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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>
24#include <linux/slab.h>
25#include <linux/string.h>
26
27#include <cluster/masklog.h>
28
29#include "ocfs2.h"
30#include "alloc.h"
31#include "dlmglue.h"
32#include "file.h"
33#include "inode.h"
34#include "journal.h"
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 */
43static 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);
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);
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 }
78 value += sizeof(struct posix_acl_entry);
79
80 }
81 return acl;
82}
83
84/*
85 * Convert acl struct to xattr value.
86 */
87static 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);
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 }
118 }
119 return ocfs2_acl;
120}
121
122static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
123 int type,
124 struct buffer_head *di_bh)
125{
126 int name_index;
127 char *value = NULL;
128 struct posix_acl *acl;
129 int retval;
130
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 * Helper function to set i_mode in memory and disk. Some call paths
165 * will not have di_bh or a journal handle to pass, in which case it
166 * will create it's own.
167 */
168static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
169 handle_t *handle, umode_t new_mode)
170{
171 int ret, commit_handle = 0;
172 struct ocfs2_dinode *di;
173
174 if (di_bh == NULL) {
175 ret = ocfs2_read_inode_block(inode, &di_bh);
176 if (ret) {
177 mlog_errno(ret);
178 goto out;
179 }
180 } else
181 get_bh(di_bh);
182
183 if (handle == NULL) {
184 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
185 OCFS2_INODE_UPDATE_CREDITS);
186 if (IS_ERR(handle)) {
187 ret = PTR_ERR(handle);
188 mlog_errno(ret);
189 goto out_brelse;
190 }
191
192 commit_handle = 1;
193 }
194
195 di = (struct ocfs2_dinode *)di_bh->b_data;
196 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
197 OCFS2_JOURNAL_ACCESS_WRITE);
198 if (ret) {
199 mlog_errno(ret);
200 goto out_commit;
201 }
202
203 inode->i_mode = new_mode;
204 inode->i_ctime = current_time(inode);
205 di->i_mode = cpu_to_le16(inode->i_mode);
206 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
207 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
208 ocfs2_update_inode_fsync_trans(handle, inode, 0);
209
210 ocfs2_journal_dirty(handle, di_bh);
211
212out_commit:
213 if (commit_handle)
214 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
215out_brelse:
216 brelse(di_bh);
217out:
218 return ret;
219}
220
221/*
222 * Set the access or default ACL of an inode.
223 */
224int ocfs2_set_acl(handle_t *handle,
225 struct inode *inode,
226 struct buffer_head *di_bh,
227 int type,
228 struct posix_acl *acl,
229 struct ocfs2_alloc_context *meta_ac,
230 struct ocfs2_alloc_context *data_ac)
231{
232 int name_index;
233 void *value = NULL;
234 size_t size = 0;
235 int ret;
236
237 if (S_ISLNK(inode->i_mode))
238 return -EOPNOTSUPP;
239
240 switch (type) {
241 case ACL_TYPE_ACCESS:
242 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
243 if (acl) {
244 umode_t mode;
245
246 ret = posix_acl_update_mode(inode, &mode, &acl);
247 if (ret)
248 return ret;
249
250 ret = ocfs2_acl_set_mode(inode, di_bh,
251 handle, mode);
252 if (ret)
253 return ret;
254 }
255 break;
256 case ACL_TYPE_DEFAULT:
257 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
258 if (!S_ISDIR(inode->i_mode))
259 return acl ? -EACCES : 0;
260 break;
261 default:
262 return -EINVAL;
263 }
264
265 if (acl) {
266 value = ocfs2_acl_to_xattr(acl, &size);
267 if (IS_ERR(value))
268 return (int)PTR_ERR(value);
269 }
270
271 if (handle)
272 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
273 "", value, size, 0,
274 meta_ac, data_ac);
275 else
276 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
277
278 kfree(value);
279
280 return ret;
