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TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfs4proc.c

Version: ~ [ linux-5.2 ] ~ [ linux-5.1.16 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.57 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.132 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.184 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.184 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.69 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Server-side procedures for NFSv4.
  3  *
  4  *  Copyright (c) 2002 The Regents of the University of Michigan.
  5  *  All rights reserved.
  6  *
  7  *  Kendrick Smith <kmsmith@umich.edu>
  8  *  Andy Adamson   <andros@umich.edu>
  9  *
 10  *  Redistribution and use in source and binary forms, with or without
 11  *  modification, are permitted provided that the following conditions
 12  *  are met:
 13  *
 14  *  1. Redistributions of source code must retain the above copyright
 15  *     notice, this list of conditions and the following disclaimer.
 16  *  2. Redistributions in binary form must reproduce the above copyright
 17  *     notice, this list of conditions and the following disclaimer in the
 18  *     documentation and/or other materials provided with the distribution.
 19  *  3. Neither the name of the University nor the names of its
 20  *     contributors may be used to endorse or promote products derived
 21  *     from this software without specific prior written permission.
 22  *
 23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 34  */
 35 #include <linux/file.h>
 36 #include <linux/falloc.h>
 37 #include <linux/slab.h>
 38 
 39 #include "idmap.h"
 40 #include "cache.h"
 41 #include "xdr4.h"
 42 #include "vfs.h"
 43 #include "current_stateid.h"
 44 #include "netns.h"
 45 #include "acl.h"
 46 #include "pnfs.h"
 47 #include "trace.h"
 48 
 49 #ifdef CONFIG_NFSD_V4_SECURITY_LABEL
 50 #include <linux/security.h>
 51 
 52 static inline void
 53 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 54 {
 55         struct inode *inode = d_inode(resfh->fh_dentry);
 56         int status;
 57 
 58         inode_lock(inode);
 59         status = security_inode_setsecctx(resfh->fh_dentry,
 60                 label->data, label->len);
 61         inode_unlock(inode);
 62 
 63         if (status)
 64                 /*
 65                  * XXX: We should really fail the whole open, but we may
 66                  * already have created a new file, so it may be too
 67                  * late.  For now this seems the least of evils:
 68                  */
 69                 bmval[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
 70 
 71         return;
 72 }
 73 #else
 74 static inline void
 75 nfsd4_security_inode_setsecctx(struct svc_fh *resfh, struct xdr_netobj *label, u32 *bmval)
 76 { }
 77 #endif
 78 
 79 #define NFSDDBG_FACILITY                NFSDDBG_PROC
 80 
 81 static u32 nfsd_attrmask[] = {
 82         NFSD_WRITEABLE_ATTRS_WORD0,
 83         NFSD_WRITEABLE_ATTRS_WORD1,
 84         NFSD_WRITEABLE_ATTRS_WORD2
 85 };
 86 
 87 static u32 nfsd41_ex_attrmask[] = {
 88         NFSD_SUPPATTR_EXCLCREAT_WORD0,
 89         NFSD_SUPPATTR_EXCLCREAT_WORD1,
 90         NFSD_SUPPATTR_EXCLCREAT_WORD2
 91 };
 92 
 93 static __be32
 94 check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 95                    u32 *bmval, u32 *writable)
 96 {
 97         struct dentry *dentry = cstate->current_fh.fh_dentry;
 98 
 99         if (!nfsd_attrs_supported(cstate->minorversion, bmval))
100                 return nfserr_attrnotsupp;
101         if ((bmval[0] & FATTR4_WORD0_ACL) && !IS_POSIXACL(d_inode(dentry)))
102                 return nfserr_attrnotsupp;
103         if (writable && !bmval_is_subset(bmval, writable))
104                 return nfserr_inval;
105         if (writable && (bmval[2] & FATTR4_WORD2_MODE_UMASK) &&
106                         (bmval[1] & FATTR4_WORD1_MODE))
107                 return nfserr_inval;
108         return nfs_ok;
109 }
110 
111 static __be32
112 nfsd4_check_open_attributes(struct svc_rqst *rqstp,
113         struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
114 {
115         __be32 status = nfs_ok;
116 
117         if (open->op_create == NFS4_OPEN_CREATE) {
118                 if (open->op_createmode == NFS4_CREATE_UNCHECKED
119                     || open->op_createmode == NFS4_CREATE_GUARDED)
120                         status = check_attr_support(rqstp, cstate,
121                                         open->op_bmval, nfsd_attrmask);
122                 else if (open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1)
123                         status = check_attr_support(rqstp, cstate,
124                                         open->op_bmval, nfsd41_ex_attrmask);
125         }
126 
127         return status;
128 }
129 
130 static int
131 is_create_with_attrs(struct nfsd4_open *open)
132 {
133         return open->op_create == NFS4_OPEN_CREATE
134                 && (open->op_createmode == NFS4_CREATE_UNCHECKED
135                     || open->op_createmode == NFS4_CREATE_GUARDED
136                     || open->op_createmode == NFS4_CREATE_EXCLUSIVE4_1);
137 }
138 
139 /*
140  * if error occurs when setting the acl, just clear the acl bit
141  * in the returned attr bitmap.
142  */
143 static void
144 do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
145                 struct nfs4_acl *acl, u32 *bmval)
146 {
147         __be32 status;
148 
149         status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
150         if (status)
151                 /*
152                  * We should probably fail the whole open at this point,
153                  * but we've already created the file, so it's too late;
154                  * So this seems the least of evils:
155                  */
156                 bmval[0] &= ~FATTR4_WORD0_ACL;
157 }
158 
159 static inline void
160 fh_dup2(struct svc_fh *dst, struct svc_fh *src)
161 {
162         fh_put(dst);
163         dget(src->fh_dentry);
164         if (src->fh_export)
165                 exp_get(src->fh_export);
166         *dst = *src;
167 }
168 
169 static __be32
170 do_open_permission(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open, int accmode)
171 {
172         __be32 status;
173 
174         if (open->op_truncate &&
175                 !(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
176                 return nfserr_inval;
177 
178         accmode |= NFSD_MAY_READ_IF_EXEC;
179 
180         if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
181                 accmode |= NFSD_MAY_READ;
182         if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
183                 accmode |= (NFSD_MAY_WRITE | NFSD_MAY_TRUNC);
184         if (open->op_share_deny & NFS4_SHARE_DENY_READ)
185                 accmode |= NFSD_MAY_WRITE;
186 
187         status = fh_verify(rqstp, current_fh, S_IFREG, accmode);
188 
189         return status;
190 }
191 
192 static __be32 nfsd_check_obj_isreg(struct svc_fh *fh)
193 {
194         umode_t mode = d_inode(fh->fh_dentry)->i_mode;
195 
196         if (S_ISREG(mode))
197                 return nfs_ok;
198         if (S_ISDIR(mode))
199                 return nfserr_isdir;
200         /*
201          * Using err_symlink as our catch-all case may look odd; but
202          * there's no other obvious error for this case in 4.0, and we
203          * happen to know that it will cause the linux v4 client to do
204          * the right thing on attempts to open something other than a
205          * regular file.
206          */
207         return nfserr_symlink;
208 }
209 
210 static void nfsd4_set_open_owner_reply_cache(struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh *resfh)
211 {
212         if (nfsd4_has_session(cstate))
213                 return;
214         fh_copy_shallow(&open->op_openowner->oo_owner.so_replay.rp_openfh,
215                         &resfh->fh_handle);
216 }
217 
218 static __be32
219 do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open, struct svc_fh **resfh)
220 {
221         struct svc_fh *current_fh = &cstate->current_fh;
222         int accmode;
223         __be32 status;
224 
225         *resfh = kmalloc(sizeof(struct svc_fh), GFP_KERNEL);
226         if (!*resfh)
227                 return nfserr_jukebox;
228         fh_init(*resfh, NFS4_FHSIZE);
229         open->op_truncate = 0;
230 
231         if (open->op_create) {
232                 /* FIXME: check session persistence and pnfs flags.
233                  * The nfsv4.1 spec requires the following semantics:
234                  *
235                  * Persistent   | pNFS   | Server REQUIRED | Client Allowed
236                  * Reply Cache  | server |                 |
237                  * -------------+--------+-----------------+--------------------
238                  * no           | no     | EXCLUSIVE4_1    | EXCLUSIVE4_1
239                  *              |        |                 | (SHOULD)
240                  *              |        | and EXCLUSIVE4  | or EXCLUSIVE4
241                  *              |        |                 | (SHOULD NOT)
242                  * no           | yes    | EXCLUSIVE4_1    | EXCLUSIVE4_1
243                  * yes          | no     | GUARDED4        | GUARDED4
244                  * yes          | yes    | GUARDED4        | GUARDED4
245                  */
246 
247                 /*
248                  * Note: create modes (UNCHECKED,GUARDED...) are the same
249                  * in NFSv4 as in v3 except EXCLUSIVE4_1.
250                  */
251                 status = do_nfsd_create(rqstp, current_fh, open->op_fname.data,
252                                         open->op_fname.len, &open->op_iattr,
253                                         *resfh, open->op_createmode,
254                                         (u32 *)open->op_verf.data,
255                                         &open->op_truncate, &open->op_created);
256 
257                 if (!status && open->op_label.len)
258                         nfsd4_security_inode_setsecctx(*resfh, &open->op_label, open->op_bmval);
259 
260                 /*
261                  * Following rfc 3530 14.2.16, and rfc 5661 18.16.4
262                  * use the returned bitmask to indicate which attributes
263                  * we used to store the verifier:
264                  */
265                 if (nfsd_create_is_exclusive(open->op_createmode) && status == 0)
266                         open->op_bmval[1] |= (FATTR4_WORD1_TIME_ACCESS |
267                                                 FATTR4_WORD1_TIME_MODIFY);
268         } else
269                 /*
270                  * Note this may exit with the parent still locked.
271                  * We will hold the lock until nfsd4_open's final
272                  * lookup, to prevent renames or unlinks until we've had
273                  * a chance to an acquire a delegation if appropriate.
274                  */
275                 status = nfsd_lookup(rqstp, current_fh,
276                                      open->op_fname.data, open->op_fname.len, *resfh);
277         if (status)
278                 goto out;
279         status = nfsd_check_obj_isreg(*resfh);
280         if (status)
281                 goto out;
282 
283         if (is_create_with_attrs(open) && open->op_acl != NULL)
284                 do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
285 
286         nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
287         accmode = NFSD_MAY_NOP;
288         if (open->op_created ||
289                         open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
290                 accmode |= NFSD_MAY_OWNER_OVERRIDE;
291         status = do_open_permission(rqstp, *resfh, open, accmode);
292         set_change_info(&open->op_cinfo, current_fh);
293 out:
294         return status;
295 }
296 
297 static __be32
298 do_open_fhandle(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
299 {
300         struct svc_fh *current_fh = &cstate->current_fh;
301         __be32 status;
302         int accmode = 0;
303 
304         /* We don't know the target directory, and therefore can not
305         * set the change info
306         */
307 
308         memset(&open->op_cinfo, 0, sizeof(struct nfsd4_change_info));
309 
310         nfsd4_set_open_owner_reply_cache(cstate, open, current_fh);
311 
312         open->op_truncate = (open->op_iattr.ia_valid & ATTR_SIZE) &&
313                 (open->op_iattr.ia_size == 0);
314         /*
315          * In the delegation case, the client is telling us about an
316          * open that it *already* performed locally, some time ago.  We
317          * should let it succeed now if possible.
318          *
319          * In the case of a CLAIM_FH open, on the other hand, the client
320          * may be counting on us to enforce permissions (the Linux 4.1
321          * client uses this for normal opens, for example).
