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Diffstat (limited to 'include/exfat_ondisk.h')
| -rw-r--r-- | include/exfat_ondisk.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/include/exfat_ondisk.h b/include/exfat_ondisk.h new file mode 100644 index 0000000..42cdadf --- /dev/null +++ b/include/exfat_ondisk.h @@ -0,0 +1,234 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2019 Namjae Jeon <linkinjeon@kernel.org> + */ + +#ifndef _EXFAT_H +#define _EXFAT_H + +#include <stdint.h> +#include <linux/fs.h> + +#ifdef HAVE_CONFIG_H +#include <config.h> +#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 +#define MAX_NAME_DENTRIES 17 + +/* 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 VOLUME_GUID_LEN 16 +#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 */ + struct { + __u8 num_ext; + __le16 checksum; + __u16 flags; + __u8 guid[VOLUME_GUID_LEN]; + __u8 reserved[10]; + } __attribute__((packed)) guid; /* volume GUID 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 */ |