Commit | Line | Data |
---|---|---|
16f7e0fe | 1 | #include <linux/capability.h> |
1da177e4 LT |
2 | #include <linux/fs.h> |
3 | #include <linux/posix_acl.h> | |
f466c6fd | 4 | #include "reiserfs.h" |
1da177e4 LT |
5 | #include <linux/errno.h> |
6 | #include <linux/pagemap.h> | |
7 | #include <linux/xattr.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
9a59f452 | 9 | #include <linux/posix_acl_xattr.h> |
c45ac888 | 10 | #include "xattr.h" |
a3063ab8 | 11 | #include "acl.h" |
17093991 | 12 | #include <linux/uaccess.h> |
1da177e4 | 13 | |
47f70d08 | 14 | static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th, |
0ab2621e | 15 | struct inode *inode, int type, |
bd4c625c | 16 | struct posix_acl *acl); |
1da177e4 | 17 | |
47f70d08 CH |
18 | |
19 | int | |
20 | reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
1da177e4 | 21 | { |
0ab2621e JM |
22 | int error, error2; |
23 | struct reiserfs_transaction_handle th; | |
24 | size_t jcreate_blocks; | |
47f70d08 CH |
25 | int size = acl ? posix_acl_xattr_size(acl->a_count) : 0; |
26 | ||
1da177e4 | 27 | |
098297b2 JM |
28 | /* |
29 | * Pessimism: We can't assume that anything from the xattr root up | |
30 | * has been created. | |
31 | */ | |
0ab2621e JM |
32 | |
33 | jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) + | |
34 | reiserfs_xattr_nblocks(inode, size) * 2; | |
35 | ||
36 | reiserfs_write_lock(inode->i_sb); | |
37 | error = journal_begin(&th, inode->i_sb, jcreate_blocks); | |
4c05141d | 38 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 39 | if (error == 0) { |
47f70d08 | 40 | error = __reiserfs_set_acl(&th, inode, type, acl); |
4c05141d | 41 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 42 | error2 = journal_end(&th); |
4c05141d | 43 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
44 | if (error2) |
45 | error = error2; | |
46 | } | |
1da177e4 | 47 | |
1da177e4 LT |
48 | return error; |
49 | } | |
50 | ||
1da177e4 LT |
51 | /* |
52 | * Convert from filesystem to in-memory representation. | |
53 | */ | |
9dad943a | 54 | static struct posix_acl *reiserfs_posix_acl_from_disk(const void *value, size_t size) |
1da177e4 LT |
55 | { |
56 | const char *end = (char *)value + size; | |
57 | int n, count; | |
58 | struct posix_acl *acl; | |
59 | ||
60 | if (!value) | |
61 | return NULL; | |
62 | if (size < sizeof(reiserfs_acl_header)) | |
bd4c625c LT |
63 | return ERR_PTR(-EINVAL); |
64 | if (((reiserfs_acl_header *) value)->a_version != | |
1da177e4 LT |
65 | cpu_to_le32(REISERFS_ACL_VERSION)) |
66 | return ERR_PTR(-EINVAL); | |
67 | value = (char *)value + sizeof(reiserfs_acl_header); | |
68 | count = reiserfs_acl_count(size); | |
69 | if (count < 0) | |
70 | return ERR_PTR(-EINVAL); | |
71 | if (count == 0) | |
72 | return NULL; | |
73 | acl = posix_acl_alloc(count, GFP_NOFS); | |
74 | if (!acl) | |
75 | return ERR_PTR(-ENOMEM); | |
bd4c625c LT |
76 | for (n = 0; n < count; n++) { |
77 | reiserfs_acl_entry *entry = (reiserfs_acl_entry *) value; | |
1da177e4 LT |
78 | if ((char *)value + sizeof(reiserfs_acl_entry_short) > end) |
79 | goto fail; | |
bd4c625c | 80 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
1da177e4 | 81 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
bd4c625c LT |
82 | switch (acl->a_entries[n].e_tag) { |
83 | case ACL_USER_OBJ: | |
84 | case ACL_GROUP_OBJ: | |
85 | case ACL_MASK: | |
86 | case ACL_OTHER: | |
87 | value = (char *)value + | |
88 | sizeof(reiserfs_acl_entry_short); | |
bd4c625c LT |
89 | break; |
90 | ||
91 | case ACL_USER: | |
df814654 EB |
92 | value = (char *)value + sizeof(reiserfs_acl_entry); |
93 | if ((char *)value > end) | |
94 | goto fail; | |
95 | acl->a_entries[n].e_uid = | |
