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(const struct xattr_handler *handler, 16 struct dentry *dentry, char *list, size_t list_size, 17 const char *name, size_t name_len) 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 33 static int 34 ext4_xattr_user_get(const struct xattr_handler *handler, 35 struct dentry *dentry, const char *name, 36 void *buffer, size_t size) 37 { 38 if (!test_opt(dentry->d_sb, XATTR_USER)) 39 return -EOPNOTSUPP; 40 return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_USER, 41 name, buffer, size); 42 } 43 44 static int 45 ext4_xattr_user_set(const struct xattr_handler *handler, 46 struct dentry *dentry, const char *name, 47 const void *value, size_t size, int flags) 48 { 49 if (!test_opt(dentry->d_sb, XATTR_USER)) 50 return -EOPNOTSUPP; 51 return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_USER, 52 name, value, size, flags); 53 } 54 55 const struct xattr_handler ext4_xattr_user_handler = { 56 .prefix = XATTR_USER_PREFIX, 57 .list = ext4_xattr_user_list, 58 .get = ext4_xattr_user_get, 59 .set = ext4_xattr_user_set, 60 }; 61