7d4495eac7a9a433e69eccf53ec275acca60bb86
[sfrench/cifs-2.6.git] / fs / nfsd / nfs4proc.c
1 /*
2  *  Server-side procedures for NFSv4.
3  *
4  *  Copyright (c) 2002 The Regents of the University of Michigan.
5  *  All rights reserved.
6  *
7  *  Kendrick Smith <kmsmith@umich.edu>
8  *  Andy Adamson   <andros@umich.edu>
9  *
10  *  Redistribution and use in source and binary forms, with or without
11  *  modification, are permitted provided that the following conditions
12  *  are met:
13  *
14  *  1. Redistributions of source code must retain the above copyright
15  *     notice, this list of conditions and the following disclaimer.
16  *  2. Redistributions in binary form must reproduce the above copyright
17  *     notice, this list of conditions and the following disclaimer in the
18  *     documentation and/or other materials provided with the distribution.
19  *  3. Neither the name of the University nor the names of its
20  *     contributors may be used to endorse or promote products derived
21  *     from this software without specific prior written permission.
22  *
23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 #include <linux/file.h>
36 #include <linux/falloc.h>
37 #include <linux/slab.h>
38
39 #include "idmap.h"
40 #include "cache.h"
41 #include "xdr4.h"
42 #include "vfs.h"
43 #include "current_stateid.h"
44 #include "netns.h"
45 #include "acl.h"
46 #include "pnfs.h"
47 #include "trace.h"
48
49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
50 #include <linux/security.h>
51
52 static inline void
53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
54 {
55         struct inode *inode = d_inode(resfh->fh_dentry);
56         int status;
57
58         inode_lock(inode);
59         status = security_inode_setsecctx(resfh->fh_dentry,
60                 label->data, label->len);
61         inode_unlock(inode);
62
63         if (status)
64                 /*
65                  * XXX: We should really fail the whole open, but we may
66                  * already have created a new file, so it may be too
67                  * late.  For now this seems the least of evils:
68                  */
69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
70
71         return;
72 }
73 #else
74 static inline void
75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
76 { }
77 #endif
78
79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
80
81 static u32 nfsd_attrmask[] = {
82         NFSD_WRITEABLE_ATTRS_WORD0,
83         NFSD_WRITEABLE_ATTRS_WORD1,
84         NFSD_WRITEABLE_ATTRS_WORD2
85 };
86
87 static u32 nfsd41_ex_attrmask[] = {
88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
90         NFSD_SUPPATTR_EXCLCREAT_WORD2
91 };
92
93 static __be32
94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
95                    u32 *bmval, u32 *writable)
96 {
97         struct dentry *dentry = cstate->current_fh.fh_dentry;
98         struct svc_export *exp = cstate->current_fh.fh_export;
99
100         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
101                 return nfserr_attrnotsupp;
102         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
103                 return nfserr_attrnotsupp;
104         if ((bmval[2] & FATTR4_WORD2_SECURITY_LABEL) &&
105                         !(exp->ex_flags & NFSEXP_SECURITY_LABEL))
106                 return nfserr_attrnotsupp;
107         if (writable && !bmval_is_subset(bmval, writable))
108                 return nfserr_inval;
109         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
110                         (bmval[1] & FATTR4_WORD1_MODE))
111                 return nfserr_inval;
112         return nfs_ok;
113 }
114
115 static __be32
116 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
117         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
118 {
119         __be32 status = nfs_ok;
120
121         if (open->op_create == NFS4_OPEN_CREATE) {
122                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
123                     || open->op_createmode == NFS4_CREATE_GUARDED)
124                         status = check_attr_support(rqstp, cstate,
125                                         open->op_bmval, nfsd_attrmask);
126                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
127                         status = check_attr_support(rqstp, cstate,
128                                         open->op_bmval, nfsd41_ex_attrmask);
129         }
130
131         return status;
132 }
133
134 static int
135 is_create_with_attrs(struct nfsd4_open *open)
136 {
137         return open->op_create == NFS4_OPEN_CREATE
138                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
139                     || open->op_createmode == NFS4_CREATE_GUARDED
140                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
141 }
142
143 /*
144  * if error occurs when setting the acl, just clear the acl bit
145  * in the returned attr bitmap.
146  */
147 static void
148 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
149                 struct nfs4_acl *acl, u32 *bmval)
150 {
151         __be32 status;
152
153         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
154         if (status)
155                 /*
156                  * We should probably fail the whole open at this point,
157                  * but we've already created the file, so it's too late;
158                  * So this seems the least of evils:
159                  */
160                 bmval[0] &= ~FATTR4_WORD0_ACL;
161 }
162
163 static inline void
164 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
165 {
166         fh_put(dst);
167         dget(src->fh_dentry);
168         if (src->fh_export)
169                 exp_get(src->fh_export);
170         *dst = *src;
171 }
172
173 static __be32
174 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
175 {
176         __be32 status;
177
178         if (open->op_truncate &&
179                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
180                 return nfserr_inval;
181
182         accmode |= NFSD_MAY_READ_IF_EXEC;
183
184         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
185                 accmode |= NFSD_MAY_READ;
186         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
187                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
188         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
189                 accmode |= NFSD_MAY_WRITE;
190
191         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
192
193         return status;
194 }
195
196 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
197 {
198         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
199
200         if (S_ISREG(mode))
201                 return nfs_ok;
202         if (S_ISDIR(mode))
203                 return nfserr_isdir;
204         /*
205          * Using err_symlink as our catch-all case may look odd; but
206          * there's no other obvious error for this case in 4.0, and we
207          * happen to know that it will cause the linux v4 client to do
208          * the right thing on attempts to open something other than a
209          * regular file.
210          */
211         return nfserr_symlink;
212 }
213
214 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
215 {
216         if (nfsd4_has_session(cstate))
217                 return;
218         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
219                         &resfh->fh_handle);
220 }
221
222 static __be32
223 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
224 {
225         struct svc_fh *current_fh = &cstate->current_fh;
226         int accmode;
227         __be32 status;
228
229         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
230         if (!*resfh)
231                 return nfserr_jukebox;
232         fh_init(*resfh, NFS4_FHSIZE);
233         open->op_truncate = 0;
234
235         if (open->op_create) {
236                 /* FIXME: check session persistence and pnfs flags.
237                  * The nfsv4.1 spec requires the following semantics:
238                  *
239                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
240                  * Reply Cache  | server |                 |
241                  * -------------+--------+-----------------+--------------------
242                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
243                  *              |        |                 | (SHOULD)
244                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
245                  *              |        |                 | (SHOULD NOT)
246                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
247                  * yes          | no     | GUARDED4        | GUARDED4
248                  * yes          | yes    | GUARDED4        | GUARDED4
249                  */
250
251                 /*
252                  * Note: create modes (UNCHECKED,GUARDED...) are the same
253                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
254                  */
255                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
256                                         open->op_fname.len, &open->op_iattr,
257                                         *resfh, open->op_createmode,
258                                         (u32 *)open->op_verf.data,
259                                         &open->op_truncate, &open->op_created);
260
261                 if (!status && open->op_label.len)
262                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
263
264                 /*
265                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
266                  * use the returned bitmask to indicate which attributes
267                  * we used to store the verifier:
268                  */
269                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
270                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
271                                                 FATTR4_WORD1_TIME_MODIFY);
272         } else
273                 /*
274                  * Note this may exit with the parent still locked.
275                  * We will hold the lock until nfsd4_open's final
276                  * lookup, to prevent renames or unlinks until we've had
277                  * a chance to an acquire a delegation if appropriate.
278                  */
279                 status = nfsd_lookup(rqstp, current_fh,
280                                      open->op_fname.data, open->op_fname.len, *resfh);
281         if (status)
282                 goto out;
283         status = nfsd_check_obj_isreg(*resfh);
284         if (status)
285                 goto out;
286
287         if (is_create_with_attrs(open) && open->op_acl != NULL)
288                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
289
290         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
291         accmode = NFSD_MAY_NOP;
292         if (open->op_created ||
293                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
294                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
295         status = do_open_permission(rqstp, *resfh, open, accmode);
296         set_change_info(&open->op_cinfo, current_fh);
297 out:
298         return status;
299 }
300
301 static __be32
302 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
303 {
304         struct svc_fh *current_fh = &cstate->current_fh;
305         __be32 status;
306         int accmode = 0;
307
308         /* We don't know the target directory, and therefore can not
309         * set the change info
310         */
311
312         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
313
314         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
315
316         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
317                 (open->op_iattr.ia_size == 0);
318         /*
319          * In the delegation case, the client is telling us about an
320          * open that it *already* performed locally, some time ago.  We
321          * should let it succeed now if possible.
322          *
323          * In the case of a CLAIM_FH open, on the other hand, the client
324          * may be counting on us to enforce permissions (the Linux 4.1
325          * client uses this for normal opens, for example).
