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af48b85b JK |
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 | ||
20 | #define get_inode_mode(i) ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \ | |
21 | (F2FS_I(i)->i_acl_mode) : ((i)->i_mode)) | |
22 | ||
23 | static inline size_t f2fs_acl_size(int count) | |
24 | { | |
25 | if (count <= 4) { | |
26 | return sizeof(struct f2fs_acl_header) + | |
27 | count * sizeof(struct f2fs_acl_entry_short); | |
28 | } else { | |
29 | return sizeof(struct f2fs_acl_header) + | |
30 | 4 * sizeof(struct f2fs_acl_entry_short) + | |
31 | (count - 4) * sizeof(struct f2fs_acl_entry); | |
32 | } | |
33 | } | |
34 | ||
35 | static inline int f2fs_acl_count(size_t size) | |
36 | { | |
37 | ssize_t s; | |
38 | size -= sizeof(struct f2fs_acl_header); | |
39 | s = size - 4 * sizeof(struct f2fs_acl_entry_short); | |
40 | if (s < 0) { | |
41 | if (size % sizeof(struct f2fs_acl_entry_short)) | |
42 | return -1; | |
43 | return size / sizeof(struct f2fs_acl_entry_short); | |
44 | } else { | |
45 | if (s % sizeof(struct f2fs_acl_entry)) | |
46 | return -1; | |
47 | return s / sizeof(struct f2fs_acl_entry) + 4; | |
48 | } | |
49 | } | |
50 | ||
51 | static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size) | |
52 | { | |
53 | int i, count; | |
54 | struct posix_acl *acl; | |
55 | struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value; | |
56 | struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1); | |
57 | const char *end = value + size; | |
58 | ||
59 | if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION)) | |
60 | return ERR_PTR(-EINVAL); | |
61 | ||
62 | count = f2fs_acl_count(size); | |
63 | if (count < 0) | |
64 | return ERR_PTR(-EINVAL); | |
65 | if (count == 0) | |
66 | return NULL; | |
67 | ||
68 | acl = posix_acl_alloc(count, GFP_KERNEL); | |
69 | if (!acl) | |
70 | return ERR_PTR(-ENOMEM); | |
71 | ||
72 | for (i = 0; i < count; i++) { | |
73 | ||
74 | if ((char *)entry > end) | |
75 | goto fail; | |
76 | ||
77 | acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag); | |
78 | acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm); | |
79 | ||
80 | switch (acl->a_entries[i].e_tag) { | |
81 | case ACL_USER_OBJ: | |
82 | case ACL_GROUP_OBJ: | |
83 | case ACL_MASK: | |
84 | case ACL_OTHER: | |
85 | acl->a_entries[i].e_id = ACL_UNDEFINED_ID; | |
86 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
87 | sizeof(struct f2fs_acl_entry_short)); | |
88 | break; | |
89 | ||
90 | case ACL_USER: | |
91 | acl->a_entries[i].e_uid = | |
92 | make_kuid(&init_user_ns, | |
93 | le32_to_cpu(entry->e_id)); | |
94 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
95 | sizeof(struct f2fs_acl_entry)); | |
96 | break; | |
97 | case ACL_GROUP: | |
98 | acl->a_entries[i].e_gid = | |
99 | make_kgid(&init_user_ns, | |
100 | le32_to_cpu(entry->e_id)); | |
101 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
102 | sizeof(struct f2fs_acl_entry)); | |
103 | break; | |
104 | default: | |
105 | goto fail; | |
106 | } | |
107 | } | |
108 | if ((char *)entry != end) | |
109 | goto fail; | |
110 | return acl; | |
111 | fail: | |
112 | posix_acl_release(acl); | |
113 | return ERR_PTR(-EINVAL); | |
114 | } | |
115 | ||
116 | static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size) | |
117 | { | |
118 | struct f2fs_acl_header *f2fs_acl; | |
119 | struct f2fs_acl_entry *entry; | |
120 | int i; | |
121 | ||
122 | f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count * | |
123 | sizeof(struct f2fs_acl_entry), GFP_KERNEL); | |
124 | if (!f2fs_acl) | |
