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Linux/fs/nfsd/nfs4proc.c

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  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/slab.h>
 37 
 38 #include "idmap.h"
 39 #include "cache.h"
 40 #include "xdr4.h"
 41 #include "vfs.h"
 42 #include "current_stateid.h"
 43 #include "netns.h"
 44 #include "acl.h"
 45 
 46 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 47 #include <linux/security.h>
 48 
 49 static inline void
 50 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 51 {
 52         struct inode *inode = resfh->fh_dentry->d_inode;
 53         int status;
 54 
 55         mutex_lock(&inode->i_mutex);
 56         status = security_inode_setsecctx(resfh->fh_dentry,
 57                 label->data, label->len);
 58         mutex_unlock(&inode->i_mutex);
 59 
 60         if (status)
 61                 /*
 62                  * XXX: We should really fail the whole open, but we may
 63                  * already have created a new file, so it may be too
 64                  * late.  For now this seems the least of evils:
 65                  */
 66                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 67 
 68         return;
 69 }
 70 #else
 71 static inline void
 72 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 73 { }
 74 #endif
 75 
 76 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 77 
 78 static u32 nfsd_attrmask[] = {
 79         NFSD_WRITEABLE_ATTRS_WORD0,
 80         NFSD_WRITEABLE_ATTRS_WORD1,
 81         NFSD_WRITEABLE_ATTRS_WORD2
 82 };
 83 
 84 static u32 nfsd41_ex_attrmask[] = {
 85         NFSD_SUPPATTR_EXCLCREAT_WORD0,
 86         NFSD_SUPPATTR_EXCLCREAT_WORD1,
 87         NFSD_SUPPATTR_EXCLCREAT_WORD2
 88 };
 89 
 90 static __be32
 91 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 92                    u32 *bmval, u32 *writable)
 93 {
 94         struct dentry *dentry = cstate->current_fh.fh_dentry;
 95 
 96         /*
 97          * Check about attributes are supported by the NFSv4 server or not.
 98          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 99          */
100         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
101             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
102             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
103                 return nfserr_attrnotsupp;
104 
105         /*
106          * Check FATTR4_WORD0_ACL can be supported
107          * in current environment or not.
108          */
109         if (bmval[0] & FATTR4_WORD0_ACL) {
110                 if (!IS_POSIXACL(dentry->d_inode))
111                         return nfserr_attrnotsupp;
112         }
113 
114         /*
115          * According to spec, read-only attributes return ERR_INVAL.
116          */
117         if (writable) {
118                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
119                     (bmval[2] & ~writable[2]))
120                         return nfserr_inval;
121         }
122 
123         return nfs_ok;
124 }
125 
126 static __be32
127 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
128         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
129 {
130         __be32 status = nfs_ok;
131 
132         if (open->op_create == NFS4_OPEN_CREATE) {
133                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
134                     || open->op_createmode == NFS4_CREATE_GUARDED)
135                         status = check_attr_support(rqstp, cstate,
136                                         open->op_bmval, nfsd_attrmask);
137                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
138                         status = check_attr_support(rqstp, cstate,
139                                         open->op_bmval, nfsd41_ex_attrmask);
140         }
141 
142         return status;
143 }
144 
145 static int
146 is_create_with_attrs(struct nfsd4_open *open)
147 {
148         return open->op_create == NFS4_OPEN_CREATE
149                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
150                     || open->op_createmode == NFS4_CREATE_GUARDED
151                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
152 }
153 
154 /*
155  * if error occurs when setting the acl, just clear the acl bit
156  * in the returned attr bitmap.
157  */
158 static void
159 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
160                 struct nfs4_acl *acl, u32 *bmval)
161 {
162         __be32 status;
163 
164         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
165         if (status)
166                 /*
167                  * We should probably fail the whole open at this point,
168                  * but we've already created the file, so it's too late;
169                  * So this seems the least of evils:
170                  */
171                 bmval[0] &= ~FATTR4_WORD0_ACL;
172 }
173 
174 static inline void
175 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
176 {
177         fh_put(dst);
178         dget(src->fh_dentry);
179         if (src->fh_export)
180                 exp_get(src->fh_export);
181         *dst = *src;
182 }
183 
184 static __be32
185 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
186 {
187         __be32 status;
188 
189         if (open->op_truncate &&
190                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
191                 return nfserr_inval;
192 
193         accmode |= NFSD_MAY_READ_IF_EXEC;
194 
195         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
196                 accmode |= NFSD_MAY_READ;
197         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
198                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
199         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
200                 accmode |= NFSD_MAY_WRITE;
201 
202         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
203 
204         return status;
205 }
206 
207 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
208 {
209         umode_t mode = fh->fh_dentry->d_inode->i_mode;
210 
211         if (S_ISREG(mode))
212                 return nfs_ok;
213         if (S_ISDIR(mode))
214                 return nfserr_isdir;
215         /*
216          * Using err_symlink as our catch-all case may look odd; but
217          * there's no other obvious error for this case in 4.0, and we
218          * happen to know that it will cause the linux v4 client to do
219          * the right thing on attempts to open something other than a
220          * regular file.
221          */
222         return nfserr_symlink;
223 }
224 
225 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
226 {
227         if (nfsd4_has_session(cstate))
228                 return;
229         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
230                         &resfh->fh_handle);
231 }
232 
233 static __be32
234 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
235 {
236         struct svc_fh *current_fh = &cstate->current_fh;
237         int accmode;
238         __be32 status;
239 
240         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
241         if (!*resfh)
242                 return nfserr_jukebox;
243         fh_init(*resfh, NFS4_FHSIZE);
244         open->op_truncate = 0;
245 
246         if (open->op_create) {
247                 /* FIXME: check session persistence and pnfs flags.
248                  * The nfsv4.1 spec requires the following semantics:
249                  *
250                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
251                  * Reply Cache  | server |                 |
252                  * -------------+--------+-----------------+--------------------
253                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
254                  *              |        |                 | (SHOULD)
255                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
256                  *              |        |                 | (SHOULD NOT)
257                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
258                  * yes          | no     | GUARDED4        | GUARDED4
259                  * yes          | yes    | GUARDED4        | GUARDED4
260                  */
261 
262                 /*
263                  * Note: create modes (UNCHECKED,GUARDED...) are the same
264                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
265                  */
266                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
267                                         open->op_fname.len, &open->op_iattr,
268                                         *resfh, open->op_createmode,
269                                         (u32 *)open->op_verf.data,
270                                         &open->op_truncate, &open->op_created);
271 
272                 if (!status && open->op_label.len)
273                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
274 
275                 /*
276                  * Following rfc 3530 14.2.16, use the returned bitmask
277                  * to indicate which attributes we used to store the
278                  * verifier:
279                  */
280                 if (open->op_createmode == NFS4_CREATE_EXCLUSIVE && status == 0)
281                         open->op_bmval[1] = (FATTR4_WORD1_TIME_ACCESS |
282                                                         FATTR4_WORD1_TIME_MODIFY);
283         } else
284                 /*
285                  * Note this may exit with the parent still locked.
