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f9e09f09 LM |
1 | /* |
2 | * Copyright (C) 2008 Christoph Hellwig. | |
3 | * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it would be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
17 | */ | |
18 | ||
19 | #include "xfs.h" | |
69432832 | 20 | #include "xfs_log_format.h" |
239880ef | 21 | #include "xfs_trans_resv.h" |
57062787 DC |
22 | #include "xfs_sb.h" |
23 | #include "xfs_ag.h" | |
24 | #include "xfs_mount.h" | |
25 | #include "xfs_da_format.h" | |
f9e09f09 LM |
26 | #include "xfs_bmap_btree.h" |
27 | #include "xfs_inode.h" | |
28 | #include "xfs_attr.h" | |
29 | #include "xfs_attr_leaf.h" | |
30 | #include "xfs_acl.h" | |
f9e09f09 LM |
31 | |
32 | #include <linux/posix_acl_xattr.h> | |
33 | #include <linux/xattr.h> | |
34 | ||
35 | ||
f9e09f09 | 36 | static int |
431547b3 | 37 | xfs_xattr_get(struct dentry *dentry, const char *name, |
f9e09f09 LM |
38 | void *value, size_t size, int xflags) |
39 | { | |
431547b3 | 40 | struct xfs_inode *ip = XFS_I(dentry->d_inode); |
f9e09f09 LM |
41 | int error, asize = size; |
42 | ||
43 | if (strcmp(name, "") == 0) | |
44 | return -EINVAL; | |
45 | ||
46 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
47 | if (!size) { | |
48 | xflags |= ATTR_KERNOVAL; | |
49 | value = NULL; | |
50 | } | |
51 | ||
a9273ca5 | 52 | error = -xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags); |
f9e09f09 LM |
53 | if (error) |
54 | return error; | |
55 | return asize; | |
56 | } | |
57 | ||
58 | static int | |
431547b3 | 59 | xfs_xattr_set(struct dentry *dentry, const char *name, const void *value, |
f9e09f09 LM |
60 | size_t size, int flags, int xflags) |
61 | { | |
431547b3 | 62 | struct xfs_inode *ip = XFS_I(dentry->d_inode); |
f9e09f09 LM |
63 | |
64 | if (strcmp(name, "") == 0) | |
65 | return -EINVAL; | |
66 | ||
67 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
68 | if (flags & XATTR_CREATE) | |
69 | xflags |= ATTR_CREATE; | |
70 | if (flags & XATTR_REPLACE) | |
71 | xflags |= ATTR_REPLACE; | |
72 | ||
73 | if (!value) | |
a9273ca5 DC |
74 | return -xfs_attr_remove(ip, (unsigned char *)name, xflags); |
75 | return -xfs_attr_set(ip, (unsigned char *)name, | |
76 | (void *)value, size, xflags); | |
f9e09f09 LM |
77 | } |
78 | ||
46e58764 | 79 | static const struct xattr_handler xfs_xattr_user_handler = { |
f9e09f09 | 80 | .prefix = XATTR_USER_PREFIX, |
431547b3 CH |
81 | .flags = 0, /* no flags implies user namespace */ |
82 | .get = xfs_xattr_get, | |
83 | .set = xfs_xattr_set, | |
f9e09f09 LM |
84 | }; |
85 | ||
46e58764 | 86 | static const struct xattr_handler xfs_xattr_trusted_handler = { |
f9e09f09 | 87 | .prefix = XATTR_TRUSTED_PREFIX, |
431547b3 CH |
88 | .flags = ATTR_ROOT, |
89 | .get = xfs_xattr_get, | |
90 | .set = xfs_xattr_set, | |
f9e09f09 LM |
91 | }; |
92 | ||
46e58764 | 93 | static const struct xattr_handler xfs_xattr_security_handler = { |
f9e09f09 | 94 | .prefix = XATTR_SECURITY_PREFIX, |
431547b3 CH |
95 | .flags = ATTR_SECURE, |
96 | .get = xfs_xattr_get, | |
97 | .set = xfs_xattr_set, | |
f9e09f09 LM |
98 | }; |
99 | ||
46e58764 | 100 | const struct xattr_handler *xfs_xattr_handlers[] = { |
f9e09f09 LM |
101 | &xfs_xattr_user_handler, |
102 | &xfs_xattr_trusted_handler, | |
103 | &xfs_xattr_security_handler, | |
ef14f0c1 | 104 | #ifdef CONFIG_XFS_POSIX_ACL |
431547b3 CH |
105 | &xfs_xattr_acl_access_handler, |
106 | &xfs_xattr_acl_default_handler, | |
ef14f0c1 | 107 | #endif |
f9e09f09 LM |
108 | NULL |
109 | }; | |
110 | ||
111 | static unsigned int xfs_xattr_prefix_len(int flags) | |
112 | { | |
113 | if (flags & XFS_ATTR_SECURE) | |
114 | return sizeof("security"); | |
115 | else if (flags & XFS_ATTR_ROOT) | |
116 | return sizeof("trusted"); | |
117 | else | |
118 | return sizeof("user"); | |
119 | } | |
120 | ||
121 | static const char *xfs_xattr_prefix(int flags) | |
122 | { | |
