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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fa60ce2c | 2 | /* |
929fb014 TY |
3 | * acl.c |
4 | * | |
5 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. | |
6 | * | |
7 | * CREDITS: | |
8 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. | |
9 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> | |
929fb014 TY |
10 | */ |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
929fb014 TY |
15 | #include <linux/string.h> |
16 | ||
929fb014 TY |
17 | #include <cluster/masklog.h> |
18 | ||
19 | #include "ocfs2.h" | |
20 | #include "alloc.h" | |
21 | #include "dlmglue.h" | |
22 | #include "file.h" | |
fcefd25a MF |
23 | #include "inode.h" |
24 | #include "journal.h" | |
929fb014 TY |
25 | #include "ocfs2_fs.h" |
26 | ||
27 | #include "xattr.h" | |
28 | #include "acl.h" | |
29 | ||
30 | /* | |
31 | * Convert from xattr value to acl struct. | |
32 | */ | |
33 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) | |
34 | { | |
35 | int n, count; | |
36 | struct posix_acl *acl; | |
37 | ||
38 | if (!value) | |
39 | return NULL; | |
40 | if (size < sizeof(struct posix_acl_entry)) | |
41 | return ERR_PTR(-EINVAL); | |
42 | ||
43 | count = size / sizeof(struct posix_acl_entry); | |
929fb014 TY |
44 | |
45 | acl = posix_acl_alloc(count, GFP_NOFS); | |
46 | if (!acl) | |
47 | return ERR_PTR(-ENOMEM); | |
48 | for (n = 0; n < count; n++) { | |
49 | struct ocfs2_acl_entry *entry = | |
50 | (struct ocfs2_acl_entry *)value; | |
51 | ||
52 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); | |
53 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); | |
9522751c EB |
54 | switch(acl->a_entries[n].e_tag) { |
55 | case ACL_USER: | |
56 | acl->a_entries[n].e_uid = | |
57 | make_kuid(&init_user_ns, | |
58 | le32_to_cpu(entry->e_id)); | |
59 | break; | |
60 | case ACL_GROUP: | |
61 | acl->a_entries[n].e_gid = | |
62 | make_kgid(&init_user_ns, | |
63 | le32_to_cpu(entry->e_id)); | |
64 | break; | |
65 | default: | |
66 | break; | |
67 | } | |
929fb014 TY |
68 | value += sizeof(struct posix_acl_entry); |
69 | ||
70 | } | |
71 | return acl; | |
72 | } | |
73 | ||
74 | /* | |
75 | * Convert acl struct to xattr value. | |
76 | */ | |
77 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) | |
78 | { | |
79 | struct ocfs2_acl_entry *entry = NULL; | |
80 | char *ocfs2_acl; | |
81 | size_t n; | |
82 | ||
83 | *size = acl->a_count * sizeof(struct posix_acl_entry); | |
84 | ||
85 | ocfs2_acl = kmalloc(*size, GFP_NOFS); | |
86 | if (!ocfs2_acl) | |
87 | return ERR_PTR(-ENOMEM); | |
88 | ||
89 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; | |
90 | for (n = 0; n < acl->a_count; n++, entry++) { | |
91 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
92 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); | |
9522751c EB |
93 | switch(acl->a_entries[n].e_tag) { |
94 | case ACL_USER: | |
95 | entry->e_id = cpu_to_le32( | |
96 | from_kuid(&init_user_ns, | |
97 | acl->a_entries[n].e_uid)); | |
98 | break; | |
99 | case ACL_GROUP: | |
100 | entry->e_id = cpu_to_le32( | |
101 | from_kgid(&init_user_ns, | |
102 | acl->a_entries[n].e_gid)); | |
103 | break; | |
104 | default: | |
105 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); | |
106 | break; | |
107 | } | |
929fb014 TY |
108 | } |
109 | return ocfs2_acl; | |
