2 * linux/fs/ext2/xattr_user.c
3 * Handler for extended user attributes.
5 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
8 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/string.h>
14 #define XATTR_USER_PREFIX "user."
17 ext2_xattr_user_list(char *list, struct inode *inode,
18 const char *name, int name_len)
20 const int prefix_len = sizeof(XATTR_USER_PREFIX)-1;
22 if (!test_opt(inode->i_sb, XATTR_USER))
26 memcpy(list, XATTR_USER_PREFIX, prefix_len);
27 memcpy(list+prefix_len, name, name_len);
28 list[prefix_len + name_len] = '\0';
30 return prefix_len + name_len + 1;
34 ext2_xattr_user_get(struct inode *inode, const char *name,
35 void *buffer, size_t size)
39 if (strcmp(name, "") == 0)
41 if (!test_opt(inode->i_sb, XATTR_USER))
43 error = permission(inode, MAY_READ, NULL);
47 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
51 ext2_xattr_user_set(struct inode *inode, const char *name,
52 const void *value, size_t size, int flags)
56 if (strcmp(name, "") == 0)
58 if (!test_opt(inode->i_sb, XATTR_USER))
60 if ( !S_ISREG(inode->i_mode) &&
61 (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
63 error = permission(inode, MAY_WRITE, NULL);
67 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
71 struct ext2_xattr_handler ext2_xattr_user_handler = {
72 .prefix = XATTR_USER_PREFIX,
73 .list = ext2_xattr_user_list,
74 .get = ext2_xattr_user_get,
75 .set = ext2_xattr_user_set,
79 init_ext2_xattr_user(void)
81 return ext2_xattr_register(EXT2_XATTR_INDEX_USER,
82 &ext2_xattr_user_handler);
86 exit_ext2_xattr_user(void)
88 ext2_xattr_unregister(EXT2_XATTR_INDEX_USER,
89 &ext2_xattr_user_handler);