322          */
323         if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH)
324                 accmode = NFSD_MAY_OWNER_OVERRIDE;
325 
326         status = do_open_permission(rqstp, current_fh, open, accmode);
327 
328         return status;
329 }
330 
331 static void
332 copy_clientid(clientid_t *clid, struct nfsd4_session *session)
333 {
334         struct nfsd4_sessionid *sid =
335                         (struct nfsd4_sessionid *)session->se_sessionid.data;
336 
337         clid->cl_boot = sid->clientid.cl_boot;
338         clid->cl_id = sid->clientid.cl_id;
339 }
340 
341 static __be32
342 nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
343            struct nfsd4_open *open)
344 {
345         __be32 status;
346         struct svc_fh *resfh = NULL;
347         struct net *net = SVC_NET(rqstp);
348         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
349 
350         dprintk("NFSD: nfsd4_open filename %.*s op_openowner %p\n",
351                 (int)open->op_fname.len, open->op_fname.data,
352                 open->op_openowner);
353 
354         /* This check required by spec. */
355         if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
356                 return nfserr_inval;
357 
358         open->op_created = 0;
359         /*
360          * RFC5661 18.51.3
361          * Before RECLAIM_COMPLETE done, server should deny new lock
362          */
363         if (nfsd4_has_session(cstate) &&
364             !test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
365                       &cstate->session->se_client->cl_flags) &&
366             open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
367                 return nfserr_grace;
368 
369         if (nfsd4_has_session(cstate))
370                 copy_clientid(&open->op_clientid, cstate->session);
371 
372         /* check seqid for replay. set nfs4_owner */
373         status = nfsd4_process_open1(cstate, open, nn);
374         if (status == nfserr_replay_me) {
375                 struct nfs4_replay *rp = &open->op_openowner->oo_owner.so_replay;
376                 fh_put(&cstate->current_fh);
377                 fh_copy_shallow(&cstate->current_fh.fh_handle,
378                                 &rp->rp_openfh);
379                 status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
380                 if (status)
381                         dprintk("nfsd4_open: replay failed"
382                                 " restoring previous filehandle\n");
383                 else
384                         status = nfserr_replay_me;
385         }
386         if (status)
387                 goto out;
388         if (open->op_xdr_error) {
389                 status = open->op_xdr_error;
390                 goto out;
391         }
392 
393         status = nfsd4_check_open_attributes(rqstp, cstate, open);
394         if (status)
395                 goto out;
396 
397         /* Openowner is now set, so sequence id will get bumped.  Now we need
398          * these checks before we do any creates: */
399         status = nfserr_grace;
400         if (opens_in_grace(net) && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
401                 goto out;
402         status = nfserr_no_grace;
403         if (!opens_in_grace(net) && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
404                 goto out;
405 
406         switch (open->op_claim_type) {
407                 case NFS4_OPEN_CLAIM_DELEGATE_CUR:
408                 case NFS4_OPEN_CLAIM_NULL:
409                         status = do_open_lookup(rqstp, cstate, open, &resfh);
410                         if (status)
411                                 goto out;
412                         break;
413                 case NFS4_OPEN_CLAIM_PREVIOUS:
414                         status = nfs4_check_open_reclaim(&open->op_clientid,
415                                                          cstate, nn);
416                         if (status)
417                                 goto out;
418                         open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
419                 case NFS4_OPEN_CLAIM_FH:
420                 case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
421                         status = do_open_fhandle(rqstp, cstate, open);
422                         if (status)
423                                 goto out;
424                         resfh = &cstate->current_fh;
425                         break;
426                 case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
427                 case NFS4_OPEN_CLAIM_DELEGATE_PREV:
428                         dprintk("NFSD: unsupported OPEN claim type %d\n",
429                                 open->op_claim_type);
430                         status = nfserr_notsupp;
431                         goto out;
432                 default:
433                         dprintk("NFSD: Invalid OPEN claim type %d\n",
434                                 open->op_claim_type);
435                         status = nfserr_inval;
436                         goto out;
437         }
438         /*
439          * nfsd4_process_open2() does the actual opening of the file.  If
440          * successful, it (1) truncates the file if open->op_truncate was
441          * set, (2) sets open->op_stateid, (3) sets open->op_delegation.
442          */
443         status = nfsd4_process_open2(rqstp, resfh, open);
444         WARN(status && open->op_created,
445              "nfsd4_process_open2 failed to open newly-created file! status=%u\n",
446              be32_to_cpu(status));
447 out:
448         if (resfh && resfh != &cstate->current_fh) {
449                 fh_dup2(&cstate->current_fh, resfh);
450                 fh_put(resfh);
451                 kfree(resfh);
452         }
453         nfsd4_cleanup_open_state(cstate, open);
454         nfsd4_bump_seqid(cstate, status);
455         return status;
456 }
457 
458 /*
459  * OPEN is the only seqid-mutating operation whose decoding can fail
460  * with a seqid-mutating error (specifically, decoding of user names in
461  * the attributes).  Therefore we have to do some processing to look up
462  * the stateowner so that we can bump the seqid.
463  */
464 static __be32 nfsd4_open_omfg(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_op *op)
465 {
466         struct nfsd4_open *open = (struct nfsd4_open *)&op->u;
467 
468         if (!seqid_mutating_err(ntohl(op->status)))
469                 return op->status;
470         if (nfsd4_has_session(cstate))
471                 return op->status;
472         open->op_xdr_error = op->status;
473         return nfsd4_open(rqstp, cstate, open);
474 }
475 
476 /*
477  * filehandle-manipulating ops.
478  */
479 static __be32
480 nfsd4_getfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
481             struct svc_fh **getfh)
482 {
483         if (!cstate->current_fh.fh_dentry)
484                 return nfserr_nofilehandle;
485 
486         *getfh = &cstate->current_fh;
487         return nfs_ok;
488 }
489 
490 static __be32
491 nfsd4_putfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
492             struct nfsd4_putfh *putfh)
493 {
494         fh_put(&cstate->current_fh);
495         cstate->current_fh.fh_handle.fh_size = putfh->pf_fhlen;
496         memcpy(&cstate->current_fh.fh_handle.fh_base, putfh->pf_fhval,
497                putfh->pf_fhlen);
498         return fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_BYPASS_GSS);
499 }
500 
501 static __be32
502 nfsd4_putrootfh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
503                 void *arg)
504 {
505         __be32 status;
506 
507         fh_put(&cstate->current_fh);
508         status = exp_pseudoroot(rqstp, &cstate->current_fh);
509         return status;
510 }
511 
512 static __be32
513 nfsd4_restorefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
514                 void *arg)
515 {
516         if (!cstate->save_fh.fh_dentry)
517                 return nfserr_restorefh;
518 
519         fh_dup2(&cstate->current_fh, &cstate->save_fh);
520         if (HAS_STATE_ID(cstate, SAVED_STATE_ID_FLAG)) {
521                 memcpy(&cstate->current_stateid, &cstate->save_stateid, sizeof(stateid_t));
522                 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
523         }
524         return nfs_ok;
525 }
526 
527 static __be32
528 nfsd4_savefh(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
529              void *arg)
530 {
531         if (!cstate->current_fh.fh_dentry)
532                 return nfserr_nofilehandle;
533 
534         fh_dup2(&cstate->save_fh, &cstate->current_fh);
535         if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG)) {
536                 memcpy(&cstate->save_stateid, &cstate->current_stateid, sizeof(stateid_t));
537                 SET_STATE_ID(cstate, SAVED_STATE_ID_FLAG);
538         }
539         return nfs_ok;
540 }
541 
542 /*
543  * misc nfsv4 ops
544  */
545 static __be32
546 nfsd4_access(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
547              struct nfsd4_access *access)
548 {
549         if (access->ac_req_access & ~NFS3_ACCESS_FULL)
550                 return nfserr_inval;
551 
552         access->ac_resp_access = access->ac_req_access;
553         return nfsd_access(rqstp, &cstate->current_fh, &access->ac_resp_access,
554                            &access->ac_supported);
555 }
556 
557 static void gen_boot_verifier(nfs4_verifier *verifier, struct net *net)
558 {
559         __be32 verf[2];
560         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
561 
562         /*
563          * This is opaque to client, so no need to byte-swap. Use
564          * __force to keep sparse happy
565          */
566         verf[0] = (__force __be32)nn->nfssvc_boot.tv_sec;
567         verf[1] = (__force __be32)nn->nfssvc_boot.tv_usec;
568         memcpy(verifier->data, verf, sizeof(verifier->data));
569 }
570 
571 static __be32
572 nfsd4_commit(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
573              struct nfsd4_commit *commit)
574 {
575         gen_boot_verifier(&commit->co_verf, SVC_NET(rqstp));
576         return nfsd_commit(rqstp, &cstate->current_fh, commit->co_offset,
577                              commit->co_count);
578 }
579 
580 static __be32
581 nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
582              struct nfsd4_create *create)
583 {
584         struct svc_fh resfh;
585         __be32 status;
586         dev_t rdev;
587 
588         fh_init(&resfh, NFS4_FHSIZE);
589 
590         status = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_NOP);
591         if (status)
592                 return status;
593 
594         status = check_attr_support(rqstp, cstate, create->cr_bmval,
595                                     nfsd_attrmask);
596         if (status)
597                 return status;
598 
599         switch (create->cr_type) {
600         case NF4LNK:
601                 status = nfsd_symlink(rqstp, &cstate->current_fh,
602                                       create->cr_name, create->cr_namelen,
603                                       create->cr_data, &resfh);
604                 break;
605 
606         case NF4BLK:
607                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
608                 if (MAJOR(rdev) != create->cr_specdata1 ||
609                     MINOR(rdev) != create->cr_specdata2)
610                         return nfserr_inval;
611                 status = nfsd_create(rqstp, &cstate->current_fh,
612                                      create->cr_name, create->cr_namelen,
613                                      &create->cr_iattr, S_IFBLK, rdev, &resfh);
614                 break;
615 
616         case NF4CHR:
617                 rdev = MKDEV(create->cr_specdata1, create->cr_specdata2);
618                 if (MAJOR(rdev) != create->cr_specdata1 ||
619                     MINOR(rdev) != create->cr_specdata2)
620                         return nfserr_inval;
621                 status = nfsd_create(rqstp, &cstate->current_fh,
622                                      create->cr_name, create->cr_namelen,
623                                      &create->cr_iattr,S_IFCHR, rdev, &resfh);
624                 break;
625 
626         case NF4SOCK:
627                 status = nfsd_create(rqstp, &cstate->current_fh,
628                                      create->cr_name, create->cr_namelen,
629                                      &create->cr_iattr, S_IFSOCK, 0, &resfh);
630                 break;
631 
632         case NF4FIFO:
633                 status = nfsd_create(rqstp, &cstate->current_fh,
634                                      create->cr_name, create->cr_namelen,
635                                      &create->cr_iattr, S_IFIFO, 0, &resfh);
636                 break;
637 
638         case NF4DIR:
639                 create->cr_iattr.ia_valid &= ~ATTR_SIZE;
640                 status = nfsd_create(rqstp, &cstate->current_fh,
641                                      create->cr_name, create->cr_namelen,
642                                      &create->cr_iattr, S_IFDIR, 0, &resfh);
643                 break;
644 
645         default:
646                 status = nfserr_badtype;
647         }
648 
649         if (status)
650                 goto out;
651 
652         if (create->cr_label.len)
653                 nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
654 
655         if (create->cr_acl != NULL)
656                 do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
657                                 create->cr_bmval);
658 
659         fh_unlock(&cstate->current_fh);
660         set_change_info(&create->cr_cinfo, &cstate->current_fh);
661         fh_dup2(&cstate->current_fh, &resfh);
662 out:
663         fh_put(&resfh);
664         return status;
665 }
666 
667 static __be32
668 nfsd4_getattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
669               struct nfsd4_getattr *getattr)
670 {
671         __be32 status;
672 
673         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
674         if (status)
675                 return status;
676 
677         if (getattr->ga_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
678                 return nfserr_inval;
679 
680         getattr->ga_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
681         getattr->ga_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
682         getattr->ga_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
683 
684         getattr->ga_fhp = &cstate->current_fh;
685         return nfs_ok;
686 }
687 
688 static __be32
689 nfsd4_link(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
690            struct nfsd4_link *link)
691 {
692         __be32 status = nfserr_nofilehandle;
693 
694         if (!cstate->save_fh.fh_dentry)
695                 return status;
696         status = nfsd_link(rqstp, &cstate->current_fh,
697                            link->li_name, link->li_namelen, &cstate->save_fh);
698         if (!status)
699                 set_change_info(&link->li_cinfo, &cstate->current_fh);
700         return status;
701 }
702 
703 static __be32 nfsd4_do_lookupp(struct svc_rqst *rqstp, struct svc_fh *fh)
704 {
705         struct svc_fh tmp_fh;
706         __be32 ret;
707 
708         fh_init(&tmp_fh, NFS4_FHSIZE);
709         ret = exp_pseudoroot(rqstp, &tmp_fh);
710         if (ret)
711                 return ret;
712         if (tmp_fh.fh_dentry == fh->fh_dentry) {
713                 fh_put(&tmp_fh);
714                 return nfserr_noent;
715         }
716         fh_put(&tmp_fh);
717         return nfsd_lookup(rqstp, fh, "..", 2, fh);
718 }
719 
720 static __be32
721 nfsd4_lookupp(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
722               void *arg)
723 {
724         return nfsd4_do_lookupp(rqstp, &cstate->current_fh);
725 }
726 
727 static __be32
728 nfsd4_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
729              struct nfsd4_lookup *lookup)
730 {
731         return nfsd_lookup(rqstp, &cstate->current_fh,
732                            lookup->lo_name, lookup->lo_len,
733                            &cstate->current_fh);
734 }
735 
736 static __be32
737 nfsd4_read(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
738            struct nfsd4_read *read)
739 {
740         __be32 status;
741 
742         read->rd_filp = NULL;
743         if (read->rd_offset >= OFFSET_MAX)
744                 return nfserr_inval;
745 
746         /*
747          * If we do a zero copy read, then a client will see read data
748          * that reflects the state of the file *after* performing the
749          * following compound.