110 | } | |
111 | ||
112 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, | |
113 | int type, | |
114 | struct buffer_head *di_bh) | |
115 | { | |
929fb014 TY |
116 | int name_index; |
117 | char *value = NULL; | |
118 | struct posix_acl *acl; | |
119 | int retval; | |
120 | ||
929fb014 TY |
121 | switch (type) { |
122 | case ACL_TYPE_ACCESS: | |
123 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
124 | break; | |
125 | case ACL_TYPE_DEFAULT: | |
126 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
127 | break; | |
128 | default: | |
129 | return ERR_PTR(-EINVAL); | |
130 | } | |
131 | ||
132 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0); | |
133 | if (retval > 0) { | |
134 | value = kmalloc(retval, GFP_NOFS); | |
135 | if (!value) | |
136 | return ERR_PTR(-ENOMEM); | |
137 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, | |
138 | "", value, retval); | |
139 | } | |
140 | ||
141 | if (retval > 0) | |
142 | acl = ocfs2_acl_from_xattr(value, retval); | |
143 | else if (retval == -ENODATA || retval == 0) | |
144 | acl = NULL; | |
145 | else | |
146 | acl = ERR_PTR(retval); | |
147 | ||
148 | kfree(value); | |
149 | ||
150 | return acl; | |
151 | } | |
152 | ||
fcefd25a MF |
153 | /* |
154 | * Helper function to set i_mode in memory and disk. Some call paths | |
155 | * will not have di_bh or a journal handle to pass, in which case it | |
156 | * will create it's own. | |
157 | */ | |
158 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, | |
159 | handle_t *handle, umode_t new_mode) | |
160 | { | |
161 | int ret, commit_handle = 0; | |
162 | struct ocfs2_dinode *di; | |
163 | ||
164 | if (di_bh == NULL) { | |
165 | ret = ocfs2_read_inode_block(inode, &di_bh); | |
166 | if (ret) { | |
167 | mlog_errno(ret); | |
168 | goto out; | |
169 | } | |
170 | } else | |
171 | get_bh(di_bh); | |
172 | ||
173 | if (handle == NULL) { | |
174 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), | |
175 | OCFS2_INODE_UPDATE_CREDITS); | |
176 | if (IS_ERR(handle)) { | |
177 | ret = PTR_ERR(handle); | |
178 | mlog_errno(ret); | |
179 | goto out_brelse; | |
180 | } | |
181 | ||
182 | commit_handle = 1; | |
183 | } | |
184 | ||
185 | di = (struct ocfs2_dinode *)di_bh->b_data; | |
186 | ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, | |
187 | OCFS2_JOURNAL_ACCESS_WRITE); | |
188 | if (ret) { | |
189 | mlog_errno(ret); | |
190 | goto out_commit; | |
191 | } | |
192 | ||
193 | inode->i_mode = new_mode; | |
6861de97 | 194 | inode_set_ctime_current(inode); |
fcefd25a | 195 | di->i_mode = cpu_to_le16(inode->i_mode); |
fd6acbbc JL |
196 | di->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode)); |
197 | di->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode)); | |
6fdb702d | 198 | ocfs2_update_inode_fsync_trans(handle, inode, 0); |
fcefd25a MF |
199 | |
200 | ocfs2_journal_dirty(handle, di_bh); | |
201 | ||
202 | out_commit: | |
203 | if (commit_handle) | |
204 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); | |
205 | out_brelse: | |
206 | brelse(di_bh); | |
207 | out: | |
208 | return ret; | |
209 | } | |
210 | ||
929fb014 TY |
211 | /* |
212 | * Set the access or default ACL of an inode. | |
213 | */ | |
01ffb56b | 214 | static int ocfs2_set_acl(handle_t *handle, |
929fb014 TY |
215 | struct inode *inode, |
216 | struct buffer_head *di_bh, | |