286                  * We will hold the lock until nfsd4_open's final
287                  * lookup, to prevent renames or unlinks until we've had
288                  * a chance to an acquire a delegation if appropriate.
289                  */
290                 status = nfsd_lookup(rqstp, current_fh,
291                                      open->op_fname.data, open->op_fname.len, *resfh);
292         if (status)
293                 goto out;
294         status = nfsd_check_obj_isreg(*resfh);
295         if (status)
296                 goto out;
297 
298         if (is_create_with_attrs(open) && open->op_acl != NULL)
299                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
300 
301         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
302         accmode = NFSD_MAY_NOP;
303         if (open->op_created ||
304                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
305                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
306         status = do_open_permission(rqstp, *resfh, open, accmode);
307         set_change_info(&open->op_cinfo, current_fh);
308 out:
309         return status;
310 }
311 
312 static __be32
313 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
314 {
315         struct svc_fh *current_fh = &cstate->current_fh;
316         __be32 status;
317         int accmode = 0;
318 
319         /* We don't know the target directory, and therefore can not
320         * set the change info
321         */
322 
323         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
324 
325         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
326 
327         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
328                 (open->op_iattr.ia_size == 0);
329         /*
330          * In the delegation case, the client is telling us about an
331          * open that it *already* performed locally, some time ago.  We
332          * should let it succeed now if possible.
333          *
334          * In the case of a CLAIM_FH open, on the other hand, the client
335          * may be counting on us to enforce permissions (the Linux 4.1
336          * client uses this for normal opens, for example).
337          */
338         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
339                 accmode = NFSD_MAY_OWNER_OVERRIDE;
340 
341         status = do_open_permission(rqstp, current_fh, open, accmode);
342 
343         return status;
344 }
345 
346 static void
347 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
348 {
349         struct nfsd4_sessionid *sid =
350                         (struct nfsd4_sessionid *)session->se_sessionid.data;
351 
352         clid->cl_boot = sid->clientid.cl_boot;
353         clid->cl_id = sid->clientid.cl_id;
354 }
355 
356 static __be32
357 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
358            struct nfsd4_open *open)
359 {
360         __be32 status;
361         struct svc_fh *resfh = NULL;
362         struct nfsd4_compoundres *resp;
363         struct net *net = SVC_NET(rqstp);
364         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
365 
366         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
367                 (int)open->op_fname.len, open->op_fname.data,
368                 open->op_openowner);
369 
370         /* This check required by spec. */
371         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
372                 return nfserr_inval;
373 
374         open->op_created = 0;
375         /*
376          * RFC5661 18.51.3
377          * Before RECLAIM_COMPLETE done, server should deny new lock
378          */
379         if (nfsd4_has_session(cstate) &&
380             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
381                       &cstate->session->se_client->cl_flags) &&
382             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
383                 return nfserr_grace;
384 
385         if (nfsd4_has_session(cstate))
386                 copy_clientid(&open->op_clientid, cstate->session);
387 
388         /* check seqid for replay. set nfs4_owner */
389         resp = rqstp->rq_resp;
390         status = nfsd4_process_open1(&resp->cstate, open, nn);
391         if (status == nfserr_replay_me) {
392                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
393                 fh_put(&cstate->current_fh);
394                 fh_copy_shallow(&cstate->current_fh.fh_handle,
395                                 &rp->rp_openfh);
396                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
397                 if (status)
398                         dprintk("nfsd4_open: replay failed"
399                                 " restoring previous filehandle\n");
400                 else
401                         status = nfserr_replay_me;
402         }
403         if (status)
404                 goto out;
405         if (open->op_xdr_error) {
406                 status = open->op_xdr_error;
407                 goto out;
408         }
409 
410         status = nfsd4_check_open_attributes(rqstp, cstate, open);
411         if (status)
412                 goto out;
413 
414         /* Openowner is now set, so sequence id will get bumped.  Now we need
415          * these checks before we do any creates: */
416         status = nfserr_grace;
417         if (locks_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
418                 goto out;
419         status = nfserr_no_grace;
420         if (!locks_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
421                 goto out;
422 
423         switch (open->op_claim_type) {
424                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
425                 case NFS4_OPEN_CLAIM_NULL:
426                         status = do_open_lookup(rqstp, cstate, open, &resfh);
427                         if (status)
428                                 goto out;
429                         break;
430                 case NFS4_OPEN_CLAIM_PREVIOUS:
431                         status = nfs4_check_open_reclaim(&open->op_clientid,
432                                                          cstate, nn);
433                         if (status)
434                                 goto out;
435                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
436                 case NFS4_OPEN_CLAIM_FH:
437                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
438                         status = do_open_fhandle(rqstp, cstate, open);
439                         if (status)
440                                 goto out;
441                         resfh = &cstate->current_fh;
442                         break;
443                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
444                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
445                         dprintk("NFSD: unsupported OPEN claim type %d\n",
446                                 open->op_claim_type);
447                         status = nfserr_notsupp;
448                         goto out;
449                 default:
450                         dprintk("NFSD: Invalid OPEN claim type %d\n",
451                                 open->op_claim_type);
452                         status = nfserr_inval;
453                         goto out;
454         }
455         /*
456          * nfsd4_process_open2() does the actual opening of the file.  If
457          * successful, it (1) truncates the file if open->op_truncate was
458          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
459          */
460         status = nfsd4_process_open2(rqstp, resfh, open);
461         WARN(status && open->op_created,
462              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
463              be32_to_cpu(status));
464 out:
465         if (resfh && resfh != &cstate->current_fh) {
466                 fh_dup2(&cstate->current_fh, resfh);
467                 fh_put(resfh);
468                 kfree(resfh);
469         }
470         nfsd4_cleanup_open_state(cstate, open, status);
471         nfsd4_bump_seqid(cstate, status);
472         return status;
473 }
474 
475 /*
476  * OPEN is the only seqid-mutating operation whose decoding can fail
477  * with a seqid-mutating error (specifically, decoding of user names in
478  * the attributes).  Therefore we have to do some processing to look up
479  * the stateowner so that we can bump the seqid.
480  */
481 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
482 {
483         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
484 
485         if (!seqid_mutating_err(ntohl(op->status)))
486                 return op->status;
487         if (nfsd4_has_session(cstate))
488                 return op->status;
489         open->op_xdr_error = op->status;
490         return nfsd4_open(rqstp, cstate, open);
491 }
492 
493 /*
494  * filehandle-manipulating ops.
