1
2
3
4
5
6
7
8
9
10
11
12
13
14#include <linux/init.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18
19#include <cluster/masklog.h>
20
21#include "ocfs2.h"
22#include "alloc.h"
23#include "dlmglue.h"
24#include "file.h"
25#include "inode.h"
26#include "journal.h"
27#include "ocfs2_fs.h"
28
29#include "xattr.h"
30#include "acl.h"
31
32
33
34
35static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size)
36{
37 int n, count;
38 struct posix_acl *acl;
39
40 if (!value)
41 return NULL;
42 if (size < sizeof(struct posix_acl_entry))
43 return ERR_PTR(-EINVAL);
44
45 count = size / sizeof(struct posix_acl_entry);
46
47 acl = posix_acl_alloc(count, GFP_NOFS);
48 if (!acl)
49 return ERR_PTR(-ENOMEM);
50 for (n = 0; n < count; n++) {
51 struct ocfs2_acl_entry *entry =
52 (struct ocfs2_acl_entry *)value;
53
54 acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
55 acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
56 switch(acl->a_entries[n].e_tag) {
57 case ACL_USER:
58 acl->a_entries[n].e_uid =
59 make_kuid(&init_user_ns,
60 le32_to_cpu(entry->e_id));
61 break;
62 case ACL_GROUP:
63 acl->a_entries[n].e_gid =
64 make_kgid(&init_user_ns,
65 le32_to_cpu(entry->e_id));
66 break;
67 default:
68 break;
69 }
70 value += sizeof(struct posix_acl_entry);
71
72 }
73 return acl;
74}
75
76
77
78
79static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size)
80{
81 struct ocfs2_acl_entry *entry = NULL;
82 char *ocfs2_acl;
83 size_t n;
84
85 *size = acl->a_count * sizeof(struct posix_acl_entry);
86
87 ocfs2_acl = kmalloc(*size, GFP_NOFS);
88 if (!ocfs2_acl)
89 return ERR_PTR(-ENOMEM);
90
91 entry = (struct ocfs2_acl_entry *)ocfs2_acl;
92 for (n = 0; n < acl->a_count; n++, entry++) {
93 entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
94 entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
95 switch(acl->a_entries[n].e_tag) {
96 case ACL_USER:
97 entry->e_id = cpu_to_le32(
98 from_kuid(&init_user_ns,
99 acl->a_entries[n].e_uid));
100 break;
101 case ACL_GROUP:
102 entry->e_id = cpu_to_le32(
103 from_kgid(&init_user_ns,
104 acl->a_entries[n].e_gid));
105 break;
106 default:
107 entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
108 break;
109 }
110 }
111 return ocfs2_acl;
112}
113
114static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
115 int type,
116 struct buffer_head *di_bh)
117{
118 int name_index;
119 char *value = NULL;
120 struct posix_acl *acl;
121 int retval;
122
123 switch (type) {
124 case ACL_TYPE_ACCESS:
125 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
126 break;
127 case ACL_TYPE_DEFAULT:
128 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
129 break;
130 default:
131 return ERR_PTR(-EINVAL);
132 }
133
134 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "", NULL, 0);
135 if (retval > 0) {
136 value = kmalloc(retval, GFP_NOFS);
137 if (!value)
138 return ERR_PTR(-ENOMEM);
139 retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
140 "", value, retval);
141 }
142
143 if (retval > 0)
144 acl = ocfs2_acl_from_xattr(value, retval);
145 else if (retval == -ENODATA || retval == 0)
146 acl = NULL;
147 else
148 acl = ERR_PTR(retval);
149
150 kfree(value);
151
152 return acl;
153}
154
155
156
157
158
159
160static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
161 handle_t *handle, umode_t new_mode)
162{
163 int ret, commit_handle = 0;
164 struct ocfs2_dinode *di;
165
166 if (di_bh == NULL) {
167 ret = ocfs2_read_inode_block(inode, &di_bh);
168 if (ret) {
169 mlog_errno(ret);
170 goto out;
171 }
172 } else
173 get_bh(di_bh);
174
175 if (handle == NULL) {
176 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
177 OCFS2_INODE_UPDATE_CREDITS);
178 if (IS_ERR(handle)) {
179 ret = PTR_ERR(handle);
180 mlog_errno(ret);
181 goto out_brelse;
182 }
183
184 commit_handle = 1;
185 }
186
187 di = (struct ocfs2_dinode *)di_bh->b_data;
188 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
189 OCFS2_JOURNAL_ACCESS_WRITE);
190 if (ret) {
191 mlog_errno(ret);
192 goto out_commit;
193 }
194
195 inode->i_mode = new_mode;
196 inode->i_ctime = current_time(inode);
197 di->i_mode = cpu_to_le16(inode->i_mode);
198 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
199 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
200 ocfs2_update_inode_fsync_trans(handle, inode, 0);
201
202 ocfs2_journal_dirty(handle, di_bh);
203
204out_commit:
205 if (commit_handle)
206 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
207out_brelse:
208 brelse(di_bh);
209out:
210 return ret;
211}
212
213
214
215
216static int ocfs2_set_acl(handle_t *handle,
217 struct inode *inode,
218 struct buffer_head *di_bh,
219 int type,
220 struct posix_acl *acl,
