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 (at) huawei.com> 9 * Liu Shuoran <liushuoran (at) huawei.com> 10 * Jaegeuk Kim <jaegeuk (at) 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_KEY_DESCRIPTOR_SIZE 8 38 #define FS_KEY_DERIVATION_NONCE_SIZE 16 39 40 struct fscrypt_context { 41 u8 format; 42 u8 contents_encryption_mode; 43 u8 filenames_encryption_mode; 44 u8 flags; 45 u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE]; 46 u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE]; 47 } __attribute__((packed)); 48 49 #define F2FS_ACL_VERSION 0x0001 50 51 struct f2fs_acl_entry { 52 __le16 e_tag; 53 __le16 e_perm; 54 __le32 e_id; 55 }; 56 57 struct f2fs_acl_entry_short { 58 __le16 e_tag; 59 __le16 e_perm; 60 }; 61 62 struct f2fs_acl_header { 63 __le32 a_version; 64 }; 65 66 static inline int f2fs_acl_count(int size) 67 { 68 ssize_t s; 69 size -= sizeof(struct f2fs_acl_header); 70 s = size - 4 * sizeof(struct f2fs_acl_entry_short); 71 if (s < 0) { 72 if (size % sizeof(struct f2fs_acl_entry_short)) 73 return -1; 74 return size / sizeof(struct f2fs_acl_entry_short); 75 } else { 76 if (s % sizeof(struct f2fs_acl_entry)) 77 return -1; 78 return s / sizeof(struct f2fs_acl_entry) + 4; 79 } 80 } 81 82 #ifndef XATTR_USER_PREFIX 83 #define XATTR_USER_PREFIX "user." 84 #endif 85 #ifndef XATTR_SECURITY_PREFIX 86 #define XATTR_SECURITY_PREFIX "security." 87 #endif 88 #ifndef XATTR_TRUSTED_PREFIX 89 #define XATTR_TRUSTED_PREFIX "trusted." 90 #endif 91 92 #ifndef XATTR_CREATE 93 #define XATTR_CREATE 0x1 94 #endif 95 #ifndef XATTR_REPLACE 96 #define XATTR_REPLACE 0x2 97 #endif 98 99 #define XATTR_ROUND (3) 100 101 #define XATTR_SELINUX_SUFFIX "selinux" 102 #define F2FS_XATTR_INDEX_USER 1 103 #define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2 104 #define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3 105 #define F2FS_XATTR_INDEX_TRUSTED 4 106 #define F2FS_XATTR_INDEX_LUSTRE 5 107 #define F2FS_XATTR_INDEX_SECURITY 6 108 #define F2FS_XATTR_INDEX_ENCRYPTION 9 109 110 #define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) 111 112 #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) 113 #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) 114 #define F2FS_XATTR_MAGIC 0xF2F52011 115 116 #define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *) ((char *)(entry) +\ 117 ENTRY_SIZE(entry))) 118 #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1)) 119 120 #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) 121 122 #define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \ 123 entry->e_name_len + le16_to_cpu(entry->e_value_size))) 124 125 #define list_for_each_xattr(entry, addr) \ 126 for (entry = XATTR_FIRST_ENTRY(addr); \ 127 !IS_XATTR_LAST_ENTRY(entry); \ 128 entry = XATTR_NEXT_ENTRY(entry)) 129 130 #define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \ 131 sizeof(struct node_footer) - sizeof(__u32)) 132 133 #define MAX_VALUE_LEN (MIN_OFFSET - \ 134 sizeof(struct f2fs_xattr_header) - \ 135 sizeof(struct f2fs_xattr_entry)) 136 137 #endif 138
