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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/f2fs/acl.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 *
8 * Portions of this code from linux/fs/ext2/acl.c
9 *
10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
11 */
12#include <linux/f2fs_fs.h>
13#include "f2fs.h"
14#include "xattr.h"
15#include "acl.h"
16
17static inline size_t f2fs_acl_size(int count)
18{
19 if (count <= 4) {
20 return sizeof(struct f2fs_acl_header) +
21 count * sizeof(struct f2fs_acl_entry_short);
22 } else {
23 return sizeof(struct f2fs_acl_header) +
24 4 * sizeof(struct f2fs_acl_entry_short) +
25 (count - 4) * sizeof(struct f2fs_acl_entry);
26 }
27}
28
29static inline int f2fs_acl_count(size_t size)
30{
31 ssize_t s;
32
33 size -= sizeof(struct f2fs_acl_header);
34 s = size - 4 * sizeof(struct f2fs_acl_entry_short);
35 if (s < 0) {
36 if (size % sizeof(struct f2fs_acl_entry_short))
37 return -1;
38 return size / sizeof(struct f2fs_acl_entry_short);
39 } else {
40 if (s % sizeof(struct f2fs_acl_entry))
41 return -1;
42 return s / sizeof(struct f2fs_acl_entry) + 4;
43 }
44}
45
46static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
47{
48 int i, count;
49 struct posix_acl *acl;
50 struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
51 struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
52 const char *end = value + size;
53
54 if (size < sizeof(struct f2fs_acl_header))
55 return ERR_PTR(-EINVAL);
56
57 if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
58 return ERR_PTR(-EINVAL);
59
60 count = f2fs_acl_count(size);
61 if (count < 0)
62 return ERR_PTR(-EINVAL);
63 if (count == 0)
64 return NULL;
65
66 acl = posix_acl_alloc(count, GFP_NOFS);
67 if (!acl)
68 return ERR_PTR(-ENOMEM);
69
70 for (i = 0; i < count; i++) {
71
72 if ((char *)entry > end)
73 goto fail;
74
75 acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
76 acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
77
78 switch (acl->a_entries[i].e_tag) {
79 case ACL_USER_OBJ:
80 case ACL_GROUP_OBJ:
81 case ACL_MASK:
82 case ACL_OTHER:
83 entry = (struct f2fs_acl_entry *)((char *)entry +
84 sizeof(struct f2fs_acl_entry_short));
85 break;
86
87 case ACL_USER:
88 acl->a_entries[i].e_uid =
89 make_kuid(&init_user_ns,
90 le32_to_cpu(entry->e_id));
91 entry = (struct f2fs_acl_entry *)((char *)entry +
92 sizeof(struct f2fs_acl_entry));
93 break;
94 case ACL_GROUP:
95 acl->a_entries[i].e_gid =
96 make_kgid(&init_user_ns,
97 le32_to_cpu(entry->e_id));
98 entry = (struct f2fs_acl_entry *)((char *)entry +
99 sizeof(struct f2fs_acl_entry));
100 break;
101 default:
102 goto fail;
103 }
104 }
105 if ((char *)entry != end)
106 goto fail;
107 return acl;
108fail:
109 posix_acl_release(acl);
110 return ERR_PTR(-EINVAL);
111}
112
113static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
114 const struct posix_acl *acl, size_t *size)
115{
116 struct f2fs_acl_header *f2fs_acl;
117 struct f2fs_acl_entry *entry;
118 int i;
119
120 f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
121 acl->a_count * sizeof(struct f2fs_acl_entry),
122 GFP_NOFS);
123 if (!f2fs_acl)
124 return ERR_PTR(-ENOMEM);
125
126 f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
127 entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
128
129 for (i = 0; i < acl->a_count; i++) {
130
131 entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
132 entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
133
134 switch (acl->a_entries[i].e_tag) {
135 case ACL_USER:
136 entry->e_id = cpu_to_le32(
137 from_kuid(&init_user_ns,
138 acl->a_entries[i].e_uid));
139 entry = (struct f2fs_acl_entry *)((char *)entry +
140 sizeof(struct f2fs_acl_entry));
141 break;
142 case ACL_GROUP:
143 entry->e_id = cpu_to_le32(
144 from_kgid(&init_user_ns,
145 acl->a_entries[i].e_gid));
146 entry = (struct f2fs_acl_entry *)((char *)entry +
147 sizeof(struct f2fs_acl_entry));
148 break;
149 case ACL_USER_OBJ:
150 case ACL_GROUP_OBJ:
151 case ACL_MASK:
152 case ACL_OTHER:
153 entry = (struct f2fs_acl_entry *)((char *)entry +
154 sizeof(struct f2fs_acl_entry_short));
