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(const struct xattr_handler *handler, struct dentry *dentry,
36 const char *name, void *value, size_t size)
38 int xflags = handler->flags;
39 struct xfs_inode *ip = XFS_I(d_inode(dentry));
40 int error, asize = size;
42 if (strcmp(name, "") == 0)
45 /* Convert Linux syscall to XFS internal ATTR flags */
47 xflags |= ATTR_KERNOVAL;
51 error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags);
64 * Invalidate any cached ACLs if the user has bypassed the ACL
65 * interface. We don't validate the content whatsoever so it is caller
66 * responsibility to provide data in valid format and ensure i_mode is
69 if (xflags & ATTR_ROOT) {
70 #ifdef CONFIG_XFS_POSIX_ACL
71 if (!strcmp(name, SGI_ACL_FILE))
72 forget_cached_acl(inode, ACL_TYPE_ACCESS);
73 else if (!strcmp(name, SGI_ACL_DEFAULT))
74 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
80 xfs_xattr_set(const struct xattr_handler *handler, struct dentry *dentry,
81 const char *name, const void *value, size_t size, int flags)
83 int xflags = handler->flags;
84 struct xfs_inode *ip = XFS_I(d_inode(dentry));
87 if (strcmp(name, "") == 0)
90 /* Convert Linux syscall to XFS internal ATTR flags */
91 if (flags & XATTR_CREATE)
92 xflags |= ATTR_CREATE;
93 if (flags & XATTR_REPLACE)
94 xflags |= ATTR_REPLACE;
97 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
98 error = xfs_attr_set(ip, (unsigned char *)name,
99 (void *)value, size, xflags);
101 xfs_forget_acl(d_inode(dentry), name, xflags);
106 static const struct xattr_handler xfs_xattr_user_handler = {
107 .prefix = XATTR_USER_PREFIX,
108 .flags = 0, /* no flags implies user namespace */
109 .get = xfs_xattr_get,
110 .set = xfs_xattr_set,
113 static const struct xattr_handler xfs_xattr_trusted_handler = {
114 .prefix = XATTR_TRUSTED_PREFIX,
116 .get = xfs_xattr_get,
117 .set = xfs_xattr_set,
120 static const struct xattr_handler xfs_xattr_security_handler = {
121 .prefix = XATTR_SECURITY_PREFIX,
122 .flags = ATTR_SECURE,
123 .get = xfs_xattr_get,
124 .set = xfs_xattr_set,
127 const struct xattr_handler *xfs_xattr_handlers[] = {
128 &xfs_xattr_user_handler,
129 &xfs_xattr_trusted_handler,
130 &xfs_xattr_security_handler,
131 #ifdef CONFIG_XFS_POSIX_ACL
132 &posix_acl_access_xattr_handler,
133 &posix_acl_default_xattr_handler,
138 static unsigned int xfs_xattr_prefix_len(int flags)
140 if (flags & XFS_ATTR_SECURE)
141 return sizeof("security");
142 else if (flags & XFS_ATTR_ROOT)
143 return sizeof("trusted");
145 return sizeof("user");
148 static const char *xfs_xattr_prefix(int flags)
150 if (flags & XFS_ATTR_SECURE)
151 return xfs_xattr_security_handler.prefix;
152 else if (flags & XFS_ATTR_ROOT)
153 return xfs_xattr_trusted_handler.prefix;
155 return xfs_xattr_user_handler.prefix;
159 xfs_xattr_put_listent(
160 struct xfs_attr_list_context *context,
165 unsigned char *value)
167 unsigned int prefix_len = xfs_xattr_prefix_len(flags);
171 ASSERT(context->count >= 0);
174 * Only show root namespace entries if we are actually allowed to
177 if ((flags & XFS_ATTR_ROOT) && !capable(CAP_SYS_ADMIN))
180 arraytop = context->count + prefix_len + namelen + 1;
181 if (arraytop > context->firstu) {
182 context->count = -1; /* insufficient space */
185 offset = (char *)context->alist + context->count;
186 strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
187 offset += prefix_len;
188 strncpy(offset, (char *)name, namelen); /* real name */
191 context->count += prefix_len + namelen + 1;
196 xfs_xattr_put_listent_sizes(
197 struct xfs_attr_list_context *context,
202 unsigned char *value)
204 context->count += xfs_xattr_prefix_len(flags) + namelen + 1;
209 list_one_attr(const char *name, const size_t len, void *data,
210 size_t size, ssize_t *result)
212 char *p = data + *result;
225 xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
227 struct xfs_attr_list_context context;
228 struct attrlist_cursor_kern cursor = { 0 };
229 struct inode *inode = d_inode(dentry);
233 * First read the regular on-disk attributes.
235 memset(&context, 0, sizeof(context));
236 context.dp = XFS_I(inode);
237 context.cursor = &cursor;
239 context.alist = data;
240 context.bufsize = size;
241 context.firstu = context.bufsize;
244 context.put_listent = xfs_xattr_put_listent;
246 context.put_listent = xfs_xattr_put_listent_sizes;
248 xfs_attr_list_int(&context);
249 if (context.count < 0)
253 * Then add the two synthetic ACL attributes.
255 if (posix_acl_access_exists(inode)) {
256 error = list_one_attr(POSIX_ACL_XATTR_ACCESS,
257 strlen(POSIX_ACL_XATTR_ACCESS) + 1,
258 data, size, &context.count);
263 if (posix_acl_default_exists(inode)) {
264 error = list_one_attr(POSIX_ACL_XATTR_DEFAULT,
265 strlen(POSIX_ACL_XATTR_DEFAULT) + 1,
266 data, size, &context.count);
271 return context.count;