281}
282
283int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
284{
285 struct buffer_head *bh = NULL;
286 int status = 0;
287
288 status = ocfs2_inode_lock(inode, &bh, 1);
289 if (status < 0) {
290 if (status != -ENOENT)
291 mlog_errno(status);
292 return status;
293 }
294 status = ocfs2_set_acl(NULL, inode, bh, type, acl, NULL, NULL);
295 ocfs2_inode_unlock(inode, 1);
296 brelse(bh);
297 return status;
298}
299
300struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type)
301{
302 struct ocfs2_super *osb;
303 struct buffer_head *di_bh = NULL;
304 struct posix_acl *acl;
305 int ret;
306
307 osb = OCFS2_SB(inode->i_sb);
308 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
309 return NULL;
310 ret = ocfs2_inode_lock(inode, &di_bh, 0);
311 if (ret < 0) {
312 if (ret != -ENOENT)
313 mlog_errno(ret);
314 return ERR_PTR(ret);
315 }
316
317 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
318
319 ocfs2_inode_unlock(inode, 0);
320 brelse(di_bh);
321 return acl;
322}
323
324int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh)
325{
326 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
327 struct posix_acl *acl;
328 int ret;
329
330 if (S_ISLNK(inode->i_mode))
331 return -EOPNOTSUPP;
332
333 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
334 return 0;
335
336 acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, bh);
337 if (IS_ERR(acl) || !acl)
338 return PTR_ERR(acl);
339 ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
340 if (ret)
341 return ret;
342 ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
343 acl, NULL, NULL);
344 posix_acl_release(acl);
345 return ret;
346}
347
348/*
349 * Initialize the ACLs of a new inode. If parent directory has default ACL,
350 * then clone to new inode. Called from ocfs2_mknod.
351 */
352int ocfs2_init_acl(handle_t *handle,
353 struct inode *inode,
354 struct inode *dir,
355 struct buffer_head *di_bh,
356 struct buffer_head *dir_bh,
357 struct ocfs2_alloc_context *meta_ac,
358 struct ocfs2_alloc_context *data_ac)
359{
360 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
361 struct posix_acl *acl = NULL;
362 int ret = 0, ret2;
363 umode_t mode;
364
365 if (!S_ISLNK(inode->i_mode)) {
366 if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
367 acl = ocfs2_get_acl_nolock(dir, ACL_TYPE_DEFAULT,
368 dir_bh);
369 if (IS_ERR(acl))
370 return PTR_ERR(acl);
371 }
372 if (!acl) {
373 mode = inode->i_mode & ~current_umask();
374 ret = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
375 if (ret) {
376 mlog_errno(ret);
377 goto cleanup;
378 }
379 }
380 }
381 if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) {
382 if (S_ISDIR(inode->i_mode)) {
383 ret = ocfs2_set_acl(handle, inode, di_bh,
384 ACL_TYPE_DEFAULT, acl,
385 meta_ac, data_ac);
386 if (ret)
387 goto cleanup;
388 }
389 mode = inode->i_mode;
390 ret = __posix_acl_create(&acl, GFP_NOFS, &mode);
391 if (ret < 0)
392 return ret;
393
394 ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, mode);
395 if (ret2) {
396 mlog_errno(ret2);
397 ret = ret2;
398 goto cleanup;
399 }
400 if (ret > 0) {
401 ret = ocfs2_set_acl(handle, inode,
402 di_bh, ACL_TYPE_ACCESS,
403 acl, meta_ac, data_ac);
404 }
405 }
406cleanup:
407 posix_acl_release(acl);
408 return ret;
409}
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>
24#include <linux/slab.h>
25#include <linux/string.h>
26
27#include <cluster/masklog.h>
28
29#include "ocfs2.h"
30#include "alloc.h"
31#include "dlmglue.h"
32#include "file.h"
33#include "inode.h"
34#include "journal.h"
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 */
43static 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);
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);
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 }
78 value += sizeof(struct posix_acl_entry);
79
80 }
81 return acl;
82}
83
84/*
85 * Convert acl struct to xattr value.