750          *
751          * To ensure proper ordering, we therefore turn off zero copy if
752          * the client wants us to do more in this compound:
753          */
754         if (!nfsd4_last_compound_op(rqstp))
755                 clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
756 
757         /* check stateid */
758         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
759                                         &read->rd_stateid, RD_STATE,
760                                         &read->rd_filp, &read->rd_tmp_file);
761         if (status) {
762                 dprintk("NFSD: nfsd4_read: couldn't process stateid!\n");
763                 goto out;
764         }
765         status = nfs_ok;
766 out:
767         read->rd_rqstp = rqstp;
768         read->rd_fhp = &cstate->current_fh;
769         return status;
770 }
771 
772 static __be32
773 nfsd4_readdir(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
774               struct nfsd4_readdir *readdir)
775 {
776         u64 cookie = readdir->rd_cookie;
777         static const nfs4_verifier zeroverf;
778 
779         /* no need to check permission - this will be done in nfsd_readdir() */
780 
781         if (readdir->rd_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1)
782                 return nfserr_inval;
783 
784         readdir->rd_bmval[0] &= nfsd_suppattrs[cstate->minorversion][0];
785         readdir->rd_bmval[1] &= nfsd_suppattrs[cstate->minorversion][1];
786         readdir->rd_bmval[2] &= nfsd_suppattrs[cstate->minorversion][2];
787 
788         if ((cookie == 1) || (cookie == 2) ||
789             (cookie == 0 && memcmp(readdir->rd_verf.data, zeroverf.data, NFS4_VERIFIER_SIZE)))
790                 return nfserr_bad_cookie;
791 
792         readdir->rd_rqstp = rqstp;
793         readdir->rd_fhp = &cstate->current_fh;
794         return nfs_ok;
795 }
796 
797 static __be32
798 nfsd4_readlink(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
799                struct nfsd4_readlink *readlink)
800 {
801         readlink->rl_rqstp = rqstp;
802         readlink->rl_fhp = &cstate->current_fh;
803         return nfs_ok;
804 }
805 
806 static __be32
807 nfsd4_remove(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
808              struct nfsd4_remove *remove)
809 {
810         __be32 status;
811 
812         if (opens_in_grace(SVC_NET(rqstp)))
813                 return nfserr_grace;
814         status = nfsd_unlink(rqstp, &cstate->current_fh, 0,
815                              remove->rm_name, remove->rm_namelen);
816         if (!status) {
817                 fh_unlock(&cstate->current_fh);
818                 set_change_info(&remove->rm_cinfo, &cstate->current_fh);
819         }
820         return status;
821 }
822 
823 static __be32
824 nfsd4_rename(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
825              struct nfsd4_rename *rename)
826 {
827         __be32 status = nfserr_nofilehandle;
828 
829         if (!cstate->save_fh.fh_dentry)
830                 return status;
831         if (opens_in_grace(SVC_NET(rqstp)) &&
832                 !(cstate->save_fh.fh_export->ex_flags & NFSEXP_NOSUBTREECHECK))
833                 return nfserr_grace;
834         status = nfsd_rename(rqstp, &cstate->save_fh, rename->rn_sname,
835                              rename->rn_snamelen, &cstate->current_fh,
836                              rename->rn_tname, rename->rn_tnamelen);
837         if (status)
838                 return status;
839         set_change_info(&rename->rn_sinfo, &cstate->current_fh);
840         set_change_info(&rename->rn_tinfo, &cstate->save_fh);
841         return nfs_ok;
842 }
843 
844 static __be32
845 nfsd4_secinfo(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
846               struct nfsd4_secinfo *secinfo)
847 {
848         struct svc_export *exp;
849         struct dentry *dentry;
850         __be32 err;
851 
852         err = fh_verify(rqstp, &cstate->current_fh, S_IFDIR, NFSD_MAY_EXEC);
853         if (err)
854                 return err;
855         err = nfsd_lookup_dentry(rqstp, &cstate->current_fh,
856                                     secinfo->si_name, secinfo->si_namelen,
857                                     &exp, &dentry);
858         if (err)
859                 return err;
860         fh_unlock(&cstate->current_fh);
861         if (d_really_is_negative(dentry)) {
862                 exp_put(exp);
863                 err = nfserr_noent;
864         } else
865                 secinfo->si_exp = exp;
866         dput(dentry);
867         if (cstate->minorversion)
868                 /* See rfc 5661 section 2.6.3.1.1.8 */
869                 fh_put(&cstate->current_fh);
870         return err;
871 }
872 
873 static __be32
874 nfsd4_secinfo_no_name(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
875               struct nfsd4_secinfo_no_name *sin)
876 {
877         __be32 err;
878 
879         switch (sin->sin_style) {
880         case NFS4_SECINFO_STYLE4_CURRENT_FH:
881                 break;
882         case NFS4_SECINFO_STYLE4_PARENT:
883                 err = nfsd4_do_lookupp(rqstp, &cstate->current_fh);
884                 if (err)
885                         return err;
886                 break;
887         default:
888                 return nfserr_inval;
889         }
890 
891         sin->sin_exp = exp_get(cstate->current_fh.fh_export);
892         fh_put(&cstate->current_fh);
893         return nfs_ok;
894 }
895 
896 static __be32
897 nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
898               struct nfsd4_setattr *setattr)
899 {
900         __be32 status = nfs_ok;
901         int err;
902 
903         if (setattr->sa_iattr.ia_valid & ATTR_SIZE) {
904                 status = nfs4_preprocess_stateid_op(rqstp, cstate,
905                                 &cstate->current_fh, &setattr->sa_stateid,
906                                 WR_STATE, NULL, NULL);
907                 if (status) {
908                         dprintk("NFSD: nfsd4_setattr: couldn't process stateid!\n");
909                         return status;
910                 }
911         }
912         err = fh_want_write(&cstate->current_fh);
913         if (err)
914                 return nfserrno(err);
915         status = nfs_ok;
916 
917         status = check_attr_support(rqstp, cstate, setattr->sa_bmval,
918                                     nfsd_attrmask);
919         if (status)
920                 goto out;
921 
922         if (setattr->sa_acl != NULL)
923                 status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
924                                             setattr->sa_acl);
925         if (status)
926                 goto out;
927         if (setattr->sa_label.len)
928                 status = nfsd4_set_nfs4_label(rqstp, &cstate->current_fh,
929                                 &setattr->sa_label);
930         if (status)
931                 goto out;
932         status = nfsd_setattr(rqstp, &cstate->current_fh, &setattr->sa_iattr,
933                                 0, (time_t)0);
934 out:
935         fh_drop_write(&cstate->current_fh);
936         return status;
937 }
938 
939 static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write)
940 {
941         int i = 1;
942         int buflen = write->wr_buflen;
943 
944         vec[0].iov_base = write->wr_head.iov_base;
945         vec[0].iov_len = min_t(int, buflen, write->wr_head.iov_len);
946         buflen -= vec[0].iov_len;
947 
948         while (buflen) {
949                 vec[i].iov_base = page_address(write->wr_pagelist[i - 1]);
950                 vec[i].iov_len = min_t(int, PAGE_SIZE, buflen);
951                 buflen -= vec[i].iov_len;
952                 i++;
953         }
954         return i;
955 }
956 
957 static __be32
958 nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
959             struct nfsd4_write *write)
960 {
961         stateid_t *stateid = &write->wr_stateid;
962         struct file *filp = NULL;
963         __be32 status = nfs_ok;
964         unsigned long cnt;
965         int nvecs;
966 
967         if (write->wr_offset >= OFFSET_MAX)
968                 return nfserr_inval;
969 
970         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
971                                                 stateid, WR_STATE, &filp, NULL);
972         if (status) {
973                 dprintk("NFSD: nfsd4_write: couldn't process stateid!\n");
974                 return status;
975         }
976 
977         cnt = write->wr_buflen;
978         write->wr_how_written = write->wr_stable_how;
979         gen_boot_verifier(&write->wr_verifier, SVC_NET(rqstp));
980 
981         nvecs = fill_in_write_vector(rqstp->rq_vec, write);
982         WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
983 
984         status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
985                                 write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
986                                 &write->wr_how_written);
987         fput(filp);
988 
989         write->wr_bytes_written = cnt;
990 
991         return status;
992 }
993 
994 static __be32
995 nfsd4_verify_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
996                   stateid_t *src_stateid, struct file **src,
997                   stateid_t *dst_stateid, struct file **dst)
998 {
999         __be32 status;
1000 
1001         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->save_fh,
1002                                             src_stateid, RD_STATE, src, NULL);
1003         if (status) {
1004                 dprintk("NFSD: %s: couldn't process src stateid!\n", __func__);
1005                 goto out;
1006         }
1007 
1008         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1009                                             dst_stateid, WR_STATE, dst, NULL);
1010         if (status) {
1011                 dprintk("NFSD: %s: couldn't process dst stateid!\n", __func__);
1012                 goto out_put_src;
1013         }
1014 
1015         /* fix up for NFS-specific error code */
1016         if (!S_ISREG(file_inode(*src)->i_mode) ||
1017             !S_ISREG(file_inode(*dst)->i_mode)) {
1018                 status = nfserr_wrong_type;
1019                 goto out_put_dst;
1020         }
1021 
1022 out:
1023         return status;
1024 out_put_dst:
1025         fput(*dst);
1026 out_put_src:
1027         fput(*src);
1028         goto out;
1029 }
1030 
1031 static __be32
1032 nfsd4_clone(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1033                 struct nfsd4_clone *clone)
1034 {
1035         struct file *src, *dst;
1036         __be32 status;
1037 
1038         status = nfsd4_verify_copy(rqstp, cstate, &clone->cl_src_stateid, &src,
1039                                    &clone->cl_dst_stateid, &dst);
1040         if (status)
1041                 goto out;
1042 
1043         status = nfsd4_clone_file_range(src, clone->cl_src_pos,
1044                         dst, clone->cl_dst_pos, clone->cl_count);
1045 
1046         fput(dst);
1047         fput(src);
1048 out:
1049         return status;
1050 }
1051 
1052 static __be32
1053 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1054                 struct nfsd4_copy *copy)
1055 {
1056         struct file *src, *dst;
1057         __be32 status;
1058         ssize_t bytes;
1059 
1060         status = nfsd4_verify_copy(rqstp, cstate, &copy->cp_src_stateid, &src,
1061                                    &copy->cp_dst_stateid, &dst);
1062         if (status)
1063                 goto out;
1064 
1065         bytes = nfsd_copy_file_range(src, copy->cp_src_pos,
1066                         dst, copy->cp_dst_pos, copy->cp_count);
1067 
1068         if (bytes < 0)
1069                 status = nfserrno(bytes);
1070         else {
1071                 copy->cp_res.wr_bytes_written = bytes;
1072                 copy->cp_res.wr_stable_how = NFS_UNSTABLE;
1073                 copy->cp_consecutive = 1;
1074                 copy->cp_synchronous = 1;
1075                 gen_boot_verifier(&copy->cp_res.wr_verifier, SVC_NET(rqstp));
1076                 status = nfs_ok;
1077         }
1078 
1079         fput(src);
1080         fput(dst);
1081 out:
1082         return status;
1083 }
1084 
1085 static __be32
1086 nfsd4_fallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1087                 struct nfsd4_fallocate *fallocate, int flags)
1088 {
1089         __be32 status = nfserr_notsupp;
1090         struct file *file;
1091 
1092         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1093                                             &fallocate->falloc_stateid,
1094                                             WR_STATE, &file, NULL);
1095         if (status != nfs_ok) {
1096                 dprintk("NFSD: nfsd4_fallocate: couldn't process stateid!\n");
1097                 return status;
1098         }
1099 
1100         status = nfsd4_vfs_fallocate(rqstp, &cstate->current_fh, file,
1101                                      fallocate->falloc_offset,
1102                                      fallocate->falloc_length,
1103                                      flags);
1104         fput(file);
1105         return status;
1106 }
1107 
1108 static __be32
1109 nfsd4_allocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1110                struct nfsd4_fallocate *fallocate)
1111 {
1112         return nfsd4_fallocate(rqstp, cstate, fallocate, 0);
1113 }
1114 
1115 static __be32
1116 nfsd4_deallocate(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1117                  struct nfsd4_fallocate *fallocate)
1118 {
1119         return nfsd4_fallocate(rqstp, cstate, fallocate,
1120                                FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE);
1121 }
1122 
1123 static __be32
1124 nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1125                 struct nfsd4_seek *seek)
1126 {
1127         int whence;
1128         __be32 status;
1129         struct file *file;
1130 
1131         status = nfs4_preprocess_stateid_op(rqstp, cstate, &cstate->current_fh,
1132                                             &seek->seek_stateid,
1133                                             RD_STATE, &file, NULL);
1134         if (status) {
1135                 dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
1136                 return status;
1137         }
1138 
1139         switch (seek->seek_whence) {
1140         case NFS4_CONTENT_DATA:
1141                 whence = SEEK_DATA;
1142                 break;
1143         case NFS4_CONTENT_HOLE:
1144                 whence = SEEK_HOLE;
1145                 break;
1146         default:
1147                 status = nfserr_union_notsupp;
1148                 goto out;
1149         }
1150 
1151         /*
1152          * Note:  This call does change file->f_pos, but nothing in NFSD
1153          *        should ever file->f_pos.
