[SCSI] mpt2sas: Fix for Panic when inactive volume is tried deleting
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / acl.c
blob65978d7885c863b896e7da2ca04062498c449ac2
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/xattr.h>
16 #include <linux/posix_acl.h>
17 #include <linux/posix_acl_xattr.h>
18 #include <linux/gfs2_ondisk.h>
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "acl.h"
23 #include "xattr.h"
24 #include "glock.h"
25 #include "inode.h"
26 #include "meta_io.h"
27 #include "trans.h"
28 #include "util.h"
30 static const char *gfs2_acl_name(int type)
32 switch (type) {
33 case ACL_TYPE_ACCESS:
34 return GFS2_POSIX_ACL_ACCESS;
35 case ACL_TYPE_DEFAULT:
36 return GFS2_POSIX_ACL_DEFAULT;
38 return NULL;
41 static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)
43 struct posix_acl *acl;
44 const char *name;
45 char *data;
46 int len;
48 if (!ip->i_eattr)
49 return NULL;
51 acl = get_cached_acl(&ip->i_inode, type);
52 if (acl != ACL_NOT_CACHED)
53 return acl;
55 name = gfs2_acl_name(type);
56 if (name == NULL)
57 return ERR_PTR(-EINVAL);
59 len = gfs2_xattr_acl_get(ip, name, &data);
60 if (len < 0)
61 return ERR_PTR(len);
62 if (len == 0)
63 return NULL;
65 acl = posix_acl_from_xattr(data, len);
66 kfree(data);
67 return acl;
70 struct posix_acl *gfs2_get_acl(struct inode *inode, int type)
72 return gfs2_acl_get(GFS2_I(inode), type);
75 static int gfs2_set_mode(struct inode *inode, umode_t mode)
77 int error = 0;
79 if (mode != inode->i_mode) {
80 struct iattr iattr;
82 iattr.ia_valid = ATTR_MODE;
83 iattr.ia_mode = mode;
85 error = gfs2_setattr_simple(inode, &iattr);
88 return error;
91 static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl)
93 int error;
94 int len;
95 char *data;
96 const char *name = gfs2_acl_name(type);
98 BUG_ON(name == NULL);
99 len = posix_acl_to_xattr(acl, NULL, 0);
100 if (len == 0)
101 return 0;
102 data = kmalloc(len, GFP_NOFS);
103 if (data == NULL)
104 return -ENOMEM;
105 error = posix_acl_to_xattr(acl, data, len);
106 if (error < 0)
107 goto out;
108 error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS);
109 if (!error)
110 set_cached_acl(inode, type, acl);
111 out:
112 kfree(data);
113 return error;
116 int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode)
118 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
119 struct posix_acl *acl;
120 umode_t mode = inode->i_mode;
121 int error = 0;
123 if (!sdp->sd_args.ar_posix_acl)
124 return 0;
125 if (S_ISLNK(inode->i_mode))
126 return 0;
128 acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT);
129 if (IS_ERR(acl))
130 return PTR_ERR(acl);
131 if (!acl) {
132 mode &= ~current_umask();
133 if (mode != inode->i_mode)
134 error = gfs2_set_mode(inode, mode);
135 return error;
138 if (S_ISDIR(inode->i_mode)) {
139 error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl);
140 if (error)
141 goto out;
144 error = posix_acl_create(&acl, GFP_NOFS, &mode);
145 if (error < 0)
146 return error;
148 if (error == 0)
149 goto munge;
151 error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl);
152 if (error)
153 goto out;
154 munge:
155 error = gfs2_set_mode(inode, mode);
156 out:
157 posix_acl_release(acl);
158 return error;
161 int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
163 struct inode *inode = &ip->i_inode;
164 struct posix_acl *acl;
165 char *data;
166 unsigned int len;
167 int error;