495  */
496 static __be32
497 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
498             struct svc_fh **getfh)
499 {
500         if (!cstate->current_fh.fh_dentry)
501                 return nfserr_nofilehandle;
502 
503         *getfh = &cstate->current_fh;
504         return nfs_ok;
505 }
506 
507 static __be32
508 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
509             struct nfsd4_putfh *putfh)
510 {
511         fh_put(&cstate->current_fh);
512         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
513         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
514                putfh->pf_fhlen);
515         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
516 }
517 
518 static __be32
519 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
520                 void *arg)
521 {
522         __be32 status;
523 
524         fh_put(&cstate->current_fh);
525         status = exp_pseudoroot(rqstp, &cstate->current_fh);
526         return status;
527 }
528 
529 static __be32
530 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
531                 void *arg)
532 {
533         if (!cstate->save_fh.fh_dentry)
534                 return nfserr_restorefh;
535 
536         fh_dup2(&cstate->current_fh, &cstate->save_fh);
537         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
538                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
539                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
540         }
541         return nfs_ok;
542 }
543 
544 static __be32
545 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
546              void *arg)
547 {
548         if (!cstate->current_fh.fh_dentry)
549                 return nfserr_nofilehandle;
550 
551         fh_dup2(&cstate->save_fh, &cstate->current_fh);
552         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
553                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
554                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
555         }
556         return nfs_ok;
557 }
558 
559 /*
560  * misc nfsv4 ops
561  */
562 static __be32
563 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
564              struct nfsd4_access *access)
565 {
566         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
567                 return nfserr_inval;
568 
569         access->ac_resp_access = access->ac_req_access;
570         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
571                            &access->ac_supported);
572 }
573 
574 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
575 {
576         __be32 verf[2];
577         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
578 
579         /*
580          * This is opaque to client, so no need to byte-swap. Use
581          * __force to keep sparse happy
582          */
583         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
584         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
585         memcpy(verifier->data, verf, sizeof(verifier->data));
586 }
587 
588 static __be32
589 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
590              struct nfsd4_commit *commit)
591 {
592         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
593         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
594                              commit->co_count);
595 }
596 
597 static __be32
598 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
599              struct nfsd4_create *create)
600 {
601         struct svc_fh resfh;
602         __be32 status;
603         dev_t rdev;
604 
605         fh_init(&resfh, NFS4_FHSIZE);
606 
607         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
608                            NFSD_MAY_CREATE);
609         if (status)
610                 return status;
611 
612         status = check_attr_support(rqstp, cstate, create->cr_bmval,
613                                     nfsd_attrmask);
614         if (status)
615                 return status;
616 
617         switch (create->cr_type) {
618         case NF4LNK:
619                 status = nfsd_symlink(rqstp, &cstate->current_fh,
620                                       create->cr_name, create->cr_namelen,
621                                       create->cr_data, &resfh);
622                 break;
623 
624         case NF4BLK:
625                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
626                 if (MAJOR(rdev) != create->cr_specdata1 ||
627                     MINOR(rdev) != create->cr_specdata2)
628                         return nfserr_inval;
629                 status = nfsd_create(rqstp, &cstate->current_fh,
630                                      create->cr_name, create->cr_namelen,
631                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
632                 break;
633 
634         case NF4CHR:
635                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
636                 if (MAJOR(rdev) != create->cr_specdata1 ||
637                     MINOR(rdev) != create->cr_specdata2)
638                         return nfserr_inval;
639                 status = nfsd_create(rqstp, &cstate->current_fh,
640                                      create->cr_name, create->cr_namelen,
641                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
642                 break;
643 
644         case NF4SOCK:
645                 status = nfsd_create(rqstp, &cstate->current_fh,
646                                      create->cr_name, create->cr_namelen,
647                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
648                 break;
649 
650         case NF4FIFO:
651                 status = nfsd_create(rqstp, &cstate->current_fh,
652                                      create->cr_name, create->cr_namelen,
653                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
654                 break;
655 
656         case NF4DIR:
657                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
658                 status = nfsd_create(rqstp, &cstate->current_fh,
659                                      create->cr_name, create->cr_namelen,
660                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
661                 break;
662 
663         default:
664                 status = nfserr_badtype;
665         }
666 
667         if (status)
668                 goto out;
669 
670         if (create->cr_label.len)
671                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
672 
673         if (create->cr_acl != NULL)
674                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
675                                 create->cr_bmval);
676 
677         fh_unlock(&cstate->current_fh);
678         set_change_info(&create->cr_cinfo, &cstate->current_fh);
679         fh_dup2(&cstate->current_fh, &resfh);
680 out:
681         fh_put(&resfh);
682         return status;
683 }
684 
685 static __be32
686 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
687               struct nfsd4_getattr *getattr)
688 {
689         __be32 status;
690 
691         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
692         if (status)
693                 return status;
694 
695         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
696                 return nfserr_inval;
697 
698         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
699         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
700         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
701 
702         getattr->ga_fhp = &cstate->current_fh;
703         return nfs_ok;
704 }
705 
706 static __be32
707 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
708            struct nfsd4_link *link)
709 {
710         __be32 status = nfserr_nofilehandle;
711 
712         if (!cstate->save_fh.fh_dentry)
713                 return status;
714         status = nfsd_link(rqstp, &cstate->current_fh,
715                            link->li_name, link->li_namelen, &cstate->save_fh);
716         if (!status)
717                 set_change_info(&link->li_cinfo, &cstate->current_fh);
718         return status;
719 }
720 
721 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
722 {
723         struct svc_fh tmp_fh;
724         __be32 ret;
725 
726         fh_init(&tmp_fh, NFS4_FHSIZE);
727         ret = exp_pseudoroot(rqstp, &tmp_fh);
728         if (ret)
729                 return ret;
730         if (tmp_fh.fh_dentry == fh->fh_dentry) {
731                 fh_put(&tmp_fh);
732                 return nfserr_noent;
733         }
734         fh_put(&tmp_fh);
735         return nfsd_lookup(rqstp, fh, "..", 2, fh);
736 }
737 
738 static __be32
739 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
740               void *arg)
741 {
742         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
743 }
744 
745 static __be32
746 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
747              struct nfsd4_lookup *lookup)
748 {
749         return nfsd_lookup(rqstp, &cstate->current_fh,
750                            lookup->lo_name, lookup->lo_len,
751                            &cstate->current_fh);
752 }
753 
754 static __be32
755 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
756            struct nfsd4_read *read)
757 {
758         __be32 status;
759 
760         /* no need to check permission - this will be done in nfsd_read() */
761 
762         read->rd_filp = NULL;
763         if (read->rd_offset >= OFFSET_MAX)
764                 return nfserr_inval;
765 
766         /*
767          * If we do a zero copy read, then a client will see read data
768          * that reflects the state of the file *after* performing the
769          * following compound.