1154          */
1155         seek->seek_pos = vfs_llseek(file, seek->seek_offset, whence);
1156         if (seek->seek_pos < 0)
1157                 status = nfserrno(seek->seek_pos);
1158         else if (seek->seek_pos >= i_size_read(file_inode(file)))
1159                 seek->seek_eof = true;
1160 
1161 out:
1162         fput(file);
1163         return status;
1164 }
1165 
1166 /* This routine never returns NFS_OK!  If there are no other errors, it
1167  * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the
1168  * attributes matched.  VERIFY is implemented by mapping NFSERR_SAME
1169  * to NFS_OK after the call; NVERIFY by mapping NFSERR_NOT_SAME to NFS_OK.
1170  */
1171 static __be32
1172 _nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1173              struct nfsd4_verify *verify)
1174 {
1175         __be32 *buf, *p;
1176         int count;
1177         __be32 status;
1178 
1179         status = fh_verify(rqstp, &cstate->current_fh, 0, NFSD_MAY_NOP);
1180         if (status)
1181                 return status;
1182 
1183         status = check_attr_support(rqstp, cstate, verify->ve_bmval, NULL);
1184         if (status)
1185                 return status;
1186 
1187         if ((verify->ve_bmval[0] & FATTR4_WORD0_RDATTR_ERROR)
1188             || (verify->ve_bmval[1] & NFSD_WRITEONLY_ATTRS_WORD1))
1189                 return nfserr_inval;
1190         if (verify->ve_attrlen & 3)
1191                 return nfserr_inval;
1192 
1193         /* count in words:
1194          *   bitmap_len(1) + bitmap(2) + attr_len(1) = 4
1195          */
1196         count = 4 + (verify->ve_attrlen >> 2);
1197         buf = kmalloc(count << 2, GFP_KERNEL);
1198         if (!buf)
1199                 return nfserr_jukebox;
1200 
1201         p = buf;
1202         status = nfsd4_encode_fattr_to_buf(&p, count, &cstate->current_fh,
1203                                     cstate->current_fh.fh_export,
1204                                     cstate->current_fh.fh_dentry,
1205                                     verify->ve_bmval,
1206                                     rqstp, 0);
1207         /*
1208          * If nfsd4_encode_fattr() ran out of space, assume that's because
1209          * the attributes are longer (hence different) than those given:
1210          */
1211         if (status == nfserr_resource)
1212                 status = nfserr_not_same;
1213         if (status)
1214                 goto out_kfree;
1215 
1216         /* skip bitmap */
1217         p = buf + 1 + ntohl(buf[0]);
1218         status = nfserr_not_same;
1219         if (ntohl(*p++) != verify->ve_attrlen)
1220                 goto out_kfree;
1221         if (!memcmp(p, verify->ve_attrval, verify->ve_attrlen))
1222                 status = nfserr_same;
1223 
1224 out_kfree:
1225         kfree(buf);
1226         return status;
1227 }
1228 
1229 static __be32
1230 nfsd4_nverify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1231               struct nfsd4_verify *verify)
1232 {
1233         __be32 status;
1234 
1235         status = _nfsd4_verify(rqstp, cstate, verify);
1236         return status == nfserr_not_same ? nfs_ok : status;
1237 }
1238 
1239 static __be32
1240 nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1241              struct nfsd4_verify *verify)
1242 {
1243         __be32 status;
1244 
1245         status = _nfsd4_verify(rqstp, cstate, verify);
1246         return status == nfserr_same ? nfs_ok : status;
1247 }
1248 
1249 #ifdef CONFIG_NFSD_PNFS
1250 static const struct nfsd4_layout_ops *
1251 nfsd4_layout_verify(struct svc_export *exp, unsigned int layout_type)
1252 {
1253         if (!exp->ex_layout_types) {
1254                 dprintk("%s: export does not support pNFS\n", __func__);
1255                 return NULL;
1256         }
1257 
1258         if (!(exp->ex_layout_types & (1 << layout_type))) {
1259                 dprintk("%s: layout type %d not supported\n",
1260                         __func__, layout_type);
1261                 return NULL;
1262         }
1263 
1264         return nfsd4_layout_ops[layout_type];
1265 }
1266 
1267 static __be32
1268 nfsd4_getdeviceinfo(struct svc_rqst *rqstp,
1269                 struct nfsd4_compound_state *cstate,
1270                 struct nfsd4_getdeviceinfo *gdp)
1271 {
1272         const struct nfsd4_layout_ops *ops;
1273         struct nfsd4_deviceid_map *map;
1274         struct svc_export *exp;
1275         __be32 nfserr;
1276 
1277         dprintk("%s: layout_type %u dev_id [0x%llx:0x%x] maxcnt %u\n",
1278                __func__,
1279                gdp->gd_layout_type,
1280                gdp->gd_devid.fsid_idx, gdp->gd_devid.generation,
1281                gdp->gd_maxcount);
1282 
1283         map = nfsd4_find_devid_map(gdp->gd_devid.fsid_idx);
1284         if (!map) {
1285                 dprintk("%s: couldn't find device ID to export mapping!\n",
1286                         __func__);
1287                 return nfserr_noent;
1288         }
1289 
1290         exp = rqst_exp_find(rqstp, map->fsid_type, map->fsid);
1291         if (IS_ERR(exp)) {
1292                 dprintk("%s: could not find device id\n", __func__);
1293                 return nfserr_noent;
1294         }
1295 
1296         nfserr = nfserr_layoutunavailable;
1297         ops = nfsd4_layout_verify(exp, gdp->gd_layout_type);
1298         if (!ops)
1299                 goto out;
1300 
1301         nfserr = nfs_ok;
1302         if (gdp->gd_maxcount != 0) {
1303                 nfserr = ops->proc_getdeviceinfo(exp->ex_path.mnt->mnt_sb,
1304                                 rqstp, cstate->session->se_client, gdp);
1305         }
1306 
1307         gdp->gd_notify_types &= ops->notify_types;
1308 out:
1309         exp_put(exp);
1310         return nfserr;
1311 }
1312 
1313 static __be32
1314 nfsd4_layoutget(struct svc_rqst *rqstp,
1315                 struct nfsd4_compound_state *cstate,
1316                 struct nfsd4_layoutget *lgp)
1317 {
1318         struct svc_fh *current_fh = &cstate->current_fh;
1319         const struct nfsd4_layout_ops *ops;
1320         struct nfs4_layout_stateid *ls;
1321         __be32 nfserr;
1322         int accmode;
1323 
1324         switch (lgp->lg_seg.iomode) {
1325         case IOMODE_READ:
1326                 accmode = NFSD_MAY_READ;
1327                 break;
1328         case IOMODE_RW:
1329                 accmode = NFSD_MAY_READ | NFSD_MAY_WRITE;
1330                 break;
1331         default:
1332                 dprintk("%s: invalid iomode %d\n",
1333                         __func__, lgp->lg_seg.iomode);
1334                 nfserr = nfserr_badiomode;
1335                 goto out;
1336         }
1337 
1338         nfserr = fh_verify(rqstp, current_fh, 0, accmode);
1339         if (nfserr)
1340                 goto out;
1341 
1342         nfserr = nfserr_layoutunavailable;
1343         ops = nfsd4_layout_verify(current_fh->fh_export, lgp->lg_layout_type);
1344         if (!ops)
1345                 goto out;
1346 
1347         /*
1348          * Verify minlength and range as per RFC5661:
1349          *  o  If loga_length is less than loga_minlength,
1350          *     the metadata server MUST return NFS4ERR_INVAL.
1351          *  o  If the sum of loga_offset and loga_minlength exceeds
1352          *     NFS4_UINT64_MAX, and loga_minlength is not
1353          *     NFS4_UINT64_MAX, the error NFS4ERR_INVAL MUST result.
1354          *  o  If the sum of loga_offset and loga_length exceeds
1355          *     NFS4_UINT64_MAX, and loga_length is not NFS4_UINT64_MAX,
1356          *     the error NFS4ERR_INVAL MUST result.
