blob: 6adabd6049b7199ad72e01e361e3637a88b016ff [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Common NFSv4 ACL handling code.
3 *
4 * Copyright (c) 2002, 2003 The Regents of the University of Michigan.
5 * All rights reserved.
6 *
7 * Marius Aamodt Eriksen <marius@umich.edu>
8 * Jeff Sedlak <jsedlak@umich.edu>
9 * J. Bruce Fields <bfields@umich.edu>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its
21 * contributors may be used to endorse or promote products derived
22 * from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
31 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
Kinglong Meefaf996a2015-07-03 19:34:53 +080037#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090038#include <linux/slab.h>
Kinglong Meefaf996a2015-07-03 19:34:53 +080039#include <linux/posix_acl.h>
40
Christoph Hellwig4ac72492013-12-20 05:16:55 -080041#include "nfsfh.h"
J. Bruce Fields35541162014-01-08 09:49:01 -050042#include "nfsd.h"
J. Bruce Fields2ca72e12011-01-04 17:37:15 -050043#include "acl.h"
Christoph Hellwig4ac72492013-12-20 05:16:55 -080044#include "vfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Christoph Hellwig4ac72492013-12-20 05:16:55 -080046#define NFS4_ACL_TYPE_DEFAULT 0x01
47#define NFS4_ACL_DIR 0x02
48#define NFS4_ACL_OWNER 0x04
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
50/* mode bit translations: */
51#define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
52#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
53#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
54#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
55#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/* flags used to simulate posix default ACLs */
58#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
J. Bruce Fields7bdfa682007-02-16 01:28:28 -080059 | NFS4_ACE_DIRECTORY_INHERIT_ACE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
J. Bruce Fields7bdfa682007-02-16 01:28:28 -080061#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
62 | NFS4_ACE_INHERIT_ONLY_ACE \
63 | NFS4_ACE_IDENTIFIER_GROUP)
J.Bruce Fieldsb548edc2006-10-04 02:16:12 -070064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static u32
66mask_from_posix(unsigned short perm, unsigned int flags)
67{
68 int mask = NFS4_ANYONE_MODE;
69
70 if (flags & NFS4_ACL_OWNER)
71 mask |= NFS4_OWNER_MODE;
72 if (perm & ACL_READ)
73 mask |= NFS4_READ_MODE;
74 if (perm & ACL_WRITE)
75 mask |= NFS4_WRITE_MODE;
76 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
77 mask |= NFS4_ACE_DELETE_CHILD;
78 if (perm & ACL_EXECUTE)
79 mask |= NFS4_EXECUTE_MODE;
80 return mask;
81}
82
83static u32
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -080084deny_mask_from_posix(unsigned short perm, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -080086 u32 mask = 0;
87
88 if (perm & ACL_READ)
89 mask |= NFS4_READ_MODE;
90 if (perm & ACL_WRITE)
91 mask |= NFS4_WRITE_MODE;
92 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
93 mask |= NFS4_ACE_DELETE_CHILD;
94 if (perm & ACL_EXECUTE)
95 mask |= NFS4_EXECUTE_MODE;
96 return mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
99/* XXX: modify functions to return NFS errors; they're only ever
100 * used by nfs code, after all.... */
101
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700102/* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
103 * side of being more restrictive, so the mode bit mapping below is
104 * pessimistic. An optimistic version would be needed to handle DENY's,
Andreas Gruenbachere5386742015-08-11 11:30:31 +0200105 * but we expect to coalesce all ALLOWs and DENYs before mapping to mode
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700106 * bits. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700108static void
109low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
110{
111 u32 write_mode = NFS4_WRITE_MODE;
112
113 if (flags & NFS4_ACL_DIR)
114 write_mode |= NFS4_ACE_DELETE_CHILD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 *mode = 0;
116 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
117 *mode |= ACL_READ;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700118 if ((perm & write_mode) == write_mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 *mode |= ACL_WRITE;
120 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
121 *mode |= ACL_EXECUTE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static short ace2type(struct nfs4_ace *);
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800125static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
126 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800128int
129nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
130 struct nfs4_acl **acl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