770          *
771          * To ensure proper ordering, we therefore turn off zero copy if
772          * the client wants us to do more in this compound:
773          */
774         if (!nfsd4_last_compound_op(rqstp))
775                 rqstp->rq_splice_ok = false;
776 
777         /* check stateid */
778         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
779                                                  cstate, &read->rd_stateid,
780                                                  RD_STATE, &read->rd_filp))) {
781                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
782                 goto out;
783         }
784         status = nfs_ok;
785 out:
786         read->rd_rqstp = rqstp;
787         read->rd_fhp = &cstate->current_fh;
788         return status;
789 }
790 
791 static __be32
792 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
793               struct nfsd4_readdir *readdir)
794 {
795         u64 cookie = readdir->rd_cookie;
796         static const nfs4_verifier zeroverf;
797 
798         /* no need to check permission - this will be done in nfsd_readdir() */
799 
800         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
801                 return nfserr_inval;
802 
803         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
804         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
805         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
806 
807         if ((cookie == 1) || (cookie == 2) ||
808             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
809                 return nfserr_bad_cookie;
810 
811         readdir->rd_rqstp = rqstp;
812         readdir->rd_fhp = &cstate->current_fh;
813         return nfs_ok;
814 }
815 
816 static __be32
817 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
818                struct nfsd4_readlink *readlink)
819 {
820         readlink->rl_rqstp = rqstp;
821         readlink->rl_fhp = &cstate->current_fh;
822         return nfs_ok;
823 }
824 
825 static __be32
826 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
827              struct nfsd4_remove *remove)
828 {
829         __be32 status;
830 
831         if (locks_in_grace(SVC_NET(rqstp)))
832                 return nfserr_grace;
833         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
834                              remove->rm_name, remove->rm_namelen);
835         if (!status) {
836                 fh_unlock(&cstate->current_fh);
837                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
838         }
839         return status;
840 }
841 
842 static __be32
843 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
844              struct nfsd4_rename *rename)
845 {
846         __be32 status = nfserr_nofilehandle;
847 
848         if (!cstate->save_fh.fh_dentry)
849                 return status;
850         if (locks_in_grace(SVC_NET(rqstp)) &&
851                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
852                 return nfserr_grace;
853         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
854                              rename->rn_snamelen, &cstate->current_fh,
855                              rename->rn_tname, rename->rn_tnamelen);
856         if (status)
857                 return status;
858         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
859         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
860         return nfs_ok;
861 }
862 
863 static __be32
864 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
865               struct nfsd4_secinfo *secinfo)
866 {
867         struct svc_fh resfh;
868         struct svc_export *exp;
869         struct dentry *dentry;
870         __be32 err;
871 
872         fh_init(&resfh, NFS4_FHSIZE);
873         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
874         if (err)
875                 return err;
876         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
877                                     secinfo->si_name, secinfo->si_namelen,
878                                     &exp, &dentry);
879         if (err)
880                 return err;
881         fh_unlock(&cstate->current_fh);
882         if (dentry->d_inode == NULL) {
883                 exp_put(exp);
884                 err = nfserr_noent;
885         } else
886                 secinfo->si_exp = exp;
887         dput(dentry);
888         if (cstate->minorversion)
889                 /* See rfc 5661 section 2.6.3.1.1.8 */
890                 fh_put(&cstate->current_fh);
891         return err;
892 }
893 
894 static __be32
895 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
896               struct nfsd4_secinfo_no_name *sin)
897 {
898         __be32 err;
899 
900         switch (sin->sin_style) {
901         case NFS4_SECINFO_STYLE4_CURRENT_FH:
902                 break;
903         case NFS4_SECINFO_STYLE4_PARENT:
904                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
905                 if (err)
906                         return err;
907                 break;
908         default:
909                 return nfserr_inval;
910         }
911 
912         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
913         fh_put(&cstate->current_fh);
914         return nfs_ok;
915 }
916 
917 static __be32
918 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
919               struct nfsd4_setattr *setattr)
920 {
921         __be32 status = nfs_ok;
922         int err;
923 
924         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
925                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
926                         &setattr->sa_stateid, WR_STATE, NULL);
927                 if (status) {
928                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
929                         return status;
930                 }
931         }
932         err = fh_want_write(&cstate->current_fh);
933         if (err)
934                 return nfserrno(err);
935         status = nfs_ok;
936 
937         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
938                                     nfsd_attrmask);
939         if (status)
940                 goto out;
941 
942         if (setattr->sa_acl != NULL)
943                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
944                                             setattr->sa_acl);
945         if (status)
946                 goto out;
947         if (setattr->sa_label.len)
948                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
949                                 &setattr->sa_label);
950         if (status)
951                 goto out;
952         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
953                                 0, (time_t)0);
954 out:
955         fh_drop_write(&cstate->current_fh);
956         return status;
957 }
958 
959 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
960 {
961         int i = 1;
962         int buflen = write->wr_buflen;
963 
964         vec[0].iov_base = write->wr_head.iov_base;
965         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
966         buflen -= vec[0].iov_len;
967 
968         while (buflen) {
969                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
970                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
971                 buflen -= vec[i].iov_len;
972                 i++;
973         }
974         return i;
975 }
976 
977 static __be32
978 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
979             struct nfsd4_write *write)
980 {
981         stateid_t *stateid = &write->wr_stateid;
982         struct file *filp = NULL;
983         __be32 status = nfs_ok;
984         unsigned long cnt;
985         int nvecs;
986 
987         /* no need to check permission - this will be done in nfsd_write() */
988 
989         if (write->wr_offset >= OFFSET_MAX)
990                 return nfserr_inval;
991 
992         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
993                                         cstate, stateid, WR_STATE, &filp);
994         if (status) {
995                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
996                 return status;
997         }
998 
999         cnt = write->wr_buflen;
1000         write->wr_how_written = write->wr_stable_how;
1001         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
1002 
1003         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
1004         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
1005 
1006         status =  nfsd_write(rqstp, &cstate->current_fh, filp,
1007                              write->wr_offset, rqstp->rq_vec, nvecs,
1008                              &cnt, &write->wr_how_written);
1009         if (filp)
1010                 fput(filp);
1011 
1012         write->wr_bytes_written = cnt;
1013 
1014         return status;
1015 }
1016 
1017 static __be32
1018 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1019                 struct nfsd4_seek *seek)
1020 {
1021         int whence;
1022         __be32 status;
1023         struct file *file;
1024 
1025         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
1026                                             &seek->seek_stateid,
1027                                             RD_STATE, &file);
1028         if (status) {
1029                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1030                 return status;
1031         }
1032         if (!file)
1033                 return nfserr_bad_stateid;
1034 
1035         switch (seek->seek_whence) {
1036         case NFS4_CONTENT_DATA:
1037                 whence = SEEK_DATA;
1038                 break;
1039         case NFS4_CONTENT_HOLE:
1040                 whence = SEEK_HOLE;
1041                 break;
1042         default:
1043                 status = nfserr_union_notsupp;
1044                 goto out;
1045         }
1046 
1047         /*
1048          * Note:  This call does change file->f_pos, but nothing in NFSD
1049          *        should ever file->f_pos.