125 | return ERR_PTR(-ENOMEM); | |
126 | ||
127 | f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION); | |
128 | entry = (struct f2fs_acl_entry *)(f2fs_acl + 1); | |
129 | ||
130 | for (i = 0; i < acl->a_count; i++) { | |
131 | ||
132 | entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag); | |
133 | entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm); | |
134 | ||
135 | switch (acl->a_entries[i].e_tag) { | |
136 | case ACL_USER: | |
137 | entry->e_id = cpu_to_le32( | |
138 | from_kuid(&init_user_ns, | |
139 | acl->a_entries[i].e_uid)); | |
140 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
141 | sizeof(struct f2fs_acl_entry)); | |
142 | break; | |
143 | case ACL_GROUP: | |
144 | entry->e_id = cpu_to_le32( | |
145 | from_kgid(&init_user_ns, | |
146 | acl->a_entries[i].e_gid)); | |
147 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
148 | sizeof(struct f2fs_acl_entry)); | |
149 | break; | |
150 | case ACL_USER_OBJ: | |
151 | case ACL_GROUP_OBJ: | |
152 | case ACL_MASK: | |
153 | case ACL_OTHER: | |
154 | entry = (struct f2fs_acl_entry *)((char *)entry + | |
155 | sizeof(struct f2fs_acl_entry_short)); | |
156 | break; | |
157 | default: | |
158 | goto fail; | |
159 | } | |
160 | } | |
161 | *size = f2fs_acl_size(acl->a_count); | |
162 | return (void *)f2fs_acl; | |
163 | ||
164 | fail: | |
165 | kfree(f2fs_acl); | |
166 | return ERR_PTR(-EINVAL); | |
167 | } | |
168 | ||
169 | struct posix_acl *f2fs_get_acl(struct inode *inode, int type) | |
170 | { | |
171 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
172 | int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
173 | void *value = NULL; | |
174 | struct posix_acl *acl; | |
175 | int retval; | |
176 | ||
177 | if (!test_opt(sbi, POSIX_ACL)) | |
178 | return NULL; | |
179 | ||
180 | acl = get_cached_acl(inode, type); | |
181 | if (acl != ACL_NOT_CACHED) | |
182 | return acl; | |
183 | ||
184 | if (type == ACL_TYPE_ACCESS) | |
185 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; | |
186 | ||
187 | retval = f2fs_getxattr(inode, name_index, "", NULL, 0); | |
188 | if (retval > 0) { | |
189 | value = kmalloc(retval, GFP_KERNEL); | |
190 | if (!value) | |
191 | return ERR_PTR(-ENOMEM); | |
192 | retval = f2fs_getxattr(inode, name_index, "", value, retval); | |
193 | } | |
194 | ||
195 | if (retval < 0) { | |
196 | if (retval == -ENODATA) | |
197 | acl = NULL; | |
198 | else | |
199 | acl = ERR_PTR(retval); | |
200 | } else { | |
201 | acl = f2fs_acl_from_disk(value, retval); | |
202 | } | |
203 | kfree(value); | |
204 | if (!IS_ERR(acl)) | |
205 | set_cached_acl(inode, type, acl); | |
206 | ||
207 | return acl; | |
208 | } | |
209 | ||
210 | static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl) | |
211 | { | |
212 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
213 | struct f2fs_inode_info *fi = F2FS_I(inode); | |
214 | int name_index; | |
215 | void *value = NULL; | |
216 | size_t size = 0; | |
217 | int error; | |
218 | ||
219 | if (!test_opt(sbi, POSIX_ACL)) | |
220 | return 0; | |
221 | if (S_ISLNK(inode->i_mode)) | |
222 | return -EOPNOTSUPP; | |
223 | ||
224 | switch (type) { | |
225 | case ACL_TYPE_ACCESS: | |
226 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; | |
227 | if (acl) { | |
228 | error = posix_acl_equiv_mode(acl, &inode->i_mode); | |
229 | if (error < 0) | |
230 | return error; | |
231 | set_acl_inode(fi, inode->i_mode); | |
232 | if (error == 0) | |
233 | acl = NULL; | |
234 | } | |
235 | break; | |
236 | ||
237 | case ACL_TYPE_DEFAULT: | |
238 | name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
