Commit | Line | Data |
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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 |
b296821a AV |
35 | xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused, |
36 | struct inode *inode, const char *name, void *value, size_t size) | |
f9e09f09 | 37 | { |
d9a82a04 | 38 | int xflags = handler->flags; |
b296821a | 39 | struct xfs_inode *ip = XFS_I(inode); |
f9e09f09 LM |
40 | int error, asize = size; |
41 | ||
f9e09f09 LM |
42 | /* Convert Linux syscall to XFS internal ATTR flags */ |
43 | if (!size) { | |
44 | xflags |= ATTR_KERNOVAL; | |
45 | value = NULL; | |
46 | } | |
47 | ||
2451337d | 48 | error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags); |
f9e09f09 LM |
49 | if (error) |
50 | return error; | |
51 | return asize; | |
52 | } | |
53 | ||
47e1bf64 AG |
54 | void |
55 | xfs_forget_acl( | |
56 | struct inode *inode, | |
57 | const char *name, | |
58 | int xflags) | |
59 | { | |
60 | /* | |
61 | * Invalidate any cached ACLs if the user has bypassed the ACL | |
62 | * interface. We don't validate the content whatsoever so it is caller | |
63 | * responsibility to provide data in valid format and ensure i_mode is | |
64 | * consistent. | |
65 | */ | |
66 | if (xflags & ATTR_ROOT) { | |
67 | #ifdef CONFIG_XFS_POSIX_ACL | |
68 | if (!strcmp(name, SGI_ACL_FILE)) | |
69 | forget_cached_acl(inode, ACL_TYPE_ACCESS); | |
70 | else if (!strcmp(name, SGI_ACL_DEFAULT)) | |
71 | forget_cached_acl(inode, ACL_TYPE_DEFAULT); | |
72 | #endif | |
73 | } | |
74 | } | |
75 | ||
f9e09f09 | 76 | static int |
59301226 AV |
77 | xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused, |
78 | struct inode *inode, const char *name, const void *value, | |
79 | size_t size, int flags) | |
f9e09f09 | 80 | { |
5d2eb548 | 81 | int xflags = handler->flags; |
59301226 | 82 | struct xfs_inode *ip = XFS_I(inode); |
67d8e04e | 83 | int error; |
f9e09f09 | 84 | |
f9e09f09 LM |
85 | /* Convert Linux syscall to XFS internal ATTR flags */ |
86 | if (flags & XATTR_CREATE) | |
87 | xflags |= ATTR_CREATE; | |
88 | if (flags & XATTR_REPLACE) | |
89 | xflags |= ATTR_REPLACE; | |
90 | ||
91 | if (!value) | |
2451337d | 92 | return xfs_attr_remove(ip, (unsigned char *)name, xflags); |
67d8e04e | 93 | error = xfs_attr_set(ip, (unsigned char *)name, |
a9273ca5 | 94 | (void *)value, size, xflags); |
47e1bf64 | 95 | if (!error) |
59301226 | 96 | xfs_forget_acl(inode, name, xflags); |
67d8e04e BF |
97 | |
98 | return error; | |
f9e09f09 LM |
99 | } |
100 | ||
46e58764 | 101 | static const struct xattr_handler xfs_xattr_user_handler = { |
f9e09f09 | 102 | .prefix = XATTR_USER_PREFIX, |
431547b3 CH |
103 | .flags = 0, /* no flags implies user namespace */ |
104 | .get = xfs_xattr_get, | |
105 | .set = xfs_xattr_set, | |
f9e09f09 LM |
106 | }; |
107 | ||
46e58764 | 108 | static const struct xattr_handler xfs_xattr_trusted_handler = { |
f9e09f09 | 109 | .prefix = XATTR_TRUSTED_PREFIX, |
431547b3 CH |
110 | .flags = ATTR_ROOT, |
111 | .get = xfs_xattr_get, | |
112 | .set = xfs_xattr_set, | |
f9e09f09 LM |
113 | }; |
114 | ||
46e58764 | 115 | static const struct xattr_handler xfs_xattr_security_handler = { |
f9e09f09 | 116 | .prefix = XATTR_SECURITY_PREFIX, |
431547b3 CH |
117 | .flags = ATTR_SECURE, |
118 | .get = xfs_xattr_get, | |
119 | .set = xfs_xattr_set, | |
f9e09f09 LM |
120 | }; |
121 | ||
46e58764 | 122 | const struct xattr_handler *xfs_xattr_handlers[] = { |
f9e09f09 LM |
123 | &xfs_xattr_user_handler, |
124 | &xfs_xattr_trusted_handler, | |
125 | &xfs_xattr_security_handler, | |
ef14f0c1 | 126 | #ifdef CONFIG_XFS_POSIX_ACL |
2401dc29 CH |
127 | &posix_acl_access_xattr_handler, |
128 | &posix_acl_default_xattr_handler, | |
ef14f0c1 | 129 | #endif |
f9e09f09 LM |
130 | NULL |
131 | }; | |
132 | ||
f9e09f09 | 133 | static int |
5d92b75c | 134 | __xfs_xattr_put_listent( |
a9273ca5 | 135 | struct xfs_attr_list_context *context, |
5d92b75c AG |
136 | char *prefix, |
