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0a8165d7 1/*
af48b85b
JK
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
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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
dd802406 65 acl = posix_acl_alloc(count, GFP_NOFS);
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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:
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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
1ecc0c5c
CY
112static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi,
113 const struct posix_acl *acl, size_t *size)
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114{
115 struct f2fs_acl_header *f2fs_acl;
116 struct f2fs_acl_entry *entry;
117 int i;
118
1ecc0c5c
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119 f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) +
120 acl->a_count * sizeof(struct f2fs_acl_entry),
121 GFP_NOFS);
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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
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167static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type,
168 struct page *dpage)
af48b85b 169{
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170 int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
171 void *value = NULL;
172 struct posix_acl *acl;
173 int retval;
174
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175 if (type == ACL_TYPE_ACCESS)
176 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
177
bce8d112 178 retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage);
af48b85b 179 if (retval > 0) {
1ecc0c5c 180 value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO);
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181 if (!value)
182 return ERR_PTR(-ENOMEM);
bce8d112
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183 retval = f2fs_getxattr(inode, name_index, "", value,
184 retval, dpage);
af48b85b
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185 }
186
c1b75eab 187 if (retval > 0)
af48b85b 188 acl = f2fs_acl_from_disk(value, retval);
c1b75eab
JK
189 else if (retval == -ENODATA)
190 acl = NULL;
191 else
192 acl = ERR_PTR(retval);
af48b85b 193 kfree(value);
c1b75eab 194
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195 return acl;
196}
197
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198struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
199{
200 return __f2fs_get_acl(inode, type, NULL);
201}
202
a6dda0e6 203static int __f2fs_set_acl(struct inode *inode, int type,
2ed2d5b3 204 struct posix_acl *acl, struct page *ipage)
af48b85b 205{
af48b85b
JK
206 int name_index;
207 void *value = NULL;
208 size_t size = 0;
209 int error;
210
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211 switch (type) {
212 case ACL_TYPE_ACCESS:
213 name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
c925dc16 214 if (acl && !ipage) {
07393101
JK
215 error = posix_acl_update_mode(inode, &inode->i_mode, &acl);
216 if (error)
af48b85b 217 return error;
91942321 218 set_acl_inode(inode, inode->i_mode);
af48b85b
JK
219 }
220 break;
221
222 case ACL_TYPE_DEFAULT:
223 name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
224 if (!S_ISDIR(inode->i_mode))
225 return acl ? -EACCES : 0;
226 break;
227
228 default:
229 return -EINVAL;
230 }
231
232 if (acl) {
1ecc0c5c 233 value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size);
af48b85b 234 if (IS_ERR(value)) {
91942321 235 clear_inode_flag(inode, FI_ACL_MODE);
68390dd9 236 return PTR_ERR(value);
af48b85b
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237 }
238 }
239
c02745ef 240 error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0);
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241
242 kfree(value);
243 if (!error)
244 set_cached_acl(inode, type, acl);
245
91942321 246 clear_inode_flag(inode, FI_ACL_MODE);
af48b85b
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247 return error;
248}
249
a6dda0e6 250int f2fs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
af48b85b 251{
a6dda0e6 252 return __f2fs_set_acl(inode, type, acl, NULL);
af48b85b
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253}
254
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255/*
256 * Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create
257 * are copied from posix_acl.c
258 */
259static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
260 gfp_t flags)
261{
262 struct posix_acl *clone = NULL;
263
264 if (acl) {
265 int size = sizeof(struct posix_acl) + acl->a_count *
266 sizeof(struct posix_acl_entry);
267 clone = kmemdup(acl, size, flags);
268 if (clone)
269 atomic_set(&clone->a_refcount, 1);
270 }
271 return clone;
272}
273
274static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
275{
276 struct posix_acl_entry *pa, *pe;
277 struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
278 umode_t mode = *mode_p;
279 int not_equiv = 0;
280
281 /* assert(atomic_read(acl->a_refcount) == 1); */
282
283 FOREACH_ACL_ENTRY(pa, acl, pe) {
284 switch(pa->e_tag) {
285 case ACL_USER_OBJ:
286 pa->e_perm &= (mode >> 6) | ~S_IRWXO;
287 mode &= (pa->e_perm << 6) | ~S_IRWXU;
288 break;
289
290 case ACL_USER:
291 case ACL_GROUP:
292 not_equiv = 1;
293 break;
294
295 case ACL_GROUP_OBJ:
296 group_obj = pa;
297 break;
298
299 case ACL_OTHER:
300 pa->e_perm &= mode | ~S_IRWXO;
301 mode &= pa->e_perm | ~S_IRWXO;
302 break;
303
304 case ACL_MASK:
305 mask_obj = pa;
306 not_equiv = 1;
307 break;
308
309 default:
310 return -EIO;
311 }
312 }
313
314 if (mask_obj) {
315 mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
316 mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
317 } else {
318 if (!group_obj)
319 return -EIO;
320 group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
321 mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
322 }
323
324 *mode_p = (*mode_p & ~S_IRWXUGO) | mode;
325 return not_equiv;
326}
327
328static int f2fs_acl_create(struct inode *dir, umode_t *mode,
329 struct posix_acl **default_acl, struct posix_acl **acl,
330 struct page *dpage)
331{
332 struct posix_acl *p;
272e083f 333 struct posix_acl *clone;
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334 int ret;
335
272e083f
CY
336 *acl = NULL;
337 *default_acl = NULL;
338
bce8d112 339 if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
272e083f 340 return 0;
bce8d112
JK
341
342 p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage);
272e083f
CY
343 if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
344 *mode &= ~current_umask();
345 return 0;
bce8d112 346 }
272e083f
CY
347 if (IS_ERR(p))
348 return PTR_ERR(p);
bce8d112 349
272e083f
CY
350 clone = f2fs_acl_clone(p, GFP_NOFS);
351 if (!clone)
83dfe53c 352 goto no_mem;
bce8d112 353
272e083f 354 ret = f2fs_acl_create_masq(clone, mode);
83dfe53c
CY
355 if (ret < 0)
356 goto no_mem_clone;
bce8d112 357
272e083f
CY
358 if (ret == 0)
359 posix_acl_release(clone);
360 else
361 *acl = clone;
bce8d112 362
272e083f 363 if (!S_ISDIR(*mode))
bce8d112 364 posix_acl_release(p);
272e083f 365 else
bce8d112 366 *default_acl = p;
bce8d112 367
bce8d112 368 return 0;
83dfe53c
CY
369
370no_mem_clone:
272e083f 371 posix_acl_release(clone);
83dfe53c
CY
372no_mem:
373 posix_acl_release(p);
374 return -ENOMEM;
bce8d112
JK
375}
376
377int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage,
378 struct page *dpage)
af48b85b 379{
bce8d112 380 struct posix_acl *default_acl = NULL, *acl = NULL;
a6dda0e6 381 int error = 0;
af48b85b 382
bce8d112 383 error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage);
af48b85b
JK
384 if (error)
385 return error;
b8b60e1a 386
7c45729a 387 f2fs_mark_inode_dirty_sync(inode, true);
205b9822 388
a6dda0e6
CH
389 if (default_acl) {
390 error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl,
391 ipage);
392 posix_acl_release(default_acl);
393 }
394 if (acl) {
3b6709b7 395 if (!error)
a6dda0e6
CH
396 error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl,
397 ipage);
398 posix_acl_release(acl);
af48b85b
JK
399 }
400
af48b85b
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401 return error;
402}