239 | if (!S_ISDIR(inode->i_mode)) | |
240 | return acl ? -EACCES : 0; | |
241 | break; | |
242 | ||
243 | default: | |
244 | return -EINVAL; | |
245 | } | |
246 | ||
247 | if (acl) { | |
248 | value = f2fs_acl_to_disk(acl, &size); | |
249 | if (IS_ERR(value)) { | |
250 | cond_clear_inode_flag(fi, FI_ACL_MODE); | |
251 | return (int)PTR_ERR(value); | |
252 | } | |
253 | } | |
254 | ||
255 | error = f2fs_setxattr(inode, name_index, "", value, size); | |
256 | ||
257 | kfree(value); | |
258 | if (!error) | |
259 | set_cached_acl(inode, type, acl); | |
260 | ||
261 | cond_clear_inode_flag(fi, FI_ACL_MODE); | |
262 | return error; | |
263 | } | |
264 | ||
265 | int f2fs_init_acl(struct inode *inode, struct inode *dir) | |
266 | { | |
267 | struct posix_acl *acl = NULL; | |
268 | struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb); | |
269 | int error = 0; | |
270 | ||
271 | if (!S_ISLNK(inode->i_mode)) { | |
272 | if (test_opt(sbi, POSIX_ACL)) { | |
273 | acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT); | |
274 | if (IS_ERR(acl)) | |
275 | return PTR_ERR(acl); | |
276 | } | |
277 | if (!acl) | |
278 | inode->i_mode &= ~current_umask(); | |
279 | } | |
280 | ||
281 | if (test_opt(sbi, POSIX_ACL) && acl) { | |
282 | ||
283 | if (S_ISDIR(inode->i_mode)) { | |
284 | error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl); | |
285 | if (error) | |
286 | goto cleanup; | |
287 | } | |
288 | error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode); | |
289 | if (error < 0) | |
290 | return error; | |
291 | if (error > 0) | |
292 | error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl); | |
293 | } | |
294 | cleanup: | |
295 | posix_acl_release(acl); | |
296 | return error; | |
297 | } | |
298 | ||
299 | int f2fs_acl_chmod(struct inode *inode) | |
300 | { | |
301 | struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); | |
302 | struct posix_acl *acl; | |
303 | int error; | |
304 | mode_t mode = get_inode_mode(inode); | |
305 | ||
306 | if (!test_opt(sbi, POSIX_ACL)) | |
307 | return 0; | |
308 | if (S_ISLNK(mode)) | |
309 | return -EOPNOTSUPP; | |
310 | ||
311 | acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS); | |
312 | if (IS_ERR(acl) || !acl) | |
313 | return PTR_ERR(acl); | |
314 | ||
315 | error = posix_acl_chmod(&acl, GFP_KERNEL, mode); | |
316 | if (error) | |
317 | return error; | |
318 | error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl); | |
319 | posix_acl_release(acl); | |
320 | return error; | |
321 | } | |
322 | ||
323 | static size_t f2fs_xattr_list_acl(struct dentry *dentry, char *list, | |
324 | size_t list_size, const char *name, size_t name_len, int type) | |
325 | { | |
326 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
327 | const char *xname = POSIX_ACL_XATTR_DEFAULT; | |
328 | size_t size; | |
329 | ||
330 | if (!test_opt(sbi, POSIX_ACL)) | |
331 | return 0; | |
332 | ||
333 | if (type == ACL_TYPE_ACCESS) | |
334 | xname = POSIX_ACL_XATTR_ACCESS; | |
335 | ||
336 | size = strlen(xname) + 1; | |
337 | if (list && size <= list_size) | |
338 | memcpy(list, xname, size); | |
339 | return size; | |
340 | } | |
341 | ||
342 | static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name, | |
343 | void *buffer, size_t size, int type) | |
344 | { | |
345 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
346 | struct posix_acl *acl; | |
347 | int error; | |
348 | ||
349 | if (strcmp(name, "") != 0) | |
350 | return -EINVAL; | |
351 | if (!test_opt(sbi, POSIX_ACL)) | |
352 | return -EOPNOTSUPP; | |
353 | ||
