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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 
 45 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 46 #include <linux/security.h>
 47 
 48 static inline void
 49 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 50 {
 51         struct inode *inode = resfh->fh_dentry->d_inode;
 52         int status;
 53 
 54         mutex_lock(&inode->i_mutex);
 55         status = security_inode_setsecctx(resfh->fh_dentry,
 56                 label->data, label->len);
 57         mutex_unlock(&inode->i_mutex);
 58 
 59         if (status)
 60                 /*
 61                  * XXX: We should really fail the whole open, but we may
 62                  * already have created a new file, so it may be too
 63                  * late.  For now this seems the least of evils:
 64                  */
 65                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 66 
 67         return;
 68 }
 69 #else
 70 static inline void
 71 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 72 { }
 73 #endif
 74 
 75 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 76 
 77 static u32 nfsd_attrmask[] = {
 78         NFSD_WRITEABLE_ATTRS_WORD0,
 79         NFSD_WRITEABLE_ATTRS_WORD1,
 80         NFSD_WRITEABLE_ATTRS_WORD2
 81 };
 82 
 83 static u32 nfsd41_ex_attrmask[] = {
 84         NFSD_SUPPATTR_EXCLCREAT_WORD0,
 85         NFSD_SUPPATTR_EXCLCREAT_WORD1,
 86         NFSD_SUPPATTR_EXCLCREAT_WORD2
 87 };
 88 
 89 static __be32
 90 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 91                    u32 *bmval, u32 *writable)
 92 {
 93         struct dentry *dentry = cstate->current_fh.fh_dentry;
 94 
 95         /*
 96          * Check about attributes are supported by the NFSv4 server or not.
 97          * According to spec, unsupported attributes return ERR_ATTRNOTSUPP.
 98          */
 99         if ((bmval[0] & ~nfsd_suppattrs0(cstate->minorversion)) ||
100             (bmval[1] & ~nfsd_suppattrs1(cstate->minorversion)) ||
101             (bmval[2] & ~nfsd_suppattrs2(cstate->minorversion)))
102                 return nfserr_attrnotsupp;
103 
104         /*
105          * Check FATTR4_WORD0_ACL can be supported
106          * in current environment or not.
107          */
108         if (bmval[0] & FATTR4_WORD0_ACL) {
109                 if (!IS_POSIXACL(dentry->d_inode))
110                         return nfserr_attrnotsupp;
111         }
112 
113         /*
114          * According to spec, read-only attributes return ERR_INVAL.
115          */
116         if (writable) {
117                 if ((bmval[0] & ~writable[0]) || (bmval[1] & ~writable[1]) ||
118                     (bmval[2] & ~writable[2]))
119                         return nfserr_inval;
120         }
121 
122         return nfs_ok;
123 }
124 
125 static __be32
126 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
127         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
128 {
129         __be32 status = nfs_ok;
130 
131         if (open->op_create == NFS4_OPEN_CREATE) {
132                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
133                     || open->op_createmode == NFS4_CREATE_GUARDED)
134                         status = check_attr_support(rqstp, cstate,
135                                         open->op_bmval, nfsd_attrmask);
136                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
137                         status = check_attr_support(rqstp, cstate,
138                                         open->op_bmval, nfsd41_ex_attrmask);
139         }
140 
141         return status;
142 }
143 
144 static int
145 is_create_with_attrs(struct nfsd4_open *open)
146 {
147         return open->op_create == NFS4_OPEN_CREATE
148                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
149                     || open->op_createmode == NFS4_CREATE_GUARDED
150                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
151 }
152 
153 /*
154  * if error occurs when setting the acl, just clear the acl bit
155  * in the returned attr bitmap.
156  */
157 static void
158 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
159                 struct nfs4_acl *acl, u32 *bmval)
160 {
161         __be32 status;
162 
163         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
164         if (status)
165                 /*
166                  * We should probably fail the whole open at this point,
167                  * but we've already created the file, so it's too late;
168                  * So this seems the least of evils:
169                  */
170                 bmval[0] &= ~FATTR4_WORD0_ACL;
171 }
172 
173 static inline void
174 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
175 {
176         fh_put(dst);
177         dget(src->fh_dentry);
178         if (src->fh_export)
179                 cache_get(&src->fh_export->h);
180         *dst = *src;
181 }
182 
183 static __be32
184 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
185 {
186         __be32 status;
187 
188         if (open->op_truncate &&
189                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
190                 return nfserr_inval;
191 
192         accmode |= NFSD_MAY_READ_IF_EXEC;
193 
194         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
195                 accmode |= NFSD_MAY_READ;
196         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
197                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
198         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
199                 accmode |= NFSD_MAY_WRITE;
200 
201         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
202 
203         return status;
204 }
205 
206 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
207 {
208         umode_t mode = fh->fh_dentry->d_inode->i_mode;
209 
210         if (S_ISREG(mode))
211                 return nfs_ok;
212         if (S_ISDIR(mode))
213                 return nfserr_isdir;
214         /*
215          * Using err_symlink as our catch-all case may look odd; but
216          * there's no other obvious error for this case in 4.0, and we
217          * happen to know that it will cause the linux v4 client to do
218          * the right thing on attempts to open something other than a
219          * regular file.
220          */
221         return nfserr_symlink;
222 }
223 
224 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
225 {
226         if (nfsd4_has_session(cstate))
227                 return;
228         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
229                         &resfh->fh_handle);
230 }
231 
232 static __be32
233 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
234 {
235         struct svc_fh *current_fh = &cstate->current_fh;
236         struct svc_fh *resfh;
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                 status = nfsd_lookup(rqstp, current_fh,
285                                      open->op_fname.data, open->op_fname.len, resfh);
286                 fh_unlock(current_fh);
287         }
288         if (status)
289                 goto out;
290         status = nfsd_check_obj_isreg(resfh);
291         if (status)
292                 goto out;
293 
294         if (is_create_with_attrs(open) && open->op_acl != NULL)
295                 do_set_nfs4_acl(rqstp, resfh, open->op_acl, open->op_bmval);
296 
297         nfsd4_set_open_owner_reply_cache(cstate, open, resfh);
298         accmode = NFSD_MAY_NOP;
299         if (open->op_created ||
300                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
301                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
302         status = do_open_permission(rqstp, resfh, open, accmode);
303         set_change_info(&open->op_cinfo, current_fh);
304         fh_dup2(current_fh, resfh);
305 out:
306         fh_put(resfh);
307         kfree(resfh);
308         return status;
309 }
310 
311 static __be32
312 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
313 {
314         struct svc_fh *current_fh = &cstate->current_fh;
315         __be32 status;
316         int accmode = 0;
317 
318         /* We don't know the target directory, and therefore can not
319         * set the change info
320         */
321 
322         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
323 
324         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
325 
326         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
327                 (open->op_iattr.ia_size == 0);
328         /*
329          * In the delegation case, the client is telling us about an
330          * open that it *already* performed locally, some time ago.  We
331          * should let it succeed now if possible.