137 | int prefix_len, | |
138 | unsigned char *name, | |
139 | int namelen) | |
f9e09f09 | 140 | { |
f9e09f09 LM |
141 | char *offset; |
142 | int arraytop; | |
143 | ||
5d92b75c AG |
144 | if (!context->alist) |
145 | goto compute_size; | |
f9e09f09 LM |
146 | |
147 | arraytop = context->count + prefix_len + namelen + 1; | |
148 | if (arraytop > context->firstu) { | |
149 | context->count = -1; /* insufficient space */ | |
2a6fba6d | 150 | return 0; |
f9e09f09 LM |
151 | } |
152 | offset = (char *)context->alist + context->count; | |
5d92b75c | 153 | strncpy(offset, prefix, prefix_len); |
f9e09f09 | 154 | offset += prefix_len; |
a9273ca5 | 155 | strncpy(offset, (char *)name, namelen); /* real name */ |
f9e09f09 LM |
156 | offset += namelen; |
157 | *offset = '\0'; | |
5d92b75c AG |
158 | |
159 | compute_size: | |
f9e09f09 LM |
160 | context->count += prefix_len + namelen + 1; |
161 | return 0; | |
162 | } | |
163 | ||
164 | static int | |
5d92b75c | 165 | xfs_xattr_put_listent( |
a9273ca5 DC |
166 | struct xfs_attr_list_context *context, |
167 | int flags, | |
168 | unsigned char *name, | |
169 | int namelen, | |
e5bd12bf | 170 | int valuelen) |
f9e09f09 | 171 | { |
5d92b75c AG |
172 | char *prefix; |
173 | int prefix_len; | |
f9e09f09 | 174 | |
5d92b75c | 175 | ASSERT(context->count >= 0); |
f9e09f09 | 176 | |
5d92b75c AG |
177 | if (flags & XFS_ATTR_ROOT) { |
178 | #ifdef CONFIG_XFS_POSIX_ACL | |
179 | if (namelen == SGI_ACL_FILE_SIZE && | |
180 | strncmp(name, SGI_ACL_FILE, | |
181 | SGI_ACL_FILE_SIZE) == 0) { | |
182 | int ret = __xfs_xattr_put_listent( | |
183 | context, XATTR_SYSTEM_PREFIX, | |
184 | XATTR_SYSTEM_PREFIX_LEN, | |
185 | XATTR_POSIX_ACL_ACCESS, | |
186 | strlen(XATTR_POSIX_ACL_ACCESS)); | |
187 | if (ret) | |
188 | return ret; | |
189 | } else if (namelen == SGI_ACL_DEFAULT_SIZE && | |
190 | strncmp(name, SGI_ACL_DEFAULT, | |
191 | SGI_ACL_DEFAULT_SIZE) == 0) { | |
192 | int ret = __xfs_xattr_put_listent( | |
193 | context, XATTR_SYSTEM_PREFIX, | |
194 | XATTR_SYSTEM_PREFIX_LEN, | |
195 | XATTR_POSIX_ACL_DEFAULT, | |
196 | strlen(XATTR_POSIX_ACL_DEFAULT)); | |
197 | if (ret) | |
198 | return ret; | |
199 | } | |
200 | #endif | |
f9e09f09 | 201 | |
5d92b75c AG |
202 | /* |
203 | * Only show root namespace entries if we are actually allowed to | |
204 | * see them. | |
205 | */ | |
206 | if (!capable(CAP_SYS_ADMIN)) | |
207 | return 0; | |
208 | ||
209 | prefix = XATTR_TRUSTED_PREFIX; | |
210 | prefix_len = XATTR_TRUSTED_PREFIX_LEN; | |
211 | } else if (flags & XFS_ATTR_SECURE) { | |
212 | prefix = XATTR_SECURITY_PREFIX; | |
213 | prefix_len = XATTR_SECURITY_PREFIX_LEN; | |
214 | } else { | |
215 | prefix = XATTR_USER_PREFIX; | |
216 | prefix_len = XATTR_USER_PREFIX_LEN; | |
217 | } | |
218 | ||
219 | return __xfs_xattr_put_listent(context, prefix, prefix_len, name, | |
220 | namelen); | |
f9e09f09 LM |
221 | } |
222 | ||
223 | ssize_t | |
2a6fba6d ES |
224 | xfs_vn_listxattr( |
225 | struct dentry *dentry, | |
226 | char *data, | |
227 | size_t size) | |
f9e09f09 LM |
228 | { |
229 | struct xfs_attr_list_context context; | |
230 | struct attrlist_cursor_kern cursor = { 0 }; | |
2a6fba6d ES |
231 | struct inode *inode = d_inode(dentry); |
232 | int error; | |
f9e09f09 LM |
233 | |
234 | /* | |
235 | * First read the regular on-disk attributes. | |
236 | */ | |
237 | memset(&context, 0, sizeof(context)); | |
238 | context.dp = XFS_I(inode); | |
239 | context.cursor = &cursor; | |
240 | context.resynch = 1; | |
5d92b75c | 241 | context.alist = size ? data : NULL; |
f9e09f09 LM |
242 | context.bufsize = size; |
243 | context.firstu = context.bufsize; | |
5d92b75c | 244 | context.put_listent = xfs_xattr_put_listent; |
f9e09f09 | 245 | |
2a6fba6d ES |
246 | error = xfs_attr_list_int(&context); |
247 | if (error) | |
248 | return error; | |
f9e09f09 LM |
249 | if (context.count < 0) |
250 | return -ERANGE; | |
251 | ||
f9e09f09 LM |
252 | return context.count; |
253 | } |