David Howells2b0143b2015-03-17 22:25:59 +0000132 struct inode *inode = d_inode(dentry);
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800133 int error = 0;
134 struct posix_acl *pacl = NULL, *dpacl = NULL;
135 unsigned int flags = 0;
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800136 int size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800138 pacl = get_acl(inode, ACL_TYPE_ACCESS);
Kinglong Mee35e634b2014-07-09 21:54:16 +0800139 if (!pacl)
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800140 pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
Kinglong Mee35e634b2014-07-09 21:54:16 +0800141
142 if (IS_ERR(pacl))
143 return PTR_ERR(pacl);
144
J. Bruce Fields09bdc2d2014-02-11 11:29:05 -0500145 /* allocate for worst case: one (deny, allow) pair each: */
146 size += 2 * pacl->a_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800148 if (S_ISDIR(inode->i_mode)) {
149 flags = NFS4_ACL_DIR;
150 dpacl = get_acl(inode, ACL_TYPE_DEFAULT);
Kinglong Mee35e634b2014-07-09 21:54:16 +0800151 if (IS_ERR(dpacl)) {
152 error = PTR_ERR(dpacl);
153 goto rel_pacl;
154 }
155
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800156 if (dpacl)
157 size += 2 * dpacl->a_count;
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800158 }
159
J. Bruce Fieldsbcaab952014-06-24 17:51:21 -0400160 *acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL);
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800161 if (*acl == NULL) {
162 error = -ENOMEM;
163 goto out;
164 }
J. Bruce Fieldsbcaab952014-06-24 17:51:21 -0400165 (*acl)->naces = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
J. Bruce Fields09bdc2d2014-02-11 11:29:05 -0500167 _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800169 if (dpacl)
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800170 _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171
Kinglong Mee35e634b2014-07-09 21:54:16 +0800172out:
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800173 posix_acl_release(dpacl);
Kinglong Mee35e634b2014-07-09 21:54:16 +0800174rel_pacl:
175 posix_acl_release(pacl);
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800176 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800179struct posix_acl_summary {
180 unsigned short owner;
181 unsigned short users;
182 unsigned short group;
183 unsigned short groups;
184 unsigned short other;
185 unsigned short mask;
186};
187
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800188static void
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800189summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800191 struct posix_acl_entry *pa, *pe;
J. Bruce Fieldsf7fede42007-07-17 04:04:36 -0700192
193 /*
194 * Only pas.users and pas.groups need initialization; previous
195 * posix_acl_valid() calls ensure that the other fields will be
196 * initialized in the following loop. But, just to placate gcc:
197 */
198 memset(pas, 0, sizeof(*pas));
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800199 pas->mask = 07;
200
201 pe = acl->a_entries + acl->a_count;
202
203 FOREACH_ACL_ENTRY(pa, acl, pe) {
204 switch (pa->e_tag) {
205 case ACL_USER_OBJ:
206 pas->owner = pa->e_perm;
207 break;
208 case ACL_GROUP_OBJ:
209 pas->group = pa->e_perm;
210 break;
211 case ACL_USER:
212 pas->users |= pa->e_perm;
213 break;
214 case ACL_GROUP:
215 pas->groups |= pa->e_perm;
216 break;
217 case ACL_OTHER:
218 pas->other = pa->e_perm;
219 break;
220 case ACL_MASK:
221 pas->mask = pa->e_perm;
222 break;
223 }
224 }
225 /* We'll only care about effective permissions: */
226 pas->users &= pas->mask;
227 pas->group &= pas->mask;
228 pas->groups &= pas->mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}
230
231/* We assume the acl has been verified with posix_acl_valid. */
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800232static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
234 unsigned int flags)
235{
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800236 struct posix_acl_entry *pa, *group_owner_entry;
237 struct nfs4_ace *ace;
238 struct posix_acl_summary pas;
239 unsigned short deny;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
Bruce Fields54c044092007-03-26 21:32:09 -0800241 NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 BUG_ON(pacl->a_count < 3);
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800244 summarize_posix_acl(pacl, &pas);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246 pa = pacl->a_entries;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800247 ace = acl->aces + acl->naces;
248
249 /* We could deny everything not granted by the owner: */
250 deny = ~pas.owner;
251 /*
252 * but it is equivalent (and simpler) to deny only what is not
253 * granted by later entries:
254 */
255 deny &= pas.users | pas.group | pas.groups | pas.other;
