1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> 4 */ 5 6 #ifndef _EXFAT_H 7 #define _EXFAT_H 8 9 #include <stdint.h> 10 #include <linux/fs.h> 11 12 #ifdef HAVE_CONFIG_H 13 #include <config.h> 14 #endif 15 16 #ifdef WORDS_BIGENDIAN 17 #define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) 18 #define cpu_to_le32(x) \ 19 ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ 20 (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) 21 #define cpu_to_le64(x) (cpu_to_le32((uint64_t)(x)) << 32 | \ 22 cpu_to_le32((uint64_t)(x) >> 32)) 23 #else 24 #define cpu_to_le16(x) (x) 25 #define cpu_to_le32(x) (x) 26 #define cpu_to_le64(x) (x) 27 #endif 28 29 #define le64_to_cpu(x) ((uint64_t)cpu_to_le64(x)) 30 #define le32_to_cpu(x) ((uint32_t)cpu_to_le32(x)) 31 #define le16_to_cpu(x) ((uint16_t)cpu_to_le16(x)) 32 33 #define PBR_SIGNATURE 0xAA55 34 35 #define VOL_CLEAN 0x0000 36 #define VOL_DIRTY 0x0002 37 38 #define DENTRY_SIZE 32 /* directory entry size */ 39 #define DENTRY_SIZE_BITS 5 40 /* exFAT allows 8388608(256MB) directory entries */ 41 #define MAX_EXFAT_DENTRIES 8388608 42 43 /* dentry types */ 44 #define MSDOS_DELETED 0xE5 /* deleted mark */ 45 #define MSDOS_UNUSED 0x00 /* end of directory */ 46 47 #define EXFAT_LAST 0x00 /* end of directory */ 48 #define EXFAT_DELETE ~(0x80) 49 #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ 50 #define EXFAT_INVAL 0x80 /* invalid value */ 51 #define EXFAT_BITMAP 0x81 /* allocation bitmap */ 52 #define EXFAT_UPCASE 0x82 /* upcase table */ 53 #define EXFAT_VOLUME 0x83 /* volume label */ 54 #define EXFAT_FILE 0x85 /* file or dir */ 55 #define EXFAT_GUID 0xA0 56 #define EXFAT_PADDING 0xA1 57 #define EXFAT_ACLTAB 0xA2 58 #define EXFAT_STREAM 0xC0 /* stream entry */ 59 #define EXFAT_NAME 0xC1 /* file name entry */ 60 #define EXFAT_ACL 0xC2 /* stream entry */ 61 62 /* checksum types */ 63 #define CS_DIR_ENTRY 0 64 #define CS_PBR_SECTOR 1 65 #define CS_DEFAULT 2 66 67 /* file attributes */ 68 #define ATTR_READONLY 0x0001 69 #define ATTR_HIDDEN 0x0002 70 #define ATTR_SYSTEM 0x0004 71 #define ATTR_VOLUME 0x0008 72 #define ATTR_SUBDIR 0x0010 73 #define ATTR_ARCHIVE 0x0020 74 #define ATTR_EXTEND (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | \ 75 ATTR_VOLUME) /* 0x000F */ 76 77 #define ATTR_EXTEND_MASK (ATTR_EXTEND | ATTR_SUBDIR | ATTR_ARCHIVE) 78 #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ 79 ATTR_SUBDIR | ATTR_ARCHIVE) 80 81 #define ATTR_READONLY_LE cpu_to_le16(0x0001) 82 #define ATTR_HIDDEN_LE cpu_to_le16(0x0002) 83 #define ATTR_SYSTEM_LE cpu_to_le16(0x0004) 84 #define ATTR_VOLUME_LE cpu_to_le16(0x0008) 85 #define ATTR_SUBDIR_LE cpu_to_le16(0x0010) 86 #define ATTR_ARCHIVE_LE cpu_to_le16(0x0020) 87 88 /* stream flags */ 89 #define EXFAT_SF_CONTIGUOUS 0x02 90 91 #define CLUSTER_32(x) ((unsigned int)((x) & 0xFFFFFFFFU)) 92 #define EXFAT_EOF_CLUSTER CLUSTER_32(~0) 93 #define EXFAT_BAD_CLUSTER (0xFFFFFFF7U) 94 #define EXFAT_FREE_CLUSTER (0) 95 #define EXFAT_FIRST_CLUSTER (2) 96 #define EXFAT_RESERVED_CLUSTERS (2) 97 98 99 /* EXFAT BIOS parameter block (64 bytes) */ 100 struct bpb64 { 101 __u8 jmp_boot[3]; 102 __u8 oem_name[8]; 103 __u8 res_zero[53]; 104 }; 105 106 /* EXFAT EXTEND BIOS parameter block (56 bytes) */ 107 struct bsx64 { 108 __le64 vol_offset; 109 __le64 vol_length; 110 __le32 fat_offset; 111 __le32 fat_length; 112 __le32 clu_offset; 113 __le32 clu_count; 