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929fb014 TY |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * acl.c | |
5 | * | |
6 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. | |
7 | * | |
8 | * CREDITS: | |
9 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. | |
10 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public | |
14 | * License version 2 as published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
929fb014 TY |
25 | #include <linux/string.h> |
26 | ||
929fb014 TY |
27 | #include <cluster/masklog.h> |
28 | ||
29 | #include "ocfs2.h" | |
30 | #include "alloc.h" | |
31 | #include "dlmglue.h" | |
32 | #include "file.h" | |
fcefd25a MF |
33 | #include "inode.h" |
34 | #include "journal.h" | |
929fb014 TY |
35 | #include "ocfs2_fs.h" |
36 | ||
37 | #include "xattr.h" | |
38 | #include "acl.h" | |
39 | ||
40 | /* | |
41 | * Convert from xattr value to acl struct. | |
42 | */ | |
43 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) | |
44 | { | |
45 | int n, count; | |
46 | struct posix_acl *acl; | |
47 | ||
48 | if (!value) | |
49 | return NULL; | |
50 | if (size < sizeof(struct posix_acl_entry)) | |
51 | return ERR_PTR(-EINVAL); | |
52 | ||
53 | count = size / sizeof(struct posix_acl_entry); | |
929fb014 TY |
54 | |
55 | acl = posix_acl_alloc(count, GFP_NOFS); | |
56 | if (!acl) | |
57 | return ERR_PTR(-ENOMEM); | |
58 | for (n = 0; n < count; n++) { | |
59 | struct ocfs2_acl_entry *entry = | |
60 | (struct ocfs2_acl_entry *)value; | |
61 | ||
62 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); | |
63 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); | |
9522751c EB |
64 | switch(acl->a_entries[n].e_tag) { |
65 | case ACL_USER: | |
66 | acl->a_entries[n].e_uid = | |
67 | make_kuid(&init_user_ns, | |
68 | le32_to_cpu(entry->e_id)); | |
69 | break; | |
70 | case ACL_GROUP: | |
71 | acl->a_entries[n].e_gid = | |
72 | make_kgid(&init_user_ns, | |
73 | le32_to_cpu(entry->e_id)); | |
74 | break; | |
75 | default: | |
76 | break; | |
77 | } | |
929fb014 TY |
78 | value += sizeof(struct posix_acl_entry); |
79 | ||
80 | } | |
81 | return acl; | |
82 | } | |
83 | ||
84 | /* | |
85 | * Convert acl struct to xattr value. | |
86 | */ | |
87 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) | |
88 | { | |
89 | struct ocfs2_acl_entry *entry = NULL; | |
90 | char *ocfs2_acl; | |
91 | size_t n; | |
92 | ||
93 | *size = acl->a_count * sizeof(struct posix_acl_entry); | |
94 | ||
95 | ocfs2_acl = kmalloc(*size, GFP_NOFS); | |
96 | if (!ocfs2_acl) | |
97 | return ERR_PTR(-ENOMEM); | |
98 | ||
99 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; | |
100 | for (n = 0; n < acl->a_count; n++, entry++) { | |
101 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
102 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); | |
9522751c EB |
103 | switch(acl->a_entries[n].e_tag) { |
104 | case ACL_USER: | |
105 | entry->e_id = cpu_to_le32( | |
106 | from_kuid(&init_user_ns, | |
107 | acl->a_entries[n].e_uid)); | |
108 | break; | |
109 | case ACL_GROUP: | |
110 | entry->e_id = cpu_to_le32( | |
111 | from_kgid(&init_user_ns, | |
112 | acl->a_entries[n].e_gid)); | |
113 | break; | |
114 | default: | |
115 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); | |
116 | break; | |
117 | } | |
929fb014 TY |
118 | } |
119 | return ocfs2_acl; | |
120 | } | |
121 | ||
122 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, | |
123 | int type, | |
124 | struct buffer_head *di_bh) | |
125 | { | |
929fb014 TY |
126 | int name_index; |
127 | char *value = NULL; | |
128 | struct posix_acl *acl; | |
129 | int retval; | |
130 | ||
929fb014 TY |
131 | switch (type) { |
132 | case ACL_TYPE_ACCESS: | |
133 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
134 | break; | |
135 | case ACL_TYPE_DEFAULT: | |
136 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
137 | break; | |
138 | default: | |
139 | return ERR_PTR(-EINVAL); | |
140 | } | |
141 | ||
142 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); | |
143 | if (retval > 0) { | |
144 | value = kmalloc(retval, GFP_NOFS); | |
145 | if (!value) | |
146 | return ERR_PTR(-ENOMEM); | |
