, err);
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001304 return;
1305 }
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001306}
1307
Jeff Layton02e12152014-07-16 10:31:57 -04001308static void
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001309nfsd4_run_cb_work(struct work_struct *work)
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001310{
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001311 struct nfsd4_callback *cb =
1312 container_of(work, struct nfsd4_callback, cb_work);
J. Bruce Fieldsfb003922010-05-31 18:21:37 -04001313 struct nfs4_client *clp = cb->cb_clp;
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001314 struct rpc_clnt *clnt;
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001315
Christoph Hellwigcba5f622015-04-30 11:49:24 +02001316 if (cb->cb_need_restart) {
1317 cb->cb_need_restart = false;
1318 } else {
1319 if (cb->cb_ops && cb->cb_ops->prepare)
1320 cb->cb_ops->prepare(cb);
1321 }
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001322
Jeff Laytona52d7262012-03-21 09:52:02 -04001323 if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001324 nfsd4_process_cb_update(cb);
1325
1326 clnt = clp->cl_cb_client;
1327 if (!clnt) {
1328 /* Callback channel broken, or client killed; give up: */
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001329 nfsd41_destroy_cb(cb);
J. Bruce Fields6ff8da02010-06-04 20:04:45 -04001330 return;
J. Bruce Fields58784532010-05-16 16:47:08 -04001331 }
Christoph Hellwig4bd9e9b2015-04-30 11:49:25 +02001332
1333 /*
1334 * Don't send probe messages for 4.1 or later.
1335 */
1336 if (!cb->cb_ops && clp->cl_minorversion) {
1337 clp->cl_cb_state = NFSD4_CB_UP;
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001338 nfsd41_destroy_cb(cb);
Christoph Hellwig4bd9e9b2015-04-30 11:49:25 +02001339 return;
1340 }
1341
J. Bruce Fieldsc6bb3ca2012-11-01 16:31:02 -04001342 cb->cb_msg.rpc_cred = clp->cl_cb_cred;
J. Bruce Fieldscee277d2010-05-26 17:52:14 -04001343 rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001344 cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb);
Jeff Layton02e12152014-07-16 10:31:57 -04001345}
1346
Christoph Hellwigf0b5de12014-09-24 12:19:18 +02001347void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
Julia Lawallc4cb8972015-11-21 22:57:39 +01001348 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op)
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001349{
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001350 cb->cb_clp = clp;
Christoph Hellwig326129d2014-09-24 12:19:17 +02001351 cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op];
J. Bruce Fieldsfb003922010-05-31 18:21:37 -04001352 cb->cb_msg.rpc_argp = cb;
1353 cb->cb_msg.rpc_resp = cb;
Christoph Hellwig0162ac22014-09-24 12:19:19 +02001354 cb->cb_ops = ops;
1355 INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
Kinglong Mee7ba6cad2015-06-24 16:33:37 +08001356 cb->cb_seq_status = 1;
Christoph Hellwigef2a1b32015-04-30 11:49:23 +02001357 cb->cb_status = 0;
Christoph Hellwigcba5f622015-04-30 11:49:24 +02001358 cb->cb_need_restart = false;
Trond Myklebuste6abc8c2019-04-05 08:54:37 -07001359 cb->cb_holds_slot = false;
Christoph Hellwigf0b5de12014-09-24 12:19:18 +02001360}
J. Bruce Fields5ce8ba22011-01-10 16:44:41 -05001361
Christoph Hellwigf0b5de12014-09-24 12:19:18 +02001362void nfsd4_run_cb(struct nfsd4_callback *cb)
1363{
Trond Myklebust2bbfed92019-10-23 17:43:18 -04001364 struct nfs4_client *clp = cb->cb_clp;
1365
1366 nfsd41_cb_inflight_begin(clp);
1367 if (!nfsd4_queue_cb(cb))
1368 nfsd41_cb_inflight_end(clp);
J. Bruce Fieldsb5a1a812010-03-03 14:52:55 -05001369}