1357          */
1358         nfserr = nfserr_inval;
1359         if (lgp->lg_seg.length < lgp->lg_minlength ||
1360             (lgp->lg_minlength != NFS4_MAX_UINT64 &&
1361              lgp->lg_minlength > NFS4_MAX_UINT64 - lgp->lg_seg.offset) ||
1362             (lgp->lg_seg.length != NFS4_MAX_UINT64 &&
1363              lgp->lg_seg.length > NFS4_MAX_UINT64 - lgp->lg_seg.offset))
1364                 goto out;
1365         if (lgp->lg_seg.length == 0)
1366                 goto out;
1367 
1368         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lgp->lg_sid,
1369                                                 true, lgp->lg_layout_type, &ls);
1370         if (nfserr) {
1371                 trace_layout_get_lookup_fail(&lgp->lg_sid);
1372                 goto out;
1373         }
1374 
1375         nfserr = nfserr_recallconflict;
1376         if (atomic_read(&ls->ls_stid.sc_file->fi_lo_recalls))
1377                 goto out_put_stid;
1378 
1379         nfserr = ops->proc_layoutget(d_inode(current_fh->fh_dentry),
1380                                      current_fh, lgp);
1381         if (nfserr)
1382                 goto out_put_stid;
1383 
1384         nfserr = nfsd4_insert_layout(lgp, ls);
1385 
1386 out_put_stid:
1387         mutex_unlock(&ls->ls_mutex);
1388         nfs4_put_stid(&ls->ls_stid);
1389 out:
1390         return nfserr;
1391 }
1392 
1393 static __be32
1394 nfsd4_layoutcommit(struct svc_rqst *rqstp,
1395                 struct nfsd4_compound_state *cstate,
1396                 struct nfsd4_layoutcommit *lcp)
1397 {
1398         const struct nfsd4_layout_seg *seg = &lcp->lc_seg;
1399         struct svc_fh *current_fh = &cstate->current_fh;
1400         const struct nfsd4_layout_ops *ops;
1401         loff_t new_size = lcp->lc_last_wr + 1;
1402         struct inode *inode;
1403         struct nfs4_layout_stateid *ls;
1404         __be32 nfserr;
1405 
1406         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_WRITE);
1407         if (nfserr)
1408                 goto out;
1409 
1410         nfserr = nfserr_layoutunavailable;
1411         ops = nfsd4_layout_verify(current_fh->fh_export, lcp->lc_layout_type);
1412         if (!ops)
1413                 goto out;
1414         inode = d_inode(current_fh->fh_dentry);
1415 
1416         nfserr = nfserr_inval;
1417         if (new_size <= seg->offset) {
1418                 dprintk("pnfsd: last write before layout segment\n");
1419                 goto out;
1420         }
1421         if (new_size > seg->offset + seg->length) {
1422                 dprintk("pnfsd: last write beyond layout segment\n");
1423                 goto out;
1424         }
1425         if (!lcp->lc_newoffset && new_size > i_size_read(inode)) {
1426                 dprintk("pnfsd: layoutcommit beyond EOF\n");
1427                 goto out;
1428         }
1429 
1430         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lcp->lc_sid,
1431                                                 false, lcp->lc_layout_type,
1432                                                 &ls);
1433         if (nfserr) {
1434                 trace_layout_commit_lookup_fail(&lcp->lc_sid);
1435                 /* fixup error code as per RFC5661 */
1436                 if (nfserr == nfserr_bad_stateid)
1437                         nfserr = nfserr_badlayout;
1438                 goto out;
1439         }
1440 
1441         /* LAYOUTCOMMIT does not require any serialization */
1442         mutex_unlock(&ls->ls_mutex);
1443 
1444         if (new_size > i_size_read(inode)) {
1445                 lcp->lc_size_chg = 1;
1446                 lcp->lc_newsize = new_size;
1447         } else {
1448                 lcp->lc_size_chg = 0;
1449         }
1450 
1451         nfserr = ops->proc_layoutcommit(inode, lcp);
1452         nfs4_put_stid(&ls->ls_stid);
1453 out:
1454         return nfserr;
1455 }
1456 
1457 static __be32
1458 nfsd4_layoutreturn(struct svc_rqst *rqstp,
1459                 struct nfsd4_compound_state *cstate,
1460                 struct nfsd4_layoutreturn *lrp)
1461 {
1462         struct svc_fh *current_fh = &cstate->current_fh;
1463         __be32 nfserr;
1464 
1465         nfserr = fh_verify(rqstp, current_fh, 0, NFSD_MAY_NOP);
1466         if (nfserr)
1467                 goto out;
1468 
1469         nfserr = nfserr_layoutunavailable;
1470         if (!nfsd4_layout_verify(current_fh->fh_export, lrp->lr_layout_type))
1471                 goto out;
1472 
1473         switch (lrp->lr_seg.iomode) {
1474         case IOMODE_READ:
1475         case IOMODE_RW:
1476         case IOMODE_ANY:
1477                 break;
1478         default:
1479                 dprintk("%s: invalid iomode %d\n", __func__,
1480                         lrp->lr_seg.iomode);
1481                 nfserr = nfserr_inval;
1482                 goto out;
1483         }
1484 
1485         switch (lrp->lr_return_type) {
1486         case RETURN_FILE:
1487                 nfserr = nfsd4_return_file_layouts(rqstp, cstate, lrp);
1488                 break;
1489         case RETURN_FSID:
1490         case RETURN_ALL:
1491                 nfserr = nfsd4_return_client_layouts(rqstp, cstate, lrp);
1492                 break;
1493         default:
1494                 dprintk("%s: invalid return_type %d\n", __func__,
1495                         lrp->lr_return_type);
1496                 nfserr = nfserr_inval;
1497                 break;
1498         }
1499 out:
1500         return nfserr;
1501 }
1502 #endif /* CONFIG_NFSD_PNFS */
1503 
1504 /*
1505  * NULL call.
1506  */
1507 static __be32
1508 nfsd4_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
1509 {
1510         return nfs_ok;
1511 }
1512 
1513 static inline void nfsd4_increment_op_stats(u32 opnum)
1514 {
1515         if (opnum >= FIRST_NFS4_OP && opnum <= LAST_NFS4_OP)
1516                 nfsdstats.nfs4_opcount[opnum]++;
1517 }
1518 
1519 typedef __be32(*nfsd4op_func)(struct svc_rqst *, struct nfsd4_compound_state *,
1520                               void *);
1521 typedef u32(*nfsd4op_rsize)(struct svc_rqst *, struct nfsd4_op *op);
1522 typedef void(*stateid_setter)(struct nfsd4_compound_state *, void *);
1523 typedef void(*stateid_getter)(struct nfsd4_compound_state *, void *);
1524 
1525 enum nfsd4_op_flags {
1526         ALLOWED_WITHOUT_FH = 1 << 0,    /* No current filehandle required */
1527         ALLOWED_ON_ABSENT_FS = 1 << 1,  /* ops processed on absent fs */
1528         ALLOWED_AS_FIRST_OP = 1 << 2,   /* ops reqired first in compound */
1529         /* For rfc 5661 section 2.6.3.1.1: */
1530         OP_HANDLES_WRONGSEC = 1 << 3,
1531         OP_IS_PUTFH_LIKE = 1 << 4,
1532         /*
1533          * These are the ops whose result size we estimate before
1534          * encoding, to avoid performing an op then not being able to
1535          * respond or cache a response.  This includes writes and setattrs
1536          * as well as the operations usually called "nonidempotent":
1537          */
1538         OP_MODIFIES_SOMETHING = 1 << 5,
1539         /*
1540          * Cache compounds containing these ops in the xid-based drc:
1541          * We use the DRC for compounds containing non-idempotent
1542          * operations, *except* those that are 4.1-specific (since
1543          * sessions provide their own EOS), and except for stateful
1544          * operations other than setclientid and setclientid_confirm
1545          * (since sequence numbers provide EOS for open, lock, etc in
1546          * the v4.0 case).
1547          */
1548         OP_CACHEME = 1 << 6,
1549         /*
1550          * These are ops which clear current state id.
1551          */
1552         OP_CLEAR_STATEID = 1 << 7,
1553 };
1554 
1555 struct nfsd4_operation {
1556         nfsd4op_func op_func;
1557         u32 op_flags;
1558         char *op_name;
1559         /* Try to get response size before operation */
1560         nfsd4op_rsize op_rsize_bop;
1561         stateid_getter op_get_currentstateid;
1562         stateid_setter op_set_currentstateid;
1563 };
1564 
1565 static struct nfsd4_operation nfsd4_ops[];
1566 
1567 static const char *nfsd4_op_name(unsigned opnum);
1568 
1569 /*
1570  * Enforce NFSv4.1 COMPOUND ordering rules:
1571  *
1572  * Also note, enforced elsewhere:
1573  *      - SEQUENCE other than as first op results in
1574  *        NFS4ERR_SEQUENCE_POS. (Enforced in nfsd4_sequence().)
1575  *      - BIND_CONN_TO_SESSION must be the only op in its compound.
1576  *        (Enforced in nfsd4_bind_conn_to_session().)
1577  *      - DESTROY_SESSION must be the final operation in a compound, if
1578  *        sessionid's in SEQUENCE and DESTROY_SESSION are the same.
1579  *        (Enforced in nfsd4_destroy_session().)
1580  */
1581 static __be32 nfs41_check_op_ordering(struct nfsd4_compoundargs *args)
1582 {
1583         struct nfsd4_op *op = &args->ops[0];
1584 
1585         /* These ordering requirements don't apply to NFSv4.0: */
1586         if (args->minorversion == 0)
1587                 return nfs_ok;
1588         /* This is weird, but OK, not our problem: */
1589         if (args->opcnt == 0)
1590                 return nfs_ok;
1591         if (op->status == nfserr_op_illegal)
1592                 return nfs_ok;
1593         if (!(nfsd4_ops[op->opnum].op_flags & ALLOWED_AS_FIRST_OP))
1594                 return nfserr_op_not_in_session;
1595         if (op->opnum == OP_SEQUENCE)
1596                 return nfs_ok;
1597         if (args->opcnt != 1)
1598                 return nfserr_not_only_op;
1599         return nfs_ok;
1600 }
1601 
1602 static inline struct nfsd4_operation *OPDESC(struct nfsd4_op *op)
1603 {
1604         return &nfsd4_ops[op->opnum];
1605 }
1606 
1607 bool nfsd4_cache_this_op(struct nfsd4_op *op)
1608 {
1609         if (op->opnum == OP_ILLEGAL)
1610                 return false;
1611         return OPDESC(op)->op_flags & OP_CACHEME;
1612 }
1613 
1614 static bool need_wrongsec_check(struct svc_rqst *rqstp)
1615 {
1616         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1617         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1618         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
1619         struct nfsd4_op *next = &argp->ops[resp->opcnt];
1620         struct nfsd4_operation *thisd;
1621         struct nfsd4_operation *nextd;
1622 
1623         thisd = OPDESC(this);
1624         /*
1625          * Most ops check wronsec on our own; only the putfh-like ops
1626          * have special rules.
1627          */
1628         if (!(thisd->op_flags & OP_IS_PUTFH_LIKE))
1629                 return false;
1630         /*
1631          * rfc 5661 2.6.3.1.1.6: don't bother erroring out a
1632          * put-filehandle operation if we're not going to use the
1633          * result:
1634          */
1635         if (argp->opcnt == resp->opcnt)
1636                 return false;
1637         if (next->opnum == OP_ILLEGAL)
1638                 return false;
1639         nextd = OPDESC(next);
1640         /*
1641          * Rest of 2.6.3.1.1: certain operations will return WRONGSEC
1642          * errors themselves as necessary; others should check for them
1643          * now:
1644          */
1645         return !(nextd->op_flags & OP_HANDLES_WRONGSEC);
1646 }
1647 
1648 static void svcxdr_init_encode(struct svc_rqst *rqstp,
1649                                struct nfsd4_compoundres *resp)
1650 {
1651         struct xdr_stream *xdr = &resp->xdr;
1652         struct xdr_buf *buf = &rqstp->rq_res;
1653         struct kvec *head = buf->head;
1654 
1655         xdr->buf = buf;
1656         xdr->iov = head;
1657         xdr->p   = head->iov_base + head->iov_len;
1658         xdr->end = head->iov_base + PAGE_SIZE - rqstp->rq_auth_slack;
1659         /* Tail and page_len should be zero at this point: */
1660         buf->len = buf->head[0].iov_len;
1661         xdr->scratch.iov_len = 0;
1662         xdr->page_ptr = buf->pages - 1;
1663         buf->buflen = PAGE_SIZE * (1 + rqstp->rq_page_end - buf->pages)
1664                 - rqstp->rq_auth_slack;
1665 }
1666 
1667 /*
1668  * COMPOUND call.
