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oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

msdos_fs.h (6731B)

    

  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. #ifndef _LINUX_MSDOS_FS_H
  3. #define _LINUX_MSDOS_FS_H
  5. #include <linux/types.h>
  6. #include <linux/magic.h>
  7. #include <asm/byteorder.h>
  9. /*
  10.  * The MS-DOS filesystem constants/structures
  11.  */
  13. #ifndef SECTOR_SIZE
  14. #define SECTOR_SIZE	512		/* sector size (bytes) */
  15. #endif
  16. #define SECTOR_BITS	9		/* log2(SECTOR_SIZE) */
  17. #define MSDOS_DPB	(MSDOS_DPS)	/* dir entries per block */
  18. #define MSDOS_DPB_BITS	4		/* log2(MSDOS_DPB) */
  19. #define MSDOS_DPS	(SECTOR_SIZE / sizeof(struct msdos_dir_entry))
  20. #define MSDOS_DPS_BITS	4		/* log2(MSDOS_DPS) */
  21. #define MSDOS_LONGNAME	256		/* maximum name length */
  22. #define CF_LE_W(v)	le16_to_cpu(v)
  23. #define CF_LE_L(v)	le32_to_cpu(v)
  24. #define CT_LE_W(v)	cpu_to_le16(v)
  25. #define CT_LE_L(v)	cpu_to_le32(v)
  27. #define MSDOS_ROOT_INO	 1	/* The root inode number */
  28. #define MSDOS_FSINFO_INO 2	/* Used for managing the FSINFO block */
  30. #define MSDOS_DIR_BITS	5	/* log2(sizeof(struct msdos_dir_entry)) */
  32. /* directory limit */
  33. #define FAT_MAX_DIR_ENTRIES	(65536)
  34. #define FAT_MAX_DIR_SIZE	(FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
  36. #define ATTR_NONE	0	/* no attribute bits */
  37. #define ATTR_RO		1	/* read-only */
  38. #define ATTR_HIDDEN	2	/* hidden */
  39. #define ATTR_SYS	4	/* system */
  40. #define ATTR_VOLUME	8	/* volume label */
  41. #define ATTR_DIR	16	/* directory */
  42. #define ATTR_ARCH	32	/* archived */
  44. /* attribute bits that are copied "as is" */
  45. #define ATTR_UNUSED	(ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
  46. /* bits that are used by the Windows 95/Windows NT extended FAT */
  47. #define ATTR_EXT	(ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
  49. #define CASE_LOWER_BASE	8	/* base is lower case */
  50. #define CASE_LOWER_EXT	16	/* extension is lower case */
  52. #define DELETED_FLAG	0xe5	/* marks file as deleted when in name[0] */
  53. #define IS_FREE(n)	(!*(n) || *(n) == DELETED_FLAG)
  55. #define FAT_LFN_LEN	255	/* maximum long name length */
  56. #define MSDOS_NAME	11	/* maximum name length */
  57. #define MSDOS_SLOTS	21	/* max # of slots for short and long names */
  58. #define MSDOS_DOT	".          "	/* ".", padded to MSDOS_NAME chars */
  59. #define MSDOS_DOTDOT	"..         "	/* "..", padded to MSDOS_NAME chars */
  61. /* start of data cluster's entry (number of reserved clusters) */
  62. #define FAT_START_ENT	2
  64. /* maximum number of clusters */
  65. #define MAX_FAT12	0xFF4
  66. #define MAX_FAT16	0xFFF4
  67. #define MAX_FAT32	0x0FFFFFF6
  69. /* bad cluster mark */
  70. #define BAD_FAT12	0xFF7
  71. #define BAD_FAT16	0xFFF7
  72. #define BAD_FAT32	0x0FFFFFF7
  74. /* standard EOF */
  75. #define EOF_FAT12	0xFFF
  76. #define EOF_FAT16	0xFFFF
  77. #define EOF_FAT32	0x0FFFFFFF
  79. #define FAT_ENT_FREE	(0)
  80. #define FAT_ENT_BAD	(BAD_FAT32)
  81. #define FAT_ENT_EOF	(EOF_FAT32)
  83. #define FAT_FSINFO_SIG1	0x41615252
  84. #define FAT_FSINFO_SIG2	0x61417272
  85. #define IS_FSINFO(x)	(le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
  86. 			 && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
  88. #define FAT_STATE_DIRTY 0x01
  90. struct __fat_dirent {
  91. 	long		d_ino;
  92. 	__kernel_off_t	d_off;
  93. 	unsigned short	d_reclen;
  94. 	char		d_name[256]; /* We must not include limits.h! */
  95. };
  97. /*
  98.  * ioctl commands
  99.  */
  100. #define VFAT_IOCTL_READDIR_BOTH		_IOR('r', 1, struct __fat_dirent[2])
  101. #define VFAT_IOCTL_READDIR_SHORT	_IOR('r', 2, struct __fat_dirent[2])
  102. /* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
  103. #define FAT_IOCTL_GET_ATTRIBUTES	_IOR('r', 0x10, __u32)
  104. #define FAT_IOCTL_SET_ATTRIBUTES	_IOW('r', 0x11, __u32)