256 if (deny) {
257 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
258 ace->flag = eflag;
259 ace->access_mask = deny_mask_from_posix(deny, flags);
260 ace->whotype = NFS4_ACL_WHO_OWNER;
261 ace++;
262 acl->naces++;
263 }
264
265 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
266 ace->flag = eflag;
267 ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
268 ace->whotype = NFS4_ACL_WHO_OWNER;
269 ace++;
270 acl->naces++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 pa++;
272
273 while (pa->e_tag == ACL_USER) {
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800274 deny = ~(pa->e_perm & pas.mask);
275 deny &= pas.groups | pas.group | pas.other;
276 if (deny) {
277 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
278 ace->flag = eflag;
279 ace->access_mask = deny_mask_from_posix(deny, flags);
280 ace->whotype = NFS4_ACL_WHO_NAMED;
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800281 ace->who_uid = pa->e_uid;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800282 ace++;
283 acl->naces++;
284 }
285 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
286 ace->flag = eflag;
287 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
288 flags);
289 ace->whotype = NFS4_ACL_WHO_NAMED;
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800290 ace->who_uid = pa->e_uid;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800291 ace++;
292 acl->naces++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 pa++;
294 }
295
296 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
297 * since a user can be in more than one group. */
298
299 /* allow ACEs */
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 group_owner_entry = pa;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800302
303 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
304 ace->flag = eflag;
305 ace->access_mask = mask_from_posix(pas.group, flags);
306 ace->whotype = NFS4_ACL_WHO_GROUP;
307 ace++;
308 acl->naces++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 pa++;
310
311 while (pa->e_tag == ACL_GROUP) {
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800312 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
313 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
314 ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
315 flags);
316 ace->whotype = NFS4_ACL_WHO_NAMED;
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800317 ace->who_gid = pa->e_gid;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800318 ace++;
319 acl->naces++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 pa++;
321 }
322
323 /* deny ACEs */
324
325 pa = group_owner_entry;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800326
327 deny = ~pas.group & pas.other;
328 if (deny) {
329 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
Frank Filzd8d0b852009-08-27 17:35:41 -0400330 ace->flag = eflag;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800331 ace->access_mask = deny_mask_from_posix(deny, flags);
332 ace->whotype = NFS4_ACL_WHO_GROUP;
333 ace++;
334 acl->naces++;
335 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 pa++;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 while (pa->e_tag == ACL_GROUP) {
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800339 deny = ~(pa->e_perm & pas.mask);
340 deny &= pas.other;
341 if (deny) {
342 ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
343 ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
Frank Filz55bb55d2009-08-14 15:02:30 -0700344 ace->access_mask = deny_mask_from_posix(deny, flags);
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800345 ace->whotype = NFS4_ACL_WHO_NAMED;
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800346 ace->who_gid = pa->e_gid;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800347 ace++;
348 acl->naces++;
349 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 pa++;
351 }
352
353 if (pa->e_tag == ACL_MASK)
354 pa++;
J. Bruce Fieldsbec50c42007-02-16 01:28:36 -0800355 ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
356 ace->flag = eflag;
357 ace->access_mask = mask_from_posix(pa->e_perm, flags);
358 ace->whotype = NFS4_ACL_WHO_EVERYONE;
359 acl->naces++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360}
361
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800362static bool
363pace_gt(struct posix_acl_entry *pace1, struct posix_acl_entry *pace2)
364{
365 if (pace1->e_tag != pace2->e_tag)
366 return pace1->e_tag > pace2->e_tag;
367 if (pace1->e_tag == ACL_USER)
368 return uid_gt(pace1->e_uid, pace2->e_uid);
369 if (pace1->e_tag == ACL_GROUP)
370 return gid_gt(pace1->e_gid, pace2->e_gid);
371 return false;
372}
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374static void
375sort_pacl_range(struct posix_acl *pacl, int start, int end) {
