1/* 2 * linux/fs/ext3/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 <linux/ext3_jbd.h> 12#include <linux/ext3_fs.h> 13#include "xattr.h" 14 15#define XATTR_USER_PREFIX "user." 16 17static size_t 18ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size, 19 const char *name, size_t name_len) 20{ 21 const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1; 22 const size_t total_len = prefix_len + name_len + 1; 23 24 if (!test_opt(inode->i_sb, XATTR_USER)) 25 return 0; 26 27 if (list && total_len <= list_size) { 28 memcpy(list, XATTR_USER_PREFIX, prefix_len); 29 memcpy(list+prefix_len, name, name_len); 30 list[prefix_len + name_len] = '\0'; 31 } 32 return total_len; 33} 34 35static int 36ext3_xattr_user_get(struct inode *inode, const char *name, 37 void *buffer, size_t size) 38{ 39 if (strcmp(name, "") == 0) 40 return -EINVAL; 41 if (!test_opt(inode->i_sb, XATTR_USER)) 42 return -EOPNOTSUPP; 43 return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size); 44} 45 46static int 47ext3_xattr_user_set(struct inode *inode, const char *name, 48 const void *value, size_t size, int flags) 49{ 50 if (strcmp(name, "") == 0) 51 return -EINVAL; 52 if (!test_opt(inode->i_sb, XATTR_USER)) 53 return -EOPNOTSUPP; 54 return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name, 55 value, size, flags); 56} 57 58struct xattr_handler ext3_xattr_user_handler = { 59 .prefix = XATTR_USER_PREFIX, 60 .list = ext3_xattr_user_list, 61 .get = ext3_xattr_user_get, 62 .set = ext3_xattr_user_set, 63}; 64