1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/xattr_user.c 3ac27a0ecSDave Kleikamp * Handler for extended user attributes. 4ac27a0ecSDave Kleikamp * 5ac27a0ecSDave Kleikamp * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org> 6ac27a0ecSDave Kleikamp */ 7ac27a0ecSDave Kleikamp 8ac27a0ecSDave Kleikamp #include <linux/module.h> 9ac27a0ecSDave Kleikamp #include <linux/string.h> 10ac27a0ecSDave Kleikamp #include <linux/fs.h> 113dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 123dcf5451SChristoph Hellwig #include "ext4.h" 13ac27a0ecSDave Kleikamp #include "xattr.h" 14ac27a0ecSDave Kleikamp 15ac27a0ecSDave Kleikamp static size_t 16431547b3SChristoph Hellwig ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size, 17431547b3SChristoph Hellwig const char *name, size_t name_len, int type) 18ac27a0ecSDave Kleikamp { 193537576aSShen Feng const size_t prefix_len = XATTR_USER_PREFIX_LEN; 20ac27a0ecSDave Kleikamp const size_t total_len = prefix_len + name_len + 1; 21ac27a0ecSDave Kleikamp 22431547b3SChristoph Hellwig if (!test_opt(dentry->d_sb, XATTR_USER)) 23ac27a0ecSDave Kleikamp return 0; 24ac27a0ecSDave Kleikamp 25ac27a0ecSDave Kleikamp if (list && total_len <= list_size) { 26ac27a0ecSDave Kleikamp memcpy(list, XATTR_USER_PREFIX, prefix_len); 27ac27a0ecSDave Kleikamp memcpy(list+prefix_len, name, name_len); 28ac27a0ecSDave Kleikamp list[prefix_len + name_len] = '\0'; 29ac27a0ecSDave Kleikamp } 30ac27a0ecSDave Kleikamp return total_len; 31ac27a0ecSDave Kleikamp } 32ac27a0ecSDave Kleikamp 33ac27a0ecSDave Kleikamp static int 34431547b3SChristoph Hellwig ext4_xattr_user_get(struct dentry *dentry, const char *name, 35431547b3SChristoph Hellwig void *buffer, size_t size, int type) 36ac27a0ecSDave Kleikamp { 37ac27a0ecSDave Kleikamp if (strcmp(name, "") == 0) 38ac27a0ecSDave Kleikamp return -EINVAL; 39431547b3SChristoph Hellwig if (!test_opt(dentry->d_sb, XATTR_USER)) 40ac27a0ecSDave Kleikamp return -EOPNOTSUPP; 41431547b3SChristoph Hellwig return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER, 42431547b3SChristoph Hellwig name, buffer, size); 43ac27a0ecSDave Kleikamp } 44ac27a0ecSDave Kleikamp 45ac27a0ecSDave Kleikamp static int 46431547b3SChristoph Hellwig ext4_xattr_user_set(struct dentry *dentry, const char *name, 47431547b3SChristoph Hellwig const void *value, size_t size, int flags, int type) 48ac27a0ecSDave Kleikamp { 49ac27a0ecSDave Kleikamp if (strcmp(name, "") == 0) 50ac27a0ecSDave Kleikamp return -EINVAL; 51431547b3SChristoph Hellwig if (!test_opt(dentry->d_sb, XATTR_USER)) 52ac27a0ecSDave Kleikamp return -EOPNOTSUPP; 53431547b3SChristoph Hellwig return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER, 54431547b3SChristoph Hellwig name, value, size, flags); 55ac27a0ecSDave Kleikamp } 56ac27a0ecSDave Kleikamp 5711e27528SStephen Hemminger const struct xattr_handler ext4_xattr_user_handler = { 58ac27a0ecSDave Kleikamp .prefix = XATTR_USER_PREFIX, 59617ba13bSMingming Cao .list = ext4_xattr_user_list, 60617ba13bSMingming Cao .get = ext4_xattr_user_get, 61617ba13bSMingming Cao .set = ext4_xattr_user_set, 62ac27a0ecSDave Kleikamp }; 63