326          */
327         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
328                 accmode = NFSD_MAY_OWNER_OVERRIDE;
329
330         status = do_open_permission(rqstp, current_fh, open, accmode);
331
332         return status;
333 }
334
335 static void
336 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
337 {
338         struct nfsd4_sessionid *sid =
339                         (struct nfsd4_sessionid *)session->se_sessionid.data;
340
341         clid->cl_boot = sid->clientid.cl_boot;
342         clid->cl_id = sid->clientid.cl_id;
343 }
344
345 static __be32
346 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
347            union nfsd4_op_u *u)
348 {
349         struct nfsd4_open *open = &u->open;
350         __be32 status;
351         struct svc_fh *resfh = NULL;
352         struct net *net = SVC_NET(rqstp);
353         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
354
355         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
356                 (int)open->op_fname.len, open->op_fname.data,
357                 open->op_openowner);
358
359         /* This check required by spec. */
360         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
361                 return nfserr_inval;
362
363         open->op_created = 0;
364         /*
365          * RFC5661 18.51.3
366          * Before RECLAIM_COMPLETE done, server should deny new lock
367          */
368         if (nfsd4_has_session(cstate) &&
369             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
370                       &cstate->session->se_client->cl_flags) &&
371             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
372                 return nfserr_grace;
373
374         if (nfsd4_has_session(cstate))
375                 copy_clientid(&open->op_clientid, cstate->session);
376
377         /* check seqid for replay. set nfs4_owner */
378         status = nfsd4_process_open1(cstate, open, nn);
379         if (status == nfserr_replay_me) {
380                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
381                 fh_put(&cstate->current_fh);
382                 fh_copy_shallow(&cstate->current_fh.fh_handle,
383                                 &rp->rp_openfh);
384                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
385                 if (status)
386                         dprintk("nfsd4_open: replay failed"
387                                 " restoring previous filehandle\n");
388                 else
389                         status = nfserr_replay_me;
390         }
391         if (status)
392                 goto out;
393         if (open->op_xdr_error) {
394                 status = open->op_xdr_error;
395                 goto out;
396         }
397
398         status = nfsd4_check_open_attributes(rqstp, cstate, open);
399         if (status)
400                 goto out;
401
402         /* Openowner is now set, so sequence id will get bumped.  Now we need
403          * these checks before we do any creates: */
404         status = nfserr_grace;
405         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
406                 goto out;
407         status = nfserr_no_grace;
408         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
409                 goto out;
410
411         switch (open->op_claim_type) {
412                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
413                 case NFS4_OPEN_CLAIM_NULL:
414                         status = do_open_lookup(rqstp, cstate, open, &resfh);
415                         if (status)
416                                 goto out;
417                         break;
418                 case NFS4_OPEN_CLAIM_PREVIOUS:
419                         status = nfs4_check_open_reclaim(&open->op_clientid,
420                                                          cstate, nn);
421                         if (status)
422                                 goto out;
423                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
424                 case NFS4_OPEN_CLAIM_FH:
425                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
426                         status = do_open_fhandle(rqstp, cstate, open);
427                         if (status)
428                                 goto out;
429                         resfh = &cstate->current_fh;
430                         break;
431                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
432                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
433                         dprintk("NFSD: unsupported OPEN claim type %d\n",
434                                 open->op_claim_type);
435                         status = nfserr_notsupp;
436                         goto out;
437                 default:
438                         dprintk("NFSD: Invalid OPEN claim type %d\n",
439                                 open->op_claim_type);
440                         status = nfserr_inval;
441                         goto out;
442         }
443         /*
444          * nfsd4_process_open2() does the actual opening of the file.  If
445          * successful, it (1) truncates the file if open->op_truncate was
446          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
447          */
448         status = nfsd4_process_open2(rqstp, resfh, open);
449         WARN(status && open->op_created,
450              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
451              be32_to_cpu(status));
452 out:
453         if (resfh && resfh != &cstate->current_fh) {
454                 fh_dup2(&cstate->current_fh, resfh);
455                 fh_put(resfh);
456                 kfree(resfh);
457         }
458         nfsd4_cleanup_open_state(cstate, open);
459         nfsd4_bump_seqid(cstate, status);
460         return status;
461 }
462
463 /*
464  * OPEN is the only seqid-mutating operation whose decoding can fail
465  * with a seqid-mutating error (specifically, decoding of user names in
466  * the attributes).  Therefore we have to do some processing to look up
467  * the stateowner so that we can bump the seqid.
468  */
469 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
470 {
471         struct nfsd4_open *open = &op->u.open;
472
473         if (!seqid_mutating_err(ntohl(op->status)))
474                 return op->status;
475         if (nfsd4_has_session(cstate))
476                 return op->status;
477         open->op_xdr_error = op->status;
478         return nfsd4_open(rqstp, cstate, &op->u);
479 }
480
481 /*
482  * filehandle-manipulating ops.
483  */
484 static __be32
485 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
486             union nfsd4_op_u *u)
487 {
488         u->getfh = &cstate->current_fh;
489         return nfs_ok;
490 }
491
492 static __be32
493 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
494             union nfsd4_op_u *u)
495 {
496         struct nfsd4_putfh *putfh = &u->putfh;
497
498         fh_put(&cstate->current_fh);
499         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
500         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
501                putfh->pf_fhlen);
502         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
503 }
504
505 static __be32
506 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
507                 union nfsd4_op_u *u)
508 {
509         __be32 status;
510
511         fh_put(&cstate->current_fh);
512         status = exp_pseudoroot(rqstp, &cstate->current_fh);
513         return status;
514 }
515
516 static __be32
517 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
518                 union nfsd4_op_u *u)
519 {
520         if (!cstate->save_fh.fh_dentry)
521                 return nfserr_restorefh;
522
523         fh_dup2(&cstate->current_fh, &cstate->save_fh);
524         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
525                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
526                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
527         }
528         return nfs_ok;
529 }
530
531 static __be32
532 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
533              union nfsd4_op_u *u)
534 {
535         fh_dup2(&cstate->save_fh, &cstate->current_fh);
536         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
537                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
538                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
539         }
540         return nfs_ok;
541 }
542
543 /*
544  * misc nfsv4 ops
545  */
546 static __be32
547 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
548              union nfsd4_op_u *u)
549 {
550         struct nfsd4_access *access = &u->access;
551
552         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
553                 return nfserr_inval;
554
555         access->ac_resp_access = access->ac_req_access;
556         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
557                            &access->ac_supported);
558 }
559
560 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
561 {
562         __be32 verf[2];
563         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
564
565         /*
566          * This is opaque to client, so no need to byte-swap. Use
567          * __force to keep sparse happy. y2038 time_t overflow is
568          * irrelevant in this usage.
569          */
570         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
571         verf[1] = (__force __be32)nn->nfssvc_boot.tv_nsec;
572         memcpy(verifier->data, verf, sizeof(verifier->data));
573 }
574
575 static __be32
576 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
577              union nfsd4_op_u *u)
578 {
579         struct nfsd4_commit *commit = &u->commit;
580
581         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
582         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
583                              commit->co_count);
584 }
585
586 static __be32
587 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
588              union nfsd4_op_u *u)
589 {
590         struct nfsd4_create *create = &u->create;
591         struct svc_fh resfh;
592         __be32 status;
593         dev_t rdev;
594
595         fh_init(&resfh, NFS4_FHSIZE);
596
597         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
598         if (status)
599                 return status;
600
601         status = check_attr_support(rqstp, cstate, create->cr_bmval,
602                                     nfsd_attrmask);
603         if (status)
604                 return status;
605
606         switch (create->cr_type) {
607         case NF4LNK:
608                 status = nfsd_symlink(rqstp, &cstate->current_fh,
609                                       create->cr_name, create->cr_namelen,
610                                       create->cr_data, &resfh);
611                 break;
612
613         case NF4BLK:
614                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
615                 if (MAJOR(rdev) != create->cr_specdata1 ||
616                     MINOR(rdev) != create->cr_specdata2)
617                         return nfserr_inval;
618                 status = nfsd_create(rqstp, &cstate->current_fh,
619                                      create->cr_name, create->cr_namelen,
620                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
621                 break;
622
623         case NF4CHR:
624                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
625                 if (MAJOR(rdev) != create->cr_specdata1 ||
626                     MINOR(rdev) != create->cr_specdata2)
627                         return nfserr_inval;
628                 status = nfsd_create(rqstp, &cstate->current_fh,
629                                      create->cr_name, create->cr_namelen,
630                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
631                 break;
632
633         case NF4SOCK:
634                 status = nfsd_create(rqstp, &cstate->current_fh,
635                                      create->cr_name, create->cr_namelen,
636                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
637                 break;
638
639         case NF4FIFO:
640                 status = nfsd_create(rqstp, &cstate->current_fh,
641                                      create->cr_name, create->cr_namelen,
642                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
643                 break;
644
645         case NF4DIR:
646                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
647                 status = nfsd_create(rqstp, &cstate->current_fh,
648                                      create->cr_name, create->cr_namelen,
649                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
650                 break;
651
652         default:
653                 status = nfserr_badtype;
654         }
655
656         if (status)
657                 goto out;
658
659         if (create->cr_label.len)
660                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
661
662         if (create->cr_acl != NULL)
663                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
664                                 create->cr_bmval);
665
666         fh_unlock(&cstate->current_fh);
667         set_change_info(&create->cr_cinfo, &cstate->current_fh);
668         fh_dup2(&cstate->current_fh, &resfh);
669 out:
670         fh_put(&resfh);
671         return status;
672 }
673
674 static __be32
675 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
676               union nfsd4_op_u *u)
677 {
678         struct nfsd4_getattr *getattr = &u->getattr;
679         __be32 status;
680
681         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
682         if (status)
683                 return status;
684
685         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
686                 return nfserr_inval;
687
688         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
689         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
690         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
691
692         getattr->ga_fhp = &cstate->current_fh;
693         return nfs_ok;
694 }
695
696 static __be32
697 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
698            union nfsd4_op_u *u)
699 {
700         struct nfsd4_link *link = &u->link;
701         __be32 status;
702
703         status = nfsd_link(rqstp, &cstate->current_fh,
704                            link->li_name, link->li_namelen, &cstate->save_fh);
705         if (!status)
706                 set_change_info(&link->li_cinfo, &cstate->current_fh);
707         return status;
708 }
709
710 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
711 {
712         struct svc_fh tmp_fh;
713         __be32 ret;
714
715         fh_init(&tmp_fh, NFS4_FHSIZE);
716         ret = exp_pseudoroot(rqstp, &tmp_fh);
717         if (ret)
718                 return ret;
719         if (tmp_fh.fh_dentry == fh->fh_dentry) {
720                 fh_put(&tmp_fh);
721                 return nfserr_noent;
722         }
723         fh_put(&tmp_fh);
724         return nfsd_lookup(rqstp, fh, "..", 2, fh);
725 }
726
727 static __be32
728 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
729               union nfsd4_op_u *u)
730 {
731         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
732 }
733
734 static __be32
735 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
736              union nfsd4_op_u *u)
737 {
738         return nfsd_lookup(rqstp, &cstate->current_fh,
739                            u->lookup.lo_name, u->lookup.lo_len,
740                            &cstate->current_fh);
741 }
742
743 static __be32
744 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
745            union nfsd4_op_u *u)
746 {
747         struct nfsd4_read *read = &u->read;
748         __be32 status;
749
750         read->rd_filp = NULL;
751         if (read->rd_offset >= OFFSET_MAX)
752                 return nfserr_inval;
753
754         /*
755          * If we do a zero copy read, then a client will see read data
756          * that reflects the state of the file *after* performing the
757          * following compound.
