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_FAT_CHAIN 0x01 31 #define ALLOC_NO_FAT_CHAIN 0x03 32 33 #define DENTRY_SIZE 32 /* directory entry size */ 34 #define DENTRY_SIZE_BITS 5 35 /* exFAT allows 8388608(256MB) directory entries */ 36 #define MAX_EXFAT_DENTRIES 8388608 37 38 /* dentry types */ 39 #define EXFAT_UNUSED 0x00 /* end of directory */ 40 #define EXFAT_DELETE (~0x80) 41 #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ 42 #define EXFAT_INVAL 0x80 /* invalid value */ 43 #define EXFAT_BITMAP 0x81 /* allocation bitmap */ 44 #define EXFAT_UPCASE 0x82 /* upcase table */ 45 #define EXFAT_VOLUME 0x83 /* volume label */ 46 #define EXFAT_FILE 0x85 /* file or dir */ 47 #define EXFAT_GUID 0xA0 48 #define EXFAT_PADDING 0xA1 49 #define EXFAT_ACLTAB 0xA2 50 #define EXFAT_STREAM 0xC0 /* stream entry */ 51 #define EXFAT_NAME 0xC1 /* file name entry */ 52 #define EXFAT_ACL 0xC2 /* stream entry */ 53 54 #define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0) 55 #define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0) 56 #define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0) 57 58 /* checksum types */ 59 #define CS_DIR_ENTRY 0 60 #define CS_BOOT_SECTOR 1 61 #define CS_DEFAULT 2 62 63 /* file attributes */ 64 #define ATTR_READONLY 0x0001 65 #define ATTR_HIDDEN 0x0002 66 #define ATTR_SYSTEM 0x0004 67 #define ATTR_VOLUME 0x0008 68 #define ATTR_SUBDIR 0x0010 69 #define ATTR_ARCHIVE 0x0020 70 71 #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ 72 ATTR_SUBDIR | ATTR_ARCHIVE) 73 74 #define BOOTSEC_JUMP_BOOT_LEN 3 75 #define BOOTSEC_FS_NAME_LEN 8 76 #define BOOTSEC_OLDBPB_LEN 53 77 78 #define EXFAT_FILE_NAME_LEN 15 79 80 #define EXFAT_MIN_SECT_SIZE_BITS 9 81 #define EXFAT_MAX_SECT_SIZE_BITS 12 82 #define EXFAT_MAX_SECT_PER_CLUS_BITS(x) (25 - (x)->sect_size_bits) 83 84 /* EXFAT: Main and Backup Boot Sector (512 bytes) */ 85 struct boot_sector { 86 __u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN]; 87 __u8 fs_name[BOOTSEC_FS_NAME_LEN]; 88 __u8 must_be_zero[BOOTSEC_OLDBPB_LEN]; 89 __le64 partition_offset; 90 __le64 vol_length; 91 __le32 fat_offset; 92 __le32 fat_length; 93 __le32 clu_offset; 94 __le32 clu_count; 95 __le32 root_cluster; 96 __le32 vol_serial; 97 __u8 fs_revision[2]; 98 __le16 vol_flags; 99 __u8 sect_size_bits; 100 __u8 sect_per_clus_bits; 101 __u8 num_fats; 102 __u8 drv_sel; 103 __u8 percent_in_use; 104 __u8 reserved[7]; 105 __u8 boot_code[390]; 106 __le16 signature; 107 } __packed; 108 109 struct exfat_dentry { 110 __u8 type; 111 union { 112 struct { 113 __u8 num_ext; 114 __le16 checksum; 115 __le16 attr; 116 __le16 reserved1; 117 __le16 create_time; 118 __le16 create_date; 119 __le16 modify_time; 120 __le16 modify_date; 121 __le16 access_time; 122 __le16 access_date; 123 __u8 create_time_cs; 124 __u8 modify_time_cs; 125 __u8 create_tz; 126 __u8 modify_tz; 127 __u8 access_tz; 128 __u8 reserved2[7]; 129 } __packed file; /* file directory entry */ 130 struct { 131 __u8 flags; 132 __u8 reserved1; 133 __u8 name_len; 134 __le16 name_hash; 135 __le16 reserved2; 136 __le64 valid_size; 137 __le32 reserved3; 138 __le32 start_clu; 139 __le64 size; 140 } __packed stream; /* stream extension directory entry */ 141 struct { 142 __u8 flags; 143 __le16 unicode_0_14[EXFAT_FILE_NAME_LEN]; 144 } __packed name; /* file name directory entry */ 145 struct { 146 __u8 flags; 147 __u8 reserved[18]; 148 __le32 start_clu; 149 __le64 size; 150 } __packed bitmap; /* allocation bitmap directory entry */ 151 struct { 152 __u8 reserved1[3]; 153 __le32 checksum; 154 __u8 reserved2[12]; 155 __le32 start_clu; 156 __le64 size; 157 } __packed upcase; /* up-case table directory entry */ 158 } __packed dentry; 159 } __packed; 160 161 #define EXFAT_TZ_VALID (1 << 7) 162 163 /* Jan 1 GMT 00:00:00 1980 */ 164 #define EXFAT_MIN_TIMESTAMP_SECS 315532800LL 165 /* Dec 31 GMT 23:59:59 2107 */ 166 #define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL 167 168 #endif /* !_EXFAT_RAW_H */ 169