1050          */
1051         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1052         if (seek->seek_pos < 0)
1053                 status = nfserrno(seek->seek_pos);
1054         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1055                 seek->seek_eof = true;
1056 
1057 out:
1058         fput(file);
1059         return status;
1060 }
1061 
1062 /* This routine never returns NFS_OK!  If there are no other errors, it
1063  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1064  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1065  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1066  */
1067 static __be32
1068 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1069              struct nfsd4_verify *verify)
1070 {
1071         __be32 *buf, *p;
1072         int count;
1073         __be32 status;
1074 
1075         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1076         if (status)
1077                 return status;
1078 
1079         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1080         if (status)
1081                 return status;
1082 
1083         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1084             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1085                 return nfserr_inval;
1086         if (verify->ve_attrlen & 3)
1087                 return nfserr_inval;
1088 
1089         /* count in words:
1090          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1091          */
1092         count = 4 + (verify->ve_attrlen >> 2);
1093         buf = kmalloc(count << 2, GFP_KERNEL);
1094         if (!buf)
1095                 return nfserr_jukebox;
1096 
1097         p = buf;
1098         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1099                                     cstate->current_fh.fh_export,
1100                                     cstate->current_fh.fh_dentry,
1101                                     verify->ve_bmval,
1102                                     rqstp, 0);
1103         /*
1104          * If nfsd4_encode_fattr() ran out of space, assume that's because
1105          * the attributes are longer (hence different) than those given:
1106          */
1107         if (status == nfserr_resource)
1108                 status = nfserr_not_same;
1109         if (status)
1110                 goto out_kfree;
1111 
1112         /* skip bitmap */
1113         p = buf + 1 + ntohl(buf[0]);
1114         status = nfserr_not_same;
1115         if (ntohl(*p++) != verify->ve_attrlen)
1116                 goto out_kfree;
1117         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1118                 status = nfserr_same;
1119 
1120 out_kfree:
1121         kfree(buf);
1122         return status;
1123 }
1124 
1125 static __be32
1126 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1127               struct nfsd4_verify *verify)
1128 {
1129         __be32 status;
1130 
1131         status = _nfsd4_verify(rqstp, cstate, verify);
1132         return status == nfserr_not_same ? nfs_ok : status;
1133 }
1134 
1135 static __be32
1136 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1137              struct nfsd4_verify *verify)
1138 {
1139         __be32 status;
1140 
1141         status = _nfsd4_verify(rqstp, cstate, verify);
1142         return status == nfserr_same ? nfs_ok : status;
1143 }
1144 
1145 /*
1146  * NULL call.
1147  */
1148 static __be32
1149 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1150 {
1151         return nfs_ok;
1152 }
1153 
1154 static inline void nfsd4_increment_op_stats(u32 opnum)
1155 {
1156         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1157                 nfsdstats.nfs4_opcount[opnum]++;
1158 }
1159 
1160 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1161                               void *);
1162 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1163 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1164 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1165 
1166 enum nfsd4_op_flags {
1167         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1168         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1169         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1170         /* For rfc 5661 section 2.6.3.1.1: */
1171         OP_HANDLES_WRONGSEC = 1 << 3,
1172         OP_IS_PUTFH_LIKE = 1 << 4,
1173         /*
1174          * These are the ops whose result size we estimate before
1175          * encoding, to avoid performing an op then not being able to
1176          * respond or cache a response.  This includes writes and setattrs
1177          * as well as the operations usually called "nonidempotent":
1178          */
1179         OP_MODIFIES_SOMETHING = 1 << 5,
1180         /*
1181          * Cache compounds containing these ops in the xid-based drc:
1182          * We use the DRC for compounds containing non-idempotent
1183          * operations, *except* those that are 4.1-specific (since
1184          * sessions provide their own EOS), and except for stateful
1185          * operations other than setclientid and setclientid_confirm
1186          * (since sequence numbers provide EOS for open, lock, etc in
1187          * the v4.0 case).
1188          */
1189         OP_CACHEME = 1 << 6,
1190         /*
1191          * These are ops which clear current state id.
1192          */
1193         OP_CLEAR_STATEID = 1 << 7,
1194 };
1195 
1196 struct nfsd4_operation {
1197         nfsd4op_func op_func;
1198         u32 op_flags;
1199         char *op_name;
1200         /* Try to get response size before operation */
1201         nfsd4op_rsize op_rsize_bop;
1202         stateid_getter op_get_currentstateid;
1203         stateid_setter op_set_currentstateid;
1204 };
1205 
1206 static struct nfsd4_operation nfsd4_ops[];
1207 
1208 static const char *nfsd4_op_name(unsigned opnum);
1209 
1210 /*
1211  * Enforce NFSv4.1 COMPOUND ordering rules:
1212  *
1213  * Also note, enforced elsewhere:
1214  *      - SEQUENCE other than as first op results in
1215  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1216  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1217  *        (Enforced in nfsd4_bind_conn_to_session().)
1218  *      - DESTROY_SESSION must be the final operation in a compound, if
1219  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1220  *        (Enforced in nfsd4_destroy_session().)
1221  */
1222 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1223 {
1224         struct nfsd4_op *op = &args->ops[0];
1225 
1226         /* These ordering requirements don't apply to NFSv4.0: */
1227         if (args->minorversion == 0)
1228                 return nfs_ok;
1229         /* This is weird, but OK, not our problem: */
1230         if (args->opcnt == 0)
1231                 return nfs_ok;
1232         if (op->status == nfserr_op_illegal)
1233                 return nfs_ok;
1234         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1235                 return nfserr_op_not_in_session;
1236         if (op->opnum == OP_SEQUENCE)
1237                 return nfs_ok;
1238         if (args->opcnt != 1)
1239                 return nfserr_not_only_op;
1240         return nfs_ok;
1241 }
1242 
1243 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1244 {
1245         return &nfsd4_ops[op->opnum];
1246 }
1247 
1248 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1249 {
1250         if (op->opnum == OP_ILLEGAL)
1251                 return false;
1252         return OPDESC(op)->op_flags & OP_CACHEME;
1253 }
1254 
1255 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1256 {
1257         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1258         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1259         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1260         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1261         struct nfsd4_operation *thisd;
1262         struct nfsd4_operation *nextd;
1263 
1264         thisd = OPDESC(this);
1265         /*
1266          * Most ops check wronsec on our own; only the putfh-like ops
1267          * have special rules.
1268          */
1269         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1270                 return false;
1271         /*
1272          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1273          * put-filehandle operation if we're not going to use the
1274          * result:
1275          */
1276         if (argp->opcnt == resp->opcnt)
1277                 return false;
1278         if (next->opnum == OP_ILLEGAL)
1279                 return false;
1280         nextd = OPDESC(next);
1281         /*
1282          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1283          * errors themselves as necessary; others should check for them
1284          * now:
1285          */
1286         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1287 }
1288 
1289 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1290                                struct nfsd4_compoundres *resp)
1291 {
1292         struct xdr_stream *xdr = &resp->xdr;
1293         struct xdr_buf *buf = &rqstp->rq_res;
1294         struct kvec *head = buf->head;
1295 
1296         xdr->buf = buf;
1297         xdr->iov = head;
1298         xdr->p   = head->iov_base + head->iov_len;
1299         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1300         /* Tail and page_len should be zero at this point: */
1301         buf->len = buf->head[0].iov_len;
1302         xdr->scratch.iov_len = 0;
1303         xdr->page_ptr = buf->pages - 1;
1304         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1305                 - rqstp->rq_auth_slack;
1306 }
1307 
1308 /*
1309  * COMPOUND call.