332          *
333          * In the case of a CLAIM_FH open, on the other hand, the client
334          * may be counting on us to enforce permissions (the Linux 4.1
335          * client uses this for normal opens, for example).
336          */
337         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
338                 accmode = NFSD_MAY_OWNER_OVERRIDE;
339 
340         status = do_open_permission(rqstp, current_fh, open, accmode);
341 
342         return status;
343 }
344 
345 static void
346 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
347 {
348         struct nfsd4_sessionid *sid =
349                         (struct nfsd4_sessionid *)session->se_sessionid.data;
350 
351         clid->cl_boot = sid->clientid.cl_boot;
352         clid->cl_id = sid->clientid.cl_id;
353 }
354 
355 static __be32
356 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
357            struct nfsd4_open *open)
358 {
359         __be32 status;
360         struct nfsd4_compoundres *resp;
361         struct net *net = SVC_NET(rqstp);
362         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
363 
364         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
365                 (int)open->op_fname.len, open->op_fname.data,
366                 open->op_openowner);
367 
368         /* This check required by spec. */
369         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
370                 return nfserr_inval;
371 
372         open->op_created = 0;
373         /*
374          * RFC5661 18.51.3
375          * Before RECLAIM_COMPLETE done, server should deny new lock
376          */
377         if (nfsd4_has_session(cstate) &&
378             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
379                       &cstate->session->se_client->cl_flags) &&
380             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
381                 return nfserr_grace;
382 
383         if (nfsd4_has_session(cstate))
384                 copy_clientid(&open->op_clientid, cstate->session);
385 
386         nfs4_lock_state();
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);
427                         if (status)
428                                 goto out;
429                         break;
430                 case NFS4_OPEN_CLAIM_PREVIOUS:
431                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
432                         status = nfs4_check_open_reclaim(&open->op_clientid,
433                                                          cstate->minorversion,
434                                                          nn);
435                         if (status)
436                                 goto out;
437                 case NFS4_OPEN_CLAIM_FH:
438                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
439                         status = do_open_fhandle(rqstp, cstate, open);
440                         if (status)
441                                 goto out;
442                         break;
443                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
444                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
445                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
446                         dprintk("NFSD: unsupported OPEN claim type %d\n",
447                                 open->op_claim_type);
448                         status = nfserr_notsupp;
449                         goto out;
450                 default:
451                         dprintk("NFSD: Invalid OPEN claim type %d\n",
452                                 open->op_claim_type);
453                         status = nfserr_inval;
454                         goto out;
455         }
456         /*
457          * nfsd4_process_open2() does the actual opening of the file.  If
458          * successful, it (1) truncates the file if open->op_truncate was
459          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
460          */
461         status = nfsd4_process_open2(rqstp, &cstate->current_fh, open);
462         WARN_ON(status && open->op_created);
463 out:
464         nfsd4_cleanup_open_state(open, status);
465         if (open->op_openowner && !nfsd4_has_session(cstate))
466                 cstate->replay_owner = &open->op_openowner->oo_owner;
467         nfsd4_bump_seqid(cstate, status);
468         if (!cstate->replay_owner)
469                 nfs4_unlock_state();
470         return status;
471 }
472 
473 /*
474  * OPEN is the only seqid-mutating operation whose decoding can fail
475  * with a seqid-mutating error (specifically, decoding of user names in
476  * the attributes).  Therefore we have to do some processing to look up
477  * the stateowner so that we can bump the seqid.
478  */
479 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
480 {
481         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
482 
483         if (!seqid_mutating_err(ntohl(op->status)))
484                 return op->status;
485         if (nfsd4_has_session(cstate))
486                 return op->status;
487         open->op_xdr_error = op->status;
488         return nfsd4_open(rqstp, cstate, open);
489 }
490 
491 /*
492  * filehandle-manipulating ops.
493  */
494 static __be32
495 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
496             struct svc_fh **getfh)
497 {
498         if (!cstate->current_fh.fh_dentry)
499                 return nfserr_nofilehandle;
500 
501         *getfh = &cstate->current_fh;
502         return nfs_ok;
503 }
504 
505 static __be32
506 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
507             struct nfsd4_putfh *putfh)
508 {
509         fh_put(&cstate->current_fh);
510         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
511         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
512                putfh->pf_fhlen);
513         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
514 }
515 
516 static __be32
517 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
518                 void *arg)
519 {
520         __be32 status;
521 
522         fh_put(&cstate->current_fh);
523         status = exp_pseudoroot(rqstp, &cstate->current_fh);
524         return status;
525 }
526 
527 static __be32
528 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
529                 void *arg)
530 {
531         if (!cstate->save_fh.fh_dentry)
532                 return nfserr_restorefh;
533 
534         fh_dup2(&cstate->current_fh, &cstate->save_fh);
535         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
536                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
537                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
538         }
539         return nfs_ok;
540 }
541 
542 static __be32
543 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
544              void *arg)
545 {
546         if (!cstate->current_fh.fh_dentry)
547                 return nfserr_nofilehandle;
548 
549         fh_dup2(&cstate->save_fh, &cstate->current_fh);
550         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
551                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
552                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
553         }
554         return nfs_ok;
555 }
556 
557 /*
558  * misc nfsv4 ops
559  */
560 static __be32
561 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
562              struct nfsd4_access *access)
563 {