758          *
759          * To ensure proper ordering, we therefore turn off zero copy if
760          * the client wants us to do more in this compound:
761          */
762         if (!nfsd4_last_compound_op(rqstp))
763                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
764
765         /* check stateid */
766         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
767                                         &read->rd_stateid, RD_STATE,
768                                         &read->rd_filp, &read->rd_tmp_file);
769         if (status) {
770                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
771                 goto out;
772         }
773         status = nfs_ok;
774 out:
775         read->rd_rqstp = rqstp;
776         read->rd_fhp = &cstate->current_fh;
777         return status;
778 }
779
780
781 static void
782 nfsd4_read_release(union nfsd4_op_u *u)
783 {
784         if (u->read.rd_filp)
785                 fput(u->read.rd_filp);
786 }
787
788 static __be32
789 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
790               union nfsd4_op_u *u)
791 {
792         struct nfsd4_readdir *readdir = &u->readdir;
793         u64 cookie = readdir->rd_cookie;
794         static const nfs4_verifier zeroverf;
795
796         /* no need to check permission - this will be done in nfsd_readdir() */
797
798         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
799                 return nfserr_inval;
800
801         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
802         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
803         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
804
805         if ((cookie == 1) || (cookie == 2) ||
806             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
807                 return nfserr_bad_cookie;
808
809         readdir->rd_rqstp = rqstp;
810         readdir->rd_fhp = &cstate->current_fh;
811         return nfs_ok;
812 }
813
814 static __be32
815 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
816                union nfsd4_op_u *u)
817 {
818         u->readlink.rl_rqstp = rqstp;
819         u->readlink.rl_fhp = &cstate->current_fh;
820         return nfs_ok;
821 }
822
823 static __be32
824 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
825              union nfsd4_op_u *u)
826 {
827         struct nfsd4_remove *remove = &u->remove;
828         __be32 status;
829
830         if (opens_in_grace(SVC_NET(rqstp)))
831                 return nfserr_grace;
832         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
833                              remove->rm_name, remove->rm_namelen);
834         if (!status) {
835                 fh_unlock(&cstate->current_fh);
836                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
837         }
838         return status;
839 }
840
841 static __be32
842 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
843              union nfsd4_op_u *u)
844 {
845         struct nfsd4_rename *rename = &u->rename;
846         __be32 status;
847
848         if (opens_in_grace(SVC_NET(rqstp)) &&
849                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
850                 return nfserr_grace;
851         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
852                              rename->rn_snamelen, &cstate->current_fh,
853                              rename->rn_tname, rename->rn_tnamelen);
854         if (status)
855                 return status;
856         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
857         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
858         return nfs_ok;
859 }
860
861 static __be32
862 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
863               union nfsd4_op_u *u)
864 {
865         struct nfsd4_secinfo *secinfo = &u->secinfo;
866         struct svc_export *exp;
867         struct dentry *dentry;
868         __be32 err;
869
870         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
871         if (err)
872                 return err;
873         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
874                                     secinfo->si_name, secinfo->si_namelen,
875                                     &exp, &dentry);
876         if (err)
877                 return err;
878         fh_unlock(&cstate->current_fh);
879         if (d_really_is_negative(dentry)) {
880                 exp_put(exp);
881                 err = nfserr_noent;
882         } else
883                 secinfo->si_exp = exp;
884         dput(dentry);
885         if (cstate->minorversion)
886                 /* See rfc 5661 section 2.6.3.1.1.8 */
887                 fh_put(&cstate->current_fh);
888         return err;
889 }
890
891 static __be32
892 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
893                 union nfsd4_op_u *u)
894 {
895         __be32 err;
896
897         switch (u->secinfo_no_name.sin_style) {
898         case NFS4_SECINFO_STYLE4_CURRENT_FH:
899                 break;
900         case NFS4_SECINFO_STYLE4_PARENT:
901                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
902                 if (err)
903                         return err;
904                 break;
905         default:
906                 return nfserr_inval;
907         }
908
909         u->secinfo_no_name.sin_exp = exp_get(cstate->current_fh.fh_export);
910         fh_put(&cstate->current_fh);
911         return nfs_ok;
912 }
913
914 static void
915 nfsd4_secinfo_release(union nfsd4_op_u *u)
916 {
917         if (u->secinfo.si_exp)
918                 exp_put(u->secinfo.si_exp);
919 }
920
921 static __be32
922 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
923               union nfsd4_op_u *u)
924 {
925         struct nfsd4_setattr *setattr = &u->setattr;
926         __be32 status = nfs_ok;
927         int err;
928
929         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
930                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
931                                 &cstate->current_fh, &setattr->sa_stateid,
932                                 WR_STATE, NULL, NULL);
933                 if (status) {
934                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
935                         return status;
936                 }
937         }
938         err = fh_want_write(&cstate->current_fh);
939         if (err)
940                 return nfserrno(err);
941         status = nfs_ok;
942
943         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
944                                     nfsd_attrmask);
945         if (status)
946                 goto out;
947
948         if (setattr->sa_acl != NULL)
949                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
950                                             setattr->sa_acl);
951         if (status)
952                 goto out;
953         if (setattr->sa_label.len)
954                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
955                                 &setattr->sa_label);
956         if (status)
957                 goto out;
958         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
959                                 0, (time_t)0);
960 out:
961         fh_drop_write(&cstate->current_fh);
962         return status;
963 }
964
965 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
966 {
967         int i = 1;
968         int buflen = write->wr_buflen;
969
970         vec[0].iov_base = write->wr_head.iov_base;
971         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
972         buflen -= vec[0].iov_len;
973
974         while (buflen) {
975                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
976                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
977                 buflen -= vec[i].iov_len;
978                 i++;
979         }
980         return i;
981 }
982
983 static __be32
984 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
985             union nfsd4_op_u *u)
986 {
987         struct nfsd4_write *write = &u->write;
988         stateid_t *stateid = &write->wr_stateid;
989         struct file *filp = NULL;
990         __be32 status = nfs_ok;
991         unsigned long cnt;
992         int nvecs;
993
994         if (write->wr_offset >= OFFSET_MAX)
995                 return nfserr_inval;
996
997         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
998                                                 stateid, WR_STATE, &filp, NULL);
999         if (status) {
1000                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
1001                 return status;
1002         }
1003
1004         cnt = write->wr_buflen;
1005         write->wr_how_written = write->wr_stable_how;
1006         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1007
1008         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1009         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1010
1011         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
1012                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
1013                                 write->wr_how_written);
1014         fput(filp);
1015
1016         write->wr_bytes_written = cnt;
1017
1018         return status;
1019 }
1020
1021 static __be32
1022 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1023                   stateid_t *src_stateid, struct file **src,
1024                   stateid_t *dst_stateid, struct file **dst)
1025 {
1026         __be32 status;
1027
1028         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1029                                             src_stateid, RD_STATE, src, NULL);
1030         if (status) {
1031                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1032                 goto out;
1033         }
1034
1035         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1036                                             dst_stateid, WR_STATE, dst, NULL);
1037         if (status) {
1038                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1039                 goto out_put_src;
1040         }
1041
1042         /* fix up for NFS-specific error code */
1043         if (!S_ISREG(file_inode(*src)->i_mode) ||
1044             !S_ISREG(file_inode(*dst)->i_mode)) {
1045                 status = nfserr_wrong_type;
1046                 goto out_put_dst;
1047         }
1048
1049 out:
1050         return status;
1051 out_put_dst:
1052         fput(*dst);
1053 out_put_src:
1054         fput(*src);
1055         goto out;
1056 }
1057
1058 static __be32
1059 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1060                 union nfsd4_op_u *u)
1061 {
1062         struct nfsd4_clone *clone = &u->clone;
1063         struct file *src, *dst;
1064         __be32 status;
1065
1066         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1067                                    &clone->cl_dst_stateid, &dst);
1068         if (status)
1069                 goto out;
1070
1071         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1072                         dst, clone->cl_dst_pos, clone->cl_count);
1073
1074         fput(dst);
1075         fput(src);
1076 out:
1077         return status;
1078 }
1079
1080 static __be32
1081 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1082                 union nfsd4_op_u *u)
1083 {
1084         struct nfsd4_copy *copy = &u->copy;
1085         struct file *src, *dst;
1086         __be32 status;
1087         ssize_t bytes;
1088
1089         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1090                                    &copy->cp_dst_stateid, &dst);
1091         if (status)
1092                 goto out;
1093
1094         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1095                         dst, copy->cp_dst_pos, copy->cp_count);
1096
1097         if (bytes < 0)
1098                 status = nfserrno(bytes);
1099         else {
1100                 copy->cp_res.wr_bytes_written = bytes;
1101                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1102                 copy->cp_consecutive = 1;
1103                 copy->cp_synchronous = 1;
1104                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1105                 status = nfs_ok;
1106         }
1107
1108         fput(src);
1109         fput(dst);
1110 out:
1111         return status;
1112 }
1113
1114 static __be32
1115 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1116                 struct nfsd4_fallocate *fallocate, int flags)
1117 {
1118         __be32 status = nfserr_notsupp;
1119         struct file *file;
1120
1121         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1122                                             &fallocate->falloc_stateid,
1123                                             WR_STATE, &file, NULL);
1124         if (status != nfs_ok) {
1125                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1126                 return status;
1127         }
1128
1129         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1130                                      fallocate->falloc_offset,
1131                                      fallocate->falloc_length,
1132                                      flags);
1133         fput(file);
1134         return status;
1135 }
1136
1137 static __be32
1138 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1139                union nfsd4_op_u *u)
1140 {
1141         return nfsd4_fallocate(rqstp, cstate, &u->allocate, 0);
1142 }
1143
1144 static __be32
1145 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1146                  union nfsd4_op_u *u)
1147 {
1148         return nfsd4_fallocate(rqstp, cstate, &u->deallocate,
1149                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1150 }
1151
1152 static __be32
1153 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1154            union nfsd4_op_u *u)
1155 {
1156         struct nfsd4_seek *seek = &u->seek;
1157         int whence;
1158         __be32 status;
1159         struct file *file;
1160
1161         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1162                                             &seek->seek_stateid,
1163                                             RD_STATE, &file, NULL);
1164         if (status) {
1165                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1166                 return status;
1167         }
1168
1169         switch (seek->seek_whence) {
1170         case NFS4_CONTENT_DATA:
1171                 whence = SEEK_DATA;
1172                 break;
1173         case NFS4_CONTENT_HOLE:
1174                 whence = SEEK_HOLE;
1175                 break;
1176         default:
1177                 status = nfserr_union_notsupp;
1178                 goto out;
1179         }
1180
1181         /*
1182          * Note:  This call does change file->f_pos, but nothing in NFSD
1183          *        should ever file->f_pos.