1310  */
1311 static __be32
1312 nfsd4_proc_compound(struct svc_rqst *rqstp,
1313                     struct nfsd4_compoundargs *args,
1314                     struct nfsd4_compoundres *resp)
1315 {
1316         struct nfsd4_op *op;
1317         struct nfsd4_operation *opdesc;
1318         struct nfsd4_compound_state *cstate = &resp->cstate;
1319         struct svc_fh *current_fh = &cstate->current_fh;
1320         struct svc_fh *save_fh = &cstate->save_fh;
1321         __be32          status;
1322 
1323         svcxdr_init_encode(rqstp, resp);
1324         resp->tagp = resp->xdr.p;
1325         /* reserve space for: taglen, tag, and opcnt */
1326         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1327         resp->taglen = args->taglen;
1328         resp->tag = args->tag;
1329         resp->rqstp = rqstp;
1330         cstate->minorversion = args->minorversion;
1331         fh_init(current_fh, NFS4_FHSIZE);
1332         fh_init(save_fh, NFS4_FHSIZE);
1333         /*
1334          * Don't use the deferral mechanism for NFSv4; compounds make it
1335          * too hard to avoid non-idempotency problems.
1336          */
1337         rqstp->rq_usedeferral = false;
1338 
1339         /*
1340          * According to RFC3010, this takes precedence over all other errors.
1341          */
1342         status = nfserr_minor_vers_mismatch;
1343         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1344                 goto out;
1345 
1346         status = nfs41_check_op_ordering(args);
1347         if (status) {
1348                 op = &args->ops[0];
1349                 op->status = status;
1350                 resp->opcnt = 1;
1351                 goto encode_op;
1352         }
1353 
1354         while (!status && resp->opcnt < args->opcnt) {
1355                 op = &args->ops[resp->opcnt++];
1356 
1357                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1358                         resp->opcnt, args->opcnt, op->opnum,
1359                         nfsd4_op_name(op->opnum));
1360                 /*
1361                  * The XDR decode routines may have pre-set op->status;
1362                  * for example, if there is a miscellaneous XDR error
1363                  * it will be set to nfserr_bad_xdr.
1364                  */
1365                 if (op->status) {
1366                         if (op->opnum == OP_OPEN)
1367                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1368                         goto encode_op;
1369                 }
1370 
1371                 opdesc = OPDESC(op);
1372 
1373                 if (!current_fh->fh_dentry) {
1374                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1375                                 op->status = nfserr_nofilehandle;
1376                                 goto encode_op;
1377                         }
1378                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1379                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1380                         op->status = nfserr_moved;
1381                         goto encode_op;
1382                 }
1383 
1384                 fh_clear_wcc(current_fh);
1385 
1386                 /* If op is non-idempotent */
1387                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1388                         /*
1389                          * Don't execute this op if we couldn't encode a
1390                          * succesful reply:
1391                          */
1392                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1393                         /*
1394                          * Plus if there's another operation, make sure
1395                          * we'll have space to at least encode an error:
1396                          */
1397                         if (resp->opcnt < args->opcnt)
1398                                 plen += COMPOUND_ERR_SLACK_SPACE;
1399                         op->status = nfsd4_check_resp_size(resp, plen);
1400                 }
1401 
1402                 if (op->status)
1403                         goto encode_op;
1404 
1405                 if (opdesc->op_get_currentstateid)
1406                         opdesc->op_get_currentstateid(cstate, &op->u);
1407                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1408 
1409                 /* Only from SEQUENCE */
1410                 if (cstate->status == nfserr_replay_cache) {
1411                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1412                         status = op->status;
1413                         goto out;
1414                 }
1415                 if (!op->status) {
1416                         if (opdesc->op_set_currentstateid)
1417                                 opdesc->op_set_currentstateid(cstate, &op->u);
1418 
1419                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1420                                 clear_current_stateid(cstate);
1421 
1422                         if (need_wrongsec_check(rqstp))
1423                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1424                 }
1425 encode_op:
1426                 if (op->status == nfserr_replay_me) {
1427                         op->replay = &cstate->replay_owner->so_replay;
1428                         nfsd4_encode_replay(&resp->xdr, op);
1429                         status = op->status = op->replay->rp_status;
1430                 } else {
1431                         nfsd4_encode_operation(resp, op);
1432                         status = op->status;
1433                 }
1434 
1435                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1436                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1437                         be32_to_cpu(status));
1438 
1439                 nfsd4_cstate_clear_replay(cstate);
1440                 /* XXX Ugh, we need to get rid of this kind of special case: */
1441                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1442                         fput(op->u.read.rd_filp);
1443 
1444                 nfsd4_increment_op_stats(op->opnum);
1445         }
1446 
1447         cstate->status = status;
1448         fh_put(current_fh);
1449         fh_put(save_fh);
1450         BUG_ON(cstate->replay_owner);
1451 out:
1452         /* Reset deferral mechanism for RPC deferrals */
1453         rqstp->rq_usedeferral = true;
1454         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1455         return status;
1456 }
1457 
1458 #define op_encode_hdr_size              (2)
1459 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1460 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1461 #define op_encode_change_info_maxsz     (5)
1462 #define nfs4_fattr_bitmap_maxsz         (4)
1463 
1464 /* We'll fall back on returning no lockowner if run out of space: */
1465 #define op_encode_lockowner_maxsz       (0)
1466 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1467 
1468 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1469 
1470 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1471 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1472                                          op_encode_ace_maxsz)
1473 
1474 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1475 
1476 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1477 {
1478         return (op_encode_hdr_size) * sizeof(__be32);
1479 }
1480 
1481 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1482 {
1483         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1484 }
1485 
1486 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1487 {
1488         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1489 }
1490 
1491 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1492 {
1493         return (op_encode_hdr_size + op_encode_change_info_maxsz
1494                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1495 }
1496 
1497 /*
1498  * Note since this is an idempotent operation we won't insist on failing
1499  * the op prematurely if the estimate is too large.  We may turn off splice
1500  * reads unnecessarily.
