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12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/string.h>
16
17#include <cluster/masklog.h>
18
19#include "ocfs2.h"
20#include "alloc.h"
21#include "dlmglue.h"
22#include "file.h"
23#include "inode.h"
24#include "journal.h"
25#include "ocfs2_fs.h"
26
27#include "xattr.h"
28#include "acl.h"
29
30
31
32
33static 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);
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);
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 }
68 value += sizeof(struct posix_acl_entry);
69
70 }
71 return acl;
72}
73
74
75
76
77static 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);
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 }
108 }
109 return ocfs2_acl;
110}
111
112static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
113 int type,
114 struct buffer_head *di_bh)
115{
116 int name_index;
117 char *value = NULL;
118 struct posix_acl *acl;
119 int retval;
120
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
153
154
155
156
157
158static 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;
194 inode->i_ctime = current_time(inode);
195 di->i_mode = cpu_to_le16(inode->i_mode);
196 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
197 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
198 ocfs2_update_inode_fsync_trans(handle, inode, 0);
199
200 ocfs2_journal_dirty(handle, di_bh);
201
202out_commit:
203 if (commit_handle)
204 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
205out_brelse:
206 brelse(di_bh);
207out:
208 return ret;
209}
210
211
212
213
214static int ocfs2_set_acl(handle_t *handle,
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;
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);
257 if (!ret)
258 set_cached_acl(inode, type, acl);
259
260 return ret;
261}
262
263int ocfs2_iop_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
264 struct posix_acl *acl, int type)
265{
266 struct buffer_head *bh = NULL;
267 int status, had_lock;
268 struct ocfs2_lock_holder oh;
269
270 had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
271 if (had_lock < 0)
272 return had_lock;
273 if (type == ACL_TYPE_ACCESS && acl) {
274 umode_t mode;
275
276 status = posix_acl_update_mode(&init_user_ns, inode, &mode,
277 &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
