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"
25 #include "xfs_mount.h"
26 #include "xfs_da_format.h"
27 #include "xfs_inode.h"
29 #include "xfs_attr_leaf.h"
32 #include <linux/posix_acl_xattr.h>
33 #include <linux/xattr.h>
37 xfs_xattr_get(struct dentry *dentry, const char *name,
38 void *value, size_t size, int xflags)
40 struct xfs_inode *ip = XFS_I(dentry->d_inode);
41 int error, asize = size;
43 if (strcmp(name, "") == 0)
46 /* Convert Linux syscall to XFS internal ATTR flags */
48 xflags |= ATTR_KERNOVAL;
52 error = -xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
59 xfs_xattr_set(struct dentry *dentry, const char *name, const void *value,
60 size_t size, int flags, int xflags)
62 struct xfs_inode *ip = XFS_I(dentry->d_inode);
64 if (strcmp(name, "") == 0)
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;
74 return -xfs_attr_remove(ip, (unsigned char *)name, xflags);
75 return -xfs_attr_set(ip, (unsigned char *)name,
76 (void *)value, size, xflags);
79 static const struct xattr_handler xfs_xattr_user_handler = {
80 .prefix = XATTR_USER_PREFIX,
81 .flags = 0, /* no flags implies user namespace */
86 static const struct xattr_handler xfs_xattr_trusted_handler = {
87 .prefix = XATTR_TRUSTED_PREFIX,
93 static const struct xattr_handler xfs_xattr_security_handler = {
94 .prefix = XATTR_SECURITY_PREFIX,
100 const struct xattr_handler *xfs_xattr_handlers[] = {
101 &xfs_xattr_user_handler,
102 &xfs_xattr_trusted_handler,
103 &xfs_xattr_security_handler,
104 #ifdef CONFIG_XFS_POSIX_ACL
105 &xfs_xattr_acl_access_handler,
106 &xfs_xattr_acl_default_handler,
111 static unsigned int xfs_xattr_prefix_len(int flags)
113 if (flags & XFS_ATTR_SECURE)
114 return sizeof("security");
115 else if (flags & XFS_ATTR_ROOT)
116 return sizeof("trusted");
118 return sizeof("user");
121 static const char *xfs_xattr_prefix(int flags)
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;
128 return xfs_xattr_user_handler.prefix;
132 xfs_xattr_put_listent(
133 struct xfs_attr_list_context *context,
138 unsigned char *value)
140 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
144 ASSERT(context->count >= 0);
147 * Only show root namespace entries if we are actually allowed to
150 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
153 arraytop = context->count + prefix_len + namelen + 1;
154 if (arraytop > context->firstu) {
155 context->count = -1; /* insufficient space */
158 offset = (char *)context->alist + context->count;
159 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
160 offset += prefix_len;
161 strncpy(offset, (char *)name, namelen); /* real name */
164 context->count += prefix_len + namelen + 1;
169 xfs_xattr_put_listent_sizes(
170 struct xfs_attr_list_context *context,
175 unsigned char *value)
177 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
182 list_one_attr(const char *name, const size_t len, void *data,
183 size_t size, ssize_t *result)
185 char *p = data + *result;
198 xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
200 struct xfs_attr_list_context context;
201 struct attrlist_cursor_kern cursor = { 0 };
202 struct inode *inode = dentry->d_inode;
206 * First read the regular on-disk attributes.
208 memset(&context, 0, sizeof(context));
209 context.dp = XFS_I(inode);
210 context.cursor = &cursor;
212 context.alist = data;
213 context.bufsize = size;
214 context.firstu = context.bufsize;
217 context.put_listent = xfs_xattr_put_listent;
219 context.put_listent = xfs_xattr_put_listent_sizes;
221 xfs_attr_list_int(&context);
222 if (context.count < 0)
226 * Then add the two synthetic ACL attributes.
228 if (posix_acl_access_exists(inode)) {
229 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
230 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
231 data, size, &context.count);
236 if (posix_acl_default_exists(inode)) {
237 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
238 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
239 data, size, &context.count);
244 return context.count;