1669  */
1670 static __be32
1671 nfsd4_proc_compound(struct svc_rqst *rqstp,
1672                     struct nfsd4_compoundargs *args,
1673                     struct nfsd4_compoundres *resp)
1674 {
1675         struct nfsd4_op *op;
1676         struct nfsd4_operation *opdesc;
1677         struct nfsd4_compound_state *cstate = &resp->cstate;
1678         struct svc_fh *current_fh = &cstate->current_fh;
1679         struct svc_fh *save_fh = &cstate->save_fh;
1680         __be32          status;
1681 
1682         svcxdr_init_encode(rqstp, resp);
1683         resp->tagp = resp->xdr.p;
1684         /* reserve space for: taglen, tag, and opcnt */
1685         xdr_reserve_space(&resp->xdr, 8 + args->taglen);
1686         resp->taglen = args->taglen;
1687         resp->tag = args->tag;
1688         resp->rqstp = rqstp;
1689         cstate->minorversion = args->minorversion;
1690         fh_init(current_fh, NFS4_FHSIZE);
1691         fh_init(save_fh, NFS4_FHSIZE);
1692         /*
1693          * Don't use the deferral mechanism for NFSv4; compounds make it
1694          * too hard to avoid non-idempotency problems.
1695          */
1696         clear_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1697 
1698         /*
1699          * According to RFC3010, this takes precedence over all other errors.
1700          */
1701         status = nfserr_minor_vers_mismatch;
1702         if (nfsd_minorversion(args->minorversion, NFSD_TEST) <= 0)
1703                 goto out;
1704 
1705         status = nfs41_check_op_ordering(args);
1706         if (status) {
1707                 op = &args->ops[0];
1708                 op->status = status;
1709                 goto encode_op;
1710         }
1711 
1712         while (!status && resp->opcnt < args->opcnt) {
1713                 op = &args->ops[resp->opcnt++];
1714 
1715                 dprintk("nfsv4 compound op #%d/%d: %d (%s)\n",
1716                         resp->opcnt, args->opcnt, op->opnum,
1717                         nfsd4_op_name(op->opnum));
1718                 /*
1719                  * The XDR decode routines may have pre-set op->status;
1720                  * for example, if there is a miscellaneous XDR error
1721                  * it will be set to nfserr_bad_xdr.
1722                  */
1723                 if (op->status) {
1724                         if (op->opnum == OP_OPEN)
1725                                 op->status = nfsd4_open_omfg(rqstp, cstate, op);
1726                         goto encode_op;
1727                 }
1728 
1729                 opdesc = OPDESC(op);
1730 
1731                 if (!current_fh->fh_dentry) {
1732                         if (!(opdesc->op_flags & ALLOWED_WITHOUT_FH)) {
1733                                 op->status = nfserr_nofilehandle;
1734                                 goto encode_op;
1735                         }
1736                 } else if (current_fh->fh_export->ex_fslocs.migrated &&
1737                           !(opdesc->op_flags & ALLOWED_ON_ABSENT_FS)) {
1738                         op->status = nfserr_moved;
1739                         goto encode_op;
1740                 }
1741 
1742                 fh_clear_wcc(current_fh);
1743 
1744                 /* If op is non-idempotent */
1745                 if (opdesc->op_flags & OP_MODIFIES_SOMETHING) {
1746                         /*
1747                          * Don't execute this op if we couldn't encode a
1748                          * succesful reply:
1749                          */
1750                         u32 plen = opdesc->op_rsize_bop(rqstp, op);
1751                         /*
1752                          * Plus if there's another operation, make sure
1753                          * we'll have space to at least encode an error:
1754                          */
1755                         if (resp->opcnt < args->opcnt)
1756                                 plen += COMPOUND_ERR_SLACK_SPACE;
1757                         op->status = nfsd4_check_resp_size(resp, plen);
1758                 }
1759 
1760                 if (op->status)
1761                         goto encode_op;
1762 
1763                 if (opdesc->op_get_currentstateid)
1764                         opdesc->op_get_currentstateid(cstate, &op->u);
1765                 op->status = opdesc->op_func(rqstp, cstate, &op->u);
1766 
1767                 if (!op->status) {
1768                         if (opdesc->op_set_currentstateid)
1769                                 opdesc->op_set_currentstateid(cstate, &op->u);
1770 
1771                         if (opdesc->op_flags & OP_CLEAR_STATEID)
1772                                 clear_current_stateid(cstate);
1773 
1774                         if (need_wrongsec_check(rqstp))
1775                                 op->status = check_nfsd_access(current_fh->fh_export, rqstp);
1776                 }
1777 
1778 encode_op:
1779                 /* Only from SEQUENCE */
1780                 if (cstate->status == nfserr_replay_cache) {
1781                         dprintk("%s NFS4.1 replay from cache\n", __func__);
1782                         status = op->status;
1783                         goto out;
1784                 }
1785                 if (op->status == nfserr_replay_me) {
1786                         op->replay = &cstate->replay_owner->so_replay;
1787                         nfsd4_encode_replay(&resp->xdr, op);
1788                         status = op->status = op->replay->rp_status;
1789                 } else {
1790                         nfsd4_encode_operation(resp, op);
1791                         status = op->status;
1792                 }
1793 
1794                 dprintk("nfsv4 compound op %p opcnt %d #%d: %d: status %d\n",
1795                         args->ops, args->opcnt, resp->opcnt, op->opnum,
1796                         be32_to_cpu(status));
1797 
1798                 nfsd4_cstate_clear_replay(cstate);
1799                 nfsd4_increment_op_stats(op->opnum);
1800         }
1801 
1802         cstate->status = status;
1803         fh_put(current_fh);
1804         fh_put(save_fh);
1805         BUG_ON(cstate->replay_owner);
1806 out:
1807         /* Reset deferral mechanism for RPC deferrals */
1808         set_bit(RQ_USEDEFERRAL, &rqstp->rq_flags);
1809         dprintk("nfsv4 compound returned %d\n", ntohl(status));
1810         return status;
1811 }
1812 
1813 #define op_encode_hdr_size              (2)
1814 #define op_encode_stateid_maxsz         (XDR_QUADLEN(NFS4_STATEID_SIZE))
1815 #define op_encode_verifier_maxsz        (XDR_QUADLEN(NFS4_VERIFIER_SIZE))
1816 #define op_encode_change_info_maxsz     (5)
1817 #define nfs4_fattr_bitmap_maxsz         (4)
1818 
1819 /* We'll fall back on returning no lockowner if run out of space: */
1820 #define op_encode_lockowner_maxsz       (0)
1821 #define op_encode_lock_denied_maxsz     (8 + op_encode_lockowner_maxsz)
1822 
1823 #define nfs4_owner_maxsz                (1 + XDR_QUADLEN(IDMAP_NAMESZ))
1824 
1825 #define op_encode_ace_maxsz             (3 + nfs4_owner_maxsz)
1826 #define op_encode_delegation_maxsz      (1 + op_encode_stateid_maxsz + 1 + \
1827                                          op_encode_ace_maxsz)
1828 
1829 #define op_encode_channel_attrs_maxsz   (6 + 1 + 1)
1830 
1831 static inline u32 nfsd4_only_status_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1832 {
1833         return (op_encode_hdr_size) * sizeof(__be32);
1834 }
1835 
1836 static inline u32 nfsd4_status_stateid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1837 {
1838         return (op_encode_hdr_size + op_encode_stateid_maxsz)* sizeof(__be32);
1839 }
1840 
1841 static inline u32 nfsd4_commit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1842 {
1843         return (op_encode_hdr_size + op_encode_verifier_maxsz) * sizeof(__be32);
1844 }
1845 
1846 static inline u32 nfsd4_create_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1847 {
1848         return (op_encode_hdr_size + op_encode_change_info_maxsz
1849                 + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1850 }
1851 
1852 /*
1853  * Note since this is an idempotent operation we won't insist on failing
1854  * the op prematurely if the estimate is too large.  We may turn off splice
1855  * reads unnecessarily.
1856  */
1857 static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
1858                                       struct nfsd4_op *op)
1859 {
1860         u32 *bmap = op->u.getattr.ga_bmval;
1861         u32 bmap0 = bmap[0], bmap1 = bmap[1], bmap2 = bmap[2];
1862         u32 ret = 0;
1863 
1864         if (bmap0 & FATTR4_WORD0_ACL)
1865                 return svc_max_payload(rqstp);
1866         if (bmap0 & FATTR4_WORD0_FS_LOCATIONS)
1867                 return svc_max_payload(rqstp);
1868 
1869         if (bmap1 & FATTR4_WORD1_OWNER) {
1870                 ret += IDMAP_NAMESZ + 4;
1871                 bmap1 &= ~FATTR4_WORD1_OWNER;
1872         }
1873         if (bmap1 & FATTR4_WORD1_OWNER_GROUP) {
1874                 ret += IDMAP_NAMESZ + 4;
1875                 bmap1 &= ~FATTR4_WORD1_OWNER_GROUP;
1876         }
1877         if (bmap0 & FATTR4_WORD0_FILEHANDLE) {
1878                 ret += NFS4_FHSIZE + 4;
1879                 bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
1880         }
1881         if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
1882                 ret += NFS4_MAXLABELLEN + 12;
1883                 bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
1884         }
1885         /*
1886          * Largest of remaining attributes are 16 bytes (e.g.,
1887          * supported_attributes)
1888          */
1889         ret += 16 * (hweight32(bmap0) + hweight32(bmap1) + hweight32(bmap2));
1890         /* bitmask, length */
1891         ret += 20;
1892         return ret;
1893 }
1894 
1895 static inline u32 nfsd4_link_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1896 {
1897         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1898                 * sizeof(__be32);
1899 }
1900 
1901 static inline u32 nfsd4_lock_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1902 {
1903         return (op_encode_hdr_size + op_encode_lock_denied_maxsz)
1904                 * sizeof(__be32);
1905 }
1906 
1907 static inline u32 nfsd4_open_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1908 {
1909         return (op_encode_hdr_size + op_encode_stateid_maxsz
1910                 + op_encode_change_info_maxsz + 1
1911                 + nfs4_fattr_bitmap_maxsz
1912                 + op_encode_delegation_maxsz) * sizeof(__be32);
1913 }
1914 
1915 static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1916 {
1917         u32 maxcount = 0, rlen = 0;
1918 
1919         maxcount = svc_max_payload(rqstp);
1920         rlen = min(op->u.read.rd_length, maxcount);
1921 
1922         return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
1923 }
1924 
1925 static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1926 {
1927         u32 maxcount = 0, rlen = 0;
1928 
1929         maxcount = svc_max_payload(rqstp);
1930         rlen = min(op->u.readdir.rd_maxcount, maxcount);
1931 
1932         return (op_encode_hdr_size + op_encode_verifier_maxsz +
1933                 XDR_QUADLEN(rlen)) * sizeof(__be32);
1934 }
1935 
1936 static inline u32 nfsd4_remove_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1937 {
1938         return (op_encode_hdr_size + op_encode_change_info_maxsz)
1939                 * sizeof(__be32);
1940 }
1941 
1942 static inline u32 nfsd4_rename_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1943 {
1944         return (op_encode_hdr_size + op_encode_change_info_maxsz
1945                 + op_encode_change_info_maxsz) * sizeof(__be32);
1946 }
1947 
1948 static inline u32 nfsd4_sequence_rsize(struct svc_rqst *rqstp,
1949                                        struct nfsd4_op *op)
1950 {
1951         return (op_encode_hdr_size
1952                 + XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + 5) * sizeof(__be32);
1953 }
1954 
1955 static inline u32 nfsd4_setattr_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1956 {
1957         return (op_encode_hdr_size + nfs4_fattr_bitmap_maxsz) * sizeof(__be32);
1958 }
1959 
1960 static inline u32 nfsd4_setclientid_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1961 {
1962         return (op_encode_hdr_size + 2 + XDR_QUADLEN(NFS4_VERIFIER_SIZE)) *
1963                                                                 sizeof(__be32);
1964 }
1965 
1966 static inline u32 nfsd4_write_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1967 {
1968         return (op_encode_hdr_size + 2 + op_encode_verifier_maxsz) * sizeof(__be32);
1969 }
1970 
1971 static inline u32 nfsd4_exchange_id_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1972 {
1973         return (op_encode_hdr_size + 2 + 1 + /* eir_clientid, eir_sequenceid */\
1974                 1 + 1 + /* eir_flags, spr_how */\
1975                 4 + /* spo_must_enforce & _allow with bitmap */\
1976                 2 + /*eir_server_owner.so_minor_id */\
1977                 /* eir_server_owner.so_major_id<> */\
1978                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1979                 /* eir_server_scope<> */\
1980                 XDR_QUADLEN(NFS4_OPAQUE_LIMIT) + 1 +\
1981                 1 + /* eir_server_impl_id array length */\
1982                 0 /* ignored eir_server_impl_id contents */) * sizeof(__be32);
1983 }
1984 
1985 static inline u32 nfsd4_bind_conn_to_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1986 {
1987         return (op_encode_hdr_size + \
1988                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* bctsr_sessid */\
1989                 2 /* bctsr_dir, use_conn_in_rdma_mode */) * sizeof(__be32);
1990 }
1991 
1992 static inline u32 nfsd4_create_session_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
1993 {
1994         return (op_encode_hdr_size + \
1995                 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + /* sessionid */\
1996                 2 + /* csr_sequence, csr_flags */\
1997                 op_encode_channel_attrs_maxsz + \
1998                 op_encode_channel_attrs_maxsz) * sizeof(__be32);
1999 }
2000 
2001 static inline u32 nfsd4_copy_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2002 {
2003         return (op_encode_hdr_size +
2004                 1 /* wr_callback */ +
2005                 op_encode_stateid_maxsz /* wr_callback */ +
2006                 2 /* wr_count */ +
2007                 1 /* wr_committed */ +
2008                 op_encode_verifier_maxsz +
2009                 1 /* cr_consecutive */ +
2010                 1 /* cr_synchronous */) * sizeof(__be32);
2011 }
2012 
2013 #ifdef CONFIG_NFSD_PNFS
2014 /*
2015  * At this stage we don't really know what layout driver will handle the request,
2016  * so we need to define an arbitrary upper bound here.