155 break;
156 default:
157 goto fail;
158 }
159 }
160 *size = f2fs_acl_size(acl->a_count);
161 return (void *)f2fs_acl;
162
163fail:
164 kfree(f2fs_acl);
165 return ERR_PTR(-EINVAL);
166}
167
168static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
169 struct page *dpage)
170{
171 int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
172 void *value = NULL;
173 struct posix_acl *acl;
174 int retval;
175
176 if (type == ACL_TYPE_ACCESS)
177 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
178
179 retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
180 if (retval > 0) {
181 value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
182 if (!value)
183 return ERR_PTR(-ENOMEM);
184 retval = f2fs_getxattr(inode, name_index, "", value,
185 retval, dpage);
186 }
187
188 if (retval > 0)
189 acl = f2fs_acl_from_disk(value, retval);
190 else if (retval == -ENODATA)
191 acl = NULL;
192 else
193 acl = ERR_PTR(retval);
194 kfree(value);
195
196 return acl;
197}
198
199struct posix_acl *f2fs_get_acl(struct inode *inode, int type, bool rcu)
200{
201 if (rcu)
202 return ERR_PTR(-ECHILD);
203
204 return __f2fs_get_acl(inode, type, NULL);
205}
206
207static int f2fs_acl_update_mode(struct mnt_idmap *idmap,
208 struct inode *inode, umode_t *mode_p,
209 struct posix_acl **acl)
210{
211 umode_t mode = inode->i_mode;
212 int error;
213
214 if (is_inode_flag_set(inode, FI_ACL_MODE))
215 mode = F2FS_I(inode)->i_acl_mode;
216
217 error = posix_acl_equiv_mode(*acl, &mode);
218 if (error < 0)
219 return error;
220 if (error == 0)
221 *acl = NULL;
222 if (!vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)) &&
223 !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
224 mode &= ~S_ISGID;
225 *mode_p = mode;
226 return 0;
227}
228
229static int __f2fs_set_acl(struct mnt_idmap *idmap,
230 struct inode *inode, int type,
231 struct posix_acl *acl, struct page *ipage)
232{
233 int name_index;
234 void *value = NULL;
235 size_t size = 0;
236 int error;
237 umode_t mode = inode->i_mode;
238
239 switch (type) {
240 case ACL_TYPE_ACCESS:
241 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
242 if (acl && !ipage) {
243 error = f2fs_acl_update_mode(idmap, inode,
244 &mode, &acl);
245 if (error)
246 return error;
247 set_acl_inode(inode, mode);
248 }
249 break;
250
251 case ACL_TYPE_DEFAULT:
252 name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
253 if (!S_ISDIR(inode->i_mode))
254 return acl ? -EACCES : 0;
255 break;
256
257 default:
258 return -EINVAL;
259 }
260
261 if (acl) {
262 value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
263 if (IS_ERR(value)) {
264 clear_inode_flag(inode, FI_ACL_MODE);
265 return PTR_ERR(value);
266 }
267 }
268
269 error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
270
271 kfree(value);
272 if (!error)
273 set_cached_acl(inode, type, acl);
274
275 clear_inode_flag(inode, FI_ACL_MODE);
276 return error;
277}
278
279int f2fs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
280 struct posix_acl *acl, int type)
281{
282 struct inode *inode = d_inode(dentry);
283
284 if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
285 return -EIO;
286
287 return __f2fs_set_acl(idmap, inode, type, acl, NULL);
288}
289
290/*
291 * Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
292 * are copied from posix_acl.c
293 */
294static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
295 gfp_t flags)
296{
297 struct posix_acl *clone = NULL;
298
299 if (acl) {
300 int size = sizeof(struct posix_acl) + acl->a_count *
301 sizeof(struct posix_acl_entry);
302 clone = kmemdup(acl, size, flags);
303 if (clone)
304 refcount_set(&clone->a_refcount, 1);
305 }
306 return clone;
307}
308
309static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
310{
311 struct posix_acl_entry *pa, *pe;
312 struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
313 umode_t mode = *mode_p;
314 int not_equiv = 0;
315
316 /* assert(atomic_read(acl->a_refcount) == 1); */
317
318 FOREACH_ACL_ENTRY(pa, acl, pe) {
319 switch (pa->e_tag) {
320 case ACL_USER_OBJ:
321 pa->e_perm &= (mode >> 6) | ~S_IRWXO;