1501  */
1502 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1503                                       struct nfsd4_op *op)
1504 {
1505         u32 *bmap = op->u.getattr.ga_bmval;
1506         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1507         u32 ret = 0;
1508 
1509         if (bmap0 & FATTR4_WORD0_ACL)
1510                 return svc_max_payload(rqstp);
1511         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1512                 return svc_max_payload(rqstp);
1513 
1514         if (bmap1 & FATTR4_WORD1_OWNER) {
1515                 ret += IDMAP_NAMESZ + 4;
1516                 bmap1 &= ~FATTR4_WORD1_OWNER;
1517         }
1518         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1519                 ret += IDMAP_NAMESZ + 4;
1520                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1521         }
1522         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1523                 ret += NFS4_FHSIZE + 4;
1524                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1525         }
1526         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1527                 ret += NFSD4_MAX_SEC_LABEL_LEN + 12;
1528                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1529         }
1530         /*
1531          * Largest of remaining attributes are 16 bytes (e.g.,
1532          * supported_attributes)
1533          */
1534         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1535         /* bitmask, length */
1536         ret += 20;
1537         return ret;
1538 }
1539 
1540 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1541 {
1542         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1543                 * sizeof(__be32);
1544 }
1545 
1546 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1547 {
1548         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1549                 * sizeof(__be32);
1550 }
1551 
1552 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1553 {
1554         return (op_encode_hdr_size + op_encode_stateid_maxsz
1555                 + op_encode_change_info_maxsz + 1
1556                 + nfs4_fattr_bitmap_maxsz
1557                 + op_encode_delegation_maxsz) * sizeof(__be32);
1558 }
1559 
1560 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1561 {
1562         u32 maxcount = 0, rlen = 0;
1563 
1564         maxcount = svc_max_payload(rqstp);
1565         rlen = min(op->u.read.rd_length, maxcount);
1566 
1567         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1568 }
1569 
1570 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1571 {
1572         u32 maxcount = 0, rlen = 0;
1573 
1574         maxcount = svc_max_payload(rqstp);
1575         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1576 
1577         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1578                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1579 }
1580 
1581 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1582 {
1583         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1584                 * sizeof(__be32);
1585 }
1586 
1587 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1588 {
1589         return (op_encode_hdr_size + op_encode_change_info_maxsz
1590                 + op_encode_change_info_maxsz) * sizeof(__be32);
1591 }
1592 
1593 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1594                                        struct nfsd4_op *op)
1595 {
1596         return (op_encode_hdr_size
1597                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1598 }
1599 
1600 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1601 {
1602         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1603 }
1604 
1605 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1606 {
1607         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1608                                                                 sizeof(__be32);
1609 }
1610 
1611 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1612 {
1613         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1614 }
1615 
1616 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1617 {
1618         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1619                 1 + 1 + /* eir_flags, spr_how */\
1620                 4 + /* spo_must_enforce & _allow with bitmap */\
1621                 2 + /*eir_server_owner.so_minor_id */\
1622                 /* eir_server_owner.so_major_id<> */\
1623                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1624                 /* eir_server_scope<> */\
1625                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1626                 1 + /* eir_server_impl_id array length */\
1627                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1628 }
1629 
1630 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1631 {
1632         return (op_encode_hdr_size + \
1633                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1634                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1635 }
1636 
1637 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1638 {
1639         return (op_encode_hdr_size + \
1640                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1641                 2 + /* csr_sequence, csr_flags */\
1642                 op_encode_channel_attrs_maxsz + \
1643                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1644 }
1645 
1646 static struct nfsd4_operation nfsd4_ops[] = {
1647         [OP_ACCESS] = {
1648                 .op_func = (nfsd4op_func)nfsd4_access,
1649                 .op_name = "OP_ACCESS",
1650         },
1651         [OP_CLOSE] = {
1652                 .op_func = (nfsd4op_func)nfsd4_close,
1653                 .op_flags = OP_MODIFIES_SOMETHING,
1654                 .op_name = "OP_CLOSE",
1655                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1656                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1657                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1658         },
1659         [OP_COMMIT] = {
1660                 .op_func = (nfsd4op_func)nfsd4_commit,
1661                 .op_flags = OP_MODIFIES_SOMETHING,
1662                 .op_name = "OP_COMMIT",
1663                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1664         },
1665         [OP_CREATE] = {
1666                 .op_func = (nfsd4op_func)nfsd4_create,
1667                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1668                 .op_name = "OP_CREATE",
1669                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1670         },
1671         [OP_DELEGRETURN] = {
1672                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1673                 .op_flags = OP_MODIFIES_SOMETHING,
1674                 .op_name = "OP_DELEGRETURN",
1675                 .op_rsize_bop = nfsd4_only_status_rsize,
1676                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1677         },
1678         [OP_GETATTR] = {
1679                 .op_func = (nfsd4op_func)nfsd4_getattr,
1680                 .op_flags = ALLOWED_ON_ABSENT_FS,
1681                 .op_rsize_bop = nfsd4_getattr_rsize,
1682                 .op_name = "OP_GETATTR",
1683         },
1684         [OP_GETFH] = {
1685                 .op_func = (nfsd4op_func)nfsd4_getfh,
1686                 .op_name = "OP_GETFH",
1687         },
1688         [OP_LINK] = {
1689                 .op_func = (nfsd4op_func)nfsd4_link,
1690                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1691                                 | OP_CACHEME,
1692                 .op_name = "OP_LINK",
1693                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1694         },
1695         [OP_LOCK] = {
1696                 .op_func = (nfsd4op_func)nfsd4_lock,
1697                 .op_flags = OP_MODIFIES_SOMETHING,
1698                 .op_name = "OP_LOCK",
1699                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1700                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1701         },
1702         [OP_LOCKT] = {
1703                 .op_func = (nfsd4op_func)nfsd4_lockt,
1704                 .op_name = "OP_LOCKT",
1705         },
1706         [OP_LOCKU] = {
1707                 .op_func = (nfsd4op_func)nfsd4_locku,
1708                 .op_flags = OP_MODIFIES_SOMETHING,
1709                 .op_name = "OP_LOCKU",
1710                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1711                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1712         },
1713         [OP_LOOKUP] = {
1714                 .op_func = (nfsd4op_func)nfsd4_lookup,
1715                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1716                 .op_name = "OP_LOOKUP",
1717         },
1718         [OP_LOOKUPP] = {
1719                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1720                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1721                 .op_name = "OP_LOOKUPP",
1722         },
1723         [OP_NVERIFY] = {
1724                 .op_func = (nfsd4op_func)nfsd4_nverify,
1725                 .op_name = "OP_NVERIFY",
1726         },
1727         [OP_OPEN] = {
1728                 .op_func = (nfsd4op_func)nfsd4_open,
1729                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1730                 .op_name = "OP_OPEN",
1731                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1732                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1733         },
1734         [OP_OPEN_CONFIRM] = {
1735                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1736                 .op_flags = OP_MODIFIES_SOMETHING,
1737                 .op_name = "OP_OPEN_CONFIRM",
1738                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1739         },
1740         [OP_OPEN_DOWNGRADE] = {
1741                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1742                 .op_flags = OP_MODIFIES_SOMETHING,
1743                 .op_name = "OP_OPEN_DOWNGRADE",
1744                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1745                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1746                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1747         },
1748         [OP_PUTFH] = {
1749                 .op_func = (nfsd4op_func)nfsd4_putfh,
1750                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1751                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1752                 .op_name = "OP_PUTFH",
1753                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1754         },
1755         [OP_PUTPUBFH] = {
1756                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1757                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1758                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1759                 .op_name = "OP_PUTPUBFH",
1760                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1761         },
1762         [OP_PUTROOTFH] = {
1763                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1764                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1765                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
1766                 .op_name = "OP_PUTROOTFH",