564         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
565                 return nfserr_inval;
566 
567         access->ac_resp_access = access->ac_req_access;
568         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
569                            &access->ac_supported);
570 }
571 
572 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
573 {
574         __be32 verf[2];
575         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
576 
577         verf[0] = (__be32)nn->nfssvc_boot.tv_sec;
578         verf[1] = (__be32)nn->nfssvc_boot.tv_usec;
579         memcpy(verifier->data, verf, sizeof(verifier->data));
580 }
581 
582 static __be32
583 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
584              struct nfsd4_commit *commit)
585 {
586         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
587         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
588                              commit->co_count);
589 }
590 
591 static __be32
592 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
593              struct nfsd4_create *create)
594 {
595         struct svc_fh resfh;
596         __be32 status;
597         dev_t rdev;
598 
599         fh_init(&resfh, NFS4_FHSIZE);
600 
601         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR,
602                            NFSD_MAY_CREATE);
603         if (status)
604                 return status;
605 
606         status = check_attr_support(rqstp, cstate, create->cr_bmval,
607                                     nfsd_attrmask);
608         if (status)
609                 return status;
610 
611         switch (create->cr_type) {
612         case NF4LNK:
613                 status = nfsd_symlink(rqstp, &cstate->current_fh,
614                                       create->cr_name, create->cr_namelen,
615                                       create->cr_linkname, create->cr_linklen,
616                                       &resfh, &create->cr_iattr);
617                 break;
618 
619         case NF4BLK:
620                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
621                 if (MAJOR(rdev) != create->cr_specdata1 ||
622                     MINOR(rdev) != create->cr_specdata2)
623                         return nfserr_inval;
624                 status = nfsd_create(rqstp, &cstate->current_fh,
625                                      create->cr_name, create->cr_namelen,
626                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
627                 break;
628 
629         case NF4CHR:
630                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
631                 if (MAJOR(rdev) != create->cr_specdata1 ||
632                     MINOR(rdev) != create->cr_specdata2)
633                         return nfserr_inval;
634                 status = nfsd_create(rqstp, &cstate->current_fh,
635                                      create->cr_name, create->cr_namelen,
636                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
637                 break;
638 
639         case NF4SOCK:
640                 status = nfsd_create(rqstp, &cstate->current_fh,
641                                      create->cr_name, create->cr_namelen,
642                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
643                 break;
644 
645         case NF4FIFO:
646                 status = nfsd_create(rqstp, &cstate->current_fh,
647                                      create->cr_name, create->cr_namelen,
648                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
649                 break;
650 
651         case NF4DIR:
652                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
653                 status = nfsd_create(rqstp, &cstate->current_fh,
654                                      create->cr_name, create->cr_namelen,
655                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
656                 break;
657 
658         default:
659                 status = nfserr_badtype;
660         }
661 
662         if (status)
663                 goto out;
664 
665         if (create->cr_label.len)
666                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
667 
668         if (create->cr_acl != NULL)
669                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
670                                 create->cr_bmval);
671 
672         fh_unlock(&cstate->current_fh);
673         set_change_info(&create->cr_cinfo, &cstate->current_fh);
674         fh_dup2(&cstate->current_fh, &resfh);
675 out:
676         fh_put(&resfh);
677         return status;
678 }
679 
680 static __be32
681 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
682               struct nfsd4_getattr *getattr)
683 {
684         __be32 status;
685 
686         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
687         if (status)
688                 return status;
689 
690         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
691                 return nfserr_inval;
692 
693         getattr->ga_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
694         getattr->ga_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
695         getattr->ga_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
696 
697         getattr->ga_fhp = &cstate->current_fh;
698         return nfs_ok;
699 }
700 
701 static __be32
702 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
703            struct nfsd4_link *link)
704 {
705         __be32 status = nfserr_nofilehandle;
706 
707         if (!cstate->save_fh.fh_dentry)
708                 return status;
709         status = nfsd_link(rqstp, &cstate->current_fh,
710                            link->li_name, link->li_namelen, &cstate->save_fh);
711         if (!status)
712                 set_change_info(&link->li_cinfo, &cstate->current_fh);
713         return status;
714 }
715 
716 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
717 {
718         struct svc_fh tmp_fh;
719         __be32 ret;
720 
721         fh_init(&tmp_fh, NFS4_FHSIZE);
722         ret = exp_pseudoroot(rqstp, &tmp_fh);
723         if (ret)
724                 return ret;
725         if (tmp_fh.fh_dentry == fh->fh_dentry) {
726                 fh_put(&tmp_fh);
727                 return nfserr_noent;
728         }
729         fh_put(&tmp_fh);
730         return nfsd_lookup(rqstp, fh, "..", 2, fh);
731 }
732 
733 static __be32
734 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
735               void *arg)
736 {
737         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
738 }
739 
740 static __be32
741 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
742              struct nfsd4_lookup *lookup)
743 {
744         return nfsd_lookup(rqstp, &cstate->current_fh,
745                            lookup->lo_name, lookup->lo_len,
746                            &cstate->current_fh);
747 }
748 
749 static __be32
750 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
751            struct nfsd4_read *read)
752 {
753         __be32 status;
754 
755         /* no need to check permission - this will be done in nfsd_read() */
756 
757         read->rd_filp = NULL;
758         if (read->rd_offset >= OFFSET_MAX)
759                 return nfserr_inval;
760 
761         /*
762          * If we do a zero copy read, then a client will see read data
763          * that reflects the state of the file *after* performing the
764          * following compound.