1184          */
1185         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1186         if (seek->seek_pos < 0)
1187                 status = nfserrno(seek->seek_pos);
1188         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1189                 seek->seek_eof = true;
1190
1191 out:
1192         fput(file);
1193         return status;
1194 }
1195
1196 /* This routine never returns NFS_OK!  If there are no other errors, it
1197  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1198  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1199  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1200  */
1201 static __be32
1202 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1203              struct nfsd4_verify *verify)
1204 {
1205         __be32 *buf, *p;
1206         int count;
1207         __be32 status;
1208
1209         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1210         if (status)
1211                 return status;
1212
1213         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1214         if (status)
1215                 return status;
1216
1217         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1218             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1219                 return nfserr_inval;
1220         if (verify->ve_attrlen & 3)
1221                 return nfserr_inval;
1222
1223         /* count in words:
1224          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1225          */
1226         count = 4 + (verify->ve_attrlen >> 2);
1227         buf = kmalloc(count << 2, GFP_KERNEL);
1228         if (!buf)
1229                 return nfserr_jukebox;
1230
1231         p = buf;
1232         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1233                                     cstate->current_fh.fh_export,
1234                                     cstate->current_fh.fh_dentry,
1235                                     verify->ve_bmval,
1236                                     rqstp, 0);
1237         /*
1238          * If nfsd4_encode_fattr() ran out of space, assume that's because
1239          * the attributes are longer (hence different) than those given:
1240          */
1241         if (status == nfserr_resource)
1242                 status = nfserr_not_same;
1243         if (status)
1244                 goto out_kfree;
1245
1246         /* skip bitmap */
1247         p = buf + 1 + ntohl(buf[0]);
1248         status = nfserr_not_same;
1249         if (ntohl(*p++) != verify->ve_attrlen)
1250                 goto out_kfree;
1251         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1252                 status = nfserr_same;
1253
1254 out_kfree:
1255         kfree(buf);
1256         return status;
1257 }
1258
1259 static __be32
1260 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1261               union nfsd4_op_u *u)
1262 {
1263         __be32 status;
1264
1265         status = _nfsd4_verify(rqstp, cstate, &u->verify);
1266         return status == nfserr_not_same ? nfs_ok : status;
1267 }
1268
1269 static __be32
1270 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1271              union nfsd4_op_u *u)
1272 {
1273         __be32 status;
1274
1275         status = _nfsd4_verify(rqstp, cstate, &u->nverify);
1276         return status == nfserr_same ? nfs_ok : status;
1277 }
1278
1279 #ifdef CONFIG_NFSD_PNFS
1280 static const struct nfsd4_layout_ops *
1281 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1282 {
1283         if (!exp->ex_layout_types) {
1284                 dprintk("%s: export does not support pNFS\n", __func__);
1285                 return NULL;
1286         }
1287
1288         if (layout_type >= LAYOUT_TYPE_MAX ||
1289             !(exp->ex_layout_types & (1 << layout_type))) {
1290                 dprintk("%s: layout type %d not supported\n",
1291                         __func__, layout_type);
1292                 return NULL;
1293         }
1294
1295         return nfsd4_layout_ops[layout_type];
1296 }
1297
1298 static __be32
1299 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1300                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1301 {
1302         struct nfsd4_getdeviceinfo *gdp = &u->getdeviceinfo;
1303         const struct nfsd4_layout_ops *ops;
1304         struct nfsd4_deviceid_map *map;
1305         struct svc_export *exp;
1306         __be32 nfserr;
1307
1308         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1309                __func__,
1310                gdp->gd_layout_type,
1311                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1312                gdp->gd_maxcount);
1313
1314         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1315         if (!map) {
1316                 dprintk("%s: couldn't find device ID to export mapping!\n",
1317                         __func__);
1318                 return nfserr_noent;
1319         }
1320
1321         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1322         if (IS_ERR(exp)) {
1323                 dprintk("%s: could not find device id\n", __func__);
1324                 return nfserr_noent;
1325         }
1326
1327         nfserr = nfserr_layoutunavailable;
1328         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1329         if (!ops)
1330                 goto out;
1331
1332         nfserr = nfs_ok;
1333         if (gdp->gd_maxcount != 0) {
1334                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1335                                 rqstp, cstate->session->se_client, gdp);
1336         }
1337
1338         gdp->gd_notify_types &= ops->notify_types;
1339 out:
1340         exp_put(exp);
1341         return nfserr;
1342 }
1343
1344 static void
1345 nfsd4_getdeviceinfo_release(union nfsd4_op_u *u)
1346 {
1347         kfree(u->getdeviceinfo.gd_device);
1348 }
1349
1350 static __be32
1351 nfsd4_layoutget(struct svc_rqst *rqstp,
1352                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1353 {
1354         struct nfsd4_layoutget *lgp = &u->layoutget;
1355         struct svc_fh *current_fh = &cstate->current_fh;
1356         const struct nfsd4_layout_ops *ops;
1357         struct nfs4_layout_stateid *ls;
1358         __be32 nfserr;
1359         int accmode;
1360
1361         switch (lgp->lg_seg.iomode) {
1362         case IOMODE_READ:
1363                 accmode = NFSD_MAY_READ;
1364                 break;
1365         case IOMODE_RW:
1366                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1367                 break;
1368         default:
1369                 dprintk("%s: invalid iomode %d\n",
1370                         __func__, lgp->lg_seg.iomode);
1371                 nfserr = nfserr_badiomode;
1372                 goto out;
1373         }
1374
1375         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1376         if (nfserr)
1377                 goto out;
1378
1379         nfserr = nfserr_layoutunavailable;
1380         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1381         if (!ops)
1382                 goto out;
1383
1384         /*
1385          * Verify minlength and range as per RFC5661:
1386          *  o  If loga_length is less than loga_minlength,
1387          *     the metadata server MUST return NFS4ERR_INVAL.
1388          *  o  If the sum of loga_offset and loga_minlength exceeds
1389          *     NFS4_UINT64_MAX, and loga_minlength is not
1390          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1391          *  o  If the sum of loga_offset and loga_length exceeds
1392          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1393          *     the error NFS4ERR_INVAL MUST result.
