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Lachlan McIlroyf9e09f02008-06-23 13:34:09 +10001/*
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"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110020#include "xfs_format.h"
Dave Chinner69432832013-08-12 20:49:23 +100021#include "xfs_log_format.h"
Dave Chinner239880e2013-10-23 10:50:10 +110022#include "xfs_trans_resv.h"
Dave Chinner57062782013-10-15 09:17:51 +110023#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_da_format.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100027#include "xfs_inode.h"
28#include "xfs_attr.h"
29#include "xfs_attr_leaf.h"
30#include "xfs_acl.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100031
32#include <linux/posix_acl_xattr.h>
33#include <linux/xattr.h>
34
35
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100036static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000037xfs_xattr_get(struct dentry *dentry, const char *name,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100038 void *value, size_t size, int xflags)
39{
Christoph Hellwig431547b2009-11-13 09:52:56 +000040 struct xfs_inode *ip = XFS_I(dentry->d_inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100041 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
Dave Chinnera9273ca2010-01-20 10:47:48 +110052 error = -xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100053 if (error)
54 return error;
55 return asize;
56}
57
58static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000059xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100060 size_t size, int flags, int xflags)
61{
Christoph Hellwig431547b2009-11-13 09:52:56 +000062 struct xfs_inode *ip = XFS_I(dentry->d_inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100063
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)
Dave Chinnera9273ca2010-01-20 10:47:48 +110074 return -xfs_attr_remove(ip, (unsigned char *)name, xflags);
75 return -xfs_attr_set(ip, (unsigned char *)name,
76 (void *)value, size, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100077}
78
Stephen Hemminger46e58762010-05-13 17:53:20 -070079static const struct xattr_handler xfs_xattr_user_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100080 .prefix = XATTR_USER_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000081 .flags = 0, /* no flags implies user namespace */
82 .get = xfs_xattr_get,
83 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100084};
85
Stephen Hemminger46e58762010-05-13 17:53:20 -070086static const struct xattr_handler xfs_xattr_trusted_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100087 .prefix = XATTR_TRUSTED_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000088 .flags = ATTR_ROOT,
89 .get = xfs_xattr_get,
90 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100091};
92
Stephen Hemminger46e58762010-05-13 17:53:20 -070093static const struct xattr_handler xfs_xattr_security_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100094 .prefix = XATTR_SECURITY_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000095 .flags = ATTR_SECURE,
96 .get = xfs_xattr_get,
97 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100098};
99
Stephen Hemminger46e58762010-05-13 17:53:20 -0700100const struct xattr_handler *xfs_xattr_handlers[] = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000101 &xfs_xattr_user_handler,
102 &xfs_xattr_trusted_handler,
103 &xfs_xattr_security_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200104#ifdef CONFIG_XFS_POSIX_ACL
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800105 &posix_acl_access_xattr_handler,
106 &posix_acl_default_xattr_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200107#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000108 NULL
109};
110
111static 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
121static 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
131static int
Dave Chinnera9273ca2010-01-20 10:47:48 +1100132xfs_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)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000139{
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;
Dave Chinnera9273ca2010-01-20 10:47:48 +1100161 strncpy(offset, (char *)name, namelen); /* real name */
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000162 offset += namelen;
163 *offset = '\0';
164 context->count += prefix_len + namelen + 1;
165 return 0;
166}
167
168static int
Dave Chinnera9273ca2010-01-20 10:47:48 +1100169xfs_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)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000176{
177 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
178 return 0;
179}
180
181static int
182list_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
197ssize_t
198xfs_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 */
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200228 if (posix_acl_access_exists(inode)) {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000229 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
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200236 if (posix_acl_default_exists(inode)) {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000237 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}