217 | int type, | |
218 | struct posix_acl *acl, | |
219 | struct ocfs2_alloc_context *meta_ac, | |
220 | struct ocfs2_alloc_context *data_ac) | |
221 | { | |
222 | int name_index; | |
223 | void *value = NULL; | |
224 | size_t size = 0; | |
225 | int ret; | |
226 | ||
227 | if (S_ISLNK(inode->i_mode)) | |
228 | return -EOPNOTSUPP; | |
229 | ||
230 | switch (type) { | |
231 | case ACL_TYPE_ACCESS: | |
232 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; | |
929fb014 TY |
233 | break; |
234 | case ACL_TYPE_DEFAULT: | |
235 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; | |
236 | if (!S_ISDIR(inode->i_mode)) | |
237 | return acl ? -EACCES : 0; | |
238 | break; | |
239 | default: | |
240 | return -EINVAL; | |
241 | } | |
242 | ||
243 | if (acl) { | |
244 | value = ocfs2_acl_to_xattr(acl, &size); | |
245 | if (IS_ERR(value)) | |
246 | return (int)PTR_ERR(value); | |
247 | } | |
248 | ||
249 | if (handle) | |
250 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, | |
251 | "", value, size, 0, | |
252 | meta_ac, data_ac); | |
253 | else | |
254 | ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0); | |
255 | ||
256 | kfree(value); | |
504ec37d GH |
257 | if (!ret) |
258 | set_cached_acl(inode, type, acl); | |
929fb014 TY |
259 | |
260 | return ret; | |
261 | } | |
262 | ||
13e83a49 | 263 | int ocfs2_iop_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
549c7297 | 264 | struct posix_acl *acl, int type) |
702e5bc6 | 265 | { |
743b5f14 | 266 | struct buffer_head *bh = NULL; |
b891fa50 ER |
267 | int status, had_lock; |
268 | struct ocfs2_lock_holder oh; | |
138060ba | 269 | struct inode *inode = d_inode(dentry); |
743b5f14 | 270 | |
b891fa50 ER |
271 | had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh); |
272 | if (had_lock < 0) | |
273 | return had_lock; | |
19ec8e48 JK |
274 | if (type == ACL_TYPE_ACCESS && acl) { |
275 | umode_t mode; | |
276 | ||
700b7940 | 277 | status = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, |
e65ce2a5 | 278 | &acl); |
19ec8e48 JK |
279 | if (status) |
280 | goto unlock; | |
281 | ||
282 | status = ocfs2_acl_set_mode(inode, bh, NULL, mode); | |
283 | if (status) | |
284 | goto unlock; | |
285 | } | |
743b5f14 | 286 | status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL); |
19ec8e48 | 287 | unlock: |
b891fa50 | 288 | ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock); |
743b5f14 TS |
289 | brelse(bh); |
290 | return status; | |
702e5bc6 CH |
291 | } |
292 | ||
0cad6246 | 293 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu) |
23fc2702 | 294 | { |
b74c79e9 | 295 | struct ocfs2_super *osb; |
845b6cf3 JZ |
296 | struct buffer_head *di_bh = NULL; |
297 | struct posix_acl *acl; | |
b891fa50 ER |
298 | int had_lock; |
299 | struct ocfs2_lock_holder oh; | |
845b6cf3 | 300 | |
0cad6246 MS |
301 | if (rcu) |
302 | return ERR_PTR(-ECHILD); | |
303 | ||
b74c79e9 | 304 | osb = OCFS2_SB(inode->i_sb); |
845b6cf3 | 305 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
4e34e719 | 306 | return NULL; |
b891fa50 ER |
307 | |
308 | had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh); | |
309 | if (had_lock < 0) | |
310 | return ERR_PTR(had_lock); | |
845b6cf3 | 311 | |
16c8d569 | 312 | down_read(&OCFS2_I(inode)->ip_xattr_sem); |
4e34e719 | 313 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
