/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2019 Namjae Jeon */ #ifndef _EXFAT_H #define _EXFAT_H #include #include #ifdef HAVE_CONFIG_H #include #endif #ifdef WORDS_BIGENDIAN #define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)) #define cpu_to_le32(x) \ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \ (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24)) #define cpu_to_le64(x) (cpu_to_le32((uint64_t)(x)) << 32 | \ cpu_to_le32((uint64_t)(x) >> 32)) #else #define cpu_to_le16(x) (x) #define cpu_to_le32(x) (x) #define cpu_to_le64(x) (x) #endif #define le64_to_cpu(x) ((uint64_t)cpu_to_le64(x)) #define le32_to_cpu(x) ((uint32_t)cpu_to_le32(x)) #define le16_to_cpu(x) ((uint16_t)cpu_to_le16(x)) #define PBR_SIGNATURE 0xAA55 #define VOL_CLEAN 0x0000 #define VOL_DIRTY 0x0002 #define DENTRY_SIZE 32 /* directory entry size */ #define DENTRY_SIZE_BITS 5 /* exFAT allows 8388608(256MB) directory entries */ #define MAX_EXFAT_DENTRIES 8388608 #define MIN_FILE_DENTRIES 3 /* dentry types */ #define MSDOS_DELETED 0xE5 /* deleted mark */ #define MSDOS_UNUSED 0x00 /* end of directory */ #define EXFAT_LAST 0x00 /* end of directory */ #define EXFAT_DELETE ~(0x80) #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */ #define EXFAT_INVAL 0x80 /* invalid value */ #define EXFAT_BITMAP 0x81 /* allocation bitmap */ #define EXFAT_UPCASE 0x82 /* upcase table */ #define EXFAT_VOLUME 0x83 /* volume label */ #define EXFAT_FILE 0x85 /* file or dir */ #define EXFAT_GUID 0xA0 #define EXFAT_PADDING 0xA1 #define EXFAT_ACLTAB 0xA2 #define EXFAT_STREAM 0xC0 /* stream entry */ #define EXFAT_NAME 0xC1 /* file name entry */ #define EXFAT_ACL 0xC2 /* stream entry */ /* checksum types */ #define CS_DIR_ENTRY 0 #define CS_PBR_SECTOR 1 #define CS_DEFAULT 2 /* file attributes */ #define ATTR_READONLY 0x0001 #define ATTR_HIDDEN 0x0002 #define ATTR_SYSTEM 0x0004 #define ATTR_VOLUME 0x0008 #define ATTR_SUBDIR 0x0010 #define ATTR_ARCHIVE 0x0020 #define ATTR_EXTEND (ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM | \ ATTR_VOLUME) /* 0x000F */ #define ATTR_EXTEND_MASK (ATTR_EXTEND | ATTR_SUBDIR | ATTR_ARCHIVE) #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \ ATTR_SUBDIR | ATTR_ARCHIVE) #define ATTR_READONLY_LE cpu_to_le16(0x0001) #define ATTR_HIDDEN_LE cpu_to_le16(0x0002) #define ATTR_SYSTEM_LE cpu_to_le16(0x0004) #define ATTR_VOLUME_LE cpu_to_le16(0x0008) #define ATTR_SUBDIR_LE cpu_to_le16(0x0010) #define ATTR_ARCHIVE_LE cpu_to_le16(0x0020) /* stream flags */ #define EXFAT_SF_CONTIGUOUS 0x02 #define CLUSTER_32(x) ((unsigned int)((x) & 0xFFFFFFFFU)) #define EXFAT_EOF_CLUSTER CLUSTER_32(~0) #define EXFAT_BAD_CLUSTER (0xFFFFFFF7U) #define EXFAT_FREE_CLUSTER (0) #define EXFAT_FIRST_CLUSTER (2) #define EXFAT_RESERVED_CLUSTERS (2) /* EXFAT BIOS parameter block (64 bytes) */ struct bpb64 { __u8 jmp_boot[3]; __u8 oem_name[8]; __u8 res_zero[53]; }; /* EXFAT EXTEND BIOS parameter block (56 bytes) */ struct bsx64 { __le64 vol_offset; __le64 vol_length; __le32 fat_offset; __le32 fat_length; __le32 clu_offset; __le32 clu_count; __le32 root_cluster; __le32 vol_serial; __u8 fs_version[2]; __le16 vol_flags; __u8 sect_size_bits; __u8 sect_per_clus_bits; __u8 num_fats; __u8 phy_drv_no; __u8 perc_in_use; __u8 reserved2[7]; }; /* Common PBR[Partition Boot Record] (512 bytes) */ struct pbr { struct bpb64 bpb; struct bsx64 bsx; __u8 boot_code[390]; __le16 signature; }; #define VOLUME_LABEL_MAX_LEN 11 #define ENTRY_NAME_MAX 15 struct exfat_dentry { __u8 type; union { struct { __u8 character_count; __le16 volume_label[VOLUME_LABEL_MAX_LEN]; __u8 reserved[8]; } __attribute__((packed)) vol; /* file directory entry */ struct { __u8 num_ext; __le16 checksum; __le16 attr; __le16 reserved1; __le16 create_time; __le16 create_date; __le16 modify_time; __le16 modify_date; __le16 access_time; __le16 access_date; __u8 create_time_ms; __u8 modify_time_ms; __u8 create_tz; __u8 modify_tz; __u8 access_tz; __u8 reserved2[7]; } __attribute__((packed)) file; /* file directory entry */ struct { __u8 flags; __u8 reserved1; __u8 name_len; __le16 name_hash; __le16 reserved2; __le64 valid_size; __le32 reserved3; __le32 start_clu; __le64 size; } __attribute__((packed)) stream; /* stream extension directory entry */ struct { __u8 flags; __le16 unicode_0_14[15]; } __attribute__((packed)) name; /* file name directory entry */ struct { __u8 flags; __u8 reserved[18]; __le32 start_clu; __le64 size; } __attribute__((packed)) bitmap; /* allocation bitmap directory entry */ struct { __u8 reserved1[3]; __le32 checksum; __u8 reserved2[12]; __le32 start_clu; __le64 size; } __attribute__((packed)) upcase; /* up-case table directory entry */ } __attribute__((packed)) dentry; } __attribute__((packed)); #define vol_char_cnt dentry.vol.character_count #define vol_label dentry.vol.volume_label #define file_num_ext dentry.file.num_ext #define file_checksum dentry.file.checksum #define file_attr dentry.file.attr #define file_create_time dentry.file.create_time #define file_create_date dentry.file.create_date #define file_modify_time dentry.file.modify_time #define file_modify_date dentry.file.modify_date #define file_access_time dentry.file.access_time #define file_access_date dentry.file.access_date #define file_create_time_ms dentry.file.create_time_ms #define file_modify_time_ms dentry.file.modify_time_ms #define file_access_time_ms dentry.file.access_time_ms #define stream_flags dentry.stream.flags #define stream_name_len dentry.stream.name_len #define stream_name_hash dentry.stream.name_hash #define stream_start_clu dentry.stream.start_clu #define stream_valid_size dentry.stream.valid_size #define stream_size dentry.stream.size #define name_flags dentry.name.flags #define name_unicode dentry.name.unicode_0_14 #define bitmap_flags dentry.bitmap.flags #define bitmap_start_clu dentry.bitmap.start_clu #define bitmap_size dentry.bitmap.size #define upcase_start_clu dentry.upcase.start_clu #define upcase_size dentry.upcase.size #define upcase_checksum dentry.upcase.checksum #endif /* !_EXFAT_H */