96 | make_kuid(&init_user_ns, | |
97 | le32_to_cpu(entry->e_id)); | |
98 | break; | |
bd4c625c LT |
99 | case ACL_GROUP: |
100 | value = (char *)value + sizeof(reiserfs_acl_entry); | |
101 | if ((char *)value > end) | |
1da177e4 | 102 | goto fail; |
df814654 EB |
103 | acl->a_entries[n].e_gid = |
104 | make_kgid(&init_user_ns, | |
105 | le32_to_cpu(entry->e_id)); | |
bd4c625c LT |
106 | break; |
107 | ||
108 | default: | |
109 | goto fail; | |
1da177e4 LT |
110 | } |
111 | } | |
112 | if (value != end) | |
113 | goto fail; | |
114 | return acl; | |
115 | ||
cf776a7a | 116 | fail: |
1da177e4 LT |
117 | posix_acl_release(acl); |
118 | return ERR_PTR(-EINVAL); | |
119 | } | |
120 | ||
121 | /* | |
122 | * Convert from in-memory to filesystem representation. | |
123 | */ | |
9dad943a | 124 | static void *reiserfs_posix_acl_to_disk(const struct posix_acl *acl, size_t * size) |
1da177e4 LT |
125 | { |
126 | reiserfs_acl_header *ext_acl; | |
127 | char *e; | |
128 | int n; | |
129 | ||
130 | *size = reiserfs_acl_size(acl->a_count); | |
5cbded58 | 131 | ext_acl = kmalloc(sizeof(reiserfs_acl_header) + |
bd4c625c LT |
132 | acl->a_count * |
133 | sizeof(reiserfs_acl_entry), | |
134 | GFP_NOFS); | |
1da177e4 LT |
135 | if (!ext_acl) |
136 | return ERR_PTR(-ENOMEM); | |
137 | ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION); | |
138 | e = (char *)ext_acl + sizeof(reiserfs_acl_header); | |
bd4c625c | 139 | for (n = 0; n < acl->a_count; n++) { |
df814654 | 140 | const struct posix_acl_entry *acl_e = &acl->a_entries[n]; |
bd4c625c LT |
141 | reiserfs_acl_entry *entry = (reiserfs_acl_entry *) e; |
142 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
1da177e4 | 143 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
bd4c625c LT |
144 | switch (acl->a_entries[n].e_tag) { |
145 | case ACL_USER: | |
df814654 EB |
146 | entry->e_id = cpu_to_le32( |
147 | from_kuid(&init_user_ns, acl_e->e_uid)); | |
148 | e += sizeof(reiserfs_acl_entry); | |
149 | break; | |
bd4c625c | 150 | case ACL_GROUP: |
df814654 EB |
151 | entry->e_id = cpu_to_le32( |
152 | from_kgid(&init_user_ns, acl_e->e_gid)); | |
bd4c625c LT |
153 | e += sizeof(reiserfs_acl_entry); |
154 | break; | |
155 | ||
156 | case ACL_USER_OBJ: | |
157 | case ACL_GROUP_OBJ: | |
158 | case ACL_MASK: | |
159 | case ACL_OTHER: | |
160 | e += sizeof(reiserfs_acl_entry_short); | |
161 | break; | |
162 | ||
163 | default: | |
164 | goto fail; | |
1da177e4 LT |
165 | } |
166 | } | |
167 | return (char *)ext_acl; | |
168 | ||
cf776a7a | 169 | fail: |
1da177e4 LT |
170 | kfree(ext_acl); |
171 | return ERR_PTR(-EINVAL); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Inode operation get_posix_acl(). | |
176 | * | |
1b1dcc1b | 177 | * inode->i_mutex: down |
1da177e4 LT |
178 | * BKL held [before 2.5.x] |
179 | */ | |
bd4c625c | 180 | struct posix_acl *reiserfs_get_acl(struct inode *inode, int type) |
1da177e4 LT |
181 | { |
182 | char *name, *value; | |
073aaa1b | 183 | struct posix_acl *acl; |
3cdc409c | 184 | int size; |
1da177e4 | 185 | int retval; |
bd4c625c LT |
186 | |
187 | switch (type) { | |
188 | case ACL_TYPE_ACCESS: | |
189 | name = POSIX_ACL_XATTR_ACCESS; | |
bd4c625c LT |
190 | break; |
191 | case ACL_TYPE_DEFAULT: | |
192 | name = POSIX_ACL_XATTR_DEFAULT; | |
bd4c625c LT |
193 | break; |
194 | default: | |
073aaa1b | 195 | BUG(); |
bd4c625c LT |
196 | } |
197 | ||
bd4c625c | 198 | size = reiserfs_xattr_get(inode, name, NULL, 0); |
3cdc409c | 199 | if (size < 0) { |
bd4c625c | 200 | if (size == -ENODATA || size == -ENOSYS) { |
073aaa1b | 201 | set_cached_acl(inode, type, NULL); |
bd4c625c LT |
202 | return NULL; |
203 | } | |
204 | return ERR_PTR(size); | |
205 | } | |
1da177e4 | 206 | |