376 int sorted = 0, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 /* We just do a bubble sort; easy to do in place, and we're not
379 * expecting acl's to be long enough to justify anything more. */
380 while (!sorted) {
381 sorted = 1;
382 for (i = start; i < end; i++) {
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800383 if (pace_gt(&pacl->a_entries[i],
384 &pacl->a_entries[i+1])) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 sorted = 0;
Fabian Frederick97b1f9a2015-06-12 18:58:57 +0200386 swap(pacl->a_entries[i],
387 pacl->a_entries[i + 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389 }
390 }
391}
392
393static void
394sort_pacl(struct posix_acl *pacl)
395{
396 /* posix_acl_valid requires that users and groups be in order
397 * by uid/gid. */
398 int i, j;
399
Kinglong Meeaa07c712014-04-18 20:49:04 +0800400 /* no users or groups */
401 if (!pacl || pacl->a_count <= 4)
402 return;
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 i = 1;
405 while (pacl->a_entries[i].e_tag == ACL_USER)
406 i++;
407 sort_pacl_range(pacl, 1, i-1);
408
409 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
Frank Filzaba24d72009-10-21 16:45:02 -0700410 j = ++i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 while (pacl->a_entries[j].e_tag == ACL_GROUP)
412 j++;
413 sort_pacl_range(pacl, i, j-1);
414 return;
415}
416
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700417/*
418 * While processing the NFSv4 ACE, this maintains bitmasks representing
419 * which permission bits have been allowed and which denied to a given
420 * entity: */
421struct posix_ace_state {
422 u32 allow;
423 u32 deny;
424};
425
426struct posix_user_ace_state {
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800427 union {
428 kuid_t uid;
429 kgid_t gid;
430 };
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700431 struct posix_ace_state perms;
432};
433
434struct posix_ace_state_array {
435 int n;
436 struct posix_user_ace_state aces[];
437};
438
439/*
440 * While processing the NFSv4 ACE, this maintains the partial permissions
441 * calculated so far: */
442
443struct posix_acl_state {
J. Bruce Fields3160a712007-02-16 01:28:37 -0800444 int empty;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700445 struct posix_ace_state owner;
446 struct posix_ace_state group;
447 struct posix_ace_state other;
448 struct posix_ace_state everyone;
449 struct posix_ace_state mask; /* Deny unused in this case */
450 struct posix_ace_state_array *users;
451 struct posix_ace_state_array *groups;
452};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454static int
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700455init_state(struct posix_acl_state *state, int cnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700457 int alloc;
458
459 memset(state, 0, sizeof(struct posix_acl_state));
J. Bruce Fields3160a712007-02-16 01:28:37 -0800460 state->empty = 1;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700461 /*
462 * In the worst case, each individual acl could be for a distinct
Andreas Gruenbachere5386742015-08-11 11:30:31 +0200463 * named user or group, but we don't know which, so we allocate
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700464 * enough space for either:
465 */
466 alloc = sizeof(struct posix_ace_state_array)
J. Bruce Fields91b80962008-08-29 19:18:45 -0400467 + cnt*sizeof(struct posix_user_ace_state);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700468 state->users = kzalloc(alloc, GFP_KERNEL);
469 if (!state->users)
470 return -ENOMEM;
471 state->groups = kzalloc(alloc, GFP_KERNEL);
472 if (!state->groups) {
473 kfree(state->users);
474 return -ENOMEM;
475 }
476 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700479static void
480free_state(struct posix_acl_state *state) {
481 kfree(state->users);
482 kfree(state->groups);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700485static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486{
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700487 state->mask.allow |= astate->allow;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488}
489
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700490static struct posix_acl *
491posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492{
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700493 struct posix_acl_entry *pace;
494 struct posix_acl *pacl;
495 int nace;
J. Bruce Fieldsb14f4f72015-03-26 10:37:51 -0400496 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
J. Bruce Fields3160a712007-02-16 01:28:37 -0800498 /*
499 * ACLs with no ACEs are treated differently in the inheritable
Kinglong Meeaa07c712014-04-18 20:49:04 +0800500 * and effective cases: when there are no inheritable ACEs,
501 * calls ->set_acl with a NULL ACL structure.
