blob: 69f6e475de97cacba39f85cdd0c2058539260447 [file] [log] [blame]
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_mount.h"
24#include "xfs_da_format.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100025#include "xfs_inode.h"
26#include "xfs_attr.h"
27#include "xfs_attr_leaf.h"
28#include "xfs_acl.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100029
30#include <linux/posix_acl_xattr.h>
31#include <linux/xattr.h>
32
33
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100034static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000035xfs_xattr_get(struct dentry *dentry, const char *name,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100036 void *value, size_t size, int xflags)
37{
Christoph Hellwig431547b2009-11-13 09:52:56 +000038 struct xfs_inode *ip = XFS_I(dentry->d_inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100039 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
Dave Chinner24513372014-06-25 14:58:08 +100050 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100051 if (error)
52 return error;
53 return asize;
54}
55
56static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000057xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100058 size_t size, int flags, int xflags)
59{
Christoph Hellwig431547b2009-11-13 09:52:56 +000060 struct xfs_inode *ip = XFS_I(dentry->d_inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100061
62 if (strcmp(name, "") == 0)
63 return -EINVAL;
64
65 /* Convert Linux syscall to XFS internal ATTR flags */
66 if (flags & XATTR_CREATE)
67 xflags |= ATTR_CREATE;
68 if (flags & XATTR_REPLACE)
69 xflags |= ATTR_REPLACE;
70
71 if (!value)
Dave Chinner24513372014-06-25 14:58:08 +100072 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
73 return xfs_attr_set(ip, (unsigned char *)name,
Dave Chinnera9273ca2010-01-20 10:47:48 +110074 (void *)value, size, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100075}
76
Stephen Hemminger46e58762010-05-13 17:53:20 -070077static const struct xattr_handler xfs_xattr_user_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100078 .prefix = XATTR_USER_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000079 .flags = 0, /* no flags implies user namespace */
80 .get = xfs_xattr_get,
81 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100082};
83
Stephen Hemminger46e58762010-05-13 17:53:20 -070084static const struct xattr_handler xfs_xattr_trusted_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100085 .prefix = XATTR_TRUSTED_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000086 .flags = ATTR_ROOT,
87 .get = xfs_xattr_get,
88 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100089};
90
Stephen Hemminger46e58762010-05-13 17:53:20 -070091static const struct xattr_handler xfs_xattr_security_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100092 .prefix = XATTR_SECURITY_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000093 .flags = ATTR_SECURE,
94 .get = xfs_xattr_get,
95 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100096};
97
Stephen Hemminger46e58762010-05-13 17:53:20 -070098const struct xattr_handler *xfs_xattr_handlers[] = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100099 &xfs_xattr_user_handler,
100 &xfs_xattr_trusted_handler,
101 &xfs_xattr_security_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200102#ifdef CONFIG_XFS_POSIX_ACL
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800103 &posix_acl_access_xattr_handler,
104 &posix_acl_default_xattr_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200105#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000106 NULL
107};
108
109static unsigned int xfs_xattr_prefix_len(int flags)
110{
111 if (flags & XFS_ATTR_SECURE)
112 return sizeof("security");
113 else if (flags & XFS_ATTR_ROOT)
114 return sizeof("trusted");
115 else
116 return sizeof("user");
117}
118
119static const char *xfs_xattr_prefix(int flags)
120{
121 if (flags & XFS_ATTR_SECURE)
122 return xfs_xattr_security_handler.prefix;
123 else if (flags & XFS_ATTR_ROOT)
124 return xfs_xattr_trusted_handler.prefix;
125 else
126 return xfs_xattr_user_handler.prefix;
127}
128
129static int
Dave Chinnera9273ca2010-01-20 10:47:48 +1100130xfs_xattr_put_listent(
131 struct xfs_attr_list_context *context,
132 int flags,
133 unsigned char *name,
134 int namelen,
135 int valuelen,
136 unsigned char *value)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000137{
138 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
139 char *offset;
140 int arraytop;
141
142 ASSERT(context->count >= 0);
143
144 /*
145 * Only show root namespace entries if we are actually allowed to
146 * see them.
147 */
148 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
149 return 0;
150
151 arraytop = context->count + prefix_len + namelen + 1;
152 if (arraytop > context->firstu) {
153 context->count = -1; /* insufficient space */
154 return 1;
155 }
156 offset = (char *)context->alist + context->count;
157 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
158 offset += prefix_len;
Dave Chinnera9273ca2010-01-20 10:47:48 +1100159 strncpy(offset, (char *)name, namelen); /* real name */
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000160 offset += namelen;
161 *offset = '\0';
162 context->count += prefix_len + namelen + 1;
163 return 0;
164}
165
166static int
Dave Chinnera9273ca2010-01-20 10:47:48 +1100167xfs_xattr_put_listent_sizes(
168 struct xfs_attr_list_context *context,
169 int flags,
170 unsigned char *name,
171 int namelen,
172 int valuelen,
173 unsigned char *value)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000174{
175 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
176 return 0;
177}
178
179static int
180list_one_attr(const char *name, const size_t len, void *data,
181 size_t size, ssize_t *result)
182{
183 char *p = data + *result;
184
185 *result += len;
186 if (!size)
187 return 0;
188 if (*result > size)
189 return -ERANGE;
190
191 strcpy(p, name);
192 return 0;
193}
194
195ssize_t
196xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
197{
198 struct xfs_attr_list_context context;
199 struct attrlist_cursor_kern cursor = { 0 };
200 struct inode *inode = dentry->d_inode;
201 int error;
202
203 /*
204 * First read the regular on-disk attributes.
205 */
206 memset(&context, 0, sizeof(context));
207 context.dp = XFS_I(inode);
208 context.cursor = &cursor;
209 context.resynch = 1;
210 context.alist = data;
211 context.bufsize = size;
212 context.firstu = context.bufsize;
213
214 if (size)
215 context.put_listent = xfs_xattr_put_listent;
216 else
217 context.put_listent = xfs_xattr_put_listent_sizes;
218
219 xfs_attr_list_int(&context);
220 if (context.count < 0)
221 return -ERANGE;
222
223 /*
224 * Then add the two synthetic ACL attributes.
225 */
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200226 if (posix_acl_access_exists(inode)) {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000227 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
228 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
229 data, size, &context.count);
230 if (error)
231 return error;
232 }
233
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200234 if (posix_acl_default_exists(inode)) {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000235 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
236 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
237 data, size, &context.count);
238 if (error)
239 return error;
240 }
241
242 return context.count;
243}