322 mode &= (pa->e_perm << 6) | ~S_IRWXU;
323 break;
324
325 case ACL_USER:
326 case ACL_GROUP:
327 not_equiv = 1;
328 break;
329
330 case ACL_GROUP_OBJ:
331 group_obj = pa;
332 break;
333
334 case ACL_OTHER:
335 pa->e_perm &= mode | ~S_IRWXO;
336 mode &= pa->e_perm | ~S_IRWXO;
337 break;
338
339 case ACL_MASK:
340 mask_obj = pa;
341 not_equiv = 1;
342 break;
343
344 default:
345 return -EIO;
346 }
347 }
348
349 if (mask_obj) {
350 mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
351 mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
352 } else {
353 if (!group_obj)
354 return -EIO;
355 group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
356 mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
357 }
358
359 *mode_p = (*mode_p & ~S_IRWXUGO) | mode;
360 return not_equiv;
361}
362
363static int f2fs_acl_create(struct inode *dir, umode_t *mode,
364 struct posix_acl **default_acl, struct posix_acl **acl,
365 struct page *dpage)
366{
367 struct posix_acl *p;
368 struct posix_acl *clone;
369 int ret;
370
371 *acl = NULL;
372 *default_acl = NULL;
373
374 if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
375 return 0;
376
377 p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
378 if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
379 *mode &= ~current_umask();
380 return 0;
381 }
382 if (IS_ERR(p))
383 return PTR_ERR(p);
384
385 clone = f2fs_acl_clone(p, GFP_NOFS);
386 if (!clone) {
387 ret = -ENOMEM;
388 goto release_acl;
389 }
390
391 ret = f2fs_acl_create_masq(clone, mode);
392 if (ret < 0)
393 goto release_clone;
394
395 if (ret == 0)
396 posix_acl_release(clone);
397 else
398 *acl = clone;
399
400 if (!S_ISDIR(*mode))
401 posix_acl_release(p);
402 else
403 *default_acl = p;
404
405 return 0;
406
407release_clone:
408 posix_acl_release(clone);
409release_acl:
410 posix_acl_release(p);
411 return ret;
412}
413
414int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
415 struct page *dpage)
416{
417 struct posix_acl *default_acl = NULL, *acl = NULL;
418 int error;
419
420 error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
421 if (error)
422 return error;
423
424 f2fs_mark_inode_dirty_sync(inode, true);
425
426 if (default_acl) {
427 error = __f2fs_set_acl(NULL, inode, ACL_TYPE_DEFAULT, default_acl,
428 ipage);
429 posix_acl_release(default_acl);
430 } else {
431 inode->i_default_acl = NULL;
432 }
433 if (acl) {
434 if (!error)
435 error = __f2fs_set_acl(NULL, inode, ACL_TYPE_ACCESS, acl,
436 ipage);
437 posix_acl_release(acl);
438 } else {
439 inode->i_acl = NULL;
440 }
441
442 return error;
443}
1/*
2 * fs/f2fs/acl.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Portions of this code from linux/fs/ext2/acl.c
8 *
9 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15#include <linux/f2fs_fs.h>
16#include "f2fs.h"
17#include "xattr.h"
18#include "acl.h"
19
20static inline size_t f2fs_acl_size(int count)
21{
22 if (count <= 4) {
23 return sizeof(struct f2fs_acl_header) +
24 count * sizeof(struct f2fs_acl_entry_short);
25 } else {
26 return sizeof(struct f2fs_acl_header) +
27 4 * sizeof(struct f2fs_acl_entry_short) +
28 (count - 4) * sizeof(struct f2fs_acl_entry);
29 }
30}
31
32static inline int f2fs_acl_count(size_t size)
33{
34 ssize_t s;
35 size -= sizeof(struct f2fs_acl_header);
36 s = size - 4 * sizeof(struct f2fs_acl_entry_short);
37 if (s < 0) {
38 if (size % sizeof(struct f2fs_acl_entry_short))
39 return -1;
40 return size / sizeof(struct f2fs_acl_entry_short);
41 } else {
42 if (s % sizeof(struct f2fs_acl_entry))
43 return -1;
44 return s / sizeof(struct f2fs_acl_entry) + 4;
45 }
46}
47
48static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
49{
50 int i, count;
51 struct posix_acl *acl;
52 struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
53 struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
54 const char *end = value + size;
55
56 if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
57 return ERR_PTR(-EINVAL);
58
59 count = f2fs_acl_count(size);
60 if (count < 0)
61 return ERR_PTR(-EINVAL);
62 if (count == 0)
63 return NULL;
