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