1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6 #ifndef _EXFAT_RAW_H 7 #define _EXFAT_RAW_H 8 9 #include <linux/types.h> 10 11 #define BOOT_SIGNATURE 0xAA55 12 #define EXBOOT_SIGNATURE 0xAA550000 13 #define STR_EXFAT "EXFAT " /* size should be 8 */ 14 15 #define EXFAT_MAX_FILE_LEN 255 16 17 #define VOL_CLEAN 0x0000 18 #define VOL_DIRTY 0x0002 19 #define ERR_MEDIUM 0x0004 20 21 #define EXFAT_EOF_CLUSTER 0xFFFFFFFFu 22 #define EXFAT_BAD_CLUSTER 0xFFFFFFF7u 23 #define EXFAT_FREE_CLUSTER 0 24 /* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */ 25 #define EXFAT_RESERVED_CLUSTERS 2 26 #define EXFAT_FIRST_CLUSTER 2 27 #define EXFAT_DATA_CLUSTER_COUNT(sbi) \ 28 ((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS) 29 30 /* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */ 31 #define ALLOC_FAT_CHAIN 0x01 32 #define ALLOC_NO_FAT_CHAIN 0x03 33 34 #define DENTRY_SIZE 32 /* directory entry size */ 35 #define DENTRY_SIZE_BITS 5 36 /* exFAT allows 8388608(256MB) directory entries */ 37 #define MAX_EXFAT_DENTRIES 8388608 38 39 /* dentry types */ 40 #define EXFAT_UNUSED 0x00 /* end of directory */ 41 #define EXFAT_DELETE (~0x80) 42 #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ 43 #define EXFAT_INVAL 0x80 /* invalid value */ 44 #define EXFAT_BITMAP 0x81 /* allocation bitmap */ 45 #define EXFAT_UPCASE 0x82 /* upcase table */ 46 #define EXFAT_VOLUME 0x83 /* volume label */ 47 #define EXFAT_FILE 0x85 /* file or dir */ 48 #define EXFAT_GUID 0xA0 49 #define EXFAT_PADDING 0xA1 50 #define EXFAT_ACLTAB 0xA2 51 #define EXFAT_STREAM 0xC0 /* stream entry */ 52 #define EXFAT_NAME 0xC1 /* file name entry */ 53 #define EXFAT_ACL 0xC2 /* stream entry */ 54 55 #define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0) 56 #define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0) 57 #define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0) 58 59 /* checksum types */ 60 #define CS_DIR_ENTRY 0 61 #define CS_BOOT_SECTOR 1 62 #define CS_DEFAULT 2 63 64 /* file attributes */ 65 #define ATTR_READONLY 0x0001 66 #define ATTR_HIDDEN 0x0002 67 #define ATTR_SYSTEM 0x0004 68 #define ATTR_VOLUME 0x0008 69 #define ATTR_SUBDIR 0x0010 70 #define ATTR_ARCHIVE 0x0020 71 72 #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ 73 ATTR_SUBDIR | ATTR_ARCHIVE) 74 75 #define BOOTSEC_JUMP_BOOT_LEN 3 76 #define BOOTSEC_FS_NAME_LEN 8 77 #define BOOTSEC_OLDBPB_LEN 53 78 79 #define EXFAT_FILE_NAME_LEN 15 80 81 /* EXFAT: Main and Backup Boot Sector (512 bytes) */ 82 struct boot_sector { 83 __u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN]; 84 __u8 fs_name[BOOTSEC_FS_NAME_LEN]; 85 __u8 must_be_zero[BOOTSEC_OLDBPB_LEN]; 86 __le64 partition_offset; 87 __le64 vol_length; 88 __le32 fat_offset; 89 __le32 fat_length; 90 __le32 clu_offset; 91 __le32 clu_count; 92 __le32 root_cluster; 93 __le32 vol_serial; 94 __u8 fs_revision[2]; 95 __le16 vol_flags; 96 __u8 sect_size_bits; 97 __u8 sect_per_clus_bits; 98 __u8 num_fats; 99 __u8 drv_sel; 100 __u8 percent_in_use; 101 __u8 reserved[7]; 102 __u8 boot_code[390]; 103 __le16 signature; 104 } __packed; 105 106 struct exfat_dentry { 107 __u8 type; 108 union { 109 struct { 110 __u8 num_ext; 111 __le16 checksum; 112 __le16 attr; 113 __le16 reserved1; 114 __le16 create_time; 115 __le16 create_date; 116 __le16 modify_time; 117 __le16 modify_date; 118 __le16 access_time; 119 __le16 access_date; 120 __u8 create_time_cs; 121 __u8 modify_time_cs; 122 __u8 create_tz; 123 __u8 modify_tz; 124 __u8 access_tz; 125 __u8 reserved2[7]; 126 } __packed file; /* file directory entry */ 127 struct { 128 __u8 flags; 129 __u8 reserved1; 130 __u8 name_len; 131 __le16 name_hash; 132 __le16 reserved2; 133 __le64 valid_size; 134 __le32 reserved3; 135 __le32 start_clu; 136 __le64 size; 137 } __packed stream; /* stream extension directory entry */ 138 struct { 139 __u8 flags; 140 __le16 unicode_0_14[EXFAT_FILE_NAME_LEN]; 141 } __packed name; /* file name directory entry */ 142 struct { 143 __u8 flags; 144 __u8 reserved[18]; 145 __le32 start_clu; 146 __le64 size; 147 } __packed bitmap; /* allocation bitmap directory entry */ 148 struct { 149 __u8 reserved1[3]; 150 __le32 checksum; 151 __u8 reserved2[12]; 152 __le32 start_clu; 153 __le64 size; 154 } __packed upcase; /* up-case table directory entry */ 155 } __packed dentry; 156 } __packed; 157 158 #define EXFAT_TZ_VALID (1 << 7) 159 160 /* Jan 1 GMT 00:00:00 1980 */ 161 #define EXFAT_MIN_TIMESTAMP_SECS 315532800LL 162 /* Dec 31 GMT 23:59:59 2107 */ 163 #define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL 164 165 #endif /* !_EXFAT_RAW_H */ 166