J. Bruce Fields3160a712007-02-16 01:28:37 -0800502 */
Kinglong Meeaa07c712014-04-18 20:49:04 +0800503 if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT))
504 return NULL;
505
J. Bruce Fields3160a712007-02-16 01:28:37 -0800506 /*
507 * When there are no effective ACEs, the following will end
508 * up setting a 3-element effective posix ACL with all
509 * permissions zero.
510 */
J. Bruce Fields06f9cc12014-04-02 14:59:08 -0400511 if (!state->users->n && !state->groups->n)
512 nace = 3;
513 else /* Note we also include a MASK ACE in this case: */
514 nace = 4 + state->users->n + state->groups->n;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700515 pacl = posix_acl_alloc(nace, GFP_KERNEL);
516 if (!pacl)
517 return ERR_PTR(-ENOMEM);
518
519 pace = pacl->a_entries;
520 pace->e_tag = ACL_USER_OBJ;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700521 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700522
523 for (i=0; i < state->users->n; i++) {
524 pace++;
525 pace->e_tag = ACL_USER;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700526 low_mode_from_nfs4(state->users->aces[i].perms.allow,
527 &pace->e_perm, flags);
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800528 pace->e_uid = state->users->aces[i].uid;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700529 add_to_mask(state, &state->users->aces[i].perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 }
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700531
532 pace++;
533 pace->e_tag = ACL_GROUP_OBJ;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700534 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700535 add_to_mask(state, &state->group);
536
537 for (i=0; i < state->groups->n; i++) {
538 pace++;
539 pace->e_tag = ACL_GROUP;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700540 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
541 &pace->e_perm, flags);
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800542 pace->e_gid = state->groups->aces[i].gid;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700543 add_to_mask(state, &state->groups->aces[i].perms);
544 }
545
J. Bruce Fields5513a512014-05-14 21:57:26 -0400546 if (state->users->n || state->groups->n) {
J. Bruce Fields06f9cc12014-04-02 14:59:08 -0400547 pace++;
548 pace->e_tag = ACL_MASK;
549 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
550 }
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700551
552 pace++;
553 pace->e_tag = ACL_OTHER;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700554 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700555
556 return pacl;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700559static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700561 /* Allow all bits in the mask not already denied: */
562 astate->allow |= mask & ~astate->deny;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563}
564
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700565static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700567 /* Deny all bits in the mask not already allowed: */
568 astate->deny |= mask & ~astate->allow;
569}
570
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800571static int find_uid(struct posix_acl_state *state, kuid_t uid)
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700572{
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800573 struct posix_ace_state_array *a = state->users;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700574 int i;
575
576 for (i = 0; i < a->n; i++)
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800577 if (uid_eq(a->aces[i].uid, uid))
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700578 return i;