765          *
766          * To ensure proper ordering, we therefore turn off zero copy if
767          * the client wants us to do more in this compound:
768          */
769         if (!nfsd4_last_compound_op(rqstp))
770                 rqstp->rq_splice_ok = false;
771 
772         nfs4_lock_state();
773         /* check stateid */
774         if ((status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
775                                                  cstate, &read->rd_stateid,
776                                                  RD_STATE, &read->rd_filp))) {
777                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
778                 goto out;
779         }
780         if (read->rd_filp)
781                 get_file(read->rd_filp);
782         status = nfs_ok;
783 out:
784         nfs4_unlock_state();
785         read->rd_rqstp = rqstp;
786         read->rd_fhp = &cstate->current_fh;
787         return status;
788 }
789 
790 static __be32
791 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
792               struct nfsd4_readdir *readdir)
793 {
794         u64 cookie = readdir->rd_cookie;
795         static const nfs4_verifier zeroverf;
796 
797         /* no need to check permission - this will be done in nfsd_readdir() */
798 
799         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
800                 return nfserr_inval;
801 
802         readdir->rd_bmval[0] &= nfsd_suppattrs0(cstate->minorversion);
803         readdir->rd_bmval[1] &= nfsd_suppattrs1(cstate->minorversion);
804         readdir->rd_bmval[2] &= nfsd_suppattrs2(cstate->minorversion);
805 
806         if ((cookie == 1) || (cookie == 2) ||
807             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
808                 return nfserr_bad_cookie;
809 
810         readdir->rd_rqstp = rqstp;
811         readdir->rd_fhp = &cstate->current_fh;
812         return nfs_ok;
813 }
814 
815 static __be32
816 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
817                struct nfsd4_readlink *readlink)
818 {
819         readlink->rl_rqstp = rqstp;
820         readlink->rl_fhp = &cstate->current_fh;
821         return nfs_ok;
822 }
823 
824 static __be32
825 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
826              struct nfsd4_remove *remove)
827 {
828         __be32 status;
829 
830         if (locks_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              struct nfsd4_rename *rename)
844 {
845         __be32 status = nfserr_nofilehandle;
846 
847         if (!cstate->save_fh.fh_dentry)
848                 return status;
849         if (locks_in_grace(SVC_NET(rqstp)) &&
850                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
851                 return nfserr_grace;
852         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
853                              rename->rn_snamelen, &cstate->current_fh,
854                              rename->rn_tname, rename->rn_tnamelen);
855         if (status)
856                 return status;
857         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
858         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
859         return nfs_ok;
860 }
861 
862 static __be32
863 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
864               struct nfsd4_secinfo *secinfo)
865 {
866         struct svc_fh resfh;
867         struct svc_export *exp;
868         struct dentry *dentry;
869         __be32 err;
870 
871         fh_init(&resfh, NFS4_FHSIZE);
872         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
873         if (err)
874                 return err;
875         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
876                                     secinfo->si_name, secinfo->si_namelen,
877                                     &exp, &dentry);
878         if (err)
879                 return err;
880         if (dentry->d_inode == NULL) {
881                 exp_put(exp);
882                 err = nfserr_noent;
883         } else
884                 secinfo->si_exp = exp;
885         dput(dentry);
886         if (cstate->minorversion)
887                 /* See rfc 5661 section 2.6.3.1.1.8 */
888                 fh_put(&cstate->current_fh);
889         return err;
890 }
891 
892 static __be32
893 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
894               struct nfsd4_secinfo_no_name *sin)
895 {
896         __be32 err;
897 
898         switch (sin->sin_style) {
899         case NFS4_SECINFO_STYLE4_CURRENT_FH:
900                 break;
901         case NFS4_SECINFO_STYLE4_PARENT:
902                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
903                 if (err)
904                         return err;
905                 break;
906         default:
907                 return nfserr_inval;
908         }
909         exp_get(cstate->current_fh.fh_export);
910         sin->sin_exp = cstate->current_fh.fh_export;
911         fh_put(&cstate->current_fh);
912         return nfs_ok;
913 }
914 
915 static __be32
916 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
917               struct nfsd4_setattr *setattr)
918 {
919         __be32 status = nfs_ok;
920         int err;
921 
922         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
923                 nfs4_lock_state();
924                 status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate,
925                         &setattr->sa_stateid, WR_STATE, NULL);
926                 nfs4_unlock_state();
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         nfs4_lock_state();
993         status = nfs4_preprocess_stateid_op(SVC_NET(rqstp),
994                                         cstate, stateid, WR_STATE, &filp);
995         if (status) {
996                 nfs4_unlock_state();
997                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
998                 return status;
999         }
1000         if (filp)
1001                 get_file(filp);
1002         nfs4_unlock_state();
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_write(rqstp, &cstate->current_fh, filp,
1012                              write->wr_offset, rqstp->rq_vec, nvecs,
1013                              &cnt, &write->wr_how_written);
1014         if (filp)
1015                 fput(filp);
1016 
1017         write->wr_bytes_written = cnt;
1018 
1019         return status;
1020 }
1021 
1022 /* This routine never returns NFS_OK!  If there are no other errors, it
1023  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1024  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1025  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1026  */
1027 static __be32
1028 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1029              struct nfsd4_verify *verify)
1030 {
1031         __be32 *buf, *p;
1032         int count;
1033         __be32 status;
1034 
1035         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1036         if (status)
1037                 return status;
1038 
1039         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1040         if (status)
1041                 return status;
1042 
1043         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1044             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1045                 return nfserr_inval;
1046         if (verify->ve_attrlen & 3)
1047                 return nfserr_inval;
1048 
1049         /* count in words:
1050          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1051          */
1052         count = 4 + (verify->ve_attrlen >> 2);
1053         buf = kmalloc(count << 2, GFP_KERNEL);
1054         if (!buf)
1055                 return nfserr_jukebox;
1056 
1057         p = buf;
1058         status = nfsd4_encode_fattr(&cstate->current_fh,
1059                                     cstate->current_fh.fh_export,
1060                                     cstate->current_fh.fh_dentry, &p,
1061                                     count, verify->ve_bmval,
1062                                     rqstp, 0);
1063 
1064         /* this means that nfsd4_encode_fattr() ran out of space */
1065         if (status == nfserr_resource)
1066                 status = nfserr_not_same;
1067         if (status)
1068                 goto out_kfree;
1069 
1070         /* skip bitmap */
1071         p = buf + 1 + ntohl(buf[0]);
1072         status = nfserr_not_same;
1073         if (ntohl(*p++) != verify->ve_attrlen)
1074                 goto out_kfree;
1075         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1076                 status = nfserr_same;
1077 
1078 out_kfree:
1079         kfree(buf);
1080         return status;
1081 }
1082 
1083 static __be32
1084 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1085               struct nfsd4_verify *verify)
1086 {
1087         __be32 status;
1088 
1089         status = _nfsd4_verify(rqstp, cstate, verify);
1090         return status == nfserr_not_same ? nfs_ok : status;
1091 }
1092 
1093 static __be32
1094 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1095              struct nfsd4_verify *verify)
1096 {
1097         __be32 status;
1098 
1099         status = _nfsd4_verify(rqstp, cstate, verify);
1100         return status == nfserr_same ? nfs_ok : status;
1101 }
1102 
1103 /*
1104  * NULL call.