bd4c625c LT |
207 | value = kmalloc(size, GFP_NOFS); |
208 | if (!value) | |
209 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
210 | |
211 | retval = reiserfs_xattr_get(inode, name, value, size); | |
212 | if (retval == -ENODATA || retval == -ENOSYS) { | |
098297b2 JM |
213 | /* |
214 | * This shouldn't actually happen as it should have | |
215 | * been caught above.. but just in case | |
216 | */ | |
1da177e4 | 217 | acl = NULL; |
bd4c625c | 218 | } else if (retval < 0) { |
1da177e4 LT |
219 | acl = ERR_PTR(retval); |
220 | } else { | |
9dad943a | 221 | acl = reiserfs_posix_acl_from_disk(value, retval); |
bd4c625c | 222 | } |
073aaa1b AV |
223 | if (!IS_ERR(acl)) |
224 | set_cached_acl(inode, type, acl); | |
1da177e4 LT |
225 | |
226 | kfree(value); | |
227 | return acl; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Inode operation set_posix_acl(). | |
232 | * | |
1b1dcc1b | 233 | * inode->i_mutex: down |
1da177e4 LT |
234 | * BKL held [before 2.5.x] |
235 | */ | |
236 | static int | |
47f70d08 | 237 | __reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode, |
0ab2621e | 238 | int type, struct posix_acl *acl) |
1da177e4 | 239 | { |
bd4c625c | 240 | char *name; |
1da177e4 | 241 | void *value = NULL; |
48b32a35 | 242 | size_t size = 0; |
1da177e4 | 243 | int error; |
1da177e4 | 244 | |
bd4c625c LT |
245 | switch (type) { |
246 | case ACL_TYPE_ACCESS: | |
247 | name = POSIX_ACL_XATTR_ACCESS; | |
bd4c625c | 248 | if (acl) { |
d6952123 | 249 | error = posix_acl_equiv_mode(acl, &inode->i_mode); |
bd4c625c LT |
250 | if (error < 0) |
251 | return error; | |
252 | else { | |
bd4c625c LT |
253 | if (error == 0) |
254 | acl = NULL; | |
255 | } | |
256 | } | |
257 | break; | |
258 | case ACL_TYPE_DEFAULT: | |
259 | name = POSIX_ACL_XATTR_DEFAULT; | |
bd4c625c LT |
260 | if (!S_ISDIR(inode->i_mode)) |
261 | return acl ? -EACCES : 0; | |
262 | break; | |
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
267 | if (acl) { | |
9dad943a | 268 | value = reiserfs_posix_acl_to_disk(acl, &size); |
bd4c625c LT |
269 | if (IS_ERR(value)) |
270 | return (int)PTR_ERR(value); | |
48b32a35 JM |
271 | } |
272 | ||
0ab2621e | 273 | error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0); |
48b32a35 JM |
274 | |
275 | /* | |
276 | * Ensure that the inode gets dirtied if we're only using | |
277 | * the mode bits and an old ACL didn't exist. We don't need | |
278 | * to check if the inode is hashed here since we won't get | |
279 | * called by reiserfs_inherit_default_acl(). | |
280 | */ | |
281 | if (error == -ENODATA) { | |
282 | error = 0; | |
283 | if (type == ACL_TYPE_ACCESS) { | |
284 | inode->i_ctime = CURRENT_TIME_SEC; | |
bd4c625c | 285 | mark_inode_dirty(inode); |
bd4c625c LT |
286 | } |
287 | } | |
1da177e4 | 288 | |
833d304b | 289 | kfree(value); |
1da177e4 | 290 | |
d984561b | 291 | if (!error) |
073aaa1b | 292 | set_cached_acl(inode, type, acl); |
1da177e4 LT |
293 | |
294 | return error; | |
295 | } | |
296 | ||
098297b2 JM |
297 | /* |
298 | * dir->i_mutex: locked, | |
299 | * inode is new and not released into the wild yet | |
300 | */ | |
1da177e4 | 301 | int |
0ab2621e JM |
302 | reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th, |
303 | struct inode *dir, struct dentry *dentry, | |
bd4c625c | 304 | struct inode *inode) |
1da177e4 | 305 | { |
47f70d08 | 306 | struct posix_acl *default_acl, *acl; |
bd4c625c LT |
307 | int err = 0; |
308 | ||
309 | /* ACLs only get applied to files and directories */ | |
310 | if (S_ISLNK(inode->i_mode)) | |
311 | return 0; | |
312 | ||
098297b2 JM |
313 | /* |
314 | * ACLs can only be used on "new" objects, so if it's an old object | |
315 | * there is nothing to inherit from | |
