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MediaFailure and VolumeDirty should be retained if these are set before mounting. In '3.1.13.3 Media Failure Field' of exfat specification describe: If, upon mounting a volume, the value of this field is 1, implementations which scan the entire volume for media failures and record all failures as "bad" clusters in the FAT (or otherwise resolve media failures) may clear the value of this field to 0. Therefore, We should not clear MediaFailure without scanning volume. In '8.1 Recommended Write Ordering' of exfat specification describe: Clear the value of the VolumeDirty field to 0, if its value prior to the first step was 0. Therefore, We should not clear VolumeDirty after mounting. Also rename ERR_MEDIUM to MEDIA_FAILURE. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*/
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#ifndef _EXFAT_RAW_H
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#define _EXFAT_RAW_H
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#include <linux/types.h>
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#define BOOT_SIGNATURE 0xAA55
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#define EXBOOT_SIGNATURE 0xAA550000
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#define STR_EXFAT "EXFAT " /* size should be 8 */
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#define EXFAT_MAX_FILE_LEN 255
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#define VOLUME_DIRTY 0x0002
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#define MEDIA_FAILURE 0x0004
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#define EXFAT_EOF_CLUSTER 0xFFFFFFFFu
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#define EXFAT_BAD_CLUSTER 0xFFFFFFF7u
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#define EXFAT_FREE_CLUSTER 0
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/* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */
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#define EXFAT_RESERVED_CLUSTERS 2
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#define EXFAT_FIRST_CLUSTER 2
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#define EXFAT_DATA_CLUSTER_COUNT(sbi) \
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((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)
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/* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */
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#define ALLOC_FAT_CHAIN 0x01
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#define ALLOC_NO_FAT_CHAIN 0x03
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#define DENTRY_SIZE 32 /* directory entry size */
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#define DENTRY_SIZE_BITS 5
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/* exFAT allows 8388608(256MB) directory entries */
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#define MAX_EXFAT_DENTRIES 8388608
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/* dentry types */
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#define EXFAT_UNUSED 0x00 /* end of directory */
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#define EXFAT_DELETE (~0x80)
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#define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */
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#define EXFAT_INVAL 0x80 /* invalid value */
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#define EXFAT_BITMAP 0x81 /* allocation bitmap */
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#define EXFAT_UPCASE 0x82 /* upcase table */
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#define EXFAT_VOLUME 0x83 /* volume label */
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#define EXFAT_FILE 0x85 /* file or dir */
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#define EXFAT_GUID 0xA0
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#define EXFAT_PADDING 0xA1
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#define EXFAT_ACLTAB 0xA2
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#define EXFAT_STREAM 0xC0 /* stream entry */
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#define EXFAT_NAME 0xC1 /* file name entry */
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#define EXFAT_ACL 0xC2 /* stream entry */
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#define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0)
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#define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0)
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#define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0)
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/* checksum types */
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#define CS_DIR_ENTRY 0
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#define CS_BOOT_SECTOR 1
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#define CS_DEFAULT 2
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/* file attributes */
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#define ATTR_READONLY 0x0001
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#define ATTR_HIDDEN 0x0002
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#define ATTR_SYSTEM 0x0004
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#define ATTR_VOLUME 0x0008
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#define ATTR_SUBDIR 0x0010
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#define ATTR_ARCHIVE 0x0020
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#define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
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ATTR_SUBDIR | ATTR_ARCHIVE)
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#define BOOTSEC_JUMP_BOOT_LEN 3
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#define BOOTSEC_FS_NAME_LEN 8
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#define BOOTSEC_OLDBPB_LEN 53
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#define EXFAT_FILE_NAME_LEN 15
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/* EXFAT: Main and Backup Boot Sector (512 bytes) */
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struct boot_sector {
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__u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
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__u8 fs_name[BOOTSEC_FS_NAME_LEN];
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__u8 must_be_zero[BOOTSEC_OLDBPB_LEN];
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__le64 partition_offset;
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__le64 vol_length;
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__le32 fat_offset;
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__le32 fat_length;
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__le32 clu_offset;
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__le32 clu_count;
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__le32 root_cluster;
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__le32 vol_serial;
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__u8 fs_revision[2];
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__le16 vol_flags;
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__u8 sect_size_bits;
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__u8 sect_per_clus_bits;
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__u8 num_fats;
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__u8 drv_sel;
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__u8 percent_in_use;
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__u8 reserved[7];
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__u8 boot_code[390];
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__le16 signature;
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} __packed;
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struct exfat_dentry {
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__u8 type;
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union {
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struct {
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__u8 num_ext;
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__le16 checksum;
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__le16 attr;
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__le16 reserved1;
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__le16 create_time;
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__le16 create_date;
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__le16 modify_time;
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__le16 modify_date;
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__le16 access_time;
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__le16 access_date;
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__u8 create_time_cs;
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__u8 modify_time_cs;
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__u8 create_tz;
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__u8 modify_tz;
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__u8 access_tz;
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__u8 reserved2[7];
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} __packed file; /* file directory entry */
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struct {
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__u8 flags;
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__u8 reserved1;
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__u8 name_len;
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__le16 name_hash;
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__le16 reserved2;
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__le64 valid_size;
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__le32 reserved3;
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__le32 start_clu;
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__le64 size;
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} __packed stream; /* stream extension directory entry */
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struct {
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__u8 flags;
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__le16 unicode_0_14[EXFAT_FILE_NAME_LEN];
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} __packed name; /* file name directory entry */
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struct {
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__u8 flags;
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__u8 reserved[18];
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__le32 start_clu;
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__le64 size;
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} __packed bitmap; /* allocation bitmap directory entry */
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struct {
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__u8 reserved1[3];
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__le32 checksum;
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__u8 reserved2[12];
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__le32 start_clu;
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__le64 size;
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} __packed upcase; /* up-case table directory entry */
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} __packed dentry;
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} __packed;
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#define EXFAT_TZ_VALID (1 << 7)
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/* Jan 1 GMT 00:00:00 1980 */
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#define EXFAT_MIN_TIMESTAMP_SECS 315532800LL
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/* Dec 31 GMT 23:59:59 2107 */
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#define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL
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#endif /* !_EXFAT_RAW_H */
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