Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
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> | |
2646a1f6 | 15 | #include <linux/xattr.h> |
b3b94faa DT |
16 | #include <linux/posix_acl.h> |
17 | #include <linux/posix_acl_xattr.h> | |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d | 21 | #include "incore.h" |
b3b94faa | 22 | #include "acl.h" |
307cf6e6 | 23 | #include "xattr.h" |
b3b94faa DT |
24 | #include "glock.h" |
25 | #include "inode.h" | |
26 | #include "meta_io.h" | |
27 | #include "trans.h" | |
5c676f6d | 28 | #include "util.h" |
b3b94faa | 29 | |
479c427d | 30 | static const char *gfs2_acl_name(int type) |
b3b94faa | 31 | { |
479c427d SW |
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; | |
37 | } | |
38 | return NULL; | |
39 | } | |
b3b94faa | 40 | |
479c427d SW |
41 | static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type) |
42 | { | |
43 | struct posix_acl *acl; | |
44 | const char *name; | |
45 | char *data; | |
46 | int len; | |
40b78a32 | 47 | |
3767ac21 | 48 | if (!ip->i_eattr) |
479c427d | 49 | return NULL; |
b3b94faa | 50 | |
106381bf SW |
51 | acl = get_cached_acl(&ip->i_inode, type); |
52 | if (acl != ACL_NOT_CACHED) | |
53 | return acl; | |
54 | ||
479c427d SW |
55 | name = gfs2_acl_name(type); |
56 | if (name == NULL) | |
57 | return ERR_PTR(-EINVAL); | |
b3b94faa | 58 | |
479c427d SW |
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; | |
b3b94faa | 64 | |
479c427d SW |
65 | acl = posix_acl_from_xattr(data, len); |
66 | kfree(data); | |
67 | return acl; | |
b3b94faa DT |
68 | } |
69 | ||
4e34e719 | 70 | struct posix_acl *gfs2_get_acl(struct inode *inode, int type) |
b3b94faa | 71 | { |
4e34e719 | 72 | return gfs2_acl_get(GFS2_I(inode), type); |
b3b94faa DT |
73 | } |
74 | ||
d3fb6120 | 75 | static int gfs2_set_mode(struct inode *inode, umode_t mode) |
b3b94faa | 76 | { |
69dca424 | 77 | int error = 0; |
b3b94faa | 78 | |
69dca424 SW |
79 | if (mode != inode->i_mode) { |
80 | struct iattr iattr; | |
b3b94faa | 81 | |
69dca424 SW |
82 | iattr.ia_valid = ATTR_MODE; |
83 | iattr.ia_mode = mode; | |
b3b94faa | 84 | |
ab9bbda0 | 85 | error = gfs2_setattr_simple(inode, &iattr); |
69dca424 | 86 | } |
b3b94faa | 87 | |
69dca424 | 88 | return error; |
b3b94faa DT |
89 | } |
90 | ||
479c427d | 91 | static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) |
b3b94faa | 92 | { |
b3b94faa | 93 | int error; |
479c427d SW |
94 | int len; |
95 | char *data; | |
96 | const char *name = gfs2_acl_name(type); | |
97 | ||
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; | |
431547b3 | 108 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); |
106381bf SW |
109 | if (!error) |
110 | set_cached_acl(inode, type, acl); | |
479c427d SW |
111 | out: |
112 | kfree(data); | |
113 | return error; | |
114 | } | |
115 | ||
116 | int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) | |
117 | { | |
118 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
826cae2f | 119 | struct posix_acl *acl; |
d3fb6120 | 120 | umode_t mode = inode->i_mode; |
479c427d | 121 | int error = 0; |
b3b94faa DT |
122 | |
123 | if (!sdp->sd_args.ar_posix_acl) | |
124 | return 0; | |
479c427d | 125 | if (S_ISLNK(inode->i_mode)) |
b3b94faa DT |
126 | return 0; |
127 | ||
479c427d SW |
128 | acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT); |
129 | if (IS_ERR(acl)) | |
130 | return PTR_ERR(acl); | |
b3b94faa | 131 | if (!acl) { |
ce3b0f8d | 132 | mode &= ~current_umask(); |
479c427d SW |
133 | if (mode != inode->i_mode) |
134 | error = gfs2_set_mode(inode, mode); | |
b3b94faa DT |
135 | return error; |
136 | } | |
137 | ||
479c427d SW |
138 | if (S_ISDIR(inode->i_mode)) { |
139 | error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); | |
140 | if (error) | |
141 | goto out; | |
142 | } | |
143 | ||
826cae2f | 144 | error = posix_acl_create(&acl, GFP_NOFS, &mode); |
b3b94faa | 145 | if (error < 0) |
826cae2f AV |
146 | return error; |
147 | ||
40b78a32 SW |
148 | if (error == 0) |
149 | goto munge; | |
b3b94faa | 150 | |
479c427d | 151 | error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); |
40b78a32 SW |
152 | if (error) |
153 | goto out; | |
154 | munge: | |
479c427d | 155 | error = gfs2_set_mode(inode, mode); |
a91ea69f | 156 | out: |
b3b94faa | 157 | posix_acl_release(acl); |
b3b94faa DT |