316 | */ | |
bd4c625c LT |
317 | if (get_inode_sd_version(dir) == STAT_DATA_V1) |
318 | goto apply_umask; | |
319 | ||
098297b2 JM |
320 | /* |
321 | * Don't apply ACLs to objects in the .reiserfs_priv tree.. This | |
bd4c625c | 322 | * would be useless since permissions are ignored, and a pain because |
098297b2 JM |
323 | * it introduces locking cycles |
324 | */ | |
6dfede69 JM |
325 | if (IS_PRIVATE(dir)) { |
326 | inode->i_flags |= S_PRIVATE; | |
bd4c625c LT |
327 | goto apply_umask; |
328 | } | |
329 | ||
47f70d08 CH |
330 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
331 | if (err) | |
332 | return err; | |
bd4c625c | 333 | |
47f70d08 CH |
334 | if (default_acl) { |
335 | err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT, | |
336 | default_acl); | |
337 | posix_acl_release(default_acl); | |
338 | } | |
bd4c625c | 339 | if (acl) { |
47f70d08 CH |
340 | if (!err) |
341 | err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS, | |
342 | acl); | |
bd4c625c | 343 | posix_acl_release(acl); |
bd4c625c LT |
344 | } |
345 | ||
346 | return err; | |
47f70d08 | 347 | |
cf776a7a | 348 | apply_umask: |
47f70d08 CH |
349 | /* no ACL, apply umask */ |
350 | inode->i_mode &= ~current_umask(); | |
351 | return err; | |
1da177e4 LT |
352 | } |
353 | ||
0ab2621e JM |
354 | /* This is used to cache the default acl before a new object is created. |
355 | * The biggest reason for this is to get an idea of how many blocks will | |
356 | * actually be required for the create operation if we must inherit an ACL. | |
357 | * An ACL write can add up to 3 object creations and an additional file write | |
358 | * so we'd prefer not to reserve that many blocks in the journal if we can. | |
359 | * It also has the advantage of not loading the ACL with a transaction open, | |
360 | * this may seem silly, but if the owner of the directory is doing the | |
361 | * creation, the ACL may not be loaded since the permissions wouldn't require | |
362 | * it. | |
363 | * We return the number of blocks required for the transaction. | |
364 | */ | |
bd4c625c | 365 | int reiserfs_cache_default_acl(struct inode *inode) |
1da177e4 | 366 | { |
0ab2621e JM |
367 | struct posix_acl *acl; |
368 | int nblocks = 0; | |
369 | ||
370 | if (IS_PRIVATE(inode)) | |
371 | return 0; | |
372 | ||
373 | acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT); | |
374 | ||
375 | if (acl && !IS_ERR(acl)) { | |
376 | int size = reiserfs_acl_size(acl->a_count); | |
377 | ||
378 | /* Other xattrs can be created during inode creation. We don't | |
379 | * want to claim too many blocks, so we check to see if we | |
380 | * we need to create the tree to the xattrs, and then we | |
381 | * just want two files. */ | |
382 | nblocks = reiserfs_xattr_jcreate_nblocks(inode); | |
383 | nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); | |
384 | ||
385 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; | |
386 | ||
387 | /* We need to account for writes + bitmaps for two files */ | |
388 | nblocks += reiserfs_xattr_nblocks(inode, size) * 4; | |
389 | posix_acl_release(acl); | |
bd4c625c LT |
390 | } |
391 | ||
0ab2621e | 392 | return nblocks; |
1da177e4 LT |
393 | } |
394 | ||
4c05141d JM |
395 | /* |
396 | * Called under i_mutex | |
397 | */ | |
bd4c625c | 398 | int reiserfs_acl_chmod(struct inode *inode) |
1da177e4 | 399 | { |
4a857011 JM |
400 | if (IS_PRIVATE(inode)) |
401 | return 0; | |
bd4c625c | 402 | if (get_inode_sd_version(inode) == STAT_DATA_V1 || |
47f70d08 | 403 | !reiserfs_posixacl(inode->i_sb)) |
bd4c625c | 404 | return 0; |
1da177e4 | 405 | |
47f70d08 | 406 | return posix_acl_chmod(inode, inode->i_mode); |
1da177e4 | 407 | } |