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 VOLUME_DIRTY 0x0002 18 #define MEDIA_FAILURE 0x0004 19 20 #define EXFAT_EOF_CLUSTER 0xFFFFFFFFu 21 #define EXFAT_BAD_CLUSTER 0xFFFFFFF7u 22 #define EXFAT_FREE_CLUSTER 0 23 /* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */ 24 #define EXFAT_RESERVED_CLUSTERS 2 25 #define EXFAT_FIRST_CLUSTER 2 26 #define EXFAT_DATA_CLUSTER_COUNT(sbi) \ 27 ((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS) 28 29 /* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */ 30 #define ALLOC_POSSIBLE 0x01 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 #define EXFAT_VENDOR_EXT 0xE0 /* vendor extension entry */ 55 #define EXFAT_VENDOR_ALLOC 0xE1 /* vendor allocation entry */ 56 57 #define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0) 58 #define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0) 59 #define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0) 60 61 /* checksum types */ 62 #define CS_DIR_ENTRY 0 63 #define CS_BOOT_SECTOR 1 64 #define CS_DEFAULT 2 65 66 /* file attributes */ 67 #define ATTR_READONLY 0x0001 68 #define ATTR_HIDDEN 0x0002 69 #define ATTR_SYSTEM 0x0004 70 #define ATTR_VOLUME 0x0008 71 #define ATTR_SUBDIR 0x0010 72 #define ATTR_ARCHIVE 0x0020 73 74 #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ 75 ATTR_SUBDIR | ATTR_ARCHIVE) 76 77 #define BOOTSEC_JUMP_BOOT_LEN 3 78 #define BOOTSEC_FS_NAME_LEN 8 79 #define BOOTSEC_OLDBPB_LEN 53 80 81 #define EXFAT_FILE_NAME_LEN 15 82 83 #define EXFAT_MIN_SECT_SIZE_BITS 9 84 #define EXFAT_MAX_SECT_SIZE_BITS 12 85 #define EXFAT_MAX_SECT_PER_CLUS_BITS(x) (25 - (x)->sect_size_bits) 86 87 /* EXFAT: Main and Backup Boot Sector (512 bytes) */ 88 struct boot_sector { 89 __u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN]; 90 __u8 fs_name[BOOTSEC_FS_NAME_LEN]; 91 __u8 must_be_zero[BOOTSEC_OLDBPB_LEN]; 92 __le64 partition_offset; 93 __le64 vol_length; 94 __le32 fat_offset; 95 __le32 fat_length; 96 __le32 clu_offset; 97 __le32 clu_count; 98 __le32 root_cluster; 99 __le32 vol_serial; 100 __u8 fs_revision[2]; 101 __le16 vol_flags; 102 __u8 sect_size_bits; 103 __u8 sect_per_clus_bits; 104 __u8 num_fats; 105 __u8 drv_sel; 106 __u8 percent_in_use; 107 __u8 reserved[7]; 108 __u8 boot_code[390]; 109 __le16 signature; 110 } __packed; 111 112 struct exfat_dentry { 113 __u8 type; 114 union { 115 struct { 116 __u8 num_ext; 117 __le16 checksum; 118 __le16 attr; 119 __le16 reserved1; 120 __le16 create_time; 121 __le16 create_date; 122 __le16 modify_time; 123 __le16 modify_date; 124 __le16 access_time; 125 __le16 access_date; 126 __u8 create_time_cs; 127 __u8 modify_time_cs; 128 __u8 create_tz; 129 __u8 modify_tz; 130 __u8 access_tz; 131 __u8 reserved2[7]; 132 } __packed file; /* file directory entry */ 133 struct { 134 __u8 flags; 135 __u8 reserved1; 136 __u8 name_len; 137 __le16 name_hash; 138 __le16 reserved2; 139 __le64 valid_size; 140 __le32 reserved3; 141 __le32 start_clu; 142 __le64 size; 143 } __packed stream; /* stream extension directory entry */ 144 struct { 145 __u8 flags; 146 __le16 unicode_0_14[EXFAT_FILE_NAME_LEN]; 147 } __packed name; /* file name directory entry */ 148 struct { 149 __u8 flags; 150 __u8 reserved[18]; 151 __le32 start_clu; 152 __le64 size; 153 } __packed bitmap; /* allocation bitmap directory entry */ 154 struct { 155 __u8 reserved1[3]; 156 __le32 checksum; 157 __u8 reserved2[12]; 158 __le32 start_clu; 159 __le64 size; 160 } __packed upcase; /* up-case table directory entry */ 161 struct { 162 __u8 flags; 163 __u8 vendor_guid[16]; 164 __u8 vendor_defined[14]; 165 } __packed vendor_ext; /* vendor extension directory entry */ 166 struct { 167 __u8 flags; 168 __u8 vendor_guid[16]; 169 __u8 vendor_defined[2]; 170 __le32 start_clu; 171 __le64 size; 172 } __packed vendor_alloc; /* vendor allocation directory entry */ 173 struct { 174 __u8 flags; 175 __u8 custom_defined[18]; 176 __le32 start_clu; 177 __le64 size; 178 } __packed generic_secondary; /* generic secondary directory entry */ 179 } __packed dentry; 180 } __packed; 181 182 #define EXFAT_TZ_VALID (1 << 7) 183 184 /* Jan 1 GMT 00:00:00 1980 */ 185 #define EXFAT_MIN_TIMESTAMP_SECS 315532800LL 186 /* Dec 31 GMT 23:59:59 2107 */ 187 #define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL 188 189 #endif /* !_EXFAT_RAW_H */ 190