1 /** 2 * xattr.h 3 * 4 * Many parts of codes are copied from Linux kernel/fs/f2fs. 5 * 6 * Copyright (C) 2015 Huawei Ltd. 7 * Witten by: 8 * Hou Pengyang <houpengyang@huawei.com> 9 * Liu Shuoran <liushuoran@huawei.com> 10 * Jaegeuk Kim <jaegeuk@kernel.org> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 #ifndef _XATTR_H_ 17 #define _XATTR_H_ 18 19 #include "f2fs.h" 20 #ifdef HAVE_SYS_XATTR_H 21 #include <sys/xattr.h> 22 #endif 23 24 struct f2fs_xattr_header { 25 __le32 h_magic; /* magic number for identification */ 26 __le32 h_refcount; /* reference count */ 27 __u32 h_sloadd[4]; /* zero right now */ 28 }; 29 30 struct f2fs_xattr_entry { 31 __u8 e_name_index; 32 __u8 e_name_len; 33 __le16 e_value_size; /* size of attribute value */ 34 char e_name[0]; /* attribute name */ 35 }; 36 37 #define FS_ENCRYPTION_CONTEXT_FORMAT_V1 1 38 #define FS_KEY_DESCRIPTOR_SIZE 8 39 #define FS_KEY_DERIVATION_NONCE_SIZE 16 40 41 struct fscrypt_context { 42 u8 format; 43 u8 contents_encryption_mode; 44 u8 filenames_encryption_mode; 45 u8 flags; 46 u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; 47 u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE]; 48 }; 49 50 static_assert(sizeof(struct fscrypt_context) == 28, ""); 51 52 #define F2FS_ACL_VERSION 0x0001 53 54 struct f2fs_acl_entry { 55 __le16 e_tag; 56 __le16 e_perm; 57 __le32 e_id; 58 }; 59 60 struct f2fs_acl_entry_short { 61 __le16 e_tag; 62 __le16 e_perm; 63 }; 64 65 struct f2fs_acl_header { 66 __le32 a_version; 67 }; 68 f2fs_acl_count(int size)69static inline int f2fs_acl_count(int size) 70 { 71 ssize_t s; 72 size -= sizeof(struct f2fs_acl_header); 73 s = size - 4 * sizeof(struct f2fs_acl_entry_short); 74 if (s < 0) { 75 if (size % sizeof(struct f2fs_acl_entry_short)) 76 return -1; 77 return size / sizeof(struct f2fs_acl_entry_short); 78 } else { 79 if (s % sizeof(struct f2fs_acl_entry)) 80 return -1; 81 return s / sizeof(struct f2fs_acl_entry) + 4; 82 } 83 } 84 85 #ifndef XATTR_USER_PREFIX 86 #define XATTR_USER_PREFIX "user." 87 #endif 88 #ifndef XATTR_SECURITY_PREFIX 89 #define XATTR_SECURITY_PREFIX "security." 90 #endif 91 #ifndef XATTR_TRUSTED_PREFIX 92 #define XATTR_TRUSTED_PREFIX "trusted." 93 #endif 94 95 #ifndef XATTR_CREATE 96 #define XATTR_CREATE 0x1 97 #endif 98 #ifndef XATTR_REPLACE 99 #define XATTR_REPLACE 0x2 100 #endif 101 102 #define XATTR_ROUND (3) 103 104 #define XATTR_SELINUX_SUFFIX "selinux" 105 #define F2FS_XATTR_INDEX_USER 1 106 #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 107 #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 108 #define F2FS_XATTR_INDEX_TRUSTED 4 109 #define F2FS_XATTR_INDEX_LUSTRE 5 110 #define F2FS_XATTR_INDEX_SECURITY 6 111 #define F2FS_XATTR_INDEX_ENCRYPTION 9 112 113 #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 114 115 #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 116 #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 117 #define F2FS_XATTR_MAGIC 0xF2F52011 118 119 #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *) ((char *)(entry) +\ 120 ENTRY_SIZE(entry))) 121 #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 122 123 #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) 124 125 #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 126 entry->e_name_len + le16_to_cpu(entry->e_value_size))) 127 128 #define list_for_each_xattr(entry, addr) \ 129 for (entry = XATTR_FIRST_ENTRY(addr); \ 130 !IS_XATTR_LAST_ENTRY(entry); \ 131 entry = XATTR_NEXT_ENTRY(entry)) 132 133 #define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \ 134 sizeof(struct node_footer) - sizeof(__u32)) 135 136 #define MAX_VALUE_LEN (MIN_OFFSET - \ 137 sizeof(struct f2fs_xattr_header) - \ 138 sizeof(struct f2fs_xattr_entry)) 139 140 #define MAX_INLINE_XATTR_SIZE \ 141 (DEF_ADDRS_PER_INODE - \ 142 F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \ 143 DEF_INLINE_RESERVED_SIZE - \ 144 MIN_INLINE_DENTRY_SIZE / sizeof(__le32)) 145 #endif 146