147 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, | |
148 | "", value, retval); | |
149 | } | |
150 | ||
151 | if (retval > 0) | |
152 | acl = ocfs2_acl_from_xattr(value, retval); | |
153 | else if (retval == -ENODATA || retval == 0) | |
154 | acl = NULL; | |
155 | else | |
156 | acl = ERR_PTR(retval); | |
157 | ||
158 | kfree(value); | |
159 | ||
160 | return acl; | |
161 | } | |
162 | ||
163 | ||
164 | /* | |
165 | * Get posix acl. | |
166 | */ | |
167 | static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type) | |
168 | { | |
169 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
170 | struct buffer_head *di_bh = NULL; | |
171 | struct posix_acl *acl; | |
172 | int ret; | |
173 | ||
174 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
175 | return NULL; | |
176 | ||
177 | ret = ocfs2_inode_lock(inode, &di_bh, 0); | |
178 | if (ret < 0) { | |
179 | mlog_errno(ret); | |
180 | acl = ERR_PTR(ret); | |
181 | return acl; | |
182 | } | |
183 | ||
184 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); | |
185 | ||
186 | ocfs2_inode_unlock(inode, 0); | |
187 | ||
188 | brelse(di_bh); | |
189 | ||
190 | return acl; | |
191 | } | |
192 | ||
fcefd25a MF |
193 | /* |
194 | * Helper function to set i_mode in memory and disk. Some call paths | |
195 | * will not have di_bh or a journal handle to pass, in which case it | |
196 | * will create it's own. | |
197 | */ | |
198 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, | |
199 | handle_t *handle, umode_t new_mode) | |
200 | { | |
201 | int ret, commit_handle = 0; | |
202 | struct ocfs2_dinode *di; | |
203 | ||
204 | if (di_bh == NULL) { | |
205 | ret = ocfs2_read_inode_block(inode, &di_bh); | |
206 | if (ret) { | |
207 | mlog_errno(ret); | |
208 | goto out; | |
209 | } | |
210 | } else | |
211 | get_bh(di_bh); | |
212 | ||
213 | if (handle == NULL) { | |
214 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), | |
215 | OCFS2_INODE_UPDATE_CREDITS); | |
216 | if (IS_ERR(handle)) { | |
217 | ret = PTR_ERR(handle); | |
218 | mlog_errno(ret); | |
219 | goto out_brelse; | |
220 | } | |
221 | ||
222 | commit_handle = 1; | |
223 | } | |
224 | ||
225 | di = (struct ocfs2_dinode *)di_bh->b_data; | |
226 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
227 | OCFS2_JOURNAL_ACCESS_WRITE); | |
228 | if (ret) { | |
229 | mlog_errno(ret); | |
230 | goto out_commit; | |
231 | } | |
232 | ||
233 | inode->i_mode = new_mode; | |
12828061 | 234 | inode->i_ctime = CURRENT_TIME; |
fcefd25a | 235 | di->i_mode = cpu_to_le16(inode->i_mode); |
12828061 TM |
236 | di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); |
237 | di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); | |
fcefd25a MF |
238 | |
239 | ocfs2_journal_dirty(handle, di_bh); | |
240 | ||
241 | out_commit: | |
242 | if (commit_handle) | |
243 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
244 | out_brelse: | |
245 | brelse(di_bh); | |
246 | out: | |
247 | return ret; | |
248 | } | |
249 | ||
929fb014 TY |
250 | /* |
251 | * Set the access or default ACL of an inode. | |
252 | */ | |
253 | static int ocfs2_set_acl(handle_t *handle, | |
254 | struct inode *inode, | |
255 | struct buffer_head *di_bh, | |
256 | int type, | |
257 | struct posix_acl *acl, | |
258 | struct ocfs2_alloc_context *meta_ac, | |
259 | struct ocfs2_alloc_context *data_ac) | |
260 | { | |
261 | int name_index; | |
262 | void *value = NULL; | |
263 | size_t size = 0; | |
264 | int ret; | |
265 | ||
266 | if (S_ISLNK(inode->i_mode)) | |
267 | return -EOPNOTSUPP; | |
268 | ||
269 | switch (type) { | |
270 | case ACL_TYPE_ACCESS: | |
271 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
272 | if (acl) { | |
d6952123 | 273 | umode_t mode = inode->i_mode; |
929fb014 TY |
274 | ret = posix_acl_equiv_mode(acl, &mode); |
275 | if (ret < 0) | |
276 | return ret; | |
277 | else { | |
929fb014 TY |
278 | if (ret == 0) |
279 | acl = NULL; | |
fcefd25a MF |
280 | |
281 | ret = ocfs2_acl_set_mode(inode, di_bh, | |
282 | handle, mode); | |
283 | if (ret) | |
284 | return ret; | |
285 | ||
929fb014 TY |
286 | } |
287 | } | |
288 | break; | |
289 | case ACL_TYPE_DEFAULT: | |
290 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