2017  */
2018 #define MAX_LAYOUT_SIZE         128
2019 static inline u32 nfsd4_layoutget_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2020 {
2021         return (op_encode_hdr_size +
2022                 1 /* logr_return_on_close */ +
2023                 op_encode_stateid_maxsz +
2024                 1 /* nr of layouts */ +
2025                 MAX_LAYOUT_SIZE) * sizeof(__be32);
2026 }
2027 
2028 static inline u32 nfsd4_layoutcommit_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2029 {
2030         return (op_encode_hdr_size +
2031                 1 /* locr_newsize */ +
2032                 2 /* ns_size */) * sizeof(__be32);
2033 }
2034 
2035 static inline u32 nfsd4_layoutreturn_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
2036 {
2037         return (op_encode_hdr_size +
2038                 1 /* lrs_stateid */ +
2039                 op_encode_stateid_maxsz) * sizeof(__be32);
2040 }
2041 #endif /* CONFIG_NFSD_PNFS */
2042 
2043 static struct nfsd4_operation nfsd4_ops[] = {
2044         [OP_ACCESS] = {
2045                 .op_func = (nfsd4op_func)nfsd4_access,
2046                 .op_name = "OP_ACCESS",
2047         },
2048         [OP_CLOSE] = {
2049                 .op_func = (nfsd4op_func)nfsd4_close,
2050                 .op_flags = OP_MODIFIES_SOMETHING,
2051                 .op_name = "OP_CLOSE",
2052                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2053                 .op_get_currentstateid = (stateid_getter)nfsd4_get_closestateid,
2054                 .op_set_currentstateid = (stateid_setter)nfsd4_set_closestateid,
2055         },
2056         [OP_COMMIT] = {
2057                 .op_func = (nfsd4op_func)nfsd4_commit,
2058                 .op_flags = OP_MODIFIES_SOMETHING,
2059                 .op_name = "OP_COMMIT",
2060                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_commit_rsize,
2061         },
2062         [OP_CREATE] = {
2063                 .op_func = (nfsd4op_func)nfsd4_create,
2064                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME | OP_CLEAR_STATEID,
2065                 .op_name = "OP_CREATE",
2066                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_rsize,
2067         },
2068         [OP_DELEGRETURN] = {
2069                 .op_func = (nfsd4op_func)nfsd4_delegreturn,
2070                 .op_flags = OP_MODIFIES_SOMETHING,
2071                 .op_name = "OP_DELEGRETURN",
2072                 .op_rsize_bop = nfsd4_only_status_rsize,
2073                 .op_get_currentstateid = (stateid_getter)nfsd4_get_delegreturnstateid,
2074         },
2075         [OP_GETATTR] = {
2076                 .op_func = (nfsd4op_func)nfsd4_getattr,
2077                 .op_flags = ALLOWED_ON_ABSENT_FS,
2078                 .op_rsize_bop = nfsd4_getattr_rsize,
2079                 .op_name = "OP_GETATTR",
2080         },
2081         [OP_GETFH] = {
2082                 .op_func = (nfsd4op_func)nfsd4_getfh,
2083                 .op_name = "OP_GETFH",
2084         },
2085         [OP_LINK] = {
2086                 .op_func = (nfsd4op_func)nfsd4_link,
2087                 .op_flags = ALLOWED_ON_ABSENT_FS | OP_MODIFIES_SOMETHING
2088                                 | OP_CACHEME,
2089                 .op_name = "OP_LINK",
2090                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_link_rsize,
2091         },
2092         [OP_LOCK] = {
2093                 .op_func = (nfsd4op_func)nfsd4_lock,
2094                 .op_flags = OP_MODIFIES_SOMETHING,
2095                 .op_name = "OP_LOCK",
2096                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_lock_rsize,
2097                 .op_set_currentstateid = (stateid_setter)nfsd4_set_lockstateid,
2098         },
2099         [OP_LOCKT] = {
2100                 .op_func = (nfsd4op_func)nfsd4_lockt,
2101                 .op_name = "OP_LOCKT",
2102         },
2103         [OP_LOCKU] = {
2104                 .op_func = (nfsd4op_func)nfsd4_locku,
2105                 .op_flags = OP_MODIFIES_SOMETHING,
2106                 .op_name = "OP_LOCKU",
2107                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2108                 .op_get_currentstateid = (stateid_getter)nfsd4_get_lockustateid,
2109         },
2110         [OP_LOOKUP] = {
2111                 .op_func = (nfsd4op_func)nfsd4_lookup,
2112                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2113                 .op_name = "OP_LOOKUP",
2114         },
2115         [OP_LOOKUPP] = {
2116                 .op_func = (nfsd4op_func)nfsd4_lookupp,
2117                 .op_flags = OP_HANDLES_WRONGSEC | OP_CLEAR_STATEID,
2118                 .op_name = "OP_LOOKUPP",
2119         },
2120         [OP_NVERIFY] = {
2121                 .op_func = (nfsd4op_func)nfsd4_nverify,
2122                 .op_name = "OP_NVERIFY",
2123         },
2124         [OP_OPEN] = {
2125                 .op_func = (nfsd4op_func)nfsd4_open,
2126                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2127                 .op_name = "OP_OPEN",
2128                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_open_rsize,
2129                 .op_set_currentstateid = (stateid_setter)nfsd4_set_openstateid,
2130         },
2131         [OP_OPEN_CONFIRM] = {
2132                 .op_func = (nfsd4op_func)nfsd4_open_confirm,
2133                 .op_flags = OP_MODIFIES_SOMETHING,
2134                 .op_name = "OP_OPEN_CONFIRM",
2135                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2136         },
2137         [OP_OPEN_DOWNGRADE] = {
2138                 .op_func = (nfsd4op_func)nfsd4_open_downgrade,
2139                 .op_flags = OP_MODIFIES_SOMETHING,
2140                 .op_name = "OP_OPEN_DOWNGRADE",
2141                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_status_stateid_rsize,
2142                 .op_get_currentstateid = (stateid_getter)nfsd4_get_opendowngradestateid,
2143                 .op_set_currentstateid = (stateid_setter)nfsd4_set_opendowngradestateid,
2144         },
2145         [OP_PUTFH] = {
2146                 .op_func = (nfsd4op_func)nfsd4_putfh,
2147                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2148                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2149                 .op_name = "OP_PUTFH",
2150                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2151         },
2152         [OP_PUTPUBFH] = {
2153                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2154                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2155                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2156                 .op_name = "OP_PUTPUBFH",
2157                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2158         },
2159         [OP_PUTROOTFH] = {
2160                 .op_func = (nfsd4op_func)nfsd4_putrootfh,
2161                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2162                                 | OP_IS_PUTFH_LIKE | OP_CLEAR_STATEID,
2163                 .op_name = "OP_PUTROOTFH",
2164                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2165         },
2166         [OP_READ] = {
2167                 .op_func = (nfsd4op_func)nfsd4_read,
2168                 .op_name = "OP_READ",
2169                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_rsize,
2170                 .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
2171         },
2172         [OP_READDIR] = {
2173                 .op_func = (nfsd4op_func)nfsd4_readdir,
2174                 .op_name = "OP_READDIR",
2175                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_readdir_rsize,
2176         },
2177         [OP_READLINK] = {
2178                 .op_func = (nfsd4op_func)nfsd4_readlink,
2179                 .op_name = "OP_READLINK",
2180         },
2181         [OP_REMOVE] = {
2182                 .op_func = (nfsd4op_func)nfsd4_remove,
2183                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2184                 .op_name = "OP_REMOVE",
2185                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_remove_rsize,
2186         },
2187         [OP_RENAME] = {
2188                 .op_func = (nfsd4op_func)nfsd4_rename,
2189                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2190                 .op_name = "OP_RENAME",
2191                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_rename_rsize,
2192         },
2193         [OP_RENEW] = {
2194                 .op_func = (nfsd4op_func)nfsd4_renew,
2195                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2196                                 | OP_MODIFIES_SOMETHING,
2197                 .op_name = "OP_RENEW",
2198                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2199 
2200         },
2201         [OP_RESTOREFH] = {
2202                 .op_func = (nfsd4op_func)nfsd4_restorefh,
2203                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2204                                 | OP_IS_PUTFH_LIKE | OP_MODIFIES_SOMETHING,
2205                 .op_name = "OP_RESTOREFH",
2206                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2207         },
2208         [OP_SAVEFH] = {
2209                 .op_func = (nfsd4op_func)nfsd4_savefh,
2210                 .op_flags = OP_HANDLES_WRONGSEC | OP_MODIFIES_SOMETHING,
2211                 .op_name = "OP_SAVEFH",
2212                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2213         },
2214         [OP_SECINFO] = {
2215                 .op_func = (nfsd4op_func)nfsd4_secinfo,
2216                 .op_flags = OP_HANDLES_WRONGSEC,
2217                 .op_name = "OP_SECINFO",
2218         },
2219         [OP_SETATTR] = {
2220                 .op_func = (nfsd4op_func)nfsd4_setattr,
2221                 .op_name = "OP_SETATTR",
2222                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2223                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setattr_rsize,
2224                 .op_get_currentstateid = (stateid_getter)nfsd4_get_setattrstateid,
2225         },
2226         [OP_SETCLIENTID] = {
2227                 .op_func = (nfsd4op_func)nfsd4_setclientid,
2228                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2229                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2230                 .op_name = "OP_SETCLIENTID",
2231                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_setclientid_rsize,
2232         },
2233         [OP_SETCLIENTID_CONFIRM] = {
2234                 .op_func = (nfsd4op_func)nfsd4_setclientid_confirm,
2235                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2236                                 | OP_MODIFIES_SOMETHING | OP_CACHEME,
2237                 .op_name = "OP_SETCLIENTID_CONFIRM",
2238                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2239         },
2240         [OP_VERIFY] = {
2241                 .op_func = (nfsd4op_func)nfsd4_verify,
2242                 .op_name = "OP_VERIFY",
2243         },
2244         [OP_WRITE] = {
2245                 .op_func = (nfsd4op_func)nfsd4_write,
2246                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2247                 .op_name = "OP_WRITE",
