1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2008 Christoph Hellwig.
4 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_da_format.h"
12 #include "xfs_inode.h"
15 #include "xfs_da_btree.h"
17 #include <linux/posix_acl_xattr.h>
21 xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
22 struct inode *inode, const char *name, void *value, size_t size)
24 struct xfs_da_args args = {
26 .attr_filter = handler->flags,
28 .namelen = strlen(name),
34 error = xfs_attr_get(&args);
41 xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
42 struct inode *inode, const char *name, const void *value,
43 size_t size, int flags)
45 struct xfs_da_args args = {
47 .attr_filter = handler->flags,
50 .namelen = strlen(name),
51 .value = (void *)value,
56 error = xfs_attr_set(&args);
57 if (!error && (handler->flags & XFS_ATTR_ROOT))
58 xfs_forget_acl(inode, name);
62 static const struct xattr_handler xfs_xattr_user_handler = {
63 .prefix = XATTR_USER_PREFIX,
64 .flags = 0, /* no flags implies user namespace */
69 static const struct xattr_handler xfs_xattr_trusted_handler = {
70 .prefix = XATTR_TRUSTED_PREFIX,
71 .flags = XFS_ATTR_ROOT,
76 static const struct xattr_handler xfs_xattr_security_handler = {
77 .prefix = XATTR_SECURITY_PREFIX,
78 .flags = XFS_ATTR_SECURE,
83 const struct xattr_handler *xfs_xattr_handlers[] = {
84 &xfs_xattr_user_handler,
85 &xfs_xattr_trusted_handler,
86 &xfs_xattr_security_handler,
87 #ifdef CONFIG_XFS_POSIX_ACL
88 &posix_acl_access_xattr_handler,
89 &posix_acl_default_xattr_handler,
95 __xfs_xattr_put_listent(
96 struct xfs_attr_list_context *context,
105 if (context->count < 0 || context->seen_enough)
108 if (!context->buffer)
111 arraytop = context->count + prefix_len + namelen + 1;
112 if (arraytop > context->firstu) {
113 context->count = -1; /* insufficient space */
114 context->seen_enough = 1;
117 offset = context->buffer + context->count;
118 strncpy(offset, prefix, prefix_len);
119 offset += prefix_len;
120 strncpy(offset, (char *)name, namelen); /* real name */
125 context->count += prefix_len + namelen + 1;
130 xfs_xattr_put_listent(
131 struct xfs_attr_list_context *context,
140 ASSERT(context->count >= 0);
142 if (flags & XFS_ATTR_ROOT) {
143 #ifdef CONFIG_XFS_POSIX_ACL
144 if (namelen == SGI_ACL_FILE_SIZE &&
145 strncmp(name, SGI_ACL_FILE,
146 SGI_ACL_FILE_SIZE) == 0) {
147 __xfs_xattr_put_listent(
148 context, XATTR_SYSTEM_PREFIX,
149 XATTR_SYSTEM_PREFIX_LEN,
150 XATTR_POSIX_ACL_ACCESS,
151 strlen(XATTR_POSIX_ACL_ACCESS));
152 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
153 strncmp(name, SGI_ACL_DEFAULT,
154 SGI_ACL_DEFAULT_SIZE) == 0) {
155 __xfs_xattr_put_listent(
156 context, XATTR_SYSTEM_PREFIX,
157 XATTR_SYSTEM_PREFIX_LEN,
158 XATTR_POSIX_ACL_DEFAULT,
159 strlen(XATTR_POSIX_ACL_DEFAULT));
164 * Only show root namespace entries if we are actually allowed to
167 if (!capable(CAP_SYS_ADMIN))
170 prefix = XATTR_TRUSTED_PREFIX;
171 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
172 } else if (flags & XFS_ATTR_SECURE) {
173 prefix = XATTR_SECURITY_PREFIX;
174 prefix_len = XATTR_SECURITY_PREFIX_LEN;
176 prefix = XATTR_USER_PREFIX;
177 prefix_len = XATTR_USER_PREFIX_LEN;
180 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
187 struct dentry *dentry,
191 struct xfs_attr_list_context context;
192 struct inode *inode = d_inode(dentry);
196 * First read the regular on-disk attributes.
198 memset(&context, 0, sizeof(context));
199 context.dp = XFS_I(inode);
201 context.buffer = size ? data : NULL;
202 context.bufsize = size;
203 context.firstu = context.bufsize;
204 context.put_listent = xfs_xattr_put_listent;
206 error = xfs_attr_list(&context);
209 if (context.count < 0)
212 return context.count;