579 /* Not found: */
580 a->n++;
581 a->aces[i].uid = uid;
582 a->aces[i].perms.allow = state->everyone.allow;
583 a->aces[i].perms.deny = state->everyone.deny;
584
585 return i;
586}
587
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800588static int find_gid(struct posix_acl_state *state, kgid_t gid)
589{
590 struct posix_ace_state_array *a = state->groups;
591 int i;
592
593 for (i = 0; i < a->n; i++)
594 if (gid_eq(a->aces[i].gid, gid))
595 return i;
596 /* Not found: */
597 a->n++;
598 a->aces[i].gid = gid;
599 a->aces[i].perms.allow = state->everyone.allow;
600 a->aces[i].perms.deny = state->everyone.deny;
601
602 return i;
603}
604
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700605static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
606{
607 int i;
608
609 for (i=0; i < a->n; i++)
610 deny_bits(&a->aces[i].perms, mask);
611}
612
613static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
614{
615 int i;
616
617 for (i=0; i < a->n; i++)
618 allow_bits(&a->aces[i].perms, mask);
619}
620
621static void process_one_v4_ace(struct posix_acl_state *state,
622 struct nfs4_ace *ace)
623{
624 u32 mask = ace->access_mask;
625 int i;
626
J. Bruce Fields3160a712007-02-16 01:28:37 -0800627 state->empty = 0;
628
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700629 switch (ace2type(ace)) {
630 case ACL_USER_OBJ:
631 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
632 allow_bits(&state->owner, mask);
633 } else {
634 deny_bits(&state->owner, mask);
635 }
636 break;
637 case ACL_USER:
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800638 i = find_uid(state, ace->who_uid);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700639 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
640 allow_bits(&state->users->aces[i].perms, mask);
641 } else {
642 deny_bits(&state->users->aces[i].perms, mask);
643 mask = state->users->aces[i].perms.deny;
644 deny_bits(&state->owner, mask);
645 }
646 break;
647 case ACL_GROUP_OBJ:
648 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
649 allow_bits(&state->group, mask);
650 } else {
651 deny_bits(&state->group, mask);
652 mask = state->group.deny;
653 deny_bits(&state->owner, mask);
654 deny_bits(&state->everyone, mask);
655 deny_bits_array(state->users, mask);
656 deny_bits_array(state->groups, mask);
657 }
658 break;
659 case ACL_GROUP:
Eric W. Biedermanab8e4ae2013-02-02 05:18:08 -0800660 i = find_gid(state, ace->who_gid);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700661 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
662 allow_bits(&state->groups->aces[i].perms, mask);
663 } else {
664 deny_bits(&state->groups->aces[i].perms, mask);
665 mask = state->groups->aces[i].perms.deny;
666 deny_bits(&state->owner, mask);
667 deny_bits(&state->group, mask);
668 deny_bits(&state->everyone, mask);
669 deny_bits_array(state->users, mask);
670 deny_bits_array(state->groups, mask);
671 }
672 break;
673 case ACL_OTHER:
674 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
675 allow_bits(&state->owner, mask);
676 allow_bits(&state->group, mask);
677 allow_bits(&state->other, mask);
678 allow_bits(&state->everyone, mask);
679 allow_bits_array(state->users, mask);
680 allow_bits_array(state->groups, mask);
681 } else {
682 deny_bits(&state->owner, mask);
683 deny_bits(&state->group, mask);
684 deny_bits(&state->other, mask);
685 deny_bits(&state->everyone, mask);
686 deny_bits_array(state->users, mask);
687 deny_bits_array(state->groups, mask);
688 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 }
690}
691
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800692static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