86 */
87static 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);
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 }
118 }
119 return ocfs2_acl;
120}
121
122static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode,
123 int type,
124 struct buffer_head *di_bh)
125{
126 int name_index;
127 char *value = NULL;
128 struct posix_acl *acl;
129 int retval;
130
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 * Helper function to set i_mode in memory and disk. Some call paths
165 * will not have di_bh or a journal handle to pass, in which case it
166 * will create it's own.
167 */
168static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh,
169 handle_t *handle, umode_t new_mode)
170{
171 int ret, commit_handle = 0;
172 struct ocfs2_dinode *di;
173
174 if (di_bh == NULL) {
175 ret = ocfs2_read_inode_block(inode, &di_bh);
176 if (ret) {
177 mlog_errno(ret);
178 goto out;
179 }
180 } else
181 get_bh(di_bh);
182
183 if (handle == NULL) {
184 handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb),
185 OCFS2_INODE_UPDATE_CREDITS);
186 if (IS_ERR(handle)) {
187 ret = PTR_ERR(handle);
188 mlog_errno(ret);
189 goto out_brelse;
190 }
191
192 commit_handle = 1;
193 }
194
195 di = (struct ocfs2_dinode *)di_bh->b_data;
196 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
197 OCFS2_JOURNAL_ACCESS_WRITE);
198 if (ret) {
199 mlog_errno(ret);
200 goto out_commit;
201 }
202
203 inode->i_mode = new_mode;
204 inode->i_ctime = CURRENT_TIME;
205 di->i_mode = cpu_to_le16(inode->i_mode);
206 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
207 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
208 ocfs2_update_inode_fsync_trans(handle, inode, 0);
209
210 ocfs2_journal_dirty(handle, di_bh);
211
212out_commit:
213 if (commit_handle)
214 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
215out_brelse:
216 brelse(di_bh);
217out:
218 return ret;
219}
220
221/*
222 * Set the access or default ACL of an inode.
223 */
224int ocfs2_set_acl(handle_t *handle,
225 struct inode *inode,
226 struct buffer_head *di_bh,
227 int type,
228 struct posix_acl *acl,
229 struct ocfs2_alloc_context *meta_ac,
230 struct ocfs2_alloc_context *data_ac)
231{
232 int name_index;
233 void *value = NULL;
234 size_t size = 0;
235 int ret;
236
237 if (S_ISLNK(inode->i_mode))
238 return -EOPNOTSUPP;
239
240 switch (type) {
241 case ACL_TYPE_ACCESS:
242 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS;
243 if (acl) {
244 umode_t mode = inode->i_mode;
245 ret = posix_acl_equiv_mode(acl, &mode);
246 if (ret < 0)
247 return ret;
248 else {
249 if (ret == 0)
250 acl = NULL;
251
252 ret = ocfs2_acl_set_mode(inode, di_bh,
253 handle, mode);
254 if (ret)
255 return ret;
256
257 }
258 }
259 break;
260 case ACL_TYPE_DEFAULT:
261 name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
262 if (!S_ISDIR(inode->i_mode))
263 return acl ? -EACCES : 0;
264 break;
265 default:
266 return -EINVAL;
267 }
268
269 if (acl) {
270 value = ocfs2_acl_to_xattr(acl, &size);
271 if (IS_ERR(value))
272 return (int)PTR_ERR(value);
273 }
274
275 if (handle)
276 ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index,
277 "", value, size, 0,
278 meta_ac, data_ac);
279 else
280 ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
281
282 kfree(value);
283
284 return ret;
285}
286
287int ocfs2_iop_set_acl(struct inode *inode, struct posix_acl *acl, int type)
288{
289 return ocfs2_set_acl(NULL, inode, NULL, type, acl, NULL, NULL);
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 ret = -EAGAIN;
298
299 osb = OCFS2_SB(inode->i_sb);
300 if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
301 return NULL;
302
303 ret = ocfs2_read_inode_block(inode, &di_bh);
304 if (ret < 0)
305 return ERR_PTR(ret);
306
307 acl = ocfs2_get_acl_nolock(inode, type, di_bh);
308
309 brelse(di_bh);
310
311 return acl;
312}