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xattr_user.c
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1 /*
2  * linux/fs/ext3/xattr_user.c
3  * Handler for extended user attributes.
4  *
5  * Copyright (C) 2001 by Andreas Gruenbacher, <[email protected]>
6  */
7 
8 #include "ext3.h"
9 #include "xattr.h"
10 
11 static size_t
12 ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
13  const char *name, size_t name_len, int type)
14 {
15  const size_t prefix_len = XATTR_USER_PREFIX_LEN;
16  const size_t total_len = prefix_len + name_len + 1;
17 
18  if (!test_opt(dentry->d_sb, XATTR_USER))
19  return 0;
20 
21  if (list && total_len <= list_size) {
22  memcpy(list, XATTR_USER_PREFIX, prefix_len);
23  memcpy(list+prefix_len, name, name_len);
24  list[prefix_len + name_len] = '\0';
25  }
26  return total_len;
27 }
28 
29 static int
30 ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
31  size_t size, int type)
32 {
33  if (strcmp(name, "") == 0)
34  return -EINVAL;
35  if (!test_opt(dentry->d_sb, XATTR_USER))
36  return -EOPNOTSUPP;
38  name, buffer, size);
39 }
40 
41 static int
42 ext3_xattr_user_set(struct dentry *dentry, const char *name,
43  const void *value, size_t size, int flags, int type)
44 {
45  if (strcmp(name, "") == 0)
46  return -EINVAL;
47  if (!test_opt(dentry->d_sb, XATTR_USER))
48  return -EOPNOTSUPP;
50  name, value, size, flags);
51 }
52 
54  .prefix = XATTR_USER_PREFIX,
55  .list = ext3_xattr_user_list,
56  .get = ext3_xattr_user_get,
57  .set = ext3_xattr_user_set,
58 };