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(const struct xattr_handler *handler, 15 struct dentry *dentry, char *list, size_t list_size, 16 const char *name, size_t name_len) 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 ext2_xattr_user_get(const struct xattr_handler *handler, 34 struct dentry *dentry, const char *name, 35 void *buffer, size_t size) 36 { 37 if (strcmp(name, "") == 0) 38 return -EINVAL; 39 if (!test_opt(dentry->d_sb, XATTR_USER)) 40 return -EOPNOTSUPP; 41 return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_USER, 42 name, buffer, size); 43 } 44 45 static int 46 ext2_xattr_user_set(const struct xattr_handler *handler, 47 struct dentry *dentry, 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(dentry->d_sb, XATTR_USER)) 53 return -EOPNOTSUPP; 54 55 return ext2_xattr_set(d_inode(dentry), EXT2_XATTR_INDEX_USER, 56 name, value, size, flags); 57 } 58 59 const struct xattr_handler ext2_xattr_user_handler = { 60 .prefix = XATTR_USER_PREFIX, 61 .list = ext2_xattr_user_list, 62 .get = ext2_xattr_user_get, 63 .set = ext2_xattr_user_set, 64 }; 65