1105  */
1106 static __be32
1107 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1108 {
1109         return nfs_ok;
1110 }
1111 
1112 static inline void nfsd4_increment_op_stats(u32 opnum)
1113 {
1114         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1115                 nfsdstats.nfs4_opcount[opnum]++;
1116 }
1117 
1118 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1119                               void *);
1120 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1121 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1122 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1123 
1124 enum nfsd4_op_flags {
1125         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1126         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1127         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1128         /* For rfc 5661 section 2.6.3.1.1: */
1129         OP_HANDLES_WRONGSEC = 1 << 3,
1130         OP_IS_PUTFH_LIKE = 1 << 4,
1131         /*
1132          * These are the ops whose result size we estimate before
1133          * encoding, to avoid performing an op then not being able to
1134          * respond or cache a response.  This includes writes and setattrs
1135          * as well as the operations usually called "nonidempotent":
1136          */
1137         OP_MODIFIES_SOMETHING = 1 << 5,
1138         /*
1139          * Cache compounds containing these ops in the xid-based drc:
1140          * We use the DRC for compounds containing non-idempotent
1141          * operations, *except* those that are 4.1-specific (since
1142          * sessions provide their own EOS), and except for stateful
1143          * operations other than setclientid and setclientid_confirm
1144          * (since sequence numbers provide EOS for open, lock, etc in
1145          * the v4.0 case).
1146          */
1147         OP_CACHEME = 1 << 6,
1148         /*
1149          * These are ops which clear current state id.
1150          */
1151         OP_CLEAR_STATEID = 1 << 7,
1152 };
1153 
1154 struct nfsd4_operation {
1155         nfsd4op_func op_func;
1156         u32 op_flags;
1157         char *op_name;
1158         /* Try to get response size before operation */
1159         nfsd4op_rsize op_rsize_bop;
1160         stateid_getter op_get_currentstateid;
1161         stateid_setter op_set_currentstateid;
1162 };
1163 
1164 static struct nfsd4_operation nfsd4_ops[];
1165 
1166 #ifdef NFSD_DEBUG
1167 static const char *nfsd4_op_name(unsigned opnum);
1168 #endif
1169 
1170 /*
1171  * Enforce NFSv4.1 COMPOUND ordering rules:
1172  *
1173  * Also note, enforced elsewhere:
1174  *      - SEQUENCE other than as first op results in
1175  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1176  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1177  *        (Enforced in nfsd4_bind_conn_to_session().)
1178  *      - DESTROY_SESSION must be the final operation in a compound, if
1179  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1180  *        (Enforced in nfsd4_destroy_session().)
1181  */
1182 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1183 {
1184         struct nfsd4_op *op = &args->ops[0];
1185 
1186         /* These ordering requirements don't apply to NFSv4.0: */
1187         if (args->minorversion == 0)
1188                 return nfs_ok;
1189         /* This is weird, but OK, not our problem: */
1190         if (args->opcnt == 0)
1191                 return nfs_ok;
1192         if (op->status == nfserr_op_illegal)
1193                 return nfs_ok;
1194         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1195                 return nfserr_op_not_in_session;
1196         if (op->opnum == OP_SEQUENCE)
1197                 return nfs_ok;
1198         if (args->opcnt != 1)
1199                 return nfserr_not_only_op;
1200         return nfs_ok;
1201 }
1202 
1203 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1204 {
1205         return &nfsd4_ops[op->opnum];
1206 }
1207 
1208 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1209 {
1210         return OPDESC(op)->op_flags & OP_CACHEME;
1211 }
1212 
1213 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1214 {
1215         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1216         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1217         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1218         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1219         struct nfsd4_operation *thisd;
1220         struct nfsd4_operation *nextd;
1221 
1222         thisd = OPDESC(this);
1223         /*
1224          * Most ops check wronsec on our own; only the putfh-like ops
1225          * have special rules.
1226          */
1227         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1228                 return false;
1229         /*
1230          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1231          * put-filehandle operation if we're not going to use the
1232          * result:
1233          */
1234         if (argp->opcnt == resp->opcnt)
1235                 return false;
1236         if (next->opnum == OP_ILLEGAL)
1237                 return false;
1238         nextd = OPDESC(next);
1239         /*
1240          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1241          * errors themselves as necessary; others should check for them
1242          * now:
1243          */
1244         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1245 }
1246 
1247 /*
1248  * COMPOUND call.
1249  */
1250 static __be32
1251 nfsd4_proc_compound(struct svc_rqst *rqstp,
1252                     struct nfsd4_compoundargs *args,
1253                     struct nfsd4_compoundres *resp)
1254 {
1255         struct nfsd4_op *op;
1256         struct nfsd4_operation *opdesc;
1257         struct nfsd4_compound_state *cstate = &resp->cstate;
1258         int             slack_bytes;
1259         u32             plen = 0;
1260         __be32          status;
1261 
1262         resp->xbuf = &rqstp->rq_res;
1263         resp->p = rqstp->rq_res.head[0].iov_base +
1264                                                 rqstp->rq_res.head[0].iov_len;
1265         resp->tagp = resp->p;
1266         /* reserve space for: taglen, tag, and opcnt */
1267         resp->p += 2 + XDR_QUADLEN(args->taglen);
1268         resp->end = rqstp->rq_res.head[0].iov_base + PAGE_SIZE;
1269         resp->taglen = args->taglen;
1270         resp->tag = args->tag;
1271         resp->opcnt = 0;
1272         resp->rqstp = rqstp;
1273         resp->cstate.minorversion = args->minorversion;
1274         resp->cstate.replay_owner = NULL;
1275         resp->cstate.session = NULL;
1276         fh_init(&resp->cstate.current_fh, NFS4_FHSIZE);
1277         fh_init(&resp->cstate.save_fh, NFS4_FHSIZE);
1278         /*
1279          * Don't use the deferral mechanism for NFSv4; compounds make it
1280          * too hard to avoid non-idempotency problems.
1281          */
1282         rqstp->rq_usedeferral = 0;
1283 
1284         /*
1285          * According to RFC3010, this takes precedence over all other errors.
1286          */
1287         status = nfserr_minor_vers_mismatch;
1288         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1289                 goto out;
1290 
1291         status = nfs41_check_op_ordering(args);
1292         if (status) {
1293                 op = &args->ops[0];
1294                 op->status = status;
1295                 goto encode_op;
1296         }
1297 
1298         while (!status && resp->opcnt < args->opcnt) {
1299                 op = &args->ops[resp->opcnt++];
1300 
1301                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1302                         resp->opcnt, args->opcnt, op->opnum,
1303                         nfsd4_op_name(op->opnum));
1304                 /*
1305                  * The XDR decode routines may have pre-set op->status;
1306                  * for example, if there is a miscellaneous XDR error
1307                  * it will be set to nfserr_bad_xdr.