158 | return error; |
159 | } | |
160 | ||
161 | int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) | |
162 | { | |
ab9bbda0 | 163 | struct inode *inode = &ip->i_inode; |
bc26ab5f | 164 | struct posix_acl *acl; |
b3b94faa DT |
165 | char *data; |
166 | unsigned int len; | |
167 | int error; | |
168 | ||
479c427d SW |
169 | acl = gfs2_acl_get(ip, ACL_TYPE_ACCESS); |
170 | if (IS_ERR(acl)) | |
171 | return PTR_ERR(acl); | |
b3b94faa | 172 | if (!acl) |
ab9bbda0 | 173 | return gfs2_setattr_simple(inode, attr); |
b3b94faa | 174 | |
bc26ab5f AV |
175 | error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode); |
176 | if (error) | |
177 | return error; | |
178 | ||
179 | len = posix_acl_to_xattr(acl, NULL, 0); | |
180 | data = kmalloc(len, GFP_NOFS); | |
b3b94faa | 181 | error = -ENOMEM; |
bc26ab5f | 182 | if (data == NULL) |
b3b94faa | 183 | goto out; |
bc26ab5f AV |
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); | |
b3b94faa | 188 | |
a91ea69f | 189 | out: |
b3b94faa | 190 | posix_acl_release(acl); |
b3b94faa DT |
191 | return error; |
192 | } | |
193 | ||
2646a1f6 SW |
194 | static int gfs2_acl_type(const char *name) |
195 | { | |
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; | |
201 | } | |
202 | ||
431547b3 CH |
203 | static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, |
204 | void *buffer, size_t size, int xtype) | |
2646a1f6 | 205 | { |
431547b3 | 206 | struct inode *inode = dentry->d_inode; |
f72f2d2e | 207 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
106381bf | 208 | struct posix_acl *acl; |
2646a1f6 | 209 | int type; |
106381bf | 210 | int error; |
2646a1f6 | 211 | |
f72f2d2e SW |
212 | if (!sdp->sd_args.ar_posix_acl) |
213 | return -EOPNOTSUPP; | |
214 | ||
2646a1f6 SW |
215 | type = gfs2_acl_type(name); |
216 | if (type < 0) | |
217 | return type; | |
218 | ||
106381bf SW |
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; | |
2646a1f6 | 224 | |
106381bf SW |
225 | error = posix_acl_to_xattr(acl, buffer, size); |
226 | posix_acl_release(acl); | |
227 | ||
228 | return error; | |
229 | } | |
2646a1f6 | 230 | |
431547b3 CH |
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) | |
2646a1f6 | 234 | { |
431547b3 | 235 | struct inode *inode = dentry->d_inode; |
2646a1f6 SW |
236 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
237 | struct posix_acl *acl = NULL; | |
238 | int error = 0, type; | |
239 | ||
240 | if (!sdp->sd_args.ar_posix_acl) | |
241 | return -EOPNOTSUPP; | |
242 | ||
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; | |
254 | ||
255 | if (!value) | |
256 | goto set_acl; | |
257 | ||
258 | acl = posix_acl_from_xattr(value, size); | |
259 | if (!acl) { | |
260 | /* | |
261 | * acl_set_file(3) may request that we set default ACLs with | |
262 | * zero length -- defend (gracefully) against that here. | |
263 | */ | |
264 | goto out; | |
265 | } | |
266 | if (IS_ERR(acl)) { | |
267 | error = PTR_ERR(acl); | |
268 | goto out; | |
269 | } | |
270 | ||
271 | error = posix_acl_valid(acl); | |
272 | if (error) | |
273 | goto out_release; | |
274 | ||
275 | error = -EINVAL; | |
276 | if (acl->a_count > GFS2_ACL_MAX_ENTRIES) | |
277 | goto out_release; | |
278 | ||
279 | if (type == ACL_TYPE_ACCESS) { | |
d6952123 | 280 | umode_t mode = inode->i_mode; |
2646a1f6 SW |
281 | error = posix_acl_equiv_mode(acl, &mode); |
282 | ||
283 | if (error <= 0) { | |
284 | posix_acl_release(acl); | |
285 | acl = NULL; | |
286 | ||
287 | if (error < 0) | |
288 | return error; | |
289 | } | |
290 | ||
291 | error = gfs2_set_mode(inode, mode); | |
292 | if (error) | |
293 | goto out_release; | |
294 | } | |
295 | ||
296 | set_acl: | |
431547b3 | 297 | error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); |
106381bf SW |
298 | if (!error) { |
299 | if (acl) | |
300 | set_cached_acl(inode, type, acl); | |
301 | else | |
302 | forget_cached_acl(inode, type); | |
303 | } | |
2646a1f6 SW |
304 | out_release: |
305 | posix_acl_release(acl); | |
306 | out: | |
307 | return error; | |
308 | } | |
309 | ||
b7bb0a12 | 310 | const struct xattr_handler gfs2_xattr_system_handler = { |
2646a1f6 | 311 | .prefix = XATTR_SYSTEM_PREFIX, |
431547b3 | 312 | .flags = GFS2_EATYPE_SYS, |
2646a1f6 SW |
313 | .get = gfs2_xattr_system_get, |
314 | .set = gfs2_xattr_system_set, | |
315 | }; | |
316 |