16c8d569 | 314 | up_read(&OCFS2_I(inode)->ip_xattr_sem); |
845b6cf3 | 315 | |
b891fa50 | 316 | ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock); |
845b6cf3 | 317 | brelse(di_bh); |
4e34e719 | 318 | return acl; |
23fc2702 | 319 | } |
5ee0fbd5 JB |
320 | |
321 | int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh) | |
322 | { | |
323 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
324 | struct posix_acl *acl; | |
325 | int ret; | |
326 | ||
327 | if (S_ISLNK(inode->i_mode)) | |
328 | return -EOPNOTSUPP; | |
329 | ||
330 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) | |
331 | return 0; | |
332 | ||
16c8d569 | 333 | down_read(&OCFS2_I(inode)->ip_xattr_sem); |
5ee0fbd5 | 334 | acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh); |
16c8d569 | 335 | up_read(&OCFS2_I(inode)->ip_xattr_sem); |
188c523e DX |
336 | if (IS_ERR_OR_NULL(acl)) |
337 | return PTR_ERR_OR_ZERO(acl); | |
5ee0fbd5 JB |
338 | ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
339 | if (ret) | |
340 | return ret; | |
341 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, | |
342 | acl, NULL, NULL); | |
343 | posix_acl_release(acl); | |
344 | return ret; | |
345 | } | |
c25a1e06 JB |
346 | |
347 | /* | |
348 | * Initialize the ACLs of a new inode. If parent directory has default ACL, | |
349 | * then clone to new inode. Called from ocfs2_mknod. | |
350 | */ | |
351 | int ocfs2_init_acl(handle_t *handle, | |
352 | struct inode *inode, | |
353 | struct inode *dir, | |
354 | struct buffer_head *di_bh, | |
355 | struct buffer_head *dir_bh, | |
356 | struct ocfs2_alloc_context *meta_ac, | |
357 | struct ocfs2_alloc_context *data_ac) | |
358 | { | |
359 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
360 | struct posix_acl *acl = NULL; | |
361 | int ret = 0, ret2; | |
362 | umode_t mode; | |
363 | ||
364 | if (!S_ISLNK(inode->i_mode)) { | |
365 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { | |
16c8d569 | 366 | down_read(&OCFS2_I(dir)->ip_xattr_sem); |
c25a1e06 JB |
367 | acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT, |
368 | dir_bh); | |
16c8d569 | 369 | up_read(&OCFS2_I(dir)->ip_xattr_sem); |
c25a1e06 JB |
370 | if (IS_ERR(acl)) |
371 | return PTR_ERR(acl); | |
372 | } | |
373 | if (!acl) { | |
374 | mode = inode->i_mode & ~current_umask(); | |
375 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode); | |
376 | if (ret) { | |
377 | mlog_errno(ret); | |
378 | goto cleanup; | |
379 | } | |
380 | } | |
381 | } | |
382 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { | |
383 | if (S_ISDIR(inode->i_mode)) { | |
384 | ret = ocfs2_set_acl(handle, inode, di_bh, | |
385 | ACL_TYPE_DEFAULT, acl, | |
386 | meta_ac, data_ac); | |
387 | if (ret) | |
388 | goto cleanup; | |
389 | } | |
390 | mode = inode->i_mode; | |
391 | ret = __posix_acl_create(&acl, GFP_NOFS, &mode); | |
392 | if (ret < 0) | |
393 | return ret; | |
394 | ||
395 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode); | |
396 | if (ret2) { | |
397 | mlog_errno(ret2); | |
398 | ret = ret2; | |
399 | goto cleanup; | |
400 | } | |
401 | if (ret > 0) { | |
402 | ret = ocfs2_set_acl(handle, inode, | |
403 | di_bh, ACL_TYPE_ACCESS, | |
404 | acl, meta_ac, data_ac); | |
405 | } | |
406 | } | |
407 | cleanup: | |
408 | posix_acl_release(acl); | |
409 | return ret; | |
410 | } |