1308                  */
1309                 if (op->status) {
1310                         if (op->opnum == OP_OPEN)
1311                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1312                         goto encode_op;
1313                 }
1314 
1315                 /* We must be able to encode a successful response to
1316                  * this operation, with enough room left over to encode a
1317                  * failed response to the next operation.  If we don't
1318                  * have enough room, fail with ERR_RESOURCE.
1319                  */
1320                 slack_bytes = (char *)resp->end - (char *)resp->p;
1321                 if (slack_bytes < COMPOUND_SLACK_SPACE
1322                                 + COMPOUND_ERR_SLACK_SPACE) {
1323                         BUG_ON(slack_bytes < COMPOUND_ERR_SLACK_SPACE);
1324                         op->status = nfserr_resource;
1325                         goto encode_op;
1326                 }
1327 
1328                 opdesc = OPDESC(op);
1329 
1330                 if (!cstate->current_fh.fh_dentry) {
1331                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1332                                 op->status = nfserr_nofilehandle;
1333                                 goto encode_op;
1334                         }
1335                 } else if (cstate->current_fh.fh_export->ex_fslocs.migrated &&
1336                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1337                         op->status = nfserr_moved;
1338                         goto encode_op;
1339                 }
1340 
1341                 /* If op is non-idempotent */
1342                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1343                         plen = opdesc->op_rsize_bop(rqstp, op);
1344                         /*
1345                          * If there's still another operation, make sure
1346                          * we'll have space to at least encode an error:
1347                          */
1348                         if (resp->opcnt < args->opcnt)
1349                                 plen += COMPOUND_ERR_SLACK_SPACE;
1350                         op->status = nfsd4_check_resp_size(resp, plen);
1351                 }
1352 
1353                 if (op->status)
1354                         goto encode_op;
1355 
1356                 if (opdesc->op_get_currentstateid)
1357                         opdesc->op_get_currentstateid(cstate, &op->u);
1358                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1359 
1360                 if (!op->status) {
1361                         if (opdesc->op_set_currentstateid)
1362                                 opdesc->op_set_currentstateid(cstate, &op->u);
1363 
1364                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1365                                 clear_current_stateid(cstate);
1366 
1367                         if (need_wrongsec_check(rqstp))
1368                                 op->status = check_nfsd_access(cstate->current_fh.fh_export, rqstp);
1369                 }
1370 
1371 encode_op:
1372                 /* Only from SEQUENCE */
1373                 if (resp->cstate.status == nfserr_replay_cache) {
1374                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1375                         status = op->status;
1376                         goto out;
1377                 }
1378                 if (op->status == nfserr_replay_me) {
1379                         op->replay = &cstate->replay_owner->so_replay;
1380                         nfsd4_encode_replay(resp, op);
1381                         status = op->status = op->replay->rp_status;
1382                 } else {
1383                         nfsd4_encode_operation(resp, op);
1384                         status = op->status;
1385                 }
1386 
1387                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1388                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1389                         be32_to_cpu(status));
1390 
1391                 if (cstate->replay_owner) {
1392                         nfs4_unlock_state();
1393                         cstate->replay_owner = NULL;
1394                 }
1395                 /* XXX Ugh, we need to get rid of this kind of special case: */
1396                 if (op->opnum == OP_READ && op->u.read.rd_filp)
1397                         fput(op->u.read.rd_filp);
1398 
1399                 nfsd4_increment_op_stats(op->opnum);
1400         }
1401 
1402         resp->cstate.status = status;
1403         fh_put(&resp->cstate.current_fh);
1404         fh_put(&resp->cstate.save_fh);
1405         BUG_ON(resp->cstate.replay_owner);
1406 out:
1407         /* Reset deferral mechanism for RPC deferrals */
1408         rqstp->rq_usedeferral = 1;
1409         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1410         return status;
1411 }
1412 
1413 #define op_encode_hdr_size              (2)
1414 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1415 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1416 #define op_encode_change_info_maxsz     (5)
1417 #define nfs4_fattr_bitmap_maxsz         (4)
1418 
1419 #define op_encode_lockowner_maxsz       (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1420 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1421 
1422 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1423 
1424 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1425 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1426                                          op_encode_ace_maxsz)
1427 
1428 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1429 
1430 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1431 {
1432         return (op_encode_hdr_size) * sizeof(__be32);
1433 }
1434 
1435 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1436 {
1437         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1438 }
1439 
1440 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1441 {
1442         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1443 }
1444 
1445 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1446 {
1447         return (op_encode_hdr_size + op_encode_change_info_maxsz
1448                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1449 }
1450 
1451 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1452 {
1453         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1454                 * sizeof(__be32);
1455 }
1456 
1457 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1458 {
1459         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1460                 * sizeof(__be32);
1461 }
1462 
1463 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1464 {
1465         return (op_encode_hdr_size + op_encode_stateid_maxsz
1466                 + op_encode_change_info_maxsz + 1
1467                 + nfs4_fattr_bitmap_maxsz
1468                 + op_encode_delegation_maxsz) * sizeof(__be32);
1469 }
1470 
1471 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1472 {
1473         u32 maxcount = 0, rlen = 0;
1474 
1475         maxcount = svc_max_payload(rqstp);
1476         rlen = op->u.read.rd_length;
1477 
1478         if (rlen > maxcount)
1479                 rlen = maxcount;
1480 
1481         return (op_encode_hdr_size + 2) * sizeof(__be32) + rlen;
1482 }
1483 
1484 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1485 {
1486         u32 rlen = op->u.readdir.rd_maxcount;
1487 
1488         if (rlen > PAGE_SIZE)
1489                 rlen = PAGE_SIZE;
1490 
1491         return (op_encode_hdr_size + op_encode_verifier_maxsz)
1492                  * sizeof(__be32) + rlen;
1493 }
1494 
1495 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1496 {
1497         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1498                 * sizeof(__be32);
1499 }
1500 
1501 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1502 {
1503         return (op_encode_hdr_size + op_encode_change_info_maxsz
1504                 + op_encode_change_info_maxsz) * sizeof(__be32);
1505 }
1506 
1507 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1508 {
1509         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1510 }
1511 
1512 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1513 {
1514         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1515                                                                 sizeof(__be32);
1516 }
1517 
1518 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1519 {
1520         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1521 }
1522 
1523 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1524 {
1525         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1526                 1 + 1 + 2 + /* eir_flags, spr_how, spo_must_enforce & _allow */\