1394          */
1395         nfserr = nfserr_inval;
1396         if (lgp->lg_seg.length < lgp->lg_minlength ||
1397             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1398              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1399             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1400              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1401                 goto out;
1402         if (lgp->lg_seg.length == 0)
1403                 goto out;
1404
1405         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1406                                                 true, lgp->lg_layout_type, &ls);
1407         if (nfserr) {
1408                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1409                 goto out;
1410         }
1411
1412         nfserr = nfserr_recallconflict;
1413         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1414                 goto out_put_stid;
1415
1416         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1417                                      current_fh, lgp);
1418         if (nfserr)
1419                 goto out_put_stid;
1420
1421         nfserr = nfsd4_insert_layout(lgp, ls);
1422
1423 out_put_stid:
1424         mutex_unlock(&ls->ls_mutex);
1425         nfs4_put_stid(&ls->ls_stid);
1426 out:
1427         return nfserr;
1428 }
1429
1430 static void
1431 nfsd4_layoutget_release(union nfsd4_op_u *u)
1432 {
1433         kfree(u->layoutget.lg_content);
1434 }
1435
1436 static __be32
1437 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1438                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1439 {
1440         struct nfsd4_layoutcommit *lcp = &u->layoutcommit;
1441         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1442         struct svc_fh *current_fh = &cstate->current_fh;
1443         const struct nfsd4_layout_ops *ops;
1444         loff_t new_size = lcp->lc_last_wr + 1;
1445         struct inode *inode;
1446         struct nfs4_layout_stateid *ls;
1447         __be32 nfserr;
1448
1449         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1450         if (nfserr)
1451                 goto out;
1452
1453         nfserr = nfserr_layoutunavailable;
1454         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1455         if (!ops)
1456                 goto out;
1457         inode = d_inode(current_fh->fh_dentry);
1458
1459         nfserr = nfserr_inval;
1460         if (new_size <= seg->offset) {
1461                 dprintk("pnfsd: last write before layout segment\n");
1462                 goto out;
1463         }
1464         if (new_size > seg->offset + seg->length) {
1465                 dprintk("pnfsd: last write beyond layout segment\n");
1466                 goto out;
1467         }
1468         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1469                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1470                 goto out;
1471         }
1472
1473         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1474                                                 false, lcp->lc_layout_type,
1475                                                 &ls);
1476         if (nfserr) {
1477                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1478                 /* fixup error code as per RFC5661 */
1479                 if (nfserr == nfserr_bad_stateid)
1480                         nfserr = nfserr_badlayout;
1481                 goto out;
1482         }
1483
1484         /* LAYOUTCOMMIT does not require any serialization */
1485         mutex_unlock(&ls->ls_mutex);
1486
1487         if (new_size > i_size_read(inode)) {
1488                 lcp->lc_size_chg = 1;
1489                 lcp->lc_newsize = new_size;
1490         } else {
1491                 lcp->lc_size_chg = 0;
1492         }
1493
1494         nfserr = ops->proc_layoutcommit(inode, lcp);
1495         nfs4_put_stid(&ls->ls_stid);
1496 out:
1497         return nfserr;
1498 }
1499
1500 static __be32
1501 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1502                 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
1503 {
1504         struct nfsd4_layoutreturn *lrp = &u->layoutreturn;
1505         struct svc_fh *current_fh = &cstate->current_fh;
1506         __be32 nfserr;
1507
1508         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1509         if (nfserr)
1510                 goto out;
1511
1512         nfserr = nfserr_layoutunavailable;
1513         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1514                 goto out;
1515
1516         switch (lrp->lr_seg.iomode) {
1517         case IOMODE_READ:
1518         case IOMODE_RW:
1519         case IOMODE_ANY:
1520                 break;
1521         default:
1522                 dprintk("%s: invalid iomode %d\n", __func__,
1523                         lrp->lr_seg.iomode);
1524                 nfserr = nfserr_inval;
1525                 goto out;
1526         }
1527
1528         switch (lrp->lr_return_type) {
1529         case RETURN_FILE:
1530                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1531                 break;
1532         case RETURN_FSID:
1533         case RETURN_ALL:
1534                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1535                 break;
1536         default:
1537                 dprintk("%s: invalid return_type %d\n", __func__,
1538                         lrp->lr_return_type);
1539                 nfserr = nfserr_inval;
1540                 break;
1541         }
1542 out:
1543         return nfserr;
1544 }
1545 #endif /* CONFIG_NFSD_PNFS */
1546
1547 /*
1548  * NULL call.
1549  */
1550 static __be32
1551 nfsd4_proc_null(struct svc_rqst *rqstp)
1552 {
1553         return nfs_ok;
1554 }
1555
1556 static inline void nfsd4_increment_op_stats(u32 opnum)
1557 {
1558         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1559                 nfsdstats.nfs4_opcount[opnum]++;
1560 }
1561
1562 static const struct nfsd4_operation nfsd4_ops[];
1563
1564 static const char *nfsd4_op_name(unsigned opnum);
1565
1566 /*
1567  * Enforce NFSv4.1 COMPOUND ordering rules:
1568  *
1569  * Also note, enforced elsewhere:
1570  *      - SEQUENCE other than as first op results in
1571  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1572  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1573  *        (Enforced in nfsd4_bind_conn_to_session().)
1574  *      - DESTROY_SESSION must be the final operation in a compound, if
1575  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1576  *        (Enforced in nfsd4_destroy_session().)
1577  */
1578 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1579 {
1580         struct nfsd4_op *op = &args->ops[0];
1581
1582         /* These ordering requirements don't apply to NFSv4.0: */
1583         if (args->minorversion == 0)
1584                 return nfs_ok;
1585         /* This is weird, but OK, not our problem: */
1586         if (args->opcnt == 0)
1587                 return nfs_ok;
1588         if (op->status == nfserr_op_illegal)
1589                 return nfs_ok;
1590         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1591                 return nfserr_op_not_in_session;
1592         if (op->opnum == OP_SEQUENCE)
1593                 return nfs_ok;
1594         if (args->opcnt != 1)
1595                 return nfserr_not_only_op;
1596         return nfs_ok;
1597 }
1598
1599 const struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1600 {
1601         return &nfsd4_ops[op->opnum];
1602 }
1603
1604 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1605 {
1606         if (op->opnum == OP_ILLEGAL)
1607                 return false;
1608         return OPDESC(op)->op_flags & OP_CACHEME;
1609 }
1610
1611 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1612 {
1613         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1614         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1615         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1616         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1617         const struct nfsd4_operation *thisd = OPDESC(this);
1618         const struct nfsd4_operation *nextd;
1619
1620         /*
1621          * Most ops check wronsec on our own; only the putfh-like ops
1622          * have special rules.
1623          */
1624         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1625                 return false;
1626         /*
1627          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1628          * put-filehandle operation if we're not going to use the
1629          * result:
1630          */
1631         if (argp->opcnt == resp->opcnt)
1632                 return false;
1633         if (next->opnum == OP_ILLEGAL)
1634                 return false;
1635         nextd = OPDESC(next);
1636         /*
1637          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1638          * errors themselves as necessary; others should check for them
1639          * now:
1640          */
1641         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1642 }
1643
1644 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1645                                struct nfsd4_compoundres *resp)
1646 {
1647         struct xdr_stream *xdr = &resp->xdr;
1648         struct xdr_buf *buf = &rqstp->rq_res;
1649         struct kvec *head = buf->head;
1650
1651         xdr->buf = buf;
1652         xdr->iov = head;
1653         xdr->p   = head->iov_base + head->iov_len;
1654         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1655         /* Tail and page_len should be zero at this point: */
1656         buf->len = buf->head[0].iov_len;
1657         xdr->scratch.iov_len = 0;
1658         xdr->page_ptr = buf->pages - 1;
1659         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1660                 - rqstp->rq_auth_slack;
1661 }
1662
1663 /*
1664  * COMPOUND call.
1665  */
1666 static __be32
1667 nfsd4_proc_compound(struct svc_rqst *rqstp)
1668 {
1669         struct nfsd4_compoundargs *args = rqstp->rq_argp;
1670         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1671         struct nfsd4_op *op;
1672         struct nfsd4_compound_state *cstate = &resp->cstate;
1673         struct svc_fh *current_fh = &cstate->current_fh;
1674         struct svc_fh *save_fh = &cstate->save_fh;
1675         __be32          status;
1676
1677         svcxdr_init_encode(rqstp, resp);
1678         resp->tagp = resp->xdr.p;
1679         /* reserve space for: taglen, tag, and opcnt */
1680         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1681         resp->taglen = args->taglen;
1682         resp->tag = args->tag;
1683         resp->rqstp = rqstp;
1684         cstate->minorversion = args->minorversion;
1685         fh_init(current_fh, NFS4_FHSIZE);
1686         fh_init(save_fh, NFS4_FHSIZE);
1687         /*
1688          * Don't use the deferral mechanism for NFSv4; compounds make it
1689          * too hard to avoid non-idempotency problems.
1690          */
1691         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1692
1693         /*
1694          * According to RFC3010, this takes precedence over all other errors.
1695          */
1696         status = nfserr_minor_vers_mismatch;
1697         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1698                 goto out;
1699
1700         status = nfs41_check_op_ordering(args);
1701         if (status) {
1702                 op = &args->ops[0];
1703                 op->status = status;
1704                 goto encode_op;
1705         }
1706
1707         while (!status && resp->opcnt < args->opcnt) {
1708                 op = &args->ops[resp->opcnt++];
1709
1710                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1711                         resp->opcnt, args->opcnt, op->opnum,
1712                         nfsd4_op_name(op->opnum));
1713                 /*
1714                  * The XDR decode routines may have pre-set op->status;
1715                  * for example, if there is a miscellaneous XDR error
1716                  * it will be set to nfserr_bad_xdr.
