mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 13:05:10 +07:00
33404a1598
Separate the boot sector analysis to read_boot_sector(). And add a check for the fs_name field. Furthermore, add a strict consistency check, because overlapping areas can cause serious corruption. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
166 lines
4.2 KiB
C
166 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
|
|
*/
|
|
|
|
#ifndef _EXFAT_RAW_H
|
|
#define _EXFAT_RAW_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#define BOOT_SIGNATURE 0xAA55
|
|
#define EXBOOT_SIGNATURE 0xAA550000
|
|
#define STR_EXFAT "EXFAT " /* size should be 8 */
|
|
|
|
#define EXFAT_MAX_FILE_LEN 255
|
|
|
|
#define VOL_CLEAN 0x0000
|
|
#define VOL_DIRTY 0x0002
|
|
#define ERR_MEDIUM 0x0004
|
|
|
|
#define EXFAT_EOF_CLUSTER 0xFFFFFFFFu
|
|
#define EXFAT_BAD_CLUSTER 0xFFFFFFF7u
|
|
#define EXFAT_FREE_CLUSTER 0
|
|
/* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */
|
|
#define EXFAT_RESERVED_CLUSTERS 2
|
|
#define EXFAT_FIRST_CLUSTER 2
|
|
#define EXFAT_DATA_CLUSTER_COUNT(sbi) \
|
|
((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)
|
|
|
|
/* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */
|
|
#define ALLOC_FAT_CHAIN 0x01
|
|
#define ALLOC_NO_FAT_CHAIN 0x03
|
|
|
|
#define DENTRY_SIZE 32 /* directory entry size */
|
|
#define DENTRY_SIZE_BITS 5
|
|
/* exFAT allows 8388608(256MB) directory entries */
|
|
#define MAX_EXFAT_DENTRIES 8388608
|
|
|
|
/* dentry types */
|
|
#define EXFAT_UNUSED 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 */
|
|
|
|
#define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0)
|
|
#define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0)
|
|
#define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0)
|
|
|
|
/* checksum types */
|
|
#define CS_DIR_ENTRY 0
|
|
#define CS_BOOT_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_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
|
|
ATTR_SUBDIR | ATTR_ARCHIVE)
|
|
|
|
#define BOOTSEC_JUMP_BOOT_LEN 3
|
|
#define BOOTSEC_FS_NAME_LEN 8
|
|
#define BOOTSEC_OLDBPB_LEN 53
|
|
|
|
#define EXFAT_FILE_NAME_LEN 15
|
|
|
|
/* EXFAT: Main and Backup Boot Sector (512 bytes) */
|
|
struct boot_sector {
|
|
__u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
|
|
__u8 fs_name[BOOTSEC_FS_NAME_LEN];
|
|
__u8 must_be_zero[BOOTSEC_OLDBPB_LEN];
|
|
__le64 partition_offset;
|
|
__le64 vol_length;
|
|
__le32 fat_offset;
|
|
__le32 fat_length;
|
|
__le32 clu_offset;
|
|
__le32 clu_count;
|
|
__le32 root_cluster;
|
|
__le32 vol_serial;
|
|
__u8 fs_revision[2];
|
|
__le16 vol_flags;
|
|
__u8 sect_size_bits;
|
|
__u8 sect_per_clus_bits;
|
|
__u8 num_fats;
|
|
__u8 drv_sel;
|
|
__u8 percent_in_use;
|
|
__u8 reserved[7];
|
|
__u8 boot_code[390];
|
|
__le16 signature;
|
|
} __packed;
|
|
|
|
struct exfat_dentry {
|
|
__u8 type;
|
|
union {
|
|
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_cs;
|
|
__u8 modify_time_cs;
|
|
__u8 create_tz;
|
|
__u8 modify_tz;
|
|
__u8 access_tz;
|
|
__u8 reserved2[7];
|
|
} __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;
|
|
} __packed stream; /* stream extension directory entry */
|
|
struct {
|
|
__u8 flags;
|
|
__le16 unicode_0_14[EXFAT_FILE_NAME_LEN];
|
|
} __packed name; /* file name directory entry */
|
|
struct {
|
|
__u8 flags;
|
|
__u8 reserved[18];
|
|
__le32 start_clu;
|
|
__le64 size;
|
|
} __packed bitmap; /* allocation bitmap directory entry */
|
|
struct {
|
|
__u8 reserved1[3];
|
|
__le32 checksum;
|
|
__u8 reserved2[12];
|
|
__le32 start_clu;
|
|
__le64 size;
|
|
} __packed upcase; /* up-case table directory entry */
|
|
} __packed dentry;
|
|
} __packed;
|
|
|
|
#define EXFAT_TZ_VALID (1 << 7)
|
|
|
|
/* Jan 1 GMT 00:00:00 1980 */
|
|
#define EXFAT_MIN_TIMESTAMP_SECS 315532800LL
|
|
/* Dec 31 GMT 23:59:59 2107 */
|
|
#define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL
|
|
|
|
#endif /* !_EXFAT_RAW_H */
|