693 struct posix_acl **pacl, struct posix_acl **dpacl,
694 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
J. Bruce Fields575a6292007-02-16 01:28:29 -0800696 struct posix_acl_state effective_acl_state, default_acl_state;
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700697 struct nfs4_ace *ace;
698 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
J. Bruce Fields575a6292007-02-16 01:28:29 -0800700 ret = init_state(&effective_acl_state, acl->naces);
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700701 if (ret)
J. Bruce Fields575a6292007-02-16 01:28:29 -0800702 return ret;
703 ret = init_state(&default_acl_state, acl->naces);
704 if (ret)
705 goto out_estate;
706 ret = -EINVAL;
J. Bruce Fields28e05dd2007-02-16 01:28:30 -0800707 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
J.Bruce Fields09229ed2006-10-04 02:16:11 -0700708 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
709 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
J. Bruce Fields575a6292007-02-16 01:28:29 -0800710 goto out_dstate;
J.Bruce Fieldsb548edc2006-10-04 02:16:12 -0700711 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
J. Bruce Fields575a6292007-02-16 01:28:29 -0800712 goto out_dstate;
J. Bruce Fields7bdfa682007-02-16 01:28:28 -0800713 if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
J. Bruce Fields575a6292007-02-16 01:28:29 -0800714 process_one_v4_ace(&effective_acl_state, ace);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 continue;
J. Bruce Fields7bdfa682007-02-16 01:28:28 -0800716 }
J. Bruce Fields575a6292007-02-16 01:28:29 -0800717 if (!(flags & NFS4_ACL_DIR))
718 goto out_dstate;
J. Bruce Fields7bdfa682007-02-16 01:28:28 -0800719 /*
720 * Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
721 * is set, we're effectively turning on the other. That's OK,
722 * according to rfc 3530.
723 */
J. Bruce Fields575a6292007-02-16 01:28:29 -0800724 process_one_v4_ace(&default_acl_state, ace);
725
726 if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
727 process_one_v4_ace(&effective_acl_state, ace);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 }
J. Bruce Fields575a6292007-02-16 01:28:29 -0800729 *pacl = posix_state_to_acl(&effective_acl_state, flags);
730 if (IS_ERR(*pacl)) {
731 ret = PTR_ERR(*pacl);
J. Bruce Fields4b2ca382007-07-17 04:04:37 -0700732 *pacl = NULL;
J. Bruce Fields575a6292007-02-16 01:28:29 -0800733 goto out_dstate;
734 }
J. Bruce Fields3160a712007-02-16 01:28:37 -0800735 *dpacl = posix_state_to_acl(&default_acl_state,
736 flags | NFS4_ACL_TYPE_DEFAULT);
J. Bruce Fields575a6292007-02-16 01:28:29 -0800737 if (IS_ERR(*dpacl)) {
738 ret = PTR_ERR(*dpacl);
J. Bruce Fields4b2ca382007-07-17 04:04:37 -0700739 *dpacl = NULL;
J. Bruce Fields575a6292007-02-16 01:28:29 -0800740 posix_acl_release(*pacl);
J. Bruce Fields4b2ca382007-07-17 04:04:37 -0700741 *pacl = NULL;
J. Bruce Fields575a6292007-02-16 01:28:29 -0800742 goto out_dstate;
743 }
744 sort_pacl(*pacl);
745 sort_pacl(*dpacl);
746 ret = 0;
747out_dstate:
748 free_state(&default_acl_state);
749out_estate:
750 free_state(&effective_acl_state);
751 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752}
753
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800754__be32
755nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
756 struct nfs4_acl *acl)
757{
758 __be32 error;
759 int host_error;
760 struct dentry *dentry;
761 struct inode *inode;
762 struct posix_acl *pacl = NULL, *dpacl = NULL;
763 unsigned int flags = 0;
764
765 /* Get inode */
766 error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR);
767 if (error)
