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 | |
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 | |
5f3a4a28 | 66 | acl = posix_acl_from_xattr(&init_user_ns, data, len); |
479c427d SW |
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 | 75 | if (mode != inode->i_mode) { |
f9425ad4 SW |
76 | inode->i_mode = mode; |
77 | mark_inode_dirty(inode); | |
69dca424 | 78 | } |
b3b94faa | 79 | |
69dca424 | 80 | return error; |
b3b94faa DT |
81 | } |
82 | ||
479c427d | 83 | static int gfs2_acl_set(struct inode *inode, int type, struct posix_acl *acl) |
b3b94faa | 84 | { |
b3b94faa | 85 | int error; |
479c427d SW |
86 | int len; |
87 | char *data; | |
88 | const char *name = gfs2_acl_name(type); | |
89 | ||
90 | BUG_ON(name == NULL); | |
5f3a4a28 | 91 | len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0); |
479c427d SW |
92 | if (len == 0) |
93 | return 0; | |
94 | data = kmalloc(len, GFP_NOFS); | |
95 | if (data == NULL) | |
96 | return -ENOMEM; | |
5f3a4a28 | 97 | error = posix_acl_to_xattr(&init_user_ns, acl, data, len); |
479c427d SW |
98 | if (error < 0) |
99 | goto out; | |
431547b3 | 100 | error = __gfs2_xattr_set(inode, name, data, len, 0, GFS2_EATYPE_SYS); |
106381bf SW |
101 | if (!error) |
102 | set_cached_acl(inode, type, acl); | |
479c427d SW |
103 | out: |
104 | kfree(data); | |
105 | return error; | |
106 | } | |
107 | ||
108 | int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) | |
109 | { | |
110 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
826cae2f | 111 | struct posix_acl *acl; |
d3fb6120 | 112 | umode_t mode = inode->i_mode; |
479c427d | 113 | int error = 0; |
b3b94faa DT |
114 | |
115 | if (!sdp->sd_args.ar_posix_acl) | |
116 | return 0; | |
479c427d | 117 | if (S_ISLNK(inode->i_mode)) |
b3b94faa DT |
118 | return 0; |
119 | ||
018a01cd | 120 | acl = gfs2_get_acl(&dip->i_inode, ACL_TYPE_DEFAULT); |
479c427d SW |
121 | if (IS_ERR(acl)) |
122 | return PTR_ERR(acl); | |
b3b94faa | 123 | if (!acl) { |
ce3b0f8d | 124 | mode &= ~current_umask(); |
f9425ad4 | 125 | return gfs2_set_mode(inode, mode); |
b3b94faa DT |
126 | } |
127 | ||
479c427d SW |
128 | if (S_ISDIR(inode->i_mode)) { |
129 | error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); | |
130 | if (error) | |
131 | goto out; | |
132 | } | |
133 | ||
826cae2f | 134 | error = posix_acl_create(&acl, GFP_NOFS, &mode); |
b3b94faa | 135 | if (error < 0) |
826cae2f AV |
136 | return error; |
137 | ||
40b78a32 SW |
138 | if (error == 0) |
139 | goto munge; | |
b3b94faa | 140 | |
479c427d | 141 | error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); |
40b78a32 SW |
142 | if (error) |
143 | goto out; | |
144 | munge: | |
479c427d | 145 | error = gfs2_set_mode(inode, mode); |
a91ea69f | 146 | out: |
b3b94faa | 147 | posix_acl_release(acl); |
b3b94faa DT |
148 | return error; |
149 | } | |
150 | ||
151 | int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) | |
152 | { | |
ab9bbda0 | 153 | struct inode *inode = &ip->i_inode; |
bc26ab5f | 154 | struct posix_acl *acl; |
b3b94faa DT |
155 | char *data; |
156 | unsigned int len; | |
157 | int error; | |
158 | ||
018a01cd | 159 | acl = gfs2_get_acl(&ip->i_inode, ACL_TYPE_ACCESS); |
479c427d SW |
160 | if (IS_ERR(acl)) |
161 | return PTR_ERR(acl); | |
b3b94faa | 162 | if (!acl) |
ab9bbda0 | 163 | return gfs2_setattr_simple(inode, attr); |
b3b94faa | 164 | |
bc26ab5f AV |
165 | error = posix_acl_chmod(&acl, GFP_NOFS, attr->ia_mode); |
166 | if (error) | |
167 | return error; | |
168 | ||
5f3a4a28 | 169 | len = posix_acl_to_xattr(&init_user_ns, acl, NULL, 0); |
bc26ab5f | 170 | data = kmalloc(len, GFP_NOFS); |
b3b94faa | 171 | error = -ENOMEM; |
bc26ab5f | 172 | if (data == NULL) |
b3b94faa | 173 | goto out; |
5f3a4a28 | 174 | posix_acl_to_xattr(&init_user_ns, acl, data, len); |
bc26ab5f AV |
175 | error = gfs2_xattr_acl_chmod(ip, attr, data); |
176 | kfree(data); | |
177 | set_cached_acl(&ip->i_inode, ACL_TYPE_ACCESS, acl); | |
b3b94faa | 178 | |
a91ea69f | 179 | out: |
b3b94faa | 180 | posix_acl_release(acl); |