1527                 2 + /*eir_server_owner.so_minor_id */\
1528                 /* eir_server_owner.so_major_id<> */\
1529                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1530                 /* eir_server_scope<> */\
1531                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1532                 1 + /* eir_server_impl_id array length */\
1533                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1534 }
1535 
1536 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1537 {
1538         return (op_encode_hdr_size + \
1539                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1540                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1541 }
1542 
1543 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1544 {
1545         return (op_encode_hdr_size + \
1546                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1547                 2 + /* csr_sequence, csr_flags */\
1548                 op_encode_channel_attrs_maxsz + \
1549                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1550 }
1551 
1552 static struct nfsd4_operation nfsd4_ops[] = {
1553         [OP_ACCESS] = {
1554                 .op_func = (nfsd4op_func)nfsd4_access,
1555                 .op_name = "OP_ACCESS",
1556         },
1557         [OP_CLOSE] = {
1558                 .op_func = (nfsd4op_func)nfsd4_close,
1559                 .op_flags = OP_MODIFIES_SOMETHING,
1560                 .op_name = "OP_CLOSE",
1561                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1562                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
1563                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
1564         },
1565         [OP_COMMIT] = {
1566                 .op_func = (nfsd4op_func)nfsd4_commit,
1567                 .op_flags = OP_MODIFIES_SOMETHING,
1568                 .op_name = "OP_COMMIT",
1569                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
1570         },
1571         [OP_CREATE] = {
1572                 .op_func = (nfsd4op_func)nfsd4_create,
1573                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
1574                 .op_name = "OP_CREATE",
1575                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
1576         },
1577         [OP_DELEGRETURN] = {
1578                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
1579                 .op_flags = OP_MODIFIES_SOMETHING,
1580                 .op_name = "OP_DELEGRETURN",
1581                 .op_rsize_bop = nfsd4_only_status_rsize,
1582                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
1583         },
1584         [OP_GETATTR] = {
1585                 .op_func = (nfsd4op_func)nfsd4_getattr,
1586                 .op_flags = ALLOWED_ON_ABSENT_FS,
1587                 .op_name = "OP_GETATTR",
1588         },
1589         [OP_GETFH] = {
1590                 .op_func = (nfsd4op_func)nfsd4_getfh,
1591                 .op_name = "OP_GETFH",
1592         },
1593         [OP_LINK] = {
1594                 .op_func = (nfsd4op_func)nfsd4_link,
1595                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
1596                                 | OP_CACHEME,
1597                 .op_name = "OP_LINK",
1598                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
1599         },
1600         [OP_LOCK] = {
1601                 .op_func = (nfsd4op_func)nfsd4_lock,
1602                 .op_flags = OP_MODIFIES_SOMETHING,
1603                 .op_name = "OP_LOCK",
1604                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
1605                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
1606         },
1607         [OP_LOCKT] = {
1608                 .op_func = (nfsd4op_func)nfsd4_lockt,
1609                 .op_name = "OP_LOCKT",
1610         },
1611         [OP_LOCKU] = {
1612                 .op_func = (nfsd4op_func)nfsd4_locku,
1613                 .op_flags = OP_MODIFIES_SOMETHING,
1614                 .op_name = "OP_LOCKU",
1615                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1616                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
1617         },
1618         [OP_LOOKUP] = {
1619                 .op_func = (nfsd4op_func)nfsd4_lookup,
1620                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1621                 .op_name = "OP_LOOKUP",
1622         },
1623         [OP_LOOKUPP] = {
1624                 .op_func = (nfsd4op_func)nfsd4_lookupp,
1625                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
1626                 .op_name = "OP_LOOKUPP",
1627         },
1628         [OP_NVERIFY] = {
1629                 .op_func = (nfsd4op_func)nfsd4_nverify,
1630                 .op_name = "OP_NVERIFY",
1631         },
1632         [OP_OPEN] = {
1633                 .op_func = (nfsd4op_func)nfsd4_open,
1634                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1635                 .op_name = "OP_OPEN",
1636                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
1637                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
1638         },
1639         [OP_OPEN_CONFIRM] = {
1640                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
1641                 .op_flags = OP_MODIFIES_SOMETHING,
1642                 .op_name = "OP_OPEN_CONFIRM",
1643                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1644         },
1645         [OP_OPEN_DOWNGRADE] = {
1646                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
1647                 .op_flags = OP_MODIFIES_SOMETHING,
1648                 .op_name = "OP_OPEN_DOWNGRADE",
1649                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
1650                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
1651                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
1652         },
1653         [OP_PUTFH] = {
1654                 .op_func = (nfsd4op_func)nfsd4_putfh,
1655                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1656                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1657                                 | OP_CLEAR_STATEID,
1658                 .op_name = "OP_PUTFH",
1659                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1660         },
1661         [OP_PUTPUBFH] = {
1662                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1663                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1664                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1665                                 | OP_CLEAR_STATEID,
1666                 .op_name = "OP_PUTPUBFH",
1667                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1668         },
1669         [OP_PUTROOTFH] = {
1670                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
1671                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1672                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING
1673                                 | OP_CLEAR_STATEID,
1674                 .op_name = "OP_PUTROOTFH",
1675                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1676         },
1677         [OP_READ] = {
1678                 .op_func = (nfsd4op_func)nfsd4_read,
1679                 .op_flags = OP_MODIFIES_SOMETHING,
1680                 .op_name = "OP_READ",
1681                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
1682                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
1683         },
1684         [OP_READDIR] = {
1685                 .op_func = (nfsd4op_func)nfsd4_readdir,
1686                 .op_flags = OP_MODIFIES_SOMETHING,
1687                 .op_name = "OP_READDIR",
1688                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
1689         },
1690         [OP_READLINK] = {
1691                 .op_func = (nfsd4op_func)nfsd4_readlink,
1692                 .op_name = "OP_READLINK",
1693         },
1694         [OP_REMOVE] = {
1695                 .op_func = (nfsd4op_func)nfsd4_remove,
1696                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1697                 .op_name = "OP_REMOVE",
1698                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
1699         },
1700         [OP_RENAME] = {
1701                 .op_func = (nfsd4op_func)nfsd4_rename,
1702                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1703                 .op_name = "OP_RENAME",
1704                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
1705         },
1706         [OP_RENEW] = {
1707                 .op_func = (nfsd4op_func)nfsd4_renew,
1708                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1709                                 | OP_MODIFIES_SOMETHING,