114 __le32 root_cluster; 115 __le32 vol_serial; 116 __u8 fs_version[2]; 117 __le16 vol_flags; 118 __u8 sect_size_bits; 119 __u8 sect_per_clus_bits; 120 __u8 num_fats; 121 __u8 phy_drv_no; 122 __u8 perc_in_use; 123 __u8 reserved2[7]; 124 }; 125 126 /* Common PBR[Partition Boot Record] (512 bytes) */ 127 struct pbr { 128 struct bpb64 bpb; 129 struct bsx64 bsx; 130 __u8 boot_code[390]; 131 __le16 signature; 132 }; 133 134 #define VOLUME_LABEL_MAX_LEN 11 135 #define ENTRY_NAME_MAX 15 136 137 struct exfat_dentry { 138 __u8 type; 139 union { 140 struct { 141 __u8 character_count; 142 __le16 volume_label[VOLUME_LABEL_MAX_LEN]; 143 __u8 reserved[8]; 144 } __attribute__((packed)) vol; /* file directory entry */ 145 146 struct { 147 __u8 num_ext; 148 __le16 checksum; 149 __le16 attr; 150 __le16 reserved1; 151 __le16 create_time; 152 __le16 create_date; 153 __le16 modify_time; 154 __le16 modify_date; 155 __le16 access_time; 156 __le16 access_date; 157 __u8 create_time_ms; 158 __u8 modify_time_ms; 159 __u8 access_time_ms; 160 __u8 reserved2[9]; 161 } __attribute__((packed)) file; /* file directory entry */ 162 struct { 163 __u8 flags; 164 __u8 reserved1; 165 __u8 name_len; 166 __le16 name_hash; 167 __le16 reserved2; 168 __le64 valid_size; 169 __le32 reserved3; 170 __le32 start_clu; 171 __le64 size; 172 } __attribute__((packed)) stream; /* stream extension directory entry */ 173 struct { 174 __u8 flags; 175 __le16 unicode_0_14[15]; 176 } __attribute__((packed)) name; /* file name directory entry */ 177 struct { 178 __u8 flags; 179 __u8 reserved[18]; 180 __le32 start_clu; 181 __le64 size; 182 } __attribute__((packed)) bitmap; /* allocation bitmap directory entry */ 183 struct { 184 __u8 reserved1[3]; 185 __le32 checksum; 186 __u8 reserved2[12]; 187 __le32 start_clu; 188 __le64 size; 189 } __attribute__((packed)) upcase; /* up-case table directory entry */ 190 } __attribute__((packed)) dentry; 191 } __attribute__((packed)); 192 193 #define vol_char_cnt dentry.vol.character_count 194 #define vol_label dentry.vol.volume_label 195 #define file_num_ext dentry.file.num_ext 196 #define file_checksum dentry.file.checksum 197 #define file_attr dentry.file.attr 198 #define file_create_time dentry.file.create_time 199 #define file_create_date dentry.file.create_date 200 #define file_modify_time dentry.file.modify_time 201 #define file_modify_date dentry.file.modify_date 202 #define file_access_time dentry.file.access_time 203 #define file_access_date dentry.file.access_date 204 #define file_create_time_ms dentry.file.create_time_ms 205 #define file_modify_time_ms dentry.file.modify_time_ms 206 #define file_access_time_ms dentry.file.access_time_ms 207 #define stream_flags dentry.stream.flags 208 #define stream_name_len dentry.stream.name_len 209 #define stream_name_hash dentry.stream.name_hash 210 #define stream_start_clu dentry.stream.start_clu 211 #define stream_valid_size dentry.stream.valid_size 212 #define stream_size dentry.stream.size 213 #define name_flags dentry.name.flags 214 #define name_unicode dentry.name.unicode_0_14 215 #define bitmap_flags dentry.bitmap.flags 216 #define bitmap_start_clu dentry.bitmap.start_clu 217 #define bitmap_size dentry.bitmap.size 218 #define upcase_start_clu dentry.upcase.start_clu 219 #define upcase_size dentry.upcase.size 220 #define upcase_checksum dentry.upcase.checksum 221 222 #endif /* !_EXFAT_H */ 223