1767                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1768         },
1769         [OP_READ] = {
1770                 .op_func = (nfsd4op_func)nfsd4_read,
1771                 .op_name = "OP_READ",
1772                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1773                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1774         },
1775         [OP_READDIR] = {
1776                 .op_func = (nfsd4op_func)nfsd4_readdir,
1777                 .op_name = "OP_READDIR",
1778                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1779         },
1780         [OP_READLINK] = {
1781                 .op_func = (nfsd4op_func)nfsd4_readlink,
1782                 .op_name = "OP_READLINK",
1783         },
1784         [OP_REMOVE] = {
1785                 .op_func = (nfsd4op_func)nfsd4_remove,
1786                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1787                 .op_name = "OP_REMOVE",
1788                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1789         },
1790         [OP_RENAME] = {
1791                 .op_func = (nfsd4op_func)nfsd4_rename,
1792                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1793                 .op_name = "OP_RENAME",
1794                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1795         },
1796         [OP_RENEW] = {
1797                 .op_func = (nfsd4op_func)nfsd4_renew,
1798                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1799                                 | OP_MODIFIES_SOMETHING,
1800                 .op_name = "OP_RENEW",
1801                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1802 
1803         },
1804         [OP_RESTOREFH] = {
1805                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1806                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1807                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1808                 .op_name = "OP_RESTOREFH",
1809                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1810         },
1811         [OP_SAVEFH] = {
1812                 .op_func = (nfsd4op_func)nfsd4_savefh,
1813                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1814                 .op_name = "OP_SAVEFH",
1815                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1816         },
1817         [OP_SECINFO] = {
1818                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1819                 .op_flags = OP_HANDLES_WRONGSEC,
1820                 .op_name = "OP_SECINFO",
1821         },
1822         [OP_SETATTR] = {
1823                 .op_func = (nfsd4op_func)nfsd4_setattr,
1824                 .op_name = "OP_SETATTR",
1825                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1826                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1827                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1828         },
1829         [OP_SETCLIENTID] = {
1830                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1831                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1832                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1833                 .op_name = "OP_SETCLIENTID",
1834                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1835         },
1836         [OP_SETCLIENTID_CONFIRM] = {
1837                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1838                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1839                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1840                 .op_name = "OP_SETCLIENTID_CONFIRM",
1841                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1842         },
1843         [OP_VERIFY] = {
1844                 .op_func = (nfsd4op_func)nfsd4_verify,
1845                 .op_name = "OP_VERIFY",
1846         },
1847         [OP_WRITE] = {
1848                 .op_func = (nfsd4op_func)nfsd4_write,
1849                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1850                 .op_name = "OP_WRITE",
1851                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1852                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1853         },
1854         [OP_RELEASE_LOCKOWNER] = {
1855                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1856                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1857                                 | OP_MODIFIES_SOMETHING,
1858                 .op_name = "OP_RELEASE_LOCKOWNER",
1859                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1860         },
1861 
1862         /* NFSv4.1 operations */
1863         [OP_EXCHANGE_ID] = {
1864                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1865                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1866                                 | OP_MODIFIES_SOMETHING,
1867                 .op_name = "OP_EXCHANGE_ID",
1868                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1869         },
1870         [OP_BACKCHANNEL_CTL] = {
1871                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1872                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1873                 .op_name = "OP_BACKCHANNEL_CTL",
1874                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1875         },
1876         [OP_BIND_CONN_TO_SESSION] = {
1877                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1878                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1879                                 | OP_MODIFIES_SOMETHING,
1880                 .op_name = "OP_BIND_CONN_TO_SESSION",
1881                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1882         },
1883         [OP_CREATE_SESSION] = {
1884                 .op_func = (nfsd4op_func)nfsd4_create_session,
1885                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1886                                 | OP_MODIFIES_SOMETHING,
1887                 .op_name = "OP_CREATE_SESSION",
1888                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1889         },
1890         [OP_DESTROY_SESSION] = {
1891                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1892                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1893                                 | OP_MODIFIES_SOMETHING,
1894                 .op_name = "OP_DESTROY_SESSION",
1895                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1896         },
1897         [OP_SEQUENCE] = {
1898                 .op_func = (nfsd4op_func)nfsd4_sequence,
1899                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1900                 .op_name = "OP_SEQUENCE",
1901                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
1902         },
1903         [OP_DESTROY_CLIENTID] = {
1904                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1905                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1906                                 | OP_MODIFIES_SOMETHING,
1907                 .op_name = "OP_DESTROY_CLIENTID",
1908                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1909         },
1910         [OP_RECLAIM_COMPLETE] = {
1911                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1912                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1913                 .op_name = "OP_RECLAIM_COMPLETE",
1914                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1915         },
1916         [OP_SECINFO_NO_NAME] = {
1917                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1918                 .op_flags = OP_HANDLES_WRONGSEC,
1919                 .op_name = "OP_SECINFO_NO_NAME",
1920         },
1921         [OP_TEST_STATEID] = {
1922                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1923                 .op_flags = ALLOWED_WITHOUT_FH,
1924                 .op_name = "OP_TEST_STATEID",
1925         },
1926         [OP_FREE_STATEID] = {
1927                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1928                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1929                 .op_name = "OP_FREE_STATEID",
1930                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1931                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1932         },
1933 
1934         /* NFSv4.2 operations */
1935         [OP_SEEK] = {
1936                 .op_func = (nfsd4op_func)nfsd4_seek,
1937                 .op_name = "OP_SEEK",
1938         },
1939 };
1940 
1941 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
1942 {
1943         struct nfsd4_operation *opdesc;
1944         nfsd4op_rsize estimator;
1945 
1946         if (op->opnum == OP_ILLEGAL)
1947                 return op_encode_hdr_size * sizeof(__be32);
1948         opdesc = OPDESC(op);
1949         estimator = opdesc->op_rsize_bop;
1950         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
1951 }
1952 
1953 void warn_on_nonidempotent_op(struct nfsd4_op *op)
1954 {
1955         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
1956                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
1957                         op->opnum, nfsd4_op_name(op->opnum));
1958                 WARN_ON_ONCE(1);
1959         }
1960 }
1961 
1962 static const char *nfsd4_op_name(unsigned opnum)
1963 {
1964         if (opnum < ARRAY_SIZE(nfsd4_ops))
1965                 return nfsd4_ops[opnum].op_name;
1966         return "unknown_operation";
1967 }
1968 
1969 #define nfsd4_voidres                   nfsd4_voidargs
1970 struct nfsd4_voidargs { int dummy; };
1971 
1972 static struct svc_procedure             nfsd_procedures4[2] = {
1973         [NFSPROC4_NULL] = {
1974                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1975                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1976                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1977                 .pc_ressize = sizeof(struct nfsd4_voidres),
1978                 .pc_cachetype = RC_NOCACHE,
1979                 .pc_xdrressize = 1,
1980         },
1981         [NFSPROC4_COMPOUND] = {
1982                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1983                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1984                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1985                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1986                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1987                 .pc_release = nfsd4_release_compoundargs,
1988                 .pc_cachetype = RC_NOCACHE,
1989                 .pc_xdrressize = NFSD_BUFSIZE/4,
1990         },
1991 };
1992 
1993 struct svc_version      nfsd_version4 = {
1994                 .vs_vers        = 4,
1995                 .vs_nproc       = 2,
1996                 .vs_proc        = nfsd_procedures4,
1997                 .vs_dispatch    = nfsd_dispatch,
1998                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1999                 .vs_rpcb_optnl  = 1,
2000 };
2001 
2002 /*
2003  * Local variables:
2004  *  c-basic-offset: 8
2005  * End:
2006  */
2007 

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