Commit | Line | Data |
---|---|---|
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 | |
018a01cd | 41 | struct posix_acl *gfs2_get_acl(struct inode *inode, int type) |
479c427d | 42 | { |
018a01cd | 43 | struct gfs2_inode *ip = GFS2_I(inode); |
479c427d SW |
44 | struct posix_acl *acl; |
45 | const char *name; | |
46 | char *data; | |
47 | int len; | |
40b78a32 | 48 | |
3767ac21 | 49 | if (!ip->i_eattr) |
479c427d | 50 | return NULL; |
b3b94faa | 51 | |
106381bf SW |
52 | acl = get_cached_acl(&ip->i_inode, type); |
53 | if (acl != ACL_NOT_CACHED) | |
54 | return acl; | |
55 | ||
479c427d SW |
56 | name = gfs2_acl_name(type); |
57 | if (name == NULL) | |
58 | return ERR_PTR(-EINVAL); | |
b3b94faa | 59 | |
479c427d SW |
60 | len = gfs2_xattr_acl_get(ip, name, &data); |
61 | if (len < 0) | |
62 | return ERR_PTR(len); | |
63 | if (len == 0) | |
64 | return NULL; | |
b3b94faa | 65 | |
479c427d SW |
66 | acl = posix_acl_from_xattr(data, len); |
67 | kfree(data); | |
68 | return acl; | |
b3b94faa DT |
69 | } |
70 | ||
d3fb6120 | 71 | static int gfs2_set_mode(struct inode *inode, umode_t mode) |
b3b94faa | 72 | { |
69dca424 | 73 | int error = 0; |
b3b94faa | 74 | |
69dca424 SW |
75 | if (mode != inode->i_mode) { |
76 | struct iattr iattr; | |
b3b94faa | 77 | |
69dca424 SW |
78 | iattr.ia_valid = ATTR_MODE; |
79 | iattr.ia_mode = mode; | |
b3b94faa | 80 | |
ab9bbda0 | 81 | error = gfs2_setattr_simple(inode, &iattr); |
69dca424 | 82 | } |
b3b94faa | 83 | |
69dca424 | 84 | return error; |
b3b94faa DT |
85 | } |
86 | ||
479c427d | 87 | static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) |
b3b94faa | 88 | { |
b3b94faa | 89 | int error; |
479c427d SW |
90 | int len; |
91 | char *data; | |
92 | const char *name = gfs2_acl_name(type); | |
93 | ||
94 | BUG_ON(name == NULL); | |
95 | len = posix_acl_to_xattr(acl, NULL, 0); | |
96 | if (len == 0) | |
97 | return 0; | |
98 | data = kmalloc(len, GFP_NOFS); | |
99 | if (data == NULL) | |
100 | return -ENOMEM; | |
101 | error = posix_acl_to_xattr(acl, data, len); | |
102 | if (error < 0) | |
103 | goto out; | |
431547b3 | 104 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); |
106381bf SW |
105 | if (!error) |
106 | set_cached_acl(inode, type, acl); | |
479c427d SW |
107 | out: |
108 | kfree(data); | |
109 | return error; | |
110 | } | |
111 | ||
112 | int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) | |
113 | { | |
114 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
826cae2f | 115 | struct posix_acl *acl; |
d3fb6120 | 116 | umode_t mode = inode->i_mode; |
479c427d | 117 | int error = 0; |
b3b94faa DT |
118 | |
119 | if (!sdp->sd_args.ar_posix_acl) | |
120 | return 0; | |
479c427d | 121 | if (S_ISLNK(inode->i_mode)) |
b3b94faa DT |
122 | return 0; |
123 | ||
018a01cd | 124 | acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT); |
479c427d SW |
125 | if (IS_ERR(acl)) |
126 | return PTR_ERR(acl); | |
b3b94faa | 127 | if (!acl) { |
ce3b0f8d | 128 | mode &= ~current_umask(); |
479c427d SW |
129 | if (mode != inode->i_mode) |
130 | error = gfs2_set_mode(inode, mode); | |
b3b94faa DT |
131 | return error; |
132 | } | |
133 | ||
479c427d SW |
134 | if (S_ISDIR(inode->i_mode)) { |
135 | error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); | |
136 | if (error) | |
137 | goto out; | |
138 | } | |
139 | ||
826cae2f | 140 | error = posix_acl_create(&acl, GFP_NOFS, &mode); |
b3b94faa | 141 | if (error < 0) |
826cae2f AV |
142 | return error; |
143 | ||
40b78a32 SW |
144 | if (error == 0) |
145 | goto munge; | |
b3b94faa | 146 | |
479c427d | 147 | error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); |
40b78a32 SW |
148 | if (error) |
149 | goto out; | |
150 | munge: | |
479c427d | 151 | error = gfs2_set_mode(inode, mode); |
a91ea69f | 152 | out: |
b3b94faa | 153 | posix_acl_release(acl); |
b3b94faa DT |
154 | return error; |
155 | } | |
156 | ||
157 | int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) | |
158 | { | |
ab9bbda0 | 159 | struct inode *inode = &ip->i_inode; |
bc26ab5f | 160 | struct posix_acl *acl; |
b3b94faa DT |
161 | char *data; |
162 | unsigned int len; | |
163 | int error; | |
164 | ||
018a01cd | 165 | acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS); |
479c427d SW |
166 | if (IS_ERR(acl)) |
167 | return PTR_ERR(acl); | |
b3b94faa | 168 | if (!acl) |
ab9bbda0 | 169 | return gfs2_setattr_simple(inode, attr); |
b3b94faa | 170 | |
bc26ab5f AV |
171 | error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode); |
172 | if (error) | |