768 return error;
769
770 dentry = fhp->fh_dentry;
David Howells2b0143b2015-03-17 22:25:59 +0000771 inode = d_inode(dentry);
Christoph Hellwig4ac72492013-12-20 05:16:55 -0800772
773 if (!inode->i_op->set_acl || !IS_POSIXACL(inode))
774 return nfserr_attrnotsupp;
775
776 if (S_ISDIR(inode->i_mode))
777 flags = NFS4_ACL_DIR;
778
779 host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
780 if (host_error == -EINVAL)
781 return nfserr_attrnotsupp;
782 if (host_error < 0)
783 goto out_nfserr;
784
785 host_error = inode->i_op->set_acl(inode, pacl, ACL_TYPE_ACCESS);
786 if (host_error < 0)
787 goto out_release;
788
789 if (S_ISDIR(inode->i_mode)) {
790 host_error = inode->i_op->set_acl(inode, dpacl,
791 ACL_TYPE_DEFAULT);
792 }
793
794out_release:
795 posix_acl_release(pacl);
796 posix_acl_release(dpacl);
797out_nfserr:
798 if (host_error == -EOPNOTSUPP)
799 return nfserr_attrnotsupp;
800 else
801 return nfserrno(host_error);
802}
803
804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805static short
806ace2type(struct nfs4_ace *ace)
807{
808 switch (ace->whotype) {
809 case NFS4_ACL_WHO_NAMED:
810 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
811 ACL_GROUP : ACL_USER);
812 case NFS4_ACL_WHO_OWNER:
813 return ACL_USER_OBJ;
814 case NFS4_ACL_WHO_GROUP:
815 return ACL_GROUP_OBJ;
816 case NFS4_ACL_WHO_EVERYONE:
817 return ACL_OTHER;
818 }
819 BUG();
820 return -1;
821}
822
J. Bruce Fieldsbcaab952014-06-24 17:51:21 -0400823/*
824 * return the size of the struct nfs4_acl required to represent an acl
825 * with @entries entries.
826 */
827int nfs4_acl_bytes(int entries)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828{
J. Bruce Fieldsbcaab952014-06-24 17:51:21 -0400829 return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832static struct {
833 char *string;
834 int stringlen;
835 int type;
836} s2t_map[] = {
837 {
838 .string = "OWNER@",
839 .stringlen = sizeof("OWNER@") - 1,
840 .type = NFS4_ACL_WHO_OWNER,
841 },
842 {
843 .string = "GROUP@",
844 .stringlen = sizeof("GROUP@") - 1,
845 .type = NFS4_ACL_WHO_GROUP,
846 },
847 {
848 .string = "EVERYONE@",
849 .stringlen = sizeof("EVERYONE@") - 1,
850 .type = NFS4_ACL_WHO_EVERYONE,
851 },
852};
853
854int
855nfs4_acl_get_whotype(char *p, u32 len)
856{
857 int i;
858
Tobias Klausere8c96f82006-03-24 03:15:34 -0800859 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (s2t_map[i].stringlen == len &&
861 0 == memcmp(s2t_map[i].string, p, len))
862 return s2t_map[i].type;
863 }
864 return NFS4_ACL_WHO_NAMED;
865}
866
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400867__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868{
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400869 __be32 *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 int i;
871
Tobias Klausere8c96f82006-03-24 03:15:34 -0800872 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
J. Bruce Fields35541162014-01-08 09:49:01 -0500873 if (s2t_map[i].type != who)
874 continue;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400875 p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4);
876 if (!p)
J. Bruce Fields35541162014-01-08 09:49:01 -0500877 return nfserr_resource;
J. Bruce Fieldsddd1ea52013-08-27 21:32:25 -0400878 p = xdr_encode_opaque(p, s2t_map[i].string,
J. Bruce Fields35541162014-01-08 09:49:01 -0500879 s2t_map[i].stringlen);
J. Bruce Fields35541162014-01-08 09:49:01 -0500880 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 }
J. Bruce Fields35541162014-01-08 09:49:01 -0500882 WARN_ON_ONCE(1);
Jeff Laytonf7ce5d22014-06-17 06:14:08 -0400883 return nfserr_serverfault;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884}