1710                 .op_name = "OP_RENEW",
1711                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1712 
1713         },
1714         [OP_RESTOREFH] = {
1715                 .op_func = (nfsd4op_func)nfsd4_restorefh,
1716                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1717                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
1718                 .op_name = "OP_RESTOREFH",
1719                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1720         },
1721         [OP_SAVEFH] = {
1722                 .op_func = (nfsd4op_func)nfsd4_savefh,
1723                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
1724                 .op_name = "OP_SAVEFH",
1725                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1726         },
1727         [OP_SECINFO] = {
1728                 .op_func = (nfsd4op_func)nfsd4_secinfo,
1729                 .op_flags = OP_HANDLES_WRONGSEC,
1730                 .op_name = "OP_SECINFO",
1731         },
1732         [OP_SETATTR] = {
1733                 .op_func = (nfsd4op_func)nfsd4_setattr,
1734                 .op_name = "OP_SETATTR",
1735                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1736                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
1737                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
1738         },
1739         [OP_SETCLIENTID] = {
1740                 .op_func = (nfsd4op_func)nfsd4_setclientid,
1741                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1742                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1743                 .op_name = "OP_SETCLIENTID",
1744                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
1745         },
1746         [OP_SETCLIENTID_CONFIRM] = {
1747                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
1748                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1749                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
1750                 .op_name = "OP_SETCLIENTID_CONFIRM",
1751                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1752         },
1753         [OP_VERIFY] = {
1754                 .op_func = (nfsd4op_func)nfsd4_verify,
1755                 .op_name = "OP_VERIFY",
1756         },
1757         [OP_WRITE] = {
1758                 .op_func = (nfsd4op_func)nfsd4_write,
1759                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
1760                 .op_name = "OP_WRITE",
1761                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
1762                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
1763         },
1764         [OP_RELEASE_LOCKOWNER] = {
1765                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
1766                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
1767                                 | OP_MODIFIES_SOMETHING,
1768                 .op_name = "OP_RELEASE_LOCKOWNER",
1769                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1770         },
1771 
1772         /* NFSv4.1 operations */
1773         [OP_EXCHANGE_ID] = {
1774                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
1775                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1776                                 | OP_MODIFIES_SOMETHING,
1777                 .op_name = "OP_EXCHANGE_ID",
1778                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
1779         },
1780         [OP_BACKCHANNEL_CTL] = {
1781                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
1782                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1783                 .op_name = "OP_BACKCHANNEL_CTL",
1784                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1785         },
1786         [OP_BIND_CONN_TO_SESSION] = {
1787                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
1788                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1789                                 | OP_MODIFIES_SOMETHING,
1790                 .op_name = "OP_BIND_CONN_TO_SESSION",
1791                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
1792         },
1793         [OP_CREATE_SESSION] = {
1794                 .op_func = (nfsd4op_func)nfsd4_create_session,
1795                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1796                                 | OP_MODIFIES_SOMETHING,
1797                 .op_name = "OP_CREATE_SESSION",
1798                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
1799         },
1800         [OP_DESTROY_SESSION] = {
1801                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
1802                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1803                                 | OP_MODIFIES_SOMETHING,
1804                 .op_name = "OP_DESTROY_SESSION",
1805                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1806         },
1807         [OP_SEQUENCE] = {
1808                 .op_func = (nfsd4op_func)nfsd4_sequence,
1809                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
1810                 .op_name = "OP_SEQUENCE",
1811         },
1812         [OP_DESTROY_CLIENTID] = {
1813                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
1814                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
1815                                 | OP_MODIFIES_SOMETHING,
1816                 .op_name = "OP_DESTROY_CLIENTID",
1817                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1818         },
1819         [OP_RECLAIM_COMPLETE] = {
1820                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
1821                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1822                 .op_name = "OP_RECLAIM_COMPLETE",
1823                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1824         },
1825         [OP_SECINFO_NO_NAME] = {
1826                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
1827                 .op_flags = OP_HANDLES_WRONGSEC,
1828                 .op_name = "OP_SECINFO_NO_NAME",
1829         },
1830         [OP_TEST_STATEID] = {
1831                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
1832                 .op_flags = ALLOWED_WITHOUT_FH,
1833                 .op_name = "OP_TEST_STATEID",
1834         },
1835         [OP_FREE_STATEID] = {
1836                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
1837                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
1838                 .op_name = "OP_FREE_STATEID",
1839                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
1840                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
1841         },
1842 };
1843 
1844 #ifdef NFSD_DEBUG
1845 static const char *nfsd4_op_name(unsigned opnum)
1846 {
1847         if (opnum < ARRAY_SIZE(nfsd4_ops))
1848                 return nfsd4_ops[opnum].op_name;
1849         return "unknown_operation";
1850 }
1851 #endif
1852 
1853 #define nfsd4_voidres                   nfsd4_voidargs
1854 struct nfsd4_voidargs { int dummy; };
1855 
1856 static struct svc_procedure             nfsd_procedures4[2] = {
1857         [NFSPROC4_NULL] = {
1858                 .pc_func = (svc_procfunc) nfsd4_proc_null,
1859                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
1860                 .pc_argsize = sizeof(struct nfsd4_voidargs),
1861                 .pc_ressize = sizeof(struct nfsd4_voidres),
1862                 .pc_cachetype = RC_NOCACHE,
1863                 .pc_xdrressize = 1,
1864         },
1865         [NFSPROC4_COMPOUND] = {
1866                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
1867                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
1868                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
1869                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
1870                 .pc_ressize = sizeof(struct nfsd4_compoundres),
1871                 .pc_release = nfsd4_release_compoundargs,
1872                 .pc_cachetype = RC_NOCACHE,
1873                 .pc_xdrressize = NFSD_BUFSIZE/4,
1874         },
1875 };
1876 
1877 struct svc_version      nfsd_version4 = {
1878                 .vs_vers        = 4,
1879                 .vs_nproc       = 2,
1880                 .vs_proc        = nfsd_procedures4,
1881                 .vs_dispatch    = nfsd_dispatch,
1882                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
1883 };
1884 
1885 /*
1886  * Local variables:
1887  *  c-basic-offset: 8
1888  * End:
1889  */
1890 

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