173 | return error; | |
174 | ||
175 | len = posix_acl_to_xattr(acl, NULL, 0); | |
176 | data = kmalloc(len, GFP_NOFS); | |
b3b94faa | 177 | error = -ENOMEM; |
bc26ab5f | 178 | if (data == NULL) |
b3b94faa | 179 | goto out; |
bc26ab5f AV |
180 | posix_acl_to_xattr(acl, data, len); |
181 | error = gfs2_xattr_acl_chmod(ip, attr, data); | |
182 | kfree(data); | |
183 | set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl); | |
b3b94faa | 184 | |
a91ea69f | 185 | out: |
b3b94faa | 186 | posix_acl_release(acl); |
b3b94faa DT |
187 | return error; |
188 | } | |
189 | ||
2646a1f6 SW |
190 | static int gfs2_acl_type(const char *name) |
191 | { | |
192 | if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0) | |
193 | return ACL_TYPE_ACCESS; | |
194 | if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0) | |
195 | return ACL_TYPE_DEFAULT; | |
196 | return -EINVAL; | |
197 | } | |
198 | ||
431547b3 CH |
199 | static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, |
200 | void *buffer, size_t size, int xtype) | |
2646a1f6 | 201 | { |
431547b3 | 202 | struct inode *inode = dentry->d_inode; |
f72f2d2e | 203 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
106381bf | 204 | struct posix_acl *acl; |
2646a1f6 | 205 | int type; |
106381bf | 206 | int error; |
2646a1f6 | 207 | |
f72f2d2e SW |
208 | if (!sdp->sd_args.ar_posix_acl) |
209 | return -EOPNOTSUPP; | |
210 | ||
2646a1f6 SW |
211 | type = gfs2_acl_type(name); |
212 | if (type < 0) | |
213 | return type; | |
214 | ||
018a01cd | 215 | acl = gfs2_get_acl(inode, type); |
106381bf SW |
216 | if (IS_ERR(acl)) |
217 | return PTR_ERR(acl); | |
218 | if (acl == NULL) | |
219 | return -ENODATA; | |
2646a1f6 | 220 | |
106381bf SW |
221 | error = posix_acl_to_xattr(acl, buffer, size); |
222 | posix_acl_release(acl); | |
223 | ||
224 | return error; | |
225 | } | |
2646a1f6 | 226 | |
431547b3 CH |
227 | static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, |
228 | const void *value, size_t size, int flags, | |
229 | int xtype) | |
2646a1f6 | 230 | { |
431547b3 | 231 | struct inode *inode = dentry->d_inode; |
2646a1f6 SW |
232 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
233 | struct posix_acl *acl = NULL; | |
234 | int error = 0, type; | |
235 | ||
236 | if (!sdp->sd_args.ar_posix_acl) | |
237 | return -EOPNOTSUPP; | |
238 | ||
239 | type = gfs2_acl_type(name); | |
240 | if (type < 0) | |
241 | return type; | |
242 | if (flags & XATTR_CREATE) | |
243 | return -EINVAL; | |
244 | if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) | |
245 | return value ? -EACCES : 0; | |
246 | if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) | |
247 | return -EPERM; | |
248 | if (S_ISLNK(inode->i_mode)) | |
249 | return -EOPNOTSUPP; | |
250 | ||
251 | if (!value) | |
252 | goto set_acl; | |
253 | ||
254 | acl = posix_acl_from_xattr(value, size); | |
255 | if (!acl) { | |
256 | /* | |
257 | * acl_set_file(3) may request that we set default ACLs with | |
258 | * zero length -- defend (gracefully) against that here. | |
259 | */ | |
260 | goto out; | |
261 | } | |
262 | if (IS_ERR(acl)) { | |
263 | error = PTR_ERR(acl); | |
264 | goto out; | |
265 | } | |
266 | ||
267 | error = posix_acl_valid(acl); | |
268 | if (error) | |
269 | goto out_release; | |
270 | ||
271 | error = -EINVAL; | |
272 | if (acl->a_count > GFS2_ACL_MAX_ENTRIES) | |
273 | goto out_release; | |
274 | ||
275 | if (type == ACL_TYPE_ACCESS) { | |
d6952123 | 276 | umode_t mode = inode->i_mode; |
2646a1f6 SW |
277 | error = posix_acl_equiv_mode(acl, &mode); |
278 | ||
279 | if (error <= 0) { | |
280 | posix_acl_release(acl); | |
281 | acl = NULL; | |
282 | ||
283 | if (error < 0) | |
284 | return error; | |
285 | } | |
286 | ||
287 | error = gfs2_set_mode(inode, mode); | |
288 | if (error) | |
289 | goto out_release; | |
290 | } | |
291 | ||
292 | set_acl: | |
431547b3 | 293 | error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); |
106381bf SW |
294 | if (!error) { |
295 | if (acl) | |
296 | set_cached_acl(inode, type, acl); | |
297 | else | |
298 | forget_cached_acl(inode, type); | |
299 | } | |
2646a1f6 SW |
300 | out_release: |
301 | posix_acl_release(acl); | |
302 | out: | |
303 | return error; | |
304 | } | |
305 | ||
b7bb0a12 | 306 | const struct xattr_handler gfs2_xattr_system_handler = { |
2646a1f6 | 307 | .prefix = XATTR_SYSTEM_PREFIX, |
431547b3 | 308 | .flags = GFS2_EATYPE_SYS, |
2646a1f6 SW |
309 | .get = gfs2_xattr_system_get, |
310 | .set = gfs2_xattr_system_set, | |
311 | }; | |
312 |