1717                  */
1718                 if (op->status) {
1719                         if (op->opnum == OP_OPEN)
1720                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1721                         goto encode_op;
1722                 }
1723
1724                 if (!current_fh->fh_dentry) {
1725                         if (!(op->opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1726                                 op->status = nfserr_nofilehandle;
1727                                 goto encode_op;
1728                         }
1729                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1730                           !(op->opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1731                         op->status = nfserr_moved;
1732                         goto encode_op;
1733                 }
1734
1735                 fh_clear_wcc(current_fh);
1736
1737                 /* If op is non-idempotent */
1738                 if (op->opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1739                         /*
1740                          * Don't execute this op if we couldn't encode a
1741                          * succesful reply:
1742                          */
1743                         u32 plen = op->opdesc->op_rsize_bop(rqstp, op);
1744                         /*
1745                          * Plus if there's another operation, make sure
1746                          * we'll have space to at least encode an error:
1747                          */
1748                         if (resp->opcnt < args->opcnt)
1749                                 plen += COMPOUND_ERR_SLACK_SPACE;
1750                         op->status = nfsd4_check_resp_size(resp, plen);
1751                 }
1752
1753                 if (op->status)
1754                         goto encode_op;
1755
1756                 if (op->opdesc->op_get_currentstateid)
1757                         op->opdesc->op_get_currentstateid(cstate, &op->u);
1758                 op->status = op->opdesc->op_func(rqstp, cstate, &op->u);
1759
1760                 /* Only from SEQUENCE */
1761                 if (cstate->status == nfserr_replay_cache) {
1762                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1763                         status = op->status;
1764                         goto out;
1765                 }
1766                 if (!op->status) {
1767                         if (op->opdesc->op_set_currentstateid)
1768                                 op->opdesc->op_set_currentstateid(cstate, &op->u);
1769
1770                         if (op->opdesc->op_flags & OP_CLEAR_STATEID)
1771                                 clear_current_stateid(cstate);
1772
1773                         if (need_wrongsec_check(rqstp))
1774                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1775                 }
1776 encode_op:
1777                 if (op->status == nfserr_replay_me) {
1778                         op->replay = &cstate->replay_owner->so_replay;
1779                         nfsd4_encode_replay(&resp->xdr, op);
1780                         status = op->status = op->replay->rp_status;
1781                 } else {
1782                         nfsd4_encode_operation(resp, op);
1783                         status = op->status;
1784                 }
1785
1786                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1787                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1788                         be32_to_cpu(status));
1789
1790                 nfsd4_cstate_clear_replay(cstate);
1791                 nfsd4_increment_op_stats(op->opnum);
1792         }
1793
1794         cstate->status = status;
1795         fh_put(current_fh);
1796         fh_put(save_fh);
1797         BUG_ON(cstate->replay_owner);
1798 out:
1799         /* Reset deferral mechanism for RPC deferrals */
1800         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1801         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1802         return status;
1803 }
1804
1805 #define op_encode_hdr_size              (2)
1806 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1807 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1808 #define op_encode_change_info_maxsz     (5)
1809 #define nfs4_fattr_bitmap_maxsz         (4)
1810
1811 /* We'll fall back on returning no lockowner if run out of space: */
1812 #define op_encode_lockowner_maxsz       (0)
1813 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1814
1815 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1816
1817 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1818 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1819                                          op_encode_ace_maxsz)
1820
1821 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1822
1823 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1824 {
1825         return (op_encode_hdr_size) * sizeof(__be32);
1826 }
1827
1828 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1829 {
1830         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1831 }
1832
1833 static inline u32 nfsd4_access_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1834 {
1835         /* ac_supported, ac_resp_access */
1836         return (op_encode_hdr_size + 2)* sizeof(__be32);
1837 }
1838
1839 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1840 {
1841         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1842 }
1843
1844 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1845 {
1846         return (op_encode_hdr_size + op_encode_change_info_maxsz
1847                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1848 }
1849
1850 /*
1851  * Note since this is an idempotent operation we won't insist on failing
1852  * the op prematurely if the estimate is too large.  We may turn off splice
1853  * reads unnecessarily.
1854  */
1855 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1856                                       struct nfsd4_op *op)
1857 {
1858         u32 *bmap = op->u.getattr.ga_bmval;
1859         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1860         u32 ret = 0;
1861
1862         if (bmap0 & FATTR4_WORD0_ACL)
1863                 return svc_max_payload(rqstp);
1864         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1865                 return svc_max_payload(rqstp);
1866
1867         if (bmap1 & FATTR4_WORD1_OWNER) {
1868                 ret += IDMAP_NAMESZ + 4;
1869                 bmap1 &= ~FATTR4_WORD1_OWNER;
1870         }
1871         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1872                 ret += IDMAP_NAMESZ + 4;
1873                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1874         }
1875         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1876                 ret += NFS4_FHSIZE + 4;
1877                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1878         }
1879         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1880                 ret += NFS4_MAXLABELLEN + 12;
1881                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1882         }
1883         /*
1884          * Largest of remaining attributes are 16 bytes (e.g.,
1885          * supported_attributes)
1886          */
1887         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1888         /* bitmask, length */
1889         ret += 20;
1890         return ret;
1891 }
1892
1893 static inline u32 nfsd4_getfh_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1894 {
1895         return (op_encode_hdr_size + 1) * sizeof(__be32) + NFS4_FHSIZE;
1896 }
1897
1898 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1899 {
1900         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1901                 * sizeof(__be32);
1902 }
1903
1904 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1905 {
1906         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1907                 * sizeof(__be32);
1908 }
1909
1910 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1911 {
1912         return (op_encode_hdr_size + op_encode_stateid_maxsz
1913                 + op_encode_change_info_maxsz + 1
1914                 + nfs4_fattr_bitmap_maxsz
1915                 + op_encode_delegation_maxsz) * sizeof(__be32);
1916 }
1917
1918 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1919 {
1920         u32 maxcount = 0, rlen = 0;
1921
1922         maxcount = svc_max_payload(rqstp);
1923         rlen = min(op->u.read.rd_length, maxcount);
1924
1925         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1926 }
1927
1928 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1929 {
1930         u32 maxcount = 0, rlen = 0;
1931
1932         maxcount = svc_max_payload(rqstp);
1933         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1934
1935         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1936                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1937 }
1938
1939 static inline u32 nfsd4_readlink_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1940 {
1941         return (op_encode_hdr_size + 1) * sizeof(__be32) + PAGE_SIZE;
1942 }
1943
1944 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1945 {
1946         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1947                 * sizeof(__be32);
1948 }
1949
1950 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1951 {
1952         return (op_encode_hdr_size + op_encode_change_info_maxsz
1953                 + op_encode_change_info_maxsz) * sizeof(__be32);
1954 }
1955
1956 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1957                                        struct nfsd4_op *op)
1958 {
1959         return (op_encode_hdr_size
1960                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1961 }
1962
1963 static inline u32 nfsd4_test_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1964 {
1965         return (op_encode_hdr_size + 1 + op->u.test_stateid.ts_num_ids)
1966                 * sizeof(__be32);
1967 }
1968
1969 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1970 {
1971         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1972 }
1973
1974 static inline u32 nfsd4_secinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1975 {
1976         return (op_encode_hdr_size + RPC_AUTH_MAXFLAVOR *
1977                 (4 + XDR_QUADLEN(GSS_OID_MAX_LEN))) * sizeof(__be32);
1978 }
1979
1980 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1981 {
1982         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1983                                                                 sizeof(__be32);
1984 }
1985
1986 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1987 {
1988         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1989 }
1990
1991 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1992 {
1993         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1994                 1 + 1 + /* eir_flags, spr_how */\
1995                 4 + /* spo_must_enforce & _allow with bitmap */\
1996                 2 + /*eir_server_owner.so_minor_id */\
1997                 /* eir_server_owner.so_major_id<> */\
1998                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1999                 /* eir_server_scope<> */\
2000                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
2001                 1 + /* eir_server_impl_id array length */\
2002                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
2003 }
2004
2005 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2006 {
2007         return (op_encode_hdr_size + \
2008                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
2009                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
2010 }
2011
2012 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2013 {
2014         return (op_encode_hdr_size + \
2015                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
2016                 2 + /* csr_sequence, csr_flags */\
2017                 op_encode_channel_attrs_maxsz + \
2018                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
2019 }
2020
2021 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2022 {
2023         return (op_encode_hdr_size +
2024                 1 /* wr_callback */ +
2025                 op_encode_stateid_maxsz /* wr_callback */ +
2026                 2 /* wr_count */ +
2027                 1 /* wr_committed */ +
2028                 op_encode_verifier_maxsz +
2029                 1 /* cr_consecutive */ +
2030                 1 /* cr_synchronous */) * sizeof(__be32);
2031 }
2032
2033 #ifdef CONFIG_NFSD_PNFS
2034 static inline u32 nfsd4_getdeviceinfo_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2035 {
2036         u32 maxcount = 0, rlen = 0;
2037
2038         maxcount = svc_max_payload(rqstp);
2039         rlen = min(op->u.getdeviceinfo.gd_maxcount, maxcount);
2040
2041         return (op_encode_hdr_size +
2042                 1 /* gd_layout_type*/ +
2043                 XDR_QUADLEN(rlen) +
2044                 2 /* gd_notify_types */) * sizeof(__be32);
2045 }
2046
2047 /*
2048  * At this stage we don't really know what layout driver will handle the request,
2049  * so we need to define an arbitrary upper bound here.
