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 PBR_SIGNATURE 0xAA55 12 13 #define EXFAT_MAX_FILE_LEN 255 14 15 #define VOL_CLEAN 0x0000 16 #define VOL_DIRTY 0x0002 17 18 #define EXFAT_EOF_CLUSTER 0xFFFFFFFFu 19 #define EXFAT_BAD_CLUSTER 0xFFFFFFF7u 20 #define EXFAT_FREE_CLUSTER 0 21 /* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */ 22 #define EXFAT_RESERVED_CLUSTERS 2 23 #define EXFAT_FIRST_CLUSTER 2 24 #define EXFAT_DATA_CLUSTER_COUNT(sbi) \ 25 ((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS) 26 27 /* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */ 28 #define ALLOC_FAT_CHAIN 0x01 29 #define ALLOC_NO_FAT_CHAIN 0x03 30 31 #define DENTRY_SIZE 32 /* directory entry size */ 32 #define DENTRY_SIZE_BITS 5 33 /* exFAT allows 8388608(256MB) directory entries */ 34 #define MAX_EXFAT_DENTRIES 8388608 35 36 /* dentry types */ 37 #define EXFAT_UNUSED 0x00 /* end of directory */ 38 #define EXFAT_DELETE (~0x80) 39 #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ 40 #define EXFAT_INVAL 0x80 /* invalid value */ 41 #define EXFAT_BITMAP 0x81 /* allocation bitmap */ 42 #define EXFAT_UPCASE 0x82 /* upcase table */ 43 #define EXFAT_VOLUME 0x83 /* volume label */ 44 #define EXFAT_FILE 0x85 /* file or dir */ 45 #define EXFAT_GUID 0xA0 46 #define EXFAT_PADDING 0xA1 47 #define EXFAT_ACLTAB 0xA2 48 #define EXFAT_STREAM 0xC0 /* stream entry */ 49 #define EXFAT_NAME 0xC1 /* file name entry */ 50 #define EXFAT_ACL 0xC2 /* stream entry */ 51 52 #define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0) 53 #define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0) 54 #define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0) 55 56 /* checksum types */ 57 #define CS_DIR_ENTRY 0 58 #define CS_PBR_SECTOR 1 59 #define CS_DEFAULT 2 60 61 /* file attributes */ 62 #define ATTR_READONLY 0x0001 63 #define ATTR_HIDDEN 0x0002 64 #define ATTR_SYSTEM 0x0004 65 #define ATTR_VOLUME 0x0008 66 #define ATTR_SUBDIR 0x0010 67 #define ATTR_ARCHIVE 0x0020 68 69 #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ 70 ATTR_SUBDIR | ATTR_ARCHIVE) 71 72 #define PBR64_JUMP_BOOT_LEN 3 73 #define PBR64_OEM_NAME_LEN 8 74 #define PBR64_RESERVED_LEN 53 75 76 #define EXFAT_FILE_NAME_LEN 15 77 78 /* EXFAT BIOS parameter block (64 bytes) */ 79 struct bpb64 { 80 __u8 jmp_boot[PBR64_JUMP_BOOT_LEN]; 81 __u8 oem_name[PBR64_OEM_NAME_LEN]; 82 __u8 res_zero[PBR64_RESERVED_LEN]; 83 } __packed; 84 85 /* EXFAT EXTEND BIOS parameter block (56 bytes) */ 86 struct bsx64 { 87 __le64 vol_offset; 88 __le64 vol_length; 89 __le32 fat_offset; 90 __le32 fat_length; 91 __le32 clu_offset; 92 __le32 clu_count; 93 __le32 root_cluster; 94 __le32 vol_serial; 95 __u8 fs_version[2]; 96 __le16 vol_flags; 97 __u8 sect_size_bits; 98 __u8 sect_per_clus_bits; 99 __u8 num_fats; 100 __u8 phy_drv_no; 101 __u8 perc_in_use; 102 __u8 reserved2[7]; 103 } __packed; 104 105 /* EXFAT PBR[BPB+BSX] (120 bytes) */ 106 struct pbr64 { 107 struct bpb64 bpb; 108 struct bsx64 bsx; 109 } __packed; 110 111 /* Common PBR[Partition Boot Record] (512 bytes) */ 112 struct pbr { 113 union { 114 __u8 raw[64]; 115 struct bpb64 f64; 116 } bpb; 117 union { 118 __u8 raw[56]; 119 struct bsx64 f64; 120 } bsx; 121 __u8 boot_code[390]; 122 __le16 signature; 123 } __packed; 124 125 struct exfat_dentry { 126 __u8 type; 127 union { 128 struct { 129 __u8 num_ext; 130 __le16 checksum; 131 __le16 attr; 132 __le16 reserved1; 133 __le16 create_time; 134 __le16 create_date; 135 __le16 modify_time; 136 __le16 modify_date; 137 __le16 access_time; 138 __le16 access_date; 139 __u8 create_time_ms; 140 __u8 modify_time_ms; 141 __u8 create_tz; 142 __u8 modify_tz; 143 __u8 access_tz; 144 __u8 reserved2[7]; 145 } __packed file; /* file directory entry */ 146 struct { 147 __u8 flags; 148 __u8 reserved1; 149 __u8 name_len; 150 __le16 name_hash; 151 __le16 reserved2; 152 __le64 valid_size; 153 __le32 reserved3; 154 __le32 start_clu; 155 __le64 size; 156 } __packed stream; /* stream extension directory entry */ 157 struct { 158 __u8 flags; 159 __le16 unicode_0_14[EXFAT_FILE_NAME_LEN]; 160 } __packed name; /* file name directory entry */ 161 struct { 162 __u8 flags; 163 __u8 reserved[18]; 164 __le32 start_clu; 165 __le64 size; 166 } __packed bitmap; /* allocation bitmap directory entry */ 167 struct { 168 __u8 reserved1[3]; 169 __le32 checksum; 170 __u8 reserved2[12]; 171 __le32 start_clu; 172 __le64 size; 173 } __packed upcase; /* up-case table directory entry */ 174 } __packed dentry; 175 } __packed; 176 177 #define EXFAT_TZ_VALID (1 << 7) 178 179 /* Jan 1 GMT 00:00:00 1980 */ 180 #define EXFAT_MIN_TIMESTAMP_SECS 315532800LL 181 /* Dec 31 GMT 23:59:59 2107 */ 182 #define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL 183 184 #endif /* !_EXFAT_RAW_H */ 185