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authorNamjae Jeon <namjae.jeon@samsung.com>2020-03-02 07:21:32 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2020-03-06 03:00:39 +0100
commit1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 (patch)
treebe83dfe235f2fb630c4cef9e98445bba822bfd37 /fs/exfat/exfat_raw.h
parentLinux 5.6-rc1 (diff)
downloadlinux-1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003.tar.xz
linux-1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003.zip
exfat: add in-memory and on-disk structures and headers
This adds in-memory and on-disk structures and headers. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com> Reviewed-by: Pali Rohár <pali.rohar@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/exfat/exfat_raw.h')
-rw-r--r--fs/exfat/exfat_raw.h184
1 files changed, 184 insertions, 0 deletions
diff --git a/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
new file mode 100644
index 000000000000..2a841010e649
--- /dev/null
+++ b/fs/exfat/exfat_raw.h
@@ -0,0 +1,184 @@
+/* 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 PBR_SIGNATURE 0xAA55
+
+#define EXFAT_MAX_FILE_LEN 255
+
+#define VOL_CLEAN 0x0000
+#define VOL_DIRTY 0x0002
+
+#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_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_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
+ ATTR_SUBDIR | ATTR_ARCHIVE)
+
+#define PBR64_JUMP_BOOT_LEN 3
+#define PBR64_OEM_NAME_LEN 8
+#define PBR64_RESERVED_LEN 53
+
+#define EXFAT_FILE_NAME_LEN 15
+
+/* EXFAT BIOS parameter block (64 bytes) */
+struct bpb64 {
+ __u8 jmp_boot[PBR64_JUMP_BOOT_LEN];
+ __u8 oem_name[PBR64_OEM_NAME_LEN];
+ __u8 res_zero[PBR64_RESERVED_LEN];
+} __packed;
+
+/* 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];
+} __packed;
+
+/* EXFAT PBR[BPB+BSX] (120 bytes) */
+struct pbr64 {
+ struct bpb64 bpb;
+ struct bsx64 bsx;
+} __packed;
+
+/* Common PBR[Partition Boot Record] (512 bytes) */
+struct pbr {
+ union {
+ __u8 raw[64];
+ struct bpb64 f64;
+ } bpb;
+ union {
+ __u8 raw[56];
+ struct bsx64 f64;
+ } bsx;
+ __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_ms;
+ __u8 modify_time_ms;
+ __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 */