354 | acl = f2fs_get_acl(dentry->d_inode, type); | |
355 | if (IS_ERR(acl)) | |
356 | return PTR_ERR(acl); | |
357 | if (!acl) | |
358 | return -ENODATA; | |
359 | error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
360 | posix_acl_release(acl); | |
361 | ||
362 | return error; | |
363 | } | |
364 | ||
365 | static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name, | |
366 | const void *value, size_t size, int flags, int type) | |
367 | { | |
368 | struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); | |
369 | struct inode *inode = dentry->d_inode; | |
370 | struct posix_acl *acl = NULL; | |
371 | int error; | |
372 | ||
373 | if (strcmp(name, "") != 0) | |
374 | return -EINVAL; | |
375 | if (!test_opt(sbi, POSIX_ACL)) | |
376 | return -EOPNOTSUPP; | |
377 | if (!inode_owner_or_capable(inode)) | |
378 | return -EPERM; | |
379 | ||
380 | if (value) { | |
381 | acl = posix_acl_from_xattr(&init_user_ns, value, size); | |
382 | if (IS_ERR(acl)) | |
383 | return PTR_ERR(acl); | |
384 | if (acl) { | |
385 | error = posix_acl_valid(acl); | |
386 | if (error) | |
387 | goto release_and_out; | |
388 | } | |
389 | } else { | |
390 | acl = NULL; | |
391 | } | |
392 | ||
393 | error = f2fs_set_acl(inode, type, acl); | |
394 | ||
395 | release_and_out: | |
396 | posix_acl_release(acl); | |
397 | return error; | |
398 | } | |
399 | ||
400 | const struct xattr_handler f2fs_xattr_acl_default_handler = { | |
401 | .prefix = POSIX_ACL_XATTR_DEFAULT, | |
402 | .flags = ACL_TYPE_DEFAULT, | |
403 | .list = f2fs_xattr_list_acl, | |
404 | .get = f2fs_xattr_get_acl, | |
405 | .set = f2fs_xattr_set_acl, | |
406 | }; | |
407 | ||
408 | const struct xattr_handler f2fs_xattr_acl_access_handler = { | |
409 | .prefix = POSIX_ACL_XATTR_ACCESS, | |
410 | .flags = ACL_TYPE_ACCESS, | |
411 | .list = f2fs_xattr_list_acl, | |
412 | .get = f2fs_xattr_get_acl, | |
413 | .set = f2fs_xattr_set_acl, | |
414 | }; | |
415 | ||
416 | static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list, | |
417 | size_t list_size, const char *name, size_t name_len, int type) | |
418 | { | |
419 | const char *xname = F2FS_SYSTEM_ADVISE_PREFIX; | |
420 | size_t size; | |
421 | ||
422 | if (type != F2FS_XATTR_INDEX_ADVISE) | |
423 | return 0; | |
424 | ||
425 | size = strlen(xname) + 1; | |
426 | if (list && size <= list_size) | |
427 | memcpy(list, xname, size); | |
428 | return size; | |
429 | } | |
430 | ||
431 | static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name, | |
432 | void *buffer, size_t size, int type) | |
433 | { | |
434 | struct inode *inode = dentry->d_inode; | |
435 | ||
436 | if (strcmp(name, "") != 0) | |
437 | return -EINVAL; | |
438 | ||
439 | *((char *)buffer) = F2FS_I(inode)->i_advise; | |
440 | return sizeof(char); | |
441 | } | |
442 | ||
443 | static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name, | |
444 | const void *value, size_t size, int flags, int type) | |
445 | { | |
446 | struct inode *inode = dentry->d_inode; | |
447 | ||
448 | if (strcmp(name, "") != 0) | |
449 | return -EINVAL; | |
450 | if (!inode_owner_or_capable(inode)) | |
451 | return -EPERM; | |
452 | if (value == NULL) | |
453 | return -EINVAL; | |
454 | ||
455 | F2FS_I(inode)->i_advise |= *(char *)value; | |
456 | return 0; | |
457 | } | |
458 | ||
459 | const struct xattr_handler f2fs_xattr_advise_handler = { | |
460 | .prefix = F2FS_SYSTEM_ADVISE_PREFIX, | |
461 | .flags = F2FS_XATTR_INDEX_ADVISE, | |
462 | .list = f2fs_xattr_advise_list, | |
463 | .get = f2fs_xattr_advise_get, | |
464 | .set = f2fs_xattr_advise_set, | |
465 | }; |