2050  */
2051 #define MAX_LAYOUT_SIZE         128
2052 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2053 {
2054         return (op_encode_hdr_size +
2055                 1 /* logr_return_on_close */ +
2056                 op_encode_stateid_maxsz +
2057                 1 /* nr of layouts */ +
2058                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2059 }
2060
2061 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2062 {
2063         return (op_encode_hdr_size +
2064                 1 /* locr_newsize */ +
2065                 2 /* ns_size */) * sizeof(__be32);
2066 }
2067
2068 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2069 {
2070         return (op_encode_hdr_size +
2071                 1 /* lrs_stateid */ +
2072                 op_encode_stateid_maxsz) * sizeof(__be32);
2073 }
2074 #endif /* CONFIG_NFSD_PNFS */
2075
2076
2077 static inline u32 nfsd4_seek_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2078 {
2079         return (op_encode_hdr_size + 3) * sizeof(__be32);
2080 }
2081
2082 static const struct nfsd4_operation nfsd4_ops[] = {
2083         [OP_ACCESS] = {
2084                 .op_func = nfsd4_access,
2085                 .op_name = "OP_ACCESS",
2086                 .op_rsize_bop = nfsd4_access_rsize,
2087         },
2088         [OP_CLOSE] = {
2089                 .op_func = nfsd4_close,
2090                 .op_flags = OP_MODIFIES_SOMETHING,
2091                 .op_name = "OP_CLOSE",
2092                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2093                 .op_get_currentstateid = nfsd4_get_closestateid,
2094                 .op_set_currentstateid = nfsd4_set_closestateid,
2095         },
2096         [OP_COMMIT] = {
2097                 .op_func = nfsd4_commit,
2098                 .op_flags = OP_MODIFIES_SOMETHING,
2099                 .op_name = "OP_COMMIT",
2100                 .op_rsize_bop = nfsd4_commit_rsize,
2101         },
2102         [OP_CREATE] = {
2103                 .op_func = nfsd4_create,
2104                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2105                 .op_name = "OP_CREATE",
2106                 .op_rsize_bop = nfsd4_create_rsize,
2107         },
2108         [OP_DELEGRETURN] = {
2109                 .op_func = nfsd4_delegreturn,
2110                 .op_flags = OP_MODIFIES_SOMETHING,
2111                 .op_name = "OP_DELEGRETURN",
2112                 .op_rsize_bop = nfsd4_only_status_rsize,
2113                 .op_get_currentstateid = nfsd4_get_delegreturnstateid,
2114         },
2115         [OP_GETATTR] = {
2116                 .op_func = nfsd4_getattr,
2117                 .op_flags = ALLOWED_ON_ABSENT_FS,
2118                 .op_rsize_bop = nfsd4_getattr_rsize,
2119                 .op_name = "OP_GETATTR",
2120         },
2121         [OP_GETFH] = {
2122                 .op_func = nfsd4_getfh,
2123                 .op_name = "OP_GETFH",
2124                 .op_rsize_bop = nfsd4_getfh_rsize,
2125         },
2126         [OP_LINK] = {
2127                 .op_func = nfsd4_link,
2128                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2129                                 | OP_CACHEME,
2130                 .op_name = "OP_LINK",
2131                 .op_rsize_bop = nfsd4_link_rsize,
2132         },
2133         [OP_LOCK] = {
2134                 .op_func = nfsd4_lock,
2135                 .op_flags = OP_MODIFIES_SOMETHING |
2136                                 OP_NONTRIVIAL_ERROR_ENCODE,
2137                 .op_name = "OP_LOCK",
2138                 .op_rsize_bop = nfsd4_lock_rsize,
2139                 .op_set_currentstateid = nfsd4_set_lockstateid,
2140         },
2141         [OP_LOCKT] = {
2142                 .op_func = nfsd4_lockt,
2143                 .op_flags = OP_NONTRIVIAL_ERROR_ENCODE,
2144                 .op_name = "OP_LOCKT",
2145                 .op_rsize_bop = nfsd4_lock_rsize,
2146         },
2147         [OP_LOCKU] = {
2148                 .op_func = nfsd4_locku,
2149                 .op_flags = OP_MODIFIES_SOMETHING,
2150                 .op_name = "OP_LOCKU",
2151                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2152                 .op_get_currentstateid = nfsd4_get_lockustateid,
2153         },
2154         [OP_LOOKUP] = {
2155                 .op_func = nfsd4_lookup,
2156                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2157                 .op_name = "OP_LOOKUP",
2158                 .op_rsize_bop = nfsd4_only_status_rsize,
2159         },
2160         [OP_LOOKUPP] = {
2161                 .op_func = nfsd4_lookupp,
2162                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2163                 .op_name = "OP_LOOKUPP",
2164                 .op_rsize_bop = nfsd4_only_status_rsize,
2165         },
2166         [OP_NVERIFY] = {
2167                 .op_func = nfsd4_nverify,
2168                 .op_name = "OP_NVERIFY",
2169                 .op_rsize_bop = nfsd4_only_status_rsize,
2170         },
2171         [OP_OPEN] = {
2172                 .op_func = nfsd4_open,
2173                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2174                 .op_name = "OP_OPEN",
2175                 .op_rsize_bop = nfsd4_open_rsize,
2176                 .op_set_currentstateid = nfsd4_set_openstateid,
2177         },
2178         [OP_OPEN_CONFIRM] = {
2179                 .op_func = nfsd4_open_confirm,
2180                 .op_flags = OP_MODIFIES_SOMETHING,
2181                 .op_name = "OP_OPEN_CONFIRM",
2182                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2183         },
2184         [OP_OPEN_DOWNGRADE] = {
2185                 .op_func = nfsd4_open_downgrade,
2186                 .op_flags = OP_MODIFIES_SOMETHING,
2187                 .op_name = "OP_OPEN_DOWNGRADE",
2188                 .op_rsize_bop = nfsd4_status_stateid_rsize,
2189                 .op_get_currentstateid = nfsd4_get_opendowngradestateid,
2190                 .op_set_currentstateid = nfsd4_set_opendowngradestateid,
2191         },
2192         [OP_PUTFH] = {
2193                 .op_func = nfsd4_putfh,
2194                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2195                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2196                 .op_name = "OP_PUTFH",
2197                 .op_rsize_bop = nfsd4_only_status_rsize,
2198         },
2199         [OP_PUTPUBFH] = {
2200                 .op_func = nfsd4_putrootfh,
2201                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2202                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2203                 .op_name = "OP_PUTPUBFH",
2204                 .op_rsize_bop = nfsd4_only_status_rsize,
2205         },
2206         [OP_PUTROOTFH] = {
2207                 .op_func = nfsd4_putrootfh,
2208                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2209                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2210                 .op_name = "OP_PUTROOTFH",
2211                 .op_rsize_bop = nfsd4_only_status_rsize,
2212         },
2213         [OP_READ] = {
2214                 .op_func = nfsd4_read,
2215                 .op_release = nfsd4_read_release,
2216                 .op_name = "OP_READ",
2217                 .op_rsize_bop = nfsd4_read_rsize,
2218                 .op_get_currentstateid = nfsd4_get_readstateid,
2219         },
2220         [OP_READDIR] = {
2221                 .op_func = nfsd4_readdir,
2222                 .op_name = "OP_READDIR",
2223                 .op_rsize_bop = nfsd4_readdir_rsize,
2224         },
2225         [OP_READLINK] = {
2226                 .op_func = nfsd4_readlink,
2227                 .op_name = "OP_READLINK",
2228                 .op_rsize_bop = nfsd4_readlink_rsize,
2229         },
2230         [OP_REMOVE] = {
2231                 .op_func = nfsd4_remove,
2232                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2233                 .op_name = "OP_REMOVE",
2234                 .op_rsize_bop = nfsd4_remove_rsize,
2235         },
2236         [OP_RENAME] = {
2237                 .op_func = nfsd4_rename,
2238                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2239                 .op_name = "OP_RENAME",
2240                 .op_rsize_bop = nfsd4_rename_rsize,
2241         },
2242         [OP_RENEW] = {
2243                 .op_func = nfsd4_renew,
2244                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2245                                 | OP_MODIFIES_SOMETHING,
2246                 .op_name = "OP_RENEW",
2247                 .op_rsize_bop = nfsd4_only_status_rsize,
2248
2249         },
2250         [OP_RESTOREFH] = {
2251                 .op_func = nfsd4_restorefh,
2252                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2253                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2254                 .op_name = "OP_RESTOREFH",
2255                 .op_rsize_bop = nfsd4_only_status_rsize,
2256         },
2257         [OP_SAVEFH] = {
2258                 .op_func = nfsd4_savefh,
2259                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2260                 .op_name = "OP_SAVEFH",
2261                 .op_rsize_bop = nfsd4_only_status_rsize,
2262         },
2263         [OP_SECINFO] = {
2264                 .op_func = nfsd4_secinfo,
2265                 .op_release = nfsd4_secinfo_release,
2266                 .op_flags = OP_HANDLES_WRONGSEC,
2267                 .op_name = "OP_SECINFO",
2268                 .op_rsize_bop = nfsd4_secinfo_rsize,
2269         },
2270         [OP_SETATTR] = {
2271                 .op_func = nfsd4_setattr,
2272                 .op_name = "OP_SETATTR",
2273                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME
2274                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2275                 .op_rsize_bop = nfsd4_setattr_rsize,
2276                 .op_get_currentstateid = nfsd4_get_setattrstateid,
2277         },
2278         [OP_SETCLIENTID] = {
2279                 .op_func = nfsd4_setclientid,
2280                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2281                                 | OP_MODIFIES_SOMETHING | OP_CACHEME
2282                                 | OP_NONTRIVIAL_ERROR_ENCODE,
2283                 .op_name = "OP_SETCLIENTID",
2284                 .op_rsize_bop = nfsd4_setclientid_rsize,
2285         },
2286         [OP_SETCLIENTID_CONFIRM] = {
2287                 .op_func = nfsd4_setclientid_confirm,
2288                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2289                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2290                 .op_name = "OP_SETCLIENTID_CONFIRM",
2291                 .op_rsize_bop = nfsd4_only_status_rsize,
2292         },
2293         [OP_VERIFY] = {
2294                 .op_func = nfsd4_verify,
2295                 .op_name = "OP_VERIFY",
2296                 .op_rsize_bop = nfsd4_only_status_rsize,
2297         },
2298         [OP_WRITE] = {