b3b94faa DT |
181 | return error; |
182 | } | |
183 | ||
2646a1f6 SW |
184 | static int gfs2_acl_type(const char *name) |
185 | { | |
186 | if (strcmp(name, GFS2_POSIX_ACL_ACCESS) == 0) | |
187 | return ACL_TYPE_ACCESS; | |
188 | if (strcmp(name, GFS2_POSIX_ACL_DEFAULT) == 0) | |
189 | return ACL_TYPE_DEFAULT; | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
431547b3 CH |
193 | static int gfs2_xattr_system_get(struct dentry *dentry, const char *name, |
194 | void *buffer, size_t size, int xtype) | |
2646a1f6 | 195 | { |
431547b3 | 196 | struct inode *inode = dentry->d_inode; |
f72f2d2e | 197 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
106381bf | 198 | struct posix_acl *acl; |
2646a1f6 | 199 | int type; |
106381bf | 200 | int error; |
2646a1f6 | 201 | |
f72f2d2e SW |
202 | if (!sdp->sd_args.ar_posix_acl) |
203 | return -EOPNOTSUPP; | |
204 | ||
2646a1f6 SW |
205 | type = gfs2_acl_type(name); |
206 | if (type < 0) | |
207 | return type; | |
208 | ||
018a01cd | 209 | acl = gfs2_get_acl(inode, type); |
106381bf SW |
210 | if (IS_ERR(acl)) |
211 | return PTR_ERR(acl); | |
212 | if (acl == NULL) | |
213 | return -ENODATA; | |
2646a1f6 | 214 | |
5f3a4a28 | 215 | error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
106381bf SW |
216 | posix_acl_release(acl); |
217 | ||
218 | return error; | |
219 | } | |
2646a1f6 | 220 | |
431547b3 CH |
221 | static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, |
222 | const void *value, size_t size, int flags, | |
223 | int xtype) | |
2646a1f6 | 224 | { |
431547b3 | 225 | struct inode *inode = dentry->d_inode; |
2646a1f6 SW |
226 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
227 | struct posix_acl *acl = NULL; | |
228 | int error = 0, type; | |
229 | ||
230 | if (!sdp->sd_args.ar_posix_acl) | |
231 | return -EOPNOTSUPP; | |
232 | ||
233 | type = gfs2_acl_type(name); | |
234 | if (type < 0) | |
235 | return type; | |
236 | if (flags & XATTR_CREATE) | |
237 | return -EINVAL; | |
238 | if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) | |
239 | return value ? -EACCES : 0; | |
240 | if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) | |
241 | return -EPERM; | |
242 | if (S_ISLNK(inode->i_mode)) | |
243 | return -EOPNOTSUPP; | |
244 | ||
245 | if (!value) | |
246 | goto set_acl; | |
247 | ||
5f3a4a28 | 248 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
2646a1f6 SW |
249 | if (!acl) { |
250 | /* | |
251 | * acl_set_file(3) may request that we set default ACLs with | |
252 | * zero length -- defend (gracefully) against that here. | |
253 | */ | |
254 | goto out; | |
255 | } | |
256 | if (IS_ERR(acl)) { | |
257 | error = PTR_ERR(acl); | |
258 | goto out; | |
259 | } | |
260 | ||
261 | error = posix_acl_valid(acl); | |
262 | if (error) | |
263 | goto out_release; | |
264 | ||
265 | error = -EINVAL; | |
266 | if (acl->a_count > GFS2_ACL_MAX_ENTRIES) | |
267 | goto out_release; | |
268 | ||
269 | if (type == ACL_TYPE_ACCESS) { | |
d6952123 | 270 | umode_t mode = inode->i_mode; |
2646a1f6 SW |
271 | error = posix_acl_equiv_mode(acl, &mode); |
272 | ||
273 | if (error <= 0) { | |
274 | posix_acl_release(acl); | |
275 | acl = NULL; | |
276 | ||
277 | if (error < 0) | |
278 | return error; | |
279 | } | |
280 | ||
281 | error = gfs2_set_mode(inode, mode); | |
282 | if (error) | |
283 | goto out_release; | |
284 | } | |
285 | ||
286 | set_acl: | |
431547b3 | 287 | error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); |
106381bf SW |
288 | if (!error) { |
289 | if (acl) | |
290 | set_cached_acl(inode, type, acl); | |
291 | else | |
292 | forget_cached_acl(inode, type); | |
293 | } | |
2646a1f6 SW |
294 | out_release: |
295 | posix_acl_release(acl); | |
296 | out: | |
297 | return error; | |
298 | } | |
299 | ||
b7bb0a12 | 300 | const struct xattr_handler gfs2_xattr_system_handler = { |
2646a1f6 | 301 | .prefix = XATTR_SYSTEM_PREFIX, |
431547b3 | 302 | .flags = GFS2_EATYPE_SYS, |
2646a1f6 SW |
303 | .get = gfs2_xattr_system_get, |
304 | .set = gfs2_xattr_system_set, | |
305 | }; | |
306 |