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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" | |
a4fbe6ab | 20 | #include "xfs_format.h" |
69432832 | 21 | #include "xfs_log_format.h" |
239880ef | 22 | #include "xfs_trans_resv.h" |
57062787 DC |
23 | #include "xfs_mount.h" |
24 | #include "xfs_da_format.h" | |
f9e09f09 LM |
25 | #include "xfs_inode.h" |
26 | #include "xfs_attr.h" | |
27 | #include "xfs_attr_leaf.h" | |
28 | #include "xfs_acl.h" | |
f9e09f09 LM |
29 | |
30 | #include <linux/posix_acl_xattr.h> | |
31 | #include <linux/xattr.h> | |
32 | ||
33 | ||
f9e09f09 | 34 | static int |
431547b3 | 35 | xfs_xattr_get(struct dentry *dentry, const char *name, |
f9e09f09 LM |
36 | void *value, size_t size, int xflags) |
37 | { | |
2b0143b5 | 38 | struct xfs_inode *ip = XFS_I(d_inode(dentry)); |
f9e09f09 LM |
39 | int error, asize = size; |
40 | ||
41 | if (strcmp(name, "") == 0) | |
42 | return -EINVAL; | |
43 | ||
44 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
45 | if (!size) { | |
46 | xflags |= ATTR_KERNOVAL; | |
47 | value = NULL; | |
48 | } | |
49 | ||
2451337d | 50 | error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags); |
f9e09f09 LM |
51 | if (error) |
52 | return error; | |
53 | return asize; | |
54 | } | |
55 | ||
56 | static int | |
431547b3 | 57 | xfs_xattr_set(struct dentry *dentry, const char *name, const void *value, |
f9e09f09 LM |
58 | size_t size, int flags, int xflags) |
59 | { | |
67d8e04e BF |
60 | struct xfs_inode *ip = XFS_I(d_inode(dentry)); |
61 | int error; | |
f9e09f09 LM |
62 | |
63 | if (strcmp(name, "") == 0) | |
64 | return -EINVAL; | |
65 | ||
66 | /* Convert Linux syscall to XFS internal ATTR flags */ | |
67 | if (flags & XATTR_CREATE) | |
68 | xflags |= ATTR_CREATE; | |
69 | if (flags & XATTR_REPLACE) | |
70 | xflags |= ATTR_REPLACE; | |
71 | ||
72 | if (!value) | |
2451337d | 73 | return xfs_attr_remove(ip, (unsigned char *)name, xflags); |
67d8e04e | 74 | error = xfs_attr_set(ip, (unsigned char *)name, |
a9273ca5 | 75 | (void *)value, size, xflags); |
67d8e04e BF |
76 | /* |
77 | * Invalidate any cached ACLs if the user has bypassed the ACL | |
78 | * interface. We don't validate the content whatsoever so it is caller | |
79 | * responsibility to provide data in valid format and ensure i_mode is | |
80 | * consistent. | |
81 | */ | |
82 | #ifdef CONFIG_XFS_POSIX_ACL | |
83 | if (!error && (xflags & ATTR_ROOT)) { | |
84 | if (!strcmp(name, SGI_ACL_FILE)) | |
85 | forget_cached_acl(VFS_I(ip), ACL_TYPE_ACCESS); | |
86 | else if (!strcmp(name, SGI_ACL_DEFAULT)) | |
87 | forget_cached_acl(VFS_I(ip), ACL_TYPE_DEFAULT); | |
88 | } | |
89 | #endif | |
90 | ||
91 | return error; | |
f9e09f09 LM |
92 | } |
93 | ||
46e58764 | 94 | static const struct xattr_handler xfs_xattr_user_handler = { |
f9e09f09 | 95 | .prefix = XATTR_USER_PREFIX, |
431547b3 CH |
96 | .flags = 0, /* no flags implies user namespace */ |
97 | .get = xfs_xattr_get, | |
98 | .set = xfs_xattr_set, | |
f9e09f09 LM |
99 | }; |
100 | ||
46e58764 | 101 | static const struct xattr_handler xfs_xattr_trusted_handler = { |
f9e09f09 | 102 | .prefix = XATTR_TRUSTED_PREFIX, |
431547b3 CH |
103 | .flags = ATTR_ROOT, |
104 | .get = xfs_xattr_get, | |
105 | .set = xfs_xattr_set, | |
f9e09f09 LM |
106 | }; |
107 | ||
46e58764 | 108 | static const struct xattr_handler xfs_xattr_security_handler = { |
f9e09f09 | 109 | .prefix = XATTR_SECURITY_PREFIX, |
431547b3 CH |
110 | .flags = ATTR_SECURE, |
111 | .get = xfs_xattr_get, | |
112 | .set = xfs_xattr_set, | |
f9e09f09 LM |
113 | }; |
114 | ||
46e58764 | 115 | const struct xattr_handler *xfs_xattr_handlers[] = { |
f9e09f09 LM |
116 | &xfs_xattr_user_handler, |
117 | &xfs_xattr_trusted_handler, | |
118 | &xfs_xattr_security_handler, | |
ef14f0c1 | 119 | #ifdef CONFIG_XFS_POSIX_ACL |
2401dc29 CH |
120 | &posix_acl_access_xattr_handler, |
121 | &posix_acl_default_xattr_handler, | |
ef14f0c1 | 122 | #endif |
f9e09f09 LM |
123 | NULL |
124 | }; | |
125 | ||
126 | static unsigned int xfs_xattr_prefix_len(int flags) | |
127 | { | |
128 | if (flags & XFS_ATTR_SECURE) | |
129 | return sizeof("security"); | |