2299                 .op_func = nfsd4_write,
2300                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2301                 .op_name = "OP_WRITE",
2302                 .op_rsize_bop = nfsd4_write_rsize,
2303                 .op_get_currentstateid = nfsd4_get_writestateid,
2304         },
2305         [OP_RELEASE_LOCKOWNER] = {
2306                 .op_func = nfsd4_release_lockowner,
2307                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2308                                 | OP_MODIFIES_SOMETHING,
2309                 .op_name = "OP_RELEASE_LOCKOWNER",
2310                 .op_rsize_bop = nfsd4_only_status_rsize,
2311         },
2312
2313         /* NFSv4.1 operations */
2314         [OP_EXCHANGE_ID] = {
2315                 .op_func = nfsd4_exchange_id,
2316                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2317                                 | OP_MODIFIES_SOMETHING,
2318                 .op_name = "OP_EXCHANGE_ID",
2319                 .op_rsize_bop = nfsd4_exchange_id_rsize,
2320         },
2321         [OP_BACKCHANNEL_CTL] = {
2322                 .op_func = nfsd4_backchannel_ctl,
2323                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2324                 .op_name = "OP_BACKCHANNEL_CTL",
2325                 .op_rsize_bop = nfsd4_only_status_rsize,
2326         },
2327         [OP_BIND_CONN_TO_SESSION] = {
2328                 .op_func = nfsd4_bind_conn_to_session,
2329                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2330                                 | OP_MODIFIES_SOMETHING,
2331                 .op_name = "OP_BIND_CONN_TO_SESSION",
2332                 .op_rsize_bop = nfsd4_bind_conn_to_session_rsize,
2333         },
2334         [OP_CREATE_SESSION] = {
2335                 .op_func = nfsd4_create_session,
2336                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2337                                 | OP_MODIFIES_SOMETHING,
2338                 .op_name = "OP_CREATE_SESSION",
2339                 .op_rsize_bop = nfsd4_create_session_rsize,
2340         },
2341         [OP_DESTROY_SESSION] = {
2342                 .op_func = nfsd4_destroy_session,
2343                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2344                                 | OP_MODIFIES_SOMETHING,
2345                 .op_name = "OP_DESTROY_SESSION",
2346                 .op_rsize_bop = nfsd4_only_status_rsize,
2347         },
2348         [OP_SEQUENCE] = {
2349                 .op_func = nfsd4_sequence,
2350                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2351                 .op_name = "OP_SEQUENCE",
2352                 .op_rsize_bop = nfsd4_sequence_rsize,
2353         },
2354         [OP_DESTROY_CLIENTID] = {
2355                 .op_func = nfsd4_destroy_clientid,
2356                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2357                                 | OP_MODIFIES_SOMETHING,
2358                 .op_name = "OP_DESTROY_CLIENTID",
2359                 .op_rsize_bop = nfsd4_only_status_rsize,
2360         },
2361         [OP_RECLAIM_COMPLETE] = {
2362                 .op_func = nfsd4_reclaim_complete,
2363                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2364                 .op_name = "OP_RECLAIM_COMPLETE",
2365                 .op_rsize_bop = nfsd4_only_status_rsize,
2366         },
2367         [OP_SECINFO_NO_NAME] = {
2368                 .op_func = nfsd4_secinfo_no_name,
2369                 .op_release = nfsd4_secinfo_release,
2370                 .op_flags = OP_HANDLES_WRONGSEC,
2371                 .op_name = "OP_SECINFO_NO_NAME",
2372                 .op_rsize_bop = nfsd4_secinfo_rsize,
2373         },
2374         [OP_TEST_STATEID] = {
2375                 .op_func = nfsd4_test_stateid,
2376                 .op_flags = ALLOWED_WITHOUT_FH,
2377                 .op_name = "OP_TEST_STATEID",
2378                 .op_rsize_bop = nfsd4_test_stateid_rsize,
2379         },
2380         [OP_FREE_STATEID] = {
2381                 .op_func = nfsd4_free_stateid,
2382                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2383                 .op_name = "OP_FREE_STATEID",
2384                 .op_get_currentstateid = nfsd4_get_freestateid,
2385                 .op_rsize_bop = nfsd4_only_status_rsize,
2386         },
2387 #ifdef CONFIG_NFSD_PNFS
2388         [OP_GETDEVICEINFO] = {
2389                 .op_func = nfsd4_getdeviceinfo,
2390                 .op_release = nfsd4_getdeviceinfo_release,
2391                 .op_flags = ALLOWED_WITHOUT_FH,
2392                 .op_name = "OP_GETDEVICEINFO",
2393                 .op_rsize_bop = nfsd4_getdeviceinfo_rsize,
2394         },
2395         [OP_LAYOUTGET] = {
2396                 .op_func = nfsd4_layoutget,
2397                 .op_release = nfsd4_layoutget_release,
2398                 .op_flags = OP_MODIFIES_SOMETHING,
2399                 .op_name = "OP_LAYOUTGET",
2400                 .op_rsize_bop = nfsd4_layoutget_rsize,
2401         },
2402         [OP_LAYOUTCOMMIT] = {
2403                 .op_func = nfsd4_layoutcommit,
2404                 .op_flags = OP_MODIFIES_SOMETHING,
2405                 .op_name = "OP_LAYOUTCOMMIT",
2406                 .op_rsize_bop = nfsd4_layoutcommit_rsize,
2407         },
2408         [OP_LAYOUTRETURN] = {
2409                 .op_func = nfsd4_layoutreturn,
2410                 .op_flags = OP_MODIFIES_SOMETHING,
2411                 .op_name = "OP_LAYOUTRETURN",
2412                 .op_rsize_bop = nfsd4_layoutreturn_rsize,
2413         },
2414 #endif /* CONFIG_NFSD_PNFS */
2415
2416         /* NFSv4.2 operations */
2417         [OP_ALLOCATE] = {
2418                 .op_func = nfsd4_allocate,
2419                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2420                 .op_name = "OP_ALLOCATE",
2421                 .op_rsize_bop = nfsd4_only_status_rsize,
2422         },
2423         [OP_DEALLOCATE] = {
2424                 .op_func = nfsd4_deallocate,
2425                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2426                 .op_name = "OP_DEALLOCATE",
2427                 .op_rsize_bop = nfsd4_only_status_rsize,
2428         },
2429         [OP_CLONE] = {
2430                 .op_func = nfsd4_clone,
2431                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2432                 .op_name = "OP_CLONE",
2433                 .op_rsize_bop = nfsd4_only_status_rsize,
2434         },
2435         [OP_COPY] = {
2436                 .op_func = nfsd4_copy,
2437                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2438                 .op_name = "OP_COPY",
2439                 .op_rsize_bop = nfsd4_copy_rsize,
2440         },
2441         [OP_SEEK] = {
2442                 .op_func = nfsd4_seek,
2443                 .op_name = "OP_SEEK",
2444                 .op_rsize_bop = nfsd4_seek_rsize,
2445         },
2446 };
2447
2448 /**
2449  * nfsd4_spo_must_allow - Determine if the compound op contains an
2450  * operation that is allowed to be sent with machine credentials
2451  *
2452  * @rqstp: a pointer to the struct svc_rqst
2453  *
2454  * Checks to see if the compound contains a spo_must_allow op
2455  * and confirms that it was sent with the proper machine creds.
2456  */
2457
2458 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2459 {
2460         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2461         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2462         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2463         struct nfsd4_compound_state *cstate = &resp->cstate;
2464         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2465         u32 opiter;
2466
2467         if (!cstate->minorversion)
2468                 return false;
2469
2470         if (cstate->spo_must_allowed == true)
2471                 return true;
2472
2473         opiter = resp->opcnt;
2474         while (opiter < argp->opcnt) {
2475                 this = &argp->ops[opiter++];
2476                 if (test_bit(this->opnum, allow->u.longs) &&
2477                         cstate->clp->cl_mach_cred &&
2478                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2479                         cstate->spo_must_allowed = true;
2480                         return true;
2481                 }
2482         }
2483         cstate->spo_must_allowed = false;
2484         return false;
2485 }
2486
2487 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2488 {
2489         if (op->opnum == OP_ILLEGAL || op->status == nfserr_notsupp)
2490                 return op_encode_hdr_size * sizeof(__be32);
2491
2492         BUG_ON(OPDESC(op)->op_rsize_bop == NULL);
2493         return OPDESC(op)->op_rsize_bop(rqstp, op);
2494 }
2495
2496 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2497 {
2498         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2499                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2500                         op->opnum, nfsd4_op_name(op->opnum));
2501                 WARN_ON_ONCE(1);
2502         }
2503 }
2504
2505 static const char *nfsd4_op_name(unsigned opnum)
2506 {
2507         if (opnum < ARRAY_SIZE(nfsd4_ops))
2508                 return nfsd4_ops[opnum].op_name;
2509         return "unknown_operation";
2510 }
2511
2512 #define nfsd4_voidres                   nfsd4_voidargs
2513 struct nfsd4_voidargs { int dummy; };
2514
2515 static const struct svc_procedure nfsd_procedures4[2] = {
2516         [NFSPROC4_NULL] = {
2517                 .pc_func = nfsd4_proc_null,
2518                 .pc_encode = nfs4svc_encode_voidres,
2519                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2520                 .pc_ressize = sizeof(struct nfsd4_voidres),
2521                 .pc_cachetype = RC_NOCACHE,
2522                 .pc_xdrressize = 1,
2523         },
2524         [NFSPROC4_COMPOUND] = {
2525                 .pc_func = nfsd4_proc_compound,
2526                 .pc_decode = nfs4svc_decode_compoundargs,
2527                 .pc_encode = nfs4svc_encode_compoundres,
2528                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2529                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2530                 .pc_release = nfsd4_release_compoundargs,
2531                 .pc_cachetype = RC_NOCACHE,
2532                 .pc_xdrressize = NFSD_BUFSIZE/4,
2533         },
2534 };
2535
2536 static unsigned int nfsd_count3[ARRAY_SIZE(nfsd_procedures4)];
2537 const struct svc_version nfsd_version4 = {
2538         .vs_vers                = 4,
2539         .vs_nproc               = 2,
2540         .vs_proc                = nfsd_procedures4,
2541         .vs_count               = nfsd_count3,
2542         .vs_dispatch            = nfsd_dispatch,
2543         .vs_xdrsize             = NFS4_SVC_XDRSIZE,
2544         .vs_rpcb_optnl          = true,
2545         .vs_need_cong_ctrl      = true,
2546 };
2547
2548 /*
2549  * Local variables:
2550  *  c-basic-offset: 8
2551  * End:
2552  */