2 * Copyright (C) 2008 Christoph Hellwig.
3 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
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.
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.
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
20 #include "xfs_format.h"
21 #include "xfs_log_format.h"
22 #include "xfs_trans_resv.h"
23 #include "xfs_mount.h"
24 #include "xfs_da_format.h"
25 #include "xfs_inode.h"
27 #include "xfs_attr_leaf.h"
30 #include <linux/posix_acl_xattr.h>
31 #include <linux/xattr.h>
35 xfs_xattr_get(struct dentry *dentry, const char *name,
36 void *value, size_t size, int xflags)
38 struct xfs_inode *ip = XFS_I(d_inode(dentry));
39 int error, asize = size;
41 if (strcmp(name, "") == 0)
44 /* Convert Linux syscall to XFS internal ATTR flags */
46 xflags |= ATTR_KERNOVAL;
50 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
57 xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
58 size_t size, int flags, int xflags)
60 struct xfs_inode *ip = XFS_I(d_inode(dentry));
63 if (strcmp(name, "") == 0)
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;
73 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
74 error = xfs_attr_set(ip, (unsigned char *)name,
75 (void *)value, size, xflags);
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
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);
94 static const struct xattr_handler xfs_xattr_user_handler = {
95 .prefix = XATTR_USER_PREFIX,
96 .flags = 0, /* no flags implies user namespace */
101 static const struct xattr_handler xfs_xattr_trusted_handler = {
102 .prefix = XATTR_TRUSTED_PREFIX,
104 .get = xfs_xattr_get,
105 .set = xfs_xattr_set,
108 static const struct xattr_handler xfs_xattr_security_handler = {
109 .prefix = XATTR_SECURITY_PREFIX,
110 .flags = ATTR_SECURE,
111 .get = xfs_xattr_get,
112 .set = xfs_xattr_set,
115 const struct xattr_handler *xfs_xattr_handlers[] = {
116 &xfs_xattr_user_handler,
117 &xfs_xattr_trusted_handler,
118 &xfs_xattr_security_handler,
119 #ifdef CONFIG_XFS_POSIX_ACL
120 &posix_acl_access_xattr_handler,
121 &posix_acl_default_xattr_handler,
126 static unsigned int xfs_xattr_prefix_len(int flags)
128 if (flags & XFS_ATTR_SECURE)
129 return sizeof("security");
130 else if (flags & XFS_ATTR_ROOT)
131 return sizeof("trusted");
133 return sizeof("user");
136 static const char *xfs_xattr_prefix(int flags)
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;
143 return xfs_xattr_user_handler.prefix;
147 xfs_xattr_put_listent(
148 struct xfs_attr_list_context *context,
153 unsigned char *value)
155 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
159 ASSERT(context->count >= 0);
162 * Only show root namespace entries if we are actually allowed to
165 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
168 arraytop = context->count + prefix_len + namelen + 1;
169 if (arraytop > context->firstu) {
170 context->count = -1; /* insufficient space */
173 offset = (char *)context->alist + context->count;
174 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
175 offset += prefix_len;
176 strncpy(offset, (char *)name, namelen); /* real name */
179 context->count += prefix_len + namelen + 1;
184 xfs_xattr_put_listent_sizes(
185 struct xfs_attr_list_context *context,
190 unsigned char *value)
192 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
197 list_one_attr(const char *name, const size_t len, void *data,
198 size_t size, ssize_t *result)
200 char *p = data + *result;
213 xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
215 struct xfs_attr_list_context context;
216 struct attrlist_cursor_kern cursor = { 0 };
217 struct inode *inode = d_inode(dentry);
221 * First read the regular on-disk attributes.
223 memset(&context, 0, sizeof(context));
224 context.dp = XFS_I(inode);
225 context.cursor = &cursor;
227 context.alist = data;
228 context.bufsize = size;
229 context.firstu = context.bufsize;
232 context.put_listent = xfs_xattr_put_listent;
234 context.put_listent = xfs_xattr_put_listent_sizes;
236 xfs_attr_list_int(&context);
237 if (context.count < 0)
241 * Then add the two synthetic ACL attributes.
243 if (posix_acl_access_exists(inode)) {
244 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
245 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
246 data, size, &context.count);
251 if (posix_acl_default_exists(inode)) {
252 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
253 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
254 data, size, &context.count);
259 return context.count;