221 struct ocfs2_alloc_context *meta_ac,
222 struct ocfs2_alloc_context *data_ac)
223{
224 int name_index;
225 void *value = NULL;
226 size_t size = 0;
227 int ret;
228
229 if (S_ISLNK(inode->i_mode))
230 return -EOPNOTSUPP;
231
232 switch (type) {
233 case ACL_TYPE_ACCESS:
234 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
235 break;
236 case ACL_TYPE_DEFAULT:
237 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
238 if (!S_ISDIR(inode->i_mode))
239 return acl ? -EACCES : 0;
240 break;
241 default:
242 return -EINVAL;
243 }
244
245 if (acl) {
246 value = ocfs2_acl_to_xattr(acl, &size);
247 if (IS_ERR(value))
248 return (int)PTR_ERR(value);
249 }
250
251 if (handle)
252 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
253 "", value, size, 0,
254 meta_ac, data_ac);
255 else
256 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
257
258 kfree(value);
259 if (!ret)
260 set_cached_acl(inode, type, acl);
261
262 return ret;
263}
264
265int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
266{
267 struct buffer_head *bh = NULL;
268 int status, had_lock;
269 struct ocfs2_lock_holder oh;
270
271 had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
272 if (had_lock < 0)
273 return had_lock;
274 if (type == ACL_TYPE_ACCESS && acl) {
275 umode_t mode;
276
277 status = posix_acl_update_mode(inode, &mode, &acl);
278 if (status)
279 goto unlock;
280
281 status = ocfs2_acl_set_mode(inode, bh, NULL, mode);
282 if (status)
283 goto unlock;
284 }
285 status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
286unlock:
287 ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
288 brelse(bh);
289 return status;
290}
291
292struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
293{
294 struct ocfs2_super *osb;
295 struct buffer_head *di_bh = NULL;
296 struct posix_acl *acl;
297 int had_lock;
298 struct ocfs2_lock_holder oh;
299
300 osb = OCFS2_SB(inode->i_sb);
301 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
302 return NULL;
303
304 had_lock = ocfs2_inode_lock_tracker(inode, &di_bh, 0, &oh);
305 if (had_lock < 0)
306 return ERR_PTR(had_lock);
307
308 down_read(&OCFS2_I(inode)->ip_xattr_sem);
309 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
310 up_read(&OCFS2_I(inode)->ip_xattr_sem);
311
312 ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
313 brelse(di_bh);
314 return acl;
315}
316
317int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
318{
319 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
320 struct posix_acl *acl;
321 int ret;
322
323 if (S_ISLNK(inode->i_mode))
324 return -EOPNOTSUPP;
325
326 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
327 return 0;
328
329 down_read(&OCFS2_I(inode)->ip_xattr_sem);
330 acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
331 up_read(&OCFS2_I(inode)->ip_xattr_sem);
332 if (IS_ERR_OR_NULL(acl))
333 return PTR_ERR_OR_ZERO(acl);
334 ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
335 if (ret)
336 return ret;
337 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
338 acl, NULL, NULL);
339 posix_acl_release(acl);
340 return ret;
341}
342
343
344
345
346
347int ocfs2_init_acl(handle_t *handle,
348 struct inode *inode,
349 struct inode *dir,
350 struct buffer_head *di_bh,
351 struct buffer_head *dir_bh,
352 struct ocfs2_alloc_context *meta_ac,
353 struct ocfs2_alloc_context *data_ac)
354{
355 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
356 struct posix_acl *acl = NULL;
357 int ret = 0, ret2;
358 umode_t mode;
359
360 if (!S_ISLNK(inode->i_mode)) {
361 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
362 down_read(&OCFS2_I(dir)->ip_xattr_sem);
363 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
364 dir_bh);
365 up_read(&OCFS2_I(dir)->ip_xattr_sem);
366 if (IS_ERR(acl))
367 return PTR_ERR(acl);
368 }
369 if (!acl) {
370 mode = inode->i_mode & ~current_umask();
371 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
372 if (ret) {
373 mlog_errno(ret);
374 goto cleanup;
375 }
376 }
377 }
378 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
379 if (S_ISDIR(inode->i_mode)) {
380 ret = ocfs2_set_acl(handle, inode, di_bh,
381 ACL_TYPE_DEFAULT, acl,
382 meta_ac, data_ac);
383 if (ret)
384 goto cleanup;
385 }
386 mode = inode->i_mode;
387 ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
388 if (ret < 0)
389 return ret;
390
391 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
392 if (ret2) {
393 mlog_errno(ret2);
394 ret = ret2;
395 goto cleanup;
396 }
397 if (ret > 0) {
398 ret = ocfs2_set_acl(handle, inode,
399 di_bh, ACL_TYPE_ACCESS,
400 acl, meta_ac, data_ac);
401 }
402 }
403cleanup:
404 posix_acl_release(acl);
405 return ret;
406}
407
