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 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 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 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