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(dentry->d_inode);
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(dentry->d_inode);
62 if (strcmp(name, "") == 0)
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;
72 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
73 return xfs_attr_set(ip, (unsigned char *)name,
74 (void *)value, size, xflags);
77 static const struct xattr_handler xfs_xattr_user_handler = {
78 .prefix = XATTR_USER_PREFIX,
79 .flags = 0, /* no flags implies user namespace */
84 static const struct xattr_handler xfs_xattr_trusted_handler = {
85 .prefix = XATTR_TRUSTED_PREFIX,
91 static const struct xattr_handler xfs_xattr_security_handler = {
92 .prefix = XATTR_SECURITY_PREFIX,
98 const struct xattr_handler *xfs_xattr_handlers[] = {
99 &xfs_xattr_user_handler,
100 &xfs_xattr_trusted_handler,
101 &xfs_xattr_security_handler,
102 #ifdef CONFIG_XFS_POSIX_ACL
103 &posix_acl_access_xattr_handler,
104 &posix_acl_default_xattr_handler,
109 static unsigned int xfs_xattr_prefix_len(int flags)
111 if (flags & XFS_ATTR_SECURE)
112 return sizeof("security");
113 else if (flags & XFS_ATTR_ROOT)
114 return sizeof("trusted");
116 return sizeof("user");
119 static const char *xfs_xattr_prefix(int flags)
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;
126 return xfs_xattr_user_handler.prefix;
130 xfs_xattr_put_listent(
131 struct xfs_attr_list_context *context,
136 unsigned char *value)
138 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
142 ASSERT(context->count >= 0);
145 * Only show root namespace entries if we are actually allowed to
148 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
151 arraytop = context->count + prefix_len + namelen + 1;
152 if (arraytop > context->firstu) {
153 context->count = -1; /* insufficient space */
156 offset = (char *)context->alist + context->count;
157 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
158 offset += prefix_len;
159 strncpy(offset, (char *)name, namelen); /* real name */
162 context->count += prefix_len + namelen + 1;
167 xfs_xattr_put_listent_sizes(
168 struct xfs_attr_list_context *context,
173 unsigned char *value)
175 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
180 list_one_attr(const char *name, const size_t len, void *data,
181 size_t size, ssize_t *result)
183 char *p = data + *result;
196 xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
198 struct xfs_attr_list_context context;
199 struct attrlist_cursor_kern cursor = { 0 };
200 struct inode *inode = dentry->d_inode;
204 * First read the regular on-disk attributes.
206 memset(&context, 0, sizeof(context));
207 context.dp = XFS_I(inode);
208 context.cursor = &cursor;
210 context.alist = data;
211 context.bufsize = size;
212 context.firstu = context.bufsize;
215 context.put_listent = xfs_xattr_put_listent;
217 context.put_listent = xfs_xattr_put_listent_sizes;
219 xfs_attr_list_int(&context);
220 if (context.count < 0)
224 * Then add the two synthetic ACL attributes.
226 if (posix_acl_access_exists(inode)) {
227 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
228 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
229 data, size, &context.count);
234 if (posix_acl_default_exists(inode)) {
235 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
236 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
237 data, size, &context.count);
242 return context.count;