64
65 acl = posix_acl_alloc(count, GFP_NOFS);
66 if (!acl)
67 return ERR_PTR(-ENOMEM);
68
69 for (i = 0; i < count; i++) {
70
71 if ((char *)entry > end)
72 goto fail;
73
74 acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
75 acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
76
77 switch (acl->a_entries[i].e_tag) {
78 case ACL_USER_OBJ:
79 case ACL_GROUP_OBJ:
80 case ACL_MASK:
81 case ACL_OTHER:
82 entry = (struct f2fs_acl_entry *)((char *)entry +
83 sizeof(struct f2fs_acl_entry_short));
84 break;
85
86 case ACL_USER:
87 acl->a_entries[i].e_uid =
88 make_kuid(&init_user_ns,
89 le32_to_cpu(entry->e_id));
90 entry = (struct f2fs_acl_entry *)((char *)entry +
91 sizeof(struct f2fs_acl_entry));
92 break;
93 case ACL_GROUP:
94 acl->a_entries[i].e_gid =
95 make_kgid(&init_user_ns,
96 le32_to_cpu(entry->e_id));
97 entry = (struct f2fs_acl_entry *)((char *)entry +
98 sizeof(struct f2fs_acl_entry));
99 break;
100 default:
101 goto fail;
102 }
103 }
104 if ((char *)entry != end)
105 goto fail;
106 return acl;
107fail:
108 posix_acl_release(acl);
109 return ERR_PTR(-EINVAL);
110}
111
112static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
113 const struct posix_acl *acl, size_t *size)
114{
115 struct f2fs_acl_header *f2fs_acl;
116 struct f2fs_acl_entry *entry;
117 int i;
118
119 f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
120 acl->a_count * sizeof(struct f2fs_acl_entry),
121 GFP_NOFS);
122 if (!f2fs_acl)
123 return ERR_PTR(-ENOMEM);
124
125 f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
126 entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
127
128 for (i = 0; i < acl->a_count; i++) {
129
130 entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
131 entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
132
133 switch (acl->a_entries[i].e_tag) {
134 case ACL_USER:
135 entry->e_id = cpu_to_le32(
136 from_kuid(&init_user_ns,
137 acl->a_entries[i].e_uid));
138 entry = (struct f2fs_acl_entry *)((char *)entry +
139 sizeof(struct f2fs_acl_entry));
140 break;
141 case ACL_GROUP:
142 entry->e_id = cpu_to_le32(
143 from_kgid(&init_user_ns,
144 acl->a_entries[i].e_gid));
145 entry = (struct f2fs_acl_entry *)((char *)entry +
146 sizeof(struct f2fs_acl_entry));
147 break;
148 case ACL_USER_OBJ:
149 case ACL_GROUP_OBJ:
150 case ACL_MASK:
151 case ACL_OTHER:
152 entry = (struct f2fs_acl_entry *)((char *)entry +
153 sizeof(struct f2fs_acl_entry_short));
154 break;
155 default:
156 goto fail;
157 }
158 }
159 *size = f2fs_acl_size(acl->a_count);
160 return (void *)f2fs_acl;
161
162fail:
163 kfree(f2fs_acl);
164 return ERR_PTR(-EINVAL);
165}
166
167static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
168 struct page *dpage)
169{
170 int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
171 void *value = NULL;
172 struct posix_acl *acl;
173 int retval;
174
175 if (type == ACL_TYPE_ACCESS)
176 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
177
178 retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
179 if (retval > 0) {
180 value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
181 if (!value)
182 return ERR_PTR(-ENOMEM);
183 retval = f2fs_getxattr(inode, name_index, "", value,
184 retval, dpage);
185 }
186
187 if (retval > 0)
188 acl = f2fs_acl_from_disk(value, retval);
189 else if (retval == -ENODATA)
190 acl = NULL;
191 else
192 acl = ERR_PTR(retval);
193 kfree(value);
194
195 return acl;
196}
197
198struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
199{
200 return __f2fs_get_acl(inode, type, NULL);
201}
202
203static int __f2fs_set_acl(struct inode *inode, int type,
204 struct posix_acl *acl, struct page *ipage)
205{
206 int name_index;
207 void *value = NULL;
208 size_t size = 0;
209 int error;
210 umode_t mode = inode->i_mode;
211
212 switch (type) {
213 case ACL_TYPE_ACCESS:
214 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
215 if (acl && !ipage) {
216 error = posix_acl_update_mode(inode, &mode, &acl);
217 if (error)
218 return error;
219 set_acl_inode(inode, mode);
220 }
221 break;
222
223 case ACL_TYPE_DEFAULT:
224 name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
