exfat_raw.h 4.3 KB

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  1. /* SPDX-License-Identifier: GPL-2.0-or-later */
  2. /*
  3. * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
  4. */
  5. #ifndef _EXFAT_RAW_H
  6. #define _EXFAT_RAW_H
  7. #include <linux/types.h>
  8. #define BOOT_SIGNATURE 0xAA55
  9. #define EXBOOT_SIGNATURE 0xAA550000
  10. #define STR_EXFAT "EXFAT " /* size should be 8 */
  11. #define EXFAT_MAX_FILE_LEN 255
  12. #define VOLUME_DIRTY 0x0002
  13. #define MEDIA_FAILURE 0x0004
  14. #define EXFAT_EOF_CLUSTER 0xFFFFFFFFu
  15. #define EXFAT_BAD_CLUSTER 0xFFFFFFF7u
  16. #define EXFAT_FREE_CLUSTER 0
  17. /* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */
  18. #define EXFAT_RESERVED_CLUSTERS 2
  19. #define EXFAT_FIRST_CLUSTER 2
  20. #define EXFAT_DATA_CLUSTER_COUNT(sbi) \
  21. ((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)
  22. /* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */
  23. #define ALLOC_FAT_CHAIN 0x01
  24. #define ALLOC_NO_FAT_CHAIN 0x03
  25. #define DENTRY_SIZE 32 /* directory entry size */
  26. #define DENTRY_SIZE_BITS 5
  27. /* exFAT allows 8388608(256MB) directory entries */
  28. #define MAX_EXFAT_DENTRIES 8388608
  29. /* dentry types */
  30. #define EXFAT_UNUSED 0x00 /* end of directory */
  31. #define EXFAT_DELETE (~0x80)
  32. #define IS_EXFAT_DELETED(x) ((x) < 0x80) /* deleted file (0x01~0x7F) */
  33. #define EXFAT_INVAL 0x80 /* invalid value */
  34. #define EXFAT_BITMAP 0x81 /* allocation bitmap */
  35. #define EXFAT_UPCASE 0x82 /* upcase table */
  36. #define EXFAT_VOLUME 0x83 /* volume label */
  37. #define EXFAT_FILE 0x85 /* file or dir */
  38. #define EXFAT_GUID 0xA0
  39. #define EXFAT_PADDING 0xA1
  40. #define EXFAT_ACLTAB 0xA2
  41. #define EXFAT_STREAM 0xC0 /* stream entry */
  42. #define EXFAT_NAME 0xC1 /* file name entry */
  43. #define EXFAT_ACL 0xC2 /* stream entry */
  44. #define IS_EXFAT_CRITICAL_PRI(x) (x < 0xA0)
  45. #define IS_EXFAT_BENIGN_PRI(x) (x < 0xC0)
  46. #define IS_EXFAT_CRITICAL_SEC(x) (x < 0xE0)
  47. /* checksum types */
  48. #define CS_DIR_ENTRY 0
  49. #define CS_BOOT_SECTOR 1
  50. #define CS_DEFAULT 2
  51. /* file attributes */
  52. #define ATTR_READONLY 0x0001
  53. #define ATTR_HIDDEN 0x0002
  54. #define ATTR_SYSTEM 0x0004
  55. #define ATTR_VOLUME 0x0008
  56. #define ATTR_SUBDIR 0x0010
  57. #define ATTR_ARCHIVE 0x0020
  58. #define ATTR_RWMASK (ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \
  59. ATTR_SUBDIR | ATTR_ARCHIVE)
  60. #define BOOTSEC_JUMP_BOOT_LEN 3
  61. #define BOOTSEC_FS_NAME_LEN 8
  62. #define BOOTSEC_OLDBPB_LEN 53
  63. #define EXFAT_FILE_NAME_LEN 15
  64. #define EXFAT_MIN_SECT_SIZE_BITS 9
  65. #define EXFAT_MAX_SECT_SIZE_BITS 12
  66. #define EXFAT_MAX_SECT_PER_CLUS_BITS(x) (25 - (x)->sect_size_bits)
  67. /* EXFAT: Main and Backup Boot Sector (512 bytes) */
  68. struct boot_sector {
  69. __u8 jmp_boot[BOOTSEC_JUMP_BOOT_LEN];
  70. __u8 fs_name[BOOTSEC_FS_NAME_LEN];
  71. __u8 must_be_zero[BOOTSEC_OLDBPB_LEN];
  72. __le64 partition_offset;
  73. __le64 vol_length;
  74. __le32 fat_offset;
  75. __le32 fat_length;
  76. __le32 clu_offset;
  77. __le32 clu_count;
  78. __le32 root_cluster;
  79. __le32 vol_serial;
  80. __u8 fs_revision[2];
  81. __le16 vol_flags;
  82. __u8 sect_size_bits;
  83. __u8 sect_per_clus_bits;
  84. __u8 num_fats;
  85. __u8 drv_sel;
  86. __u8 percent_in_use;
  87. __u8 reserved[7];
  88. __u8 boot_code[390];
  89. __le16 signature;
  90. } __packed;
  91. struct exfat_dentry {
  92. __u8 type;
  93. union {
  94. struct {
  95. __u8 num_ext;
  96. __le16 checksum;
  97. __le16 attr;
  98. __le16 reserved1;
  99. __le16 create_time;
  100. __le16 create_date;
  101. __le16 modify_time;
  102. __le16 modify_date;
  103. __le16 access_time;
  104. __le16 access_date;
  105. __u8 create_time_cs;
  106. __u8 modify_time_cs;
  107. __u8 create_tz;
  108. __u8 modify_tz;
  109. __u8 access_tz;
  110. __u8 reserved2[7];
  111. } __packed file; /* file directory entry */
  112. struct {
  113. __u8 flags;
  114. __u8 reserved1;
  115. __u8 name_len;
  116. __le16 name_hash;
  117. __le16 reserved2;
  118. __le64 valid_size;
  119. __le32 reserved3;
  120. __le32 start_clu;
  121. __le64 size;
  122. } __packed stream; /* stream extension directory entry */
  123. struct {
  124. __u8 flags;
  125. __le16 unicode_0_14[EXFAT_FILE_NAME_LEN];
  126. } __packed name; /* file name directory entry */
  127. struct {
  128. __u8 flags;
  129. __u8 reserved[18];
  130. __le32 start_clu;
  131. __le64 size;
  132. } __packed bitmap; /* allocation bitmap directory entry */
  133. struct {
  134. __u8 reserved1[3];
  135. __le32 checksum;
  136. __u8 reserved2[12];
  137. __le32 start_clu;
  138. __le64 size;
  139. } __packed upcase; /* up-case table directory entry */
  140. } __packed dentry;
  141. } __packed;
  142. #define EXFAT_TZ_VALID (1 << 7)
  143. /* Jan 1 GMT 00:00:00 1980 */
  144. #define EXFAT_MIN_TIMESTAMP_SECS 315532800LL
  145. /* Dec 31 GMT 23:59:59 2107 */
  146. #define EXFAT_MAX_TIMESTAMP_SECS 4354819199LL
  147. #endif /* !_EXFAT_RAW_H */