123 | if (flags & XFS_ATTR_SECURE) | |
124 | return xfs_xattr_security_handler.prefix; | |
125 | else if (flags & XFS_ATTR_ROOT) | |
126 | return xfs_xattr_trusted_handler.prefix; | |
127 | else | |
128 | return xfs_xattr_user_handler.prefix; | |
129 | } | |
130 | ||
131 | static int | |
a9273ca5 DC |
132 | xfs_xattr_put_listent( |
133 | struct xfs_attr_list_context *context, | |
134 | int flags, | |
135 | unsigned char *name, | |
136 | int namelen, | |
137 | int valuelen, | |
138 | unsigned char *value) | |
f9e09f09 LM |
139 | { |
140 | unsigned int prefix_len = xfs_xattr_prefix_len(flags); | |
141 | char *offset; | |
142 | int arraytop; | |
143 | ||
144 | ASSERT(context->count >= 0); | |
145 | ||
146 | /* | |
147 | * Only show root namespace entries if we are actually allowed to | |
148 | * see them. | |
149 | */ | |
150 | if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN)) | |
151 | return 0; | |
152 | ||
153 | arraytop = context->count + prefix_len + namelen + 1; | |
154 | if (arraytop > context->firstu) { | |
155 | context->count = -1; /* insufficient space */ | |
156 | return 1; | |
157 | } | |
158 | offset = (char *)context->alist + context->count; | |
159 | strncpy(offset, xfs_xattr_prefix(flags), prefix_len); | |
160 | offset += prefix_len; | |
a9273ca5 | 161 | strncpy(offset, (char *)name, namelen); /* real name */ |
f9e09f09 LM |
162 | offset += namelen; |
163 | *offset = '\0'; | |
164 | context->count += prefix_len + namelen + 1; | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static int | |
a9273ca5 DC |
169 | xfs_xattr_put_listent_sizes( |
170 | struct xfs_attr_list_context *context, | |
171 | int flags, | |
172 | unsigned char *name, | |
173 | int namelen, | |
174 | int valuelen, | |
175 | unsigned char *value) | |
f9e09f09 LM |
176 | { |
177 | context->count += xfs_xattr_prefix_len(flags) + namelen + 1; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static int | |
182 | list_one_attr(const char *name, const size_t len, void *data, | |
183 | size_t size, ssize_t *result) | |
184 | { | |
185 | char *p = data + *result; | |
186 | ||
187 | *result += len; | |
188 | if (!size) | |
189 | return 0; | |
190 | if (*result > size) | |
191 | return -ERANGE; | |
192 | ||
193 | strcpy(p, name); | |
194 | return 0; | |
195 | } | |
196 | ||
197 | ssize_t | |
198 | xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size) | |
199 | { | |
200 | struct xfs_attr_list_context context; | |
201 | struct attrlist_cursor_kern cursor = { 0 }; | |
202 | struct inode *inode = dentry->d_inode; | |
203 | int error; | |
204 | ||
205 | /* | |
206 | * First read the regular on-disk attributes. | |
207 | */ | |
208 | memset(&context, 0, sizeof(context)); | |
209 | context.dp = XFS_I(inode); | |
210 | context.cursor = &cursor; | |
211 | context.resynch = 1; | |
212 | context.alist = data; | |
213 | context.bufsize = size; | |
214 | context.firstu = context.bufsize; | |
215 | ||
216 | if (size) | |
217 | context.put_listent = xfs_xattr_put_listent; | |
218 | else | |
219 | context.put_listent = xfs_xattr_put_listent_sizes; | |
220 | ||
221 | xfs_attr_list_int(&context); | |
222 | if (context.count < 0) | |
223 | return -ERANGE; | |
224 | ||
225 | /* | |
226 | * Then add the two synthetic ACL attributes. | |
227 | */ | |
ef14f0c1 | 228 | if (posix_acl_access_exists(inode)) { |
f9e09f09 LM |
229 | error = list_one_attr(POSIX_ACL_XATTR_ACCESS, |
230 | strlen(POSIX_ACL_XATTR_ACCESS) + 1, | |
231 | data, size, &context.count); | |
232 | if (error) | |
233 | return error; | |
234 | } | |
235 | ||
ef14f0c1 | 236 | if (posix_acl_default_exists(inode)) { |
f9e09f09 LM |
237 | error = list_one_attr(POSIX_ACL_XATTR_DEFAULT, |
238 | strlen(POSIX_ACL_XATTR_DEFAULT) + 1, | |
239 | data, size, &context.count); | |
240 | if (error) | |
241 | return error; | |
242 | } | |
243 | ||
244 | return context.count; | |
245 | } |