225 if (!S_ISDIR(inode->i_mode))
226 return acl ? -EACCES : 0;
227 break;
228
229 default:
230 return -EINVAL;
231 }
232
233 if (acl) {
234 value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
235 if (IS_ERR(value)) {
236 clear_inode_flag(inode, FI_ACL_MODE);
237 return PTR_ERR(value);
238 }
239 }
240
241 error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
242
243 kfree(value);
244 if (!error)
245 set_cached_acl(inode, type, acl);
246
247 clear_inode_flag(inode, FI_ACL_MODE);
248 return error;
249}
250
251int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
252{
253 if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
254 return -EIO;
255
256 return __f2fs_set_acl(inode, type, acl, NULL);
257}
258
259/*
260 * Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
261 * are copied from posix_acl.c
262 */
263static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
264 gfp_t flags)
265{
266 struct posix_acl *clone = NULL;
267
268 if (acl) {
269 int size = sizeof(struct posix_acl) + acl->a_count *
270 sizeof(struct posix_acl_entry);
271 clone = kmemdup(acl, size, flags);
272 if (clone)
273 refcount_set(&clone->a_refcount, 1);
274 }
275 return clone;
276}
277
278static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
279{
280 struct posix_acl_entry *pa, *pe;
281 struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
282 umode_t mode = *mode_p;
283 int not_equiv = 0;
284
285 /* assert(atomic_read(acl->a_refcount) == 1); */
286
287 FOREACH_ACL_ENTRY(pa, acl, pe) {
288 switch(pa->e_tag) {
289 case ACL_USER_OBJ:
290 pa->e_perm &= (mode >> 6) | ~S_IRWXO;
291 mode &= (pa->e_perm << 6) | ~S_IRWXU;
292 break;
293
294 case ACL_USER:
295 case ACL_GROUP:
296 not_equiv = 1;
297 break;
298
299 case ACL_GROUP_OBJ:
300 group_obj = pa;
301 break;
302
303 case ACL_OTHER:
304 pa->e_perm &= mode | ~S_IRWXO;
305 mode &= pa->e_perm | ~S_IRWXO;
306 break;
307
308 case ACL_MASK:
309 mask_obj = pa;
310 not_equiv = 1;
311 break;
312
313 default:
314 return -EIO;
315 }
316 }
317
318 if (mask_obj) {
319 mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
320 mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
321 } else {
322 if (!group_obj)
323 return -EIO;
324 group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
325 mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
326 }
327
328 *mode_p = (*mode_p & ~S_IRWXUGO) | mode;
329 return not_equiv;
330}
331
332static int f2fs_acl_create(struct inode *dir, umode_t *mode,
333 struct posix_acl **default_acl, struct posix_acl **acl,
334 struct page *dpage)
335{
336 struct posix_acl *p;
337 struct posix_acl *clone;
338 int ret;
339
340 *acl = NULL;
341 *default_acl = NULL;
342
343 if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
344 return 0;
345
346 p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
347 if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
348 *mode &= ~current_umask();
349 return 0;
350 }
351 if (IS_ERR(p))
352 return PTR_ERR(p);
353
354 clone = f2fs_acl_clone(p, GFP_NOFS);
355 if (!clone)
356 goto no_mem;
357
358 ret = f2fs_acl_create_masq(clone, mode);
359 if (ret < 0)
360 goto no_mem_clone;
361
362 if (ret == 0)
363 posix_acl_release(clone);
364 else
365 *acl = clone;
366
367 if (!S_ISDIR(*mode))
368 posix_acl_release(p);
369 else
370 *default_acl = p;
371
372 return 0;
373
374no_mem_clone:
375 posix_acl_release(clone);
376no_mem:
377 posix_acl_release(p);
378 return -ENOMEM;
379}
380
381int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
382 struct page *dpage)
383{
384 struct posix_acl *default_acl = NULL, *acl = NULL;
385 int error = 0;
386
387 error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
388 if (error)
389 return error;
390
391 f2fs_mark_inode_dirty_sync(inode, true);
392
393 if (default_acl) {
394 error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl,
395 ipage);
396 posix_acl_release(default_acl);
397 }
398 if (acl) {
399 if (!error)
400 error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl,
401 ipage);
402 posix_acl_release(acl);
403 }
404
405 return error;
406}