  105. /*Android kernel has used 0x12, so we use 0x13*/
  106. #define FAT_IOCTL_GET_VOLUME_ID		_IOR('r', 0x13, __u32)
  108. struct fat_boot_sector {
  109. 	__u8	ignored[3];	/* Boot strap short or near jump */
  110. 	__u8	system_id[8];	/* Name - can be used to special case
  111. 				   partition manager volumes */
  112. 	__u8	sector_size[2];	/* bytes per logical sector */
  113. 	__u8	sec_per_clus;	/* sectors/cluster */
  114. 	__le16	reserved;	/* reserved sectors */
  115. 	__u8	fats;		/* number of FATs */
  116. 	__u8	dir_entries[2];	/* root directory entries */
  117. 	__u8	sectors[2];	/* number of sectors */
  118. 	__u8	media;		/* media code */
  119. 	__le16	fat_length;	/* sectors/FAT */
  120. 	__le16	secs_track;	/* sectors per track */
  121. 	__le16	heads;		/* number of heads */
  122. 	__le32	hidden;		/* hidden sectors (unused) */
  123. 	__le32	total_sect;	/* number of sectors (if sectors == 0) */
  125. 	union {
  126. 		struct {
  127. 			/*  Extended BPB Fields for FAT16 */
  128. 			__u8	drive_number;	/* Physical drive number */
  129. 			__u8	state;		/* undocumented, but used
  130. 						   for mount state. */
  131. 			__u8	signature;  /* extended boot signature */
  132. 			__u8	vol_id[4];	/* volume ID */
  133. 			__u8	vol_label[MSDOS_NAME];	/* volume label */
  134. 			__u8	fs_type[8];		/* file system type */
  135. 			/* other fields are not added here */
  136. 		} fat16;
  138. 		struct {
  139. 			/* only used by FAT32 */
  140. 			__le32	length;		/* sectors/FAT */
  141. 			__le16	flags;		/* bit 8: fat mirroring,
  142. 						   low 4: active fat */
  143. 			__u8	version[2];	/* major, minor filesystem
  144. 						   version */
  145. 			__le32	root_cluster;	/* first cluster in
  146. 						   root directory */
  147. 			__le16	info_sector;	/* filesystem info sector */
  148. 			__le16	backup_boot;	/* backup boot sector */
  149. 			__le16	reserved2[6];	/* Unused */
  150. 			/* Extended BPB Fields for FAT32 */
  151. 			__u8	drive_number;   /* Physical drive number */
  152. 			__u8    state;       	/* undocumented, but used
  153. 						   for mount state. */
  154. 			__u8	signature;  /* extended boot signature */
  155. 			__u8	vol_id[4];	/* volume ID */
  156. 			__u8	vol_label[MSDOS_NAME];	/* volume label */
  157. 			__u8	fs_type[8];		/* file system type */
  158. 			/* other fields are not added here */
  159. 		} fat32;
  160. 	};
  161. };
  163. struct fat_boot_fsinfo {
  164. 	__le32   signature1;	/* 0x41615252L */
  165. 	__le32   reserved1[120];	/* Nothing as far as I can tell */
  166. 	__le32   signature2;	/* 0x61417272L */
  167. 	__le32   free_clusters;	/* Free cluster count.  -1 if unknown */
  168. 	__le32   next_cluster;	/* Most recently allocated cluster */
  169. 	__le32   reserved2[4];
  170. };
  172. struct msdos_dir_entry {
  173. 	__u8	name[MSDOS_NAME];/* name and extension */
  174. 	__u8	attr;		/* attribute bits */
  175. 	__u8    lcase;		/* Case for base and extension */
  176. 	__u8	ctime_cs;	/* Creation time, centiseconds (0-199) */
  177. 	__le16	ctime;		/* Creation time */
  178. 	__le16	cdate;		/* Creation date */
  179. 	__le16	adate;		/* Last access date */
  180. 	__le16	starthi;	/* High 16 bits of cluster in FAT32 */
  181. 	__le16	time,date,start;/* time, date and first cluster */
  182. 	__le32	size;		/* file size (in bytes) */
  183. };
  185. /* Up to 13 characters of the name */
  186. struct msdos_dir_slot {
  187. 	__u8    id;		/* sequence number for slot */
  188. 	__u8    name0_4[10];	/* first 5 characters in name */
  189. 	__u8    attr;		/* attribute byte */
  190. 	__u8    reserved;	/* always 0 */
  191. 	__u8    alias_checksum;	/* checksum for 8.3 alias */
  192. 	__u8    name5_10[12];	/* 6 more characters in name */
  193. 	__le16   start;		/* starting cluster number, 0 in long slots */
  194. 	__u8    name11_12[4];	/* last 2 characters in name */
  195. };
  197. #endif /* _LINUX_MSDOS_FS_H */