291 | if (!S_ISDIR(inode->i_mode)) | |
292 | return acl ? -EACCES : 0; | |
293 | break; | |
294 | default: | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
298 | if (acl) { | |
299 | value = ocfs2_acl_to_xattr(acl, &size); | |
300 | if (IS_ERR(value)) | |
301 | return (int)PTR_ERR(value); | |
302 | } | |
303 | ||
304 | if (handle) | |
305 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, | |
306 | "", value, size, 0, | |
307 | meta_ac, data_ac); | |
308 | else | |
309 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); | |
310 | ||
311 | kfree(value); | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
4e34e719 | 316 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type) |
23fc2702 | 317 | { |
b74c79e9 | 318 | struct ocfs2_super *osb; |
845b6cf3 JZ |
319 | struct buffer_head *di_bh = NULL; |
320 | struct posix_acl *acl; | |
321 | int ret = -EAGAIN; | |
322 | ||
b74c79e9 | 323 | osb = OCFS2_SB(inode->i_sb); |
845b6cf3 | 324 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
4e34e719 | 325 | return NULL; |
23fc2702 | 326 | |
845b6cf3 | 327 | ret = ocfs2_read_inode_block(inode, &di_bh); |
4e34e719 CH |
328 | if (ret < 0) |
329 | return ERR_PTR(ret); | |
845b6cf3 | 330 | |
4e34e719 | 331 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
845b6cf3 JZ |
332 | |
333 | brelse(di_bh); | |
334 | ||
4e34e719 | 335 | return acl; |
23fc2702 TY |
336 | } |
337 | ||
060bc66d TY |
338 | int ocfs2_acl_chmod(struct inode *inode) |
339 | { | |
340 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
bc26ab5f | 341 | struct posix_acl *acl; |
060bc66d TY |
342 | int ret; |
343 | ||
344 | if (S_ISLNK(inode->i_mode)) | |
345 | return -EOPNOTSUPP; | |
346 | ||
347 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
348 | return 0; | |
349 | ||
350 | acl = ocfs2_get_acl(inode, ACL_TYPE_ACCESS); | |
351 | if (IS_ERR(acl) || !acl) | |
352 | return PTR_ERR(acl); | |
5bf3258f | 353 | ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
bc26ab5f AV |
354 | if (ret) |
355 | return ret; | |
356 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, | |
357 | acl, NULL, NULL); | |
060bc66d | 358 | posix_acl_release(acl); |
060bc66d TY |
359 | return ret; |
360 | } | |
361 | ||
89c38bd0 TY |
362 | /* |
363 | * Initialize the ACLs of a new inode. If parent directory has default ACL, | |
364 | * then clone to new inode. Called from ocfs2_mknod. | |
365 | */ | |
366 | int ocfs2_init_acl(handle_t *handle, | |
367 | struct inode *inode, | |
368 | struct inode *dir, | |
369 | struct buffer_head *di_bh, | |
370 | struct buffer_head *dir_bh, | |
371 | struct ocfs2_alloc_context *meta_ac, | |
372 | struct ocfs2_alloc_context *data_ac) | |
373 | { | |
374 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
375 | struct posix_acl *acl = NULL; | |
6eda3dd3 | 376 | int ret = 0, ret2; |
d3fb6120 | 377 | umode_t mode; |
89c38bd0 TY |
378 | |
379 | if (!S_ISLNK(inode->i_mode)) { | |
380 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { | |
381 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, | |
382 | dir_bh); | |
383 | if (IS_ERR(acl)) | |
384 | return PTR_ERR(acl); | |
385 | } | |
fcefd25a MF |
386 | if (!acl) { |
387 | mode = inode->i_mode & ~current_umask(); | |
388 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); | |
389 | if (ret) { | |
390 | mlog_errno(ret); | |
391 | goto cleanup; | |
392 | } | |
393 | } | |
89c38bd0 TY |
394 | } |
395 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { | |
89c38bd0 TY |
396 | if (S_ISDIR(inode->i_mode)) { |
397 | ret = ocfs2_set_acl(handle, inode, di_bh, | |
398 | ACL_TYPE_DEFAULT, acl, | |
399 | meta_ac, data_ac); | |
400 | if (ret) | |
401 | goto cleanup; | |
402 | } | |
89c38bd0 | 403 | mode = inode->i_mode; |
37bc1539 | 404 | ret = __posix_acl_create(&acl, GFP_NOFS, &mode); |
826cae2f AV |
405 | if (ret < 0) |
406 | return ret; | |
407 | ||
408 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); | |
409 | if (ret2) { | |
410 | mlog_errno(ret2); | |
411 | ret = ret2; | |
412 | goto cleanup; | |
413 | } | |
414 | if (ret > 0) { | |
415 | ret = ocfs2_set_acl(handle, inode, | |
416 | di_bh, ACL_TYPE_ACCESS, | |
