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 } __attribute__((packed)); 49 50 #define F2FS_ACL_VERSION 0x0001 51 52 struct f2fs_acl_entry { 53 __le16 e_tag; 54 __le16 e_perm; 55 __le32 e_id; 56 }; 57 58 struct f2fs_acl_entry_short { 59 __le16 e_tag; 60 __le16 e_perm; 61 }; 62 63 struct f2fs_acl_header { 64 __le32 a_version; 65 }; 66 f2fs_acl_count(int size)67static inline int f2fs_acl_count(int size) 68 { 69 ssize_t s; 70 size -= sizeof(struct f2fs_acl_header); 71 s = size - 4 * sizeof(struct f2fs_acl_entry_short); 72 if (s < 0) { 73 if (size % sizeof(struct f2fs_acl_entry_short)) 74 return -1; 75 return size / sizeof(struct f2fs_acl_entry_short); 76 } else { 77 if (s % sizeof(struct f2fs_acl_entry)) 78 return -1; 79 return s / sizeof(struct f2fs_acl_entry) + 4; 80 } 81 } 82 83 #ifndef XATTR_USER_PREFIX 84 #define XATTR_USER_PREFIX "user." 85 #endif 86 #ifndef XATTR_SECURITY_PREFIX 87 #define XATTR_SECURITY_PREFIX "security." 88 #endif 89 #ifndef XATTR_TRUSTED_PREFIX 90 #define XATTR_TRUSTED_PREFIX "trusted." 91 #endif 92 93 #ifndef XATTR_CREATE 94 #define XATTR_CREATE 0x1 95 #endif 96 #ifndef XATTR_REPLACE 97 #define XATTR_REPLACE 0x2 98 #endif 99 100 #define XATTR_ROUND (3) 101 102 #define XATTR_SELINUX_SUFFIX "selinux" 103 #define F2FS_XATTR_INDEX_USER 1 104 #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 105 #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 106 #define F2FS_XATTR_INDEX_TRUSTED 4 107 #define F2FS_XATTR_INDEX_LUSTRE 5 108 #define F2FS_XATTR_INDEX_SECURITY 6 109 #define F2FS_XATTR_INDEX_ENCRYPTION 9 110 111 #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 112 113 #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 114 #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 115 #define F2FS_XATTR_MAGIC 0xF2F52011 116 117 #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *) ((char *)(entry) +\ 118 ENTRY_SIZE(entry))) 119 #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 120 121 #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) 122 123 #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 124 entry->e_name_len + le16_to_cpu(entry->e_value_size))) 125 126 #define list_for_each_xattr(entry, addr) \ 127 for (entry = XATTR_FIRST_ENTRY(addr); \ 128 !IS_XATTR_LAST_ENTRY(entry); \ 129 entry = XATTR_NEXT_ENTRY(entry)) 130 131 #define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \ 132 sizeof(struct node_footer) - sizeof(__u32)) 133 134 #define MAX_VALUE_LEN (MIN_OFFSET - \ 135 sizeof(struct f2fs_xattr_header) - \ 136 sizeof(struct f2fs_xattr_entry)) 137 138 #define MAX_INLINE_XATTR_SIZE \ 139 (DEF_ADDRS_PER_INODE - \ 140 F2FS_TOTAL_EXTRA_ATTR_SIZE / sizeof(__le32) - \ 141 DEF_INLINE_RESERVED_SIZE - \ 142 MIN_INLINE_DENTRY_SIZE / sizeof(__le32)) 143 #endif 144