169 acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS);
170 if (IS_ERR(acl))
171 return PTR_ERR(acl);
172 if (!acl)
173 return gfs2_setattr_simple(inode, attr);
175 error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode);
176 if (error)
177 return error;
179 len = posix_acl_to_xattr(acl, NULL, 0);
180 data = kmalloc(len, GFP_NOFS);
181 error = -ENOMEM;
182 if (data == NULL)
183 goto out;
184 posix_acl_to_xattr(acl, data, len);
185 error = gfs2_xattr_acl_chmod(ip, attr, data);
186 kfree(data);
187 set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl);
189 out:
190 posix_acl_release(acl);
191 return error;
194 static int gfs2_acl_type(const char *name)
196 if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0)
197 return ACL_TYPE_ACCESS;
198 if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0)
199 return ACL_TYPE_DEFAULT;
200 return -EINVAL;
203 static int gfs2_xattr_system_get(struct dentry *dentry, const char *name,
204 void *buffer, size_t size, int xtype)
206 struct inode *inode = dentry->d_inode;
207 struct gfs2_sbd *sdp = GFS2_SB(inode);
208 struct posix_acl *acl;
209 int type;
210 int error;
212 if (!sdp->sd_args.ar_posix_acl)
213 return -EOPNOTSUPP;
215 type = gfs2_acl_type(name);
216 if (type < 0)
217 return type;
219 acl = gfs2_acl_get(GFS2_I(inode), type);
220 if (IS_ERR(acl))
221 return PTR_ERR(acl);
222 if (acl == NULL)
223 return -ENODATA;
225 error = posix_acl_to_xattr(acl, buffer, size);
226 posix_acl_release(acl);
228 return error;
231 static int gfs2_xattr_system_set(struct dentry *dentry, const char *name,
232 const void *value, size_t size, int flags,
233 int xtype)
235 struct inode *inode = dentry->d_inode;
236 struct gfs2_sbd *sdp = GFS2_SB(inode);
237 struct posix_acl *acl = NULL;
238 int error = 0, type;
240 if (!sdp->sd_args.ar_posix_acl)
241 return -EOPNOTSUPP;
243 type = gfs2_acl_type(name);
244 if (type < 0)
245 return type;
246 if (flags & XATTR_CREATE)
247 return -EINVAL;
248 if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
249 return value ? -EACCES : 0;
250 if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER))
251 return -EPERM;
252 if (S_ISLNK(inode->i_mode))
253 return -EOPNOTSUPP;
255 if (!value)
256 goto set_acl;
258 acl = posix_acl_from_xattr(value, size);
259 if (!acl) {
261 * acl_set_file(3) may request that we set default ACLs with
262 * zero length -- defend (gracefully) against that here.
264 goto out;
266 if (IS_ERR(acl)) {
267 error = PTR_ERR(acl);
268 goto out;
271 error = posix_acl_valid(acl);
272 if (error)
273 goto out_release;
275 error = -EINVAL;
276 if (acl->a_count > GFS2_ACL_MAX_ENTRIES)
277 goto out_release;
279 if (type == ACL_TYPE_ACCESS) {
280 umode_t mode = inode->i_mode;
281 error = posix_acl_equiv_mode(acl, &mode);
283 if (error <= 0) {
284 posix_acl_release(acl);
285 acl = NULL;
287 if (error < 0)
288 return error;
291 error = gfs2_set_mode(inode, mode);
292 if (error)
293 goto out_release;
296 set_acl:
297 error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS);
298 if (!error) {
299 if (acl)
300 set_cached_acl(inode, type, acl);
301 else
302 forget_cached_acl(inode, type);
304 out_release:
305 posix_acl_release(acl);
306 out:
307 return error;
310 const struct xattr_handler gfs2_xattr_system_handler = {
311 .prefix = XATTR_SYSTEM_PREFIX,
312 .flags = GFS2_EATYPE_SYS,
313 .get = gfs2_xattr_system_get,
314 .set = gfs2_xattr_system_set,