417 | acl, meta_ac, data_ac); | |
89c38bd0 | 418 | } |
89c38bd0 TY |
419 | } |
420 | cleanup: | |
421 | posix_acl_release(acl); | |
422 | return ret; | |
423 | } | |
424 | ||
431547b3 | 425 | static size_t ocfs2_xattr_list_acl_access(struct dentry *dentry, |
929fb014 TY |
426 | char *list, |
427 | size_t list_len, | |
428 | const char *name, | |
431547b3 CH |
429 | size_t name_len, |
430 | int type) | |
929fb014 | 431 | { |
431547b3 | 432 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
433 | const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS); |
434 | ||
435 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
436 | return 0; | |
437 | ||
438 | if (list && size <= list_len) | |
439 | memcpy(list, POSIX_ACL_XATTR_ACCESS, size); | |
440 | return size; | |
441 | } | |
442 | ||
431547b3 | 443 | static size_t ocfs2_xattr_list_acl_default(struct dentry *dentry, |
929fb014 TY |
444 | char *list, |
445 | size_t list_len, | |
446 | const char *name, | |
431547b3 CH |
447 | size_t name_len, |
448 | int type) | |
929fb014 | 449 | { |
431547b3 | 450 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
451 | const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT); |
452 | ||
453 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
454 | return 0; | |
455 | ||
456 | if (list && size <= list_len) | |
457 | memcpy(list, POSIX_ACL_XATTR_DEFAULT, size); | |
458 | return size; | |
459 | } | |
460 | ||
431547b3 CH |
461 | static int ocfs2_xattr_get_acl(struct dentry *dentry, const char *name, |
462 | void *buffer, size_t size, int type) | |
929fb014 | 463 | { |
431547b3 | 464 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
929fb014 TY |
465 | struct posix_acl *acl; |
466 | int ret; | |
467 | ||
431547b3 CH |
468 | if (strcmp(name, "") != 0) |
469 | return -EINVAL; | |
929fb014 TY |
470 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
471 | return -EOPNOTSUPP; | |
472 | ||
431547b3 | 473 | acl = ocfs2_get_acl(dentry->d_inode, type); |
929fb014 TY |
474 | if (IS_ERR(acl)) |
475 | return PTR_ERR(acl); | |
476 | if (acl == NULL) | |
477 | return -ENODATA; | |
5f3a4a28 | 478 | ret = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
929fb014 TY |
479 | posix_acl_release(acl); |
480 | ||
481 | return ret; | |
482 | } | |
483 | ||
431547b3 CH |
484 | static int ocfs2_xattr_set_acl(struct dentry *dentry, const char *name, |
485 | const void *value, size_t size, int flags, int type) | |
929fb014 | 486 | { |
431547b3 | 487 | struct inode *inode = dentry->d_inode; |
929fb014 TY |
488 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
489 | struct posix_acl *acl; | |
490 | int ret = 0; | |
491 | ||
431547b3 CH |
492 | if (strcmp(name, "") != 0) |
493 | return -EINVAL; | |
929fb014 TY |
494 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
495 | return -EOPNOTSUPP; | |
496 | ||
2e149670 | 497 | if (!inode_owner_or_capable(inode)) |
929fb014 TY |
498 | return -EPERM; |
499 | ||
500 | if (value) { | |
5f3a4a28 | 501 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
929fb014 TY |
502 | if (IS_ERR(acl)) |
503 | return PTR_ERR(acl); | |
504 | else if (acl) { | |
505 | ret = posix_acl_valid(acl); | |
506 | if (ret) | |
507 | goto cleanup; | |
508 | } | |
509 | } else | |
510 | acl = NULL; | |
511 | ||
512 | ret = ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL); | |
513 | ||
514 | cleanup: | |
515 | posix_acl_release(acl); | |
516 | return ret; | |
517 | } | |
518 | ||
537d81ca | 519 | const struct xattr_handler ocfs2_xattr_acl_access_handler = { |
929fb014 | 520 | .prefix = POSIX_ACL_XATTR_ACCESS, |
431547b3 | 521 | .flags = ACL_TYPE_ACCESS, |
929fb014 | 522 | .list = ocfs2_xattr_list_acl_access, |
431547b3 CH |
523 | .get = ocfs2_xattr_get_acl, |
524 | .set = ocfs2_xattr_set_acl, | |
929fb014 TY |
525 | }; |
526 | ||
537d81ca | 527 | const struct xattr_handler ocfs2_xattr_acl_default_handler = { |
929fb014 | 528 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
431547b3 | 529 | .flags = ACL_TYPE_DEFAULT, |
929fb014 | 530 | .list = ocfs2_xattr_list_acl_default, |
431547b3 CH |
531 | .get = ocfs2_xattr_get_acl, |
532 | .set = ocfs2_xattr_set_acl, | |
929fb014 | 533 | }; |