130 | else if (flags & XFS_ATTR_ROOT) | |
131 | return sizeof("trusted"); | |
132 | else | |
133 | return sizeof("user"); | |
134 | } | |
135 | ||
136 | static const char *xfs_xattr_prefix(int flags) | |
137 | { | |
138 | if (flags & XFS_ATTR_SECURE) | |
139 | return xfs_xattr_security_handler.prefix; | |
140 | else if (flags & XFS_ATTR_ROOT) | |
141 | return xfs_xattr_trusted_handler.prefix; | |
142 | else | |
143 | return xfs_xattr_user_handler.prefix; | |
144 | } | |
145 | ||
146 | static int | |
a9273ca5 DC |
147 | xfs_xattr_put_listent( |
148 | struct xfs_attr_list_context *context, | |
149 | int flags, | |
150 | unsigned char *name, | |
151 | int namelen, | |
152 | int valuelen, | |
153 | unsigned char *value) | |
f9e09f09 LM |
154 | { |
155 | unsigned int prefix_len = xfs_xattr_prefix_len(flags); | |
156 | char *offset; | |
157 | int arraytop; | |
158 | ||
159 | ASSERT(context->count >= 0); | |
160 | ||
161 | /* | |
162 | * Only show root namespace entries if we are actually allowed to | |
163 | * see them. | |
164 | */ | |
165 | if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN)) | |
166 | return 0; | |
167 | ||
168 | arraytop = context->count + prefix_len + namelen + 1; | |
169 | if (arraytop > context->firstu) { | |
170 | context->count = -1; /* insufficient space */ | |
171 | return 1; | |
172 | } | |
173 | offset = (char *)context->alist + context->count; | |
174 | strncpy(offset, xfs_xattr_prefix(flags), prefix_len); | |
175 | offset += prefix_len; | |
a9273ca5 | 176 | strncpy(offset, (char *)name, namelen); /* real name */ |
f9e09f09 LM |
177 | offset += namelen; |
178 | *offset = '\0'; | |
179 | context->count += prefix_len + namelen + 1; | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static int | |
a9273ca5 DC |
184 | xfs_xattr_put_listent_sizes( |
185 | struct xfs_attr_list_context *context, | |
186 | int flags, | |
187 | unsigned char *name, | |
188 | int namelen, | |
189 | int valuelen, | |
190 | unsigned char *value) | |
f9e09f09 LM |
191 | { |
192 | context->count += xfs_xattr_prefix_len(flags) + namelen + 1; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int | |
197 | list_one_attr(const char *name, const size_t len, void *data, | |
198 | size_t size, ssize_t *result) | |
199 | { | |
200 | char *p = data + *result; | |
201 | ||
202 | *result += len; | |
203 | if (!size) | |
204 | return 0; | |
205 | if (*result > size) | |
206 | return -ERANGE; | |
207 | ||
208 | strcpy(p, name); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | ssize_t | |
213 | xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size) | |
214 | { | |
215 | struct xfs_attr_list_context context; | |
216 | struct attrlist_cursor_kern cursor = { 0 }; | |
2b0143b5 | 217 | struct inode *inode = d_inode(dentry); |
f9e09f09 LM |
218 | int error; |
219 | ||
220 | /* | |
221 | * First read the regular on-disk attributes. | |
222 | */ | |
223 | memset(&context, 0, sizeof(context)); | |
224 | context.dp = XFS_I(inode); | |
225 | context.cursor = &cursor; | |
226 | context.resynch = 1; | |
227 | context.alist = data; | |
228 | context.bufsize = size; | |
229 | context.firstu = context.bufsize; | |
230 | ||
231 | if (size) | |
232 | context.put_listent = xfs_xattr_put_listent; | |
233 | else | |
234 | context.put_listent = xfs_xattr_put_listent_sizes; | |
235 | ||
236 | xfs_attr_list_int(&context); | |
237 | if (context.count < 0) | |
238 | return -ERANGE; | |
239 | ||
240 | /* | |
241 | * Then add the two synthetic ACL attributes. | |
242 | */ | |
ef14f0c1 | 243 | if (posix_acl_access_exists(inode)) { |
f9e09f09 LM |
244 | error = list_one_attr(POSIX_ACL_XATTR_ACCESS, |
245 | strlen(POSIX_ACL_XATTR_ACCESS) + 1, | |
246 | data, size, &context.count); | |
247 | if (error) | |
248 | return error; | |
249 | } | |
250 | ||
ef14f0c1 | 251 | if (posix_acl_default_exists(inode)) { |
f9e09f09 LM |
252 | error = list_one_attr(POSIX_ACL_XATTR_DEFAULT, |
253 | strlen(POSIX_ACL_XATTR_DEFAULT) + 1, | |
254 | data, size, &context.count); | |
255 | if (error) | |
256 | return error; | |
257 | } | |
258 | ||
259 | return context.count; | |
260 | } |