2248                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
2249                 .op_get_currentstateid = (stateid_getter)nfsd4_get_writestateid,
2250         },
2251         [OP_RELEASE_LOCKOWNER] = {
2252                 .op_func = (nfsd4op_func)nfsd4_release_lockowner,
2253                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_ON_ABSENT_FS
2254                                 | OP_MODIFIES_SOMETHING,
2255                 .op_name = "OP_RELEASE_LOCKOWNER",
2256                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2257         },
2258 
2259         /* NFSv4.1 operations */
2260         [OP_EXCHANGE_ID] = {
2261                 .op_func = (nfsd4op_func)nfsd4_exchange_id,
2262                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2263                                 | OP_MODIFIES_SOMETHING,
2264                 .op_name = "OP_EXCHANGE_ID",
2265                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_exchange_id_rsize,
2266         },
2267         [OP_BACKCHANNEL_CTL] = {
2268                 .op_func = (nfsd4op_func)nfsd4_backchannel_ctl,
2269                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2270                 .op_name = "OP_BACKCHANNEL_CTL",
2271                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2272         },
2273         [OP_BIND_CONN_TO_SESSION] = {
2274                 .op_func = (nfsd4op_func)nfsd4_bind_conn_to_session,
2275                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2276                                 | OP_MODIFIES_SOMETHING,
2277                 .op_name = "OP_BIND_CONN_TO_SESSION",
2278                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_bind_conn_to_session_rsize,
2279         },
2280         [OP_CREATE_SESSION] = {
2281                 .op_func = (nfsd4op_func)nfsd4_create_session,
2282                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2283                                 | OP_MODIFIES_SOMETHING,
2284                 .op_name = "OP_CREATE_SESSION",
2285                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_create_session_rsize,
2286         },
2287         [OP_DESTROY_SESSION] = {
2288                 .op_func = (nfsd4op_func)nfsd4_destroy_session,
2289                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2290                                 | OP_MODIFIES_SOMETHING,
2291                 .op_name = "OP_DESTROY_SESSION",
2292                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2293         },
2294         [OP_SEQUENCE] = {
2295                 .op_func = (nfsd4op_func)nfsd4_sequence,
2296                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP,
2297                 .op_name = "OP_SEQUENCE",
2298                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_sequence_rsize,
2299         },
2300         [OP_DESTROY_CLIENTID] = {
2301                 .op_func = (nfsd4op_func)nfsd4_destroy_clientid,
2302                 .op_flags = ALLOWED_WITHOUT_FH | ALLOWED_AS_FIRST_OP
2303                                 | OP_MODIFIES_SOMETHING,
2304                 .op_name = "OP_DESTROY_CLIENTID",
2305                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2306         },
2307         [OP_RECLAIM_COMPLETE] = {
2308                 .op_func = (nfsd4op_func)nfsd4_reclaim_complete,
2309                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2310                 .op_name = "OP_RECLAIM_COMPLETE",
2311                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2312         },
2313         [OP_SECINFO_NO_NAME] = {
2314                 .op_func = (nfsd4op_func)nfsd4_secinfo_no_name,
2315                 .op_flags = OP_HANDLES_WRONGSEC,
2316                 .op_name = "OP_SECINFO_NO_NAME",
2317         },
2318         [OP_TEST_STATEID] = {
2319                 .op_func = (nfsd4op_func)nfsd4_test_stateid,
2320                 .op_flags = ALLOWED_WITHOUT_FH,
2321                 .op_name = "OP_TEST_STATEID",
2322         },
2323         [OP_FREE_STATEID] = {
2324                 .op_func = (nfsd4op_func)nfsd4_free_stateid,
2325                 .op_flags = ALLOWED_WITHOUT_FH | OP_MODIFIES_SOMETHING,
2326                 .op_name = "OP_FREE_STATEID",
2327                 .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid,
2328                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2329         },
2330 #ifdef CONFIG_NFSD_PNFS
2331         [OP_GETDEVICEINFO] = {
2332                 .op_func = (nfsd4op_func)nfsd4_getdeviceinfo,
2333                 .op_flags = ALLOWED_WITHOUT_FH,
2334                 .op_name = "OP_GETDEVICEINFO",
2335         },
2336         [OP_LAYOUTGET] = {
2337                 .op_func = (nfsd4op_func)nfsd4_layoutget,
2338                 .op_flags = OP_MODIFIES_SOMETHING,
2339                 .op_name = "OP_LAYOUTGET",
2340                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutget_rsize,
2341         },
2342         [OP_LAYOUTCOMMIT] = {
2343                 .op_func = (nfsd4op_func)nfsd4_layoutcommit,
2344                 .op_flags = OP_MODIFIES_SOMETHING,
2345                 .op_name = "OP_LAYOUTCOMMIT",
2346                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutcommit_rsize,
2347         },
2348         [OP_LAYOUTRETURN] = {
2349                 .op_func = (nfsd4op_func)nfsd4_layoutreturn,
2350                 .op_flags = OP_MODIFIES_SOMETHING,
2351                 .op_name = "OP_LAYOUTRETURN",
2352                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_layoutreturn_rsize,
2353         },
2354 #endif /* CONFIG_NFSD_PNFS */
2355 
2356         /* NFSv4.2 operations */
2357         [OP_ALLOCATE] = {
2358                 .op_func = (nfsd4op_func)nfsd4_allocate,
2359                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2360                 .op_name = "OP_ALLOCATE",
2361                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2362         },
2363         [OP_DEALLOCATE] = {
2364                 .op_func = (nfsd4op_func)nfsd4_deallocate,
2365                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2366                 .op_name = "OP_DEALLOCATE",
2367                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2368         },
2369         [OP_CLONE] = {
2370                 .op_func = (nfsd4op_func)nfsd4_clone,
2371                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2372                 .op_name = "OP_CLONE",
2373                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize,
2374         },
2375         [OP_COPY] = {
2376                 .op_func = (nfsd4op_func)nfsd4_copy,
2377                 .op_flags = OP_MODIFIES_SOMETHING | OP_CACHEME,
2378                 .op_name = "OP_COPY",
2379                 .op_rsize_bop = (nfsd4op_rsize)nfsd4_copy_rsize,
2380         },
2381         [OP_SEEK] = {
2382                 .op_func = (nfsd4op_func)nfsd4_seek,
2383                 .op_name = "OP_SEEK",
2384         },
2385 };
2386 
2387 /**
2388  * nfsd4_spo_must_allow - Determine if the compound op contains an
2389  * operation that is allowed to be sent with machine credentials
2390  *
2391  * @rqstp: a pointer to the struct svc_rqst
2392  *
2393  * Checks to see if the compound contains a spo_must_allow op
2394  * and confirms that it was sent with the proper machine creds.
2395  */
2396 
2397 bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
2398 {
2399         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2400         struct nfsd4_compoundargs *argp = rqstp->rq_argp;
2401         struct nfsd4_op *this = &argp->ops[resp->opcnt - 1];
2402         struct nfsd4_compound_state *cstate = &resp->cstate;
2403         struct nfs4_op_map *allow = &cstate->clp->cl_spo_must_allow;
2404         u32 opiter;
2405 
2406         if (!cstate->minorversion)
2407                 return false;
2408 
2409         if (cstate->spo_must_allowed == true)
2410                 return true;
2411 
2412         opiter = resp->opcnt;
2413         while (opiter < argp->opcnt) {
2414                 this = &argp->ops[opiter++];
2415                 if (test_bit(this->opnum, allow->u.longs) &&
2416                         cstate->clp->cl_mach_cred &&
2417                         nfsd4_mach_creds_match(cstate->clp, rqstp)) {
2418                         cstate->spo_must_allowed = true;
2419                         return true;
2420                 }
2421         }
2422         cstate->spo_must_allowed = false;
2423         return false;
2424 }
2425 
2426 int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op)
2427 {
2428         struct nfsd4_operation *opdesc;
2429         nfsd4op_rsize estimator;
2430 
2431         if (op->opnum == OP_ILLEGAL)
2432                 return op_encode_hdr_size * sizeof(__be32);
2433         opdesc = OPDESC(op);
2434         estimator = opdesc->op_rsize_bop;
2435         return estimator ? estimator(rqstp, op) : PAGE_SIZE;
2436 }
2437 
2438 void warn_on_nonidempotent_op(struct nfsd4_op *op)
2439 {
2440         if (OPDESC(op)->op_flags & OP_MODIFIES_SOMETHING) {
2441                 pr_err("unable to encode reply to nonidempotent op %d (%s)\n",
2442                         op->opnum, nfsd4_op_name(op->opnum));
2443                 WARN_ON_ONCE(1);
2444         }
2445 }
2446 
2447 static const char *nfsd4_op_name(unsigned opnum)
2448 {
2449         if (opnum < ARRAY_SIZE(nfsd4_ops))
2450                 return nfsd4_ops[opnum].op_name;
2451         return "unknown_operation";
2452 }
2453 
2454 #define nfsd4_voidres                   nfsd4_voidargs
2455 struct nfsd4_voidargs { int dummy; };
2456 
2457 static struct svc_procedure             nfsd_procedures4[2] = {
2458         [NFSPROC4_NULL] = {
2459                 .pc_func = (svc_procfunc) nfsd4_proc_null,
2460                 .pc_encode = (kxdrproc_t) nfs4svc_encode_voidres,
2461                 .pc_argsize = sizeof(struct nfsd4_voidargs),
2462                 .pc_ressize = sizeof(struct nfsd4_voidres),
2463                 .pc_cachetype = RC_NOCACHE,
2464                 .pc_xdrressize = 1,
2465         },
2466         [NFSPROC4_COMPOUND] = {
2467                 .pc_func = (svc_procfunc) nfsd4_proc_compound,
2468                 .pc_decode = (kxdrproc_t) nfs4svc_decode_compoundargs,
2469                 .pc_encode = (kxdrproc_t) nfs4svc_encode_compoundres,
2470                 .pc_argsize = sizeof(struct nfsd4_compoundargs),
2471                 .pc_ressize = sizeof(struct nfsd4_compoundres),
2472                 .pc_release = nfsd4_release_compoundargs,
2473                 .pc_cachetype = RC_NOCACHE,
2474                 .pc_xdrressize = NFSD_BUFSIZE/4,
2475         },
2476 };
2477 
2478 struct svc_version      nfsd_version4 = {
2479                 .vs_vers        = 4,
2480                 .vs_nproc       = 2,
2481                 .vs_proc        = nfsd_procedures4,
2482                 .vs_dispatch    = nfsd_dispatch,
2483                 .vs_xdrsize     = NFS4_SVC_XDRSIZE,
2484                 .vs_rpcb_optnl  = 1,
2485 };
2486 
2487 /*
2488  * Local variables:
2489  *  c-basic-offset: 8
2490  * End:
2491  */
2492 

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