1/* 2 * linux/fs/ext4/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/module.h> 9#include <linux/string.h> 10#include <linux/fs.h> 11#include "ext4_jbd2.h" 12#include "ext4.h" 13#include "xattr.h" 14 15static size_t 16ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size, 17 const char *name, size_t name_len, int type) 18{ 19 const size_t prefix_len = XATTR_USER_PREFIX_LEN; 20 const size_t total_len = prefix_len + name_len + 1; 21 22 if (!test_opt(dentry->d_sb, XATTR_USER)) 23 return 0; 24 25 if (list && total_len <= list_size) { 26 memcpy(list, XATTR_USER_PREFIX, prefix_len); 27 memcpy(list+prefix_len, name, name_len); 28 list[prefix_len + name_len] = '\0'; 29 } 30 return total_len; 31} 32 33static int 34ext4_xattr_user_get(struct dentry *dentry, const char *name, 35 void *buffer, size_t size, int type) 36{ 37 if (strcmp(name, "") == 0) 38 return -EINVAL; 39 if (!test_opt(dentry->d_sb, XATTR_USER)) 40 return -EOPNOTSUPP; 41 return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER, 42 name, buffer, size); 43} 44 45static int 46ext4_xattr_user_set(struct dentry *dentry, const char *name, 47 const void *value, size_t size, int flags, int type) 48{ 49 if (strcmp(name, "") == 0) 50 return -EINVAL; 51 if (!test_opt(dentry->d_sb, XATTR_USER)) 52 return -EOPNOTSUPP; 53 return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER, 54 name, value, size, flags); 55} 56 57const struct xattr_handler ext4_xattr_user_handler = { 58 .prefix = XATTR_USER_PREFIX, 59 .list = ext4_xattr_user_list, 60 .get = ext4_xattr_user_get, 61 .set = ext4_xattr_user_set, 62}; 63