1 /*
2 * linux/fs/ext2/xattr_user.c
3 * Handler for extended user attributes.
4 *
5 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 */
7
8 #include <linux/init.h>
9 #include <linux/string.h>
10 #include "ext2.h"
11 #include "xattr.h"
12
13 static size_t
ext2_xattr_user_list(struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len,int type)14 ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
15 const char *name, size_t name_len, int type)
16 {
17 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
18 const size_t total_len = prefix_len + name_len + 1;
19
20 if (!test_opt(dentry->d_sb, XATTR_USER))
21 return 0;
22
23 if (list && total_len <= list_size) {
24 memcpy(list, XATTR_USER_PREFIX, prefix_len);
25 memcpy(list+prefix_len, name, name_len);
26 list[prefix_len + name_len] = '\0';
27 }
28 return total_len;
29 }
30
31 static int
ext2_xattr_user_get(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)32 ext2_xattr_user_get(struct dentry *dentry, const char *name,
33 void *buffer, size_t size, int type)
34 {
35 if (strcmp(name, "") == 0)
36 return -EINVAL;
37 if (!test_opt(dentry->d_sb, XATTR_USER))
38 return -EOPNOTSUPP;
39 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
40 name, buffer, size);
41 }
42
43 static int
ext2_xattr_user_set(struct dentry * dentry,const char * name,const void * value,size_t size,int flags,int type)44 ext2_xattr_user_set(struct dentry *dentry, const char *name,
45 const void *value, size_t size, int flags, int type)
46 {
47 if (strcmp(name, "") == 0)
48 return -EINVAL;
49 if (!test_opt(dentry->d_sb, XATTR_USER))
50 return -EOPNOTSUPP;
51
52 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
53 name, value, size, flags);
54 }
55
56 const struct xattr_handler ext2_xattr_user_handler = {
57 .prefix = XATTR_USER_PREFIX,
58 .list = ext2_xattr_user_list,
59 .get = ext2_xattr_user_get,
60 .set = ext2_xattr_user_set,
61 };
62