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_POSSIBLE		0x01
31 #define ALLOC_FAT_CHAIN		0x01
32 #define ALLOC_NO_FAT_CHAIN	0x03
33 
34 #define DENTRY_SIZE		32 /* directory entry size */
35 #define DENTRY_SIZE_BITS	5
36 /* exFAT allows 8388608(256MB) directory entries */
37 #define MAX_EXFAT_DENTRIES	8388608
38 
39 /* dentry types */
40 #define EXFAT_UNUSED		0x00	/* end of directory */
41 #define EXFAT_DELETE		(~0x80)
42 #define IS_EXFAT_DELETED(x)	((x) < 0x80) /* deleted file (0x01~0x7F) */
43 #define EXFAT_INVAL		0x80	/* invalid value */
44 #define EXFAT_BITMAP		0x81	/* allocation bitmap */
45 #define EXFAT_UPCASE		0x82	/* upcase table */
46 #define EXFAT_VOLUME		0x83	/* volume label */
47 #define EXFAT_FILE		0x85	/* file or dir */
48 #define EXFAT_GUID		0xA0
49 #define EXFAT_PADDING		0xA1
50 #define EXFAT_ACLTAB		0xA2
51 #define EXFAT_STREAM		0xC0	/* stream entry */
52 #define EXFAT_NAME		0xC1	/* file name entry */
53 #define EXFAT_ACL		0xC2	/* stream entry */
54 #define EXFAT_VENDOR_EXT	0xE0	/* vendor extension entry */
55 #define EXFAT_VENDOR_ALLOC	0xE1	/* vendor allocation entry */
56 
57 #define IS_EXFAT_CRITICAL_PRI(x)	(x < 0xA0)
58 #define IS_EXFAT_BENIGN_PRI(x)		(x < 0xC0)
59 #define IS_EXFAT_CRITICAL_SEC(x)	(x < 0xE0)
60 
61 /* checksum types */
62 #define CS_DIR_ENTRY		0
63 #define CS_BOOT_SECTOR		1
64 #define CS_DEFAULT		2
65 
66 /* file attributes */
67 #define ATTR_READONLY		0x0001
68 #define ATTR_HIDDEN		0x0002
69 #define ATTR_SYSTEM		0x0004
70 #define ATTR_VOLUME		0x0008
71 #define ATTR_SUBDIR		0x0010
72 #define ATTR_ARCHIVE		0x0020
73 
74 #define ATTR_RWMASK		(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
75 				 ATTR_SUBDIR | ATTR_ARCHIVE)
76 
77 #define BOOTSEC_JUMP_BOOT_LEN		3
78 #define BOOTSEC_FS_NAME_LEN		8
79 #define BOOTSEC_OLDBPB_LEN		53
80 
81 #define EXFAT_FILE_NAME_LEN		15
82 
83 #define EXFAT_MIN_SECT_SIZE_BITS		9
84 #define EXFAT_MAX_SECT_SIZE_BITS		12
85 #define EXFAT_MAX_SECT_PER_CLUS_BITS(x)		(25 - (x)->sect_size_bits)
86 
87 /* EXFAT: Main and Backup Boot Sector (512 bytes) */
88 struct boot_sector {
89 	__u8	jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
90 	__u8	fs_name[BOOTSEC_FS_NAME_LEN];
91 	__u8	must_be_zero[BOOTSEC_OLDBPB_LEN];
92 	__le64	partition_offset;
93 	__le64	vol_length;
94 	__le32	fat_offset;
95 	__le32	fat_length;
96 	__le32	clu_offset;
97 	__le32	clu_count;
98 	__le32	root_cluster;
99 	__le32	vol_serial;
100 	__u8	fs_revision[2];
101 	__le16	vol_flags;
102 	__u8	sect_size_bits;
103 	__u8	sect_per_clus_bits;
104 	__u8	num_fats;
105 	__u8	drv_sel;
106 	__u8	percent_in_use;
107 	__u8	reserved[7];
108 	__u8	boot_code[390];
109 	__le16	signature;
110 } __packed;
111 
112 struct exfat_dentry {
113 	__u8 type;
114 	union {
115 		struct {
116 			__u8 num_ext;
117 			__le16 checksum;
118 			__le16 attr;
119 			__le16 reserved1;
120 			__le16 create_time;
121 			__le16 create_date;
122 			__le16 modify_time;
123 			__le16 modify_date;
124 			__le16 access_time;
125 			__le16 access_date;
126 			__u8 create_time_cs;
127 			__u8 modify_time_cs;
128 			__u8 create_tz;
129 			__u8 modify_tz;
130 			__u8 access_tz;
131 			__u8 reserved2[7];
132 		} __packed file; /* file directory entry */
133 		struct {
134 			__u8 flags;
135 			__u8 reserved1;
136 			__u8 name_len;
137 			__le16 name_hash;
138 			__le16 reserved2;
139 			__le64 valid_size;
140 			__le32 reserved3;
141 			__le32 start_clu;
142 			__le64 size;
143 		} __packed stream; /* stream extension directory entry */
144 		struct {
145 			__u8 flags;
146 			__le16 unicode_0_14[EXFAT_FILE_NAME_LEN];
147 		} __packed name; /* file name directory entry */
148 		struct {
149 			__u8 flags;
150 			__u8 reserved[18];
151 			__le32 start_clu;
152 			__le64 size;
153 		} __packed bitmap; /* allocation bitmap directory entry */
154 		struct {
155 			__u8 reserved1[3];
156 			__le32 checksum;
157 			__u8 reserved2[12];
158 			__le32 start_clu;
159 			__le64 size;
160 		} __packed upcase; /* up-case table directory entry */
161 		struct {
162 			__u8 flags;
163 			__u8 vendor_guid[16];
164 			__u8 vendor_defined[14];
165 		} __packed vendor_ext; /* vendor extension directory entry */
166 		struct {
167 			__u8 flags;
168 			__u8 vendor_guid[16];
169 			__u8 vendor_defined[2];
170 			__le32 start_clu;
171 			__le64 size;
172 		} __packed vendor_alloc; /* vendor allocation directory entry */
173 		struct {
174 			__u8 flags;
175 			__u8 custom_defined[18];
176 			__le32 start_clu;
177 			__le64 size;
178 		} __packed generic_secondary; /* generic secondary directory entry */
179 	} __packed dentry;
180 } __packed;
181 
182 #define EXFAT_TZ_VALID		(1 << 7)
183 
184 /* Jan 1 GMT 00:00:00 1980 */
185 #define EXFAT_MIN_TIMESTAMP_SECS    315532800LL
186 /* Dec 31 GMT 23:59:59 2107 */
187 #define EXFAT_MAX_TIMESTAMP_SECS    4354819199LL
188 
189 #endif /* !_EXFAT_RAW_H */
190