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233 lines
7.3 KiB
233 lines
7.3 KiB
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* R/O (V)FAT 12/16/32 filesystem implementation by Marcus Sundberg
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*
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* 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6
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* 2003-03-10 - kharris@nexus-tech.net - ported to u-boot
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*/
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#ifndef _FAT_H_
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#define _FAT_H_
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#include <fs.h>
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#include <asm/byteorder.h>
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#include <asm/cache.h>
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struct disk_partition;
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/* Maximum Long File Name length supported here is 128 UTF-16 code units */
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#define VFAT_MAXLEN_BYTES 256 /* Maximum LFN buffer in bytes */
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#define VFAT_MAXSEQ 9 /* Up to 9 of 13 2-byte UTF-16 entries */
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#define PREFETCH_BLOCKS 2
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#define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE
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#define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
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sizeof(dir_entry))
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#define FATBUFBLOCKS 6
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#define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS)
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#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
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#define FAT16BUFSIZE (FATBUFSIZE/2)
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#define FAT32BUFSIZE (FATBUFSIZE/4)
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/* Maximum number of entry for long file name according to spec */
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#define MAX_LFN_SLOT 20
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/* Filesystem identifiers */
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#define FAT12_SIGN "FAT12 "
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#define FAT16_SIGN "FAT16 "
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#define FAT32_SIGN "FAT32 "
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#define SIGNLEN 8
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/* File attributes */
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#define ATTR_RO 1
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#define ATTR_HIDDEN 2
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#define ATTR_SYS 4
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#define ATTR_VOLUME 8
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#define ATTR_DIR 16
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#define ATTR_ARCH 32
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#define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
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#define DELETED_FLAG ((char)0xe5) /* Marks deleted files when in name[0] */
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#define aRING 0x05 /* Used as special character in name[0] */
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/*
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* Indicates that the entry is the last long entry in a set of long
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* dir entries
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*/
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#define LAST_LONG_ENTRY_MASK 0x40
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#define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
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#define FSTYPE_NONE (-1)
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#if defined(__linux__) && defined(__KERNEL__)
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#define FAT2CPU16 le16_to_cpu
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#define FAT2CPU32 le32_to_cpu
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#else
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#if __LITTLE_ENDIAN
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#define FAT2CPU16(x) (x)
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#define FAT2CPU32(x) (x)
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#else
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#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
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#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0xff000000) >> 24))
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#endif
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#endif
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#define START(dent) (FAT2CPU16((dent)->start) \
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+ (mydata->fatsize != 32 ? 0 : \
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(FAT2CPU16((dent)->starthi) << 16)))
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#define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \
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((fatsize) != 16 ? 0xff8 : 0xfff8) : \
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0xffffff8))
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#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
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(x) >= ((fatsize) != 32 ? \
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((fatsize) != 16 ? 0xff0 : 0xfff0) : \
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0xffffff0))
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typedef struct boot_sector {
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__u8 ignored[3]; /* Bootstrap code */
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char system_id[8]; /* Name of fs */
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__u8 sector_size[2]; /* Bytes/sector */
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__u8 cluster_size; /* Sectors/cluster */
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__u16 reserved; /* Number of reserved sectors */
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__u8 fats; /* Number of FATs */
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__u8 dir_entries[2]; /* Number of root directory entries */
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__u8 sectors[2]; /* Number of sectors */
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__u8 media; /* Media code */
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__u16 fat_length; /* Sectors/FAT */
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__u16 secs_track; /* Sectors/track */
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__u16 heads; /* Number of heads */
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__u32 hidden; /* Number of hidden sectors */
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__u32 total_sect; /* Number of sectors (if sectors == 0) */
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/* FAT32 only */
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__u32 fat32_length; /* Sectors/FAT */
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__u16 flags; /* Bit 8: fat mirroring, low 4: active fat */
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__u8 version[2]; /* Filesystem version */
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__u32 root_cluster; /* First cluster in root directory */
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__u16 info_sector; /* Filesystem info sector */
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__u16 backup_boot; /* Backup boot sector */
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__u16 reserved2[6]; /* Unused */
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} boot_sector;
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typedef struct volume_info
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{
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__u8 drive_number; /* BIOS drive number */
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__u8 reserved; /* Unused */
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__u8 ext_boot_sign; /* 0x29 if fields below exist (DOS 3.3+) */
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__u8 volume_id[4]; /* Volume ID number */
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char volume_label[11]; /* Volume label */
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char fs_type[8]; /* Typically FAT12, FAT16, or FAT32 */
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/* Boot code comes next, all but 2 bytes to fill up sector */
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/* Boot sign comes last, 2 bytes */
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} volume_info;
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/* see dir_entry::lcase: */
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#define CASE_LOWER_BASE 8 /* base (name) is lower case */
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#define CASE_LOWER_EXT 16 /* extension is lower case */
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struct nameext {
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char name[8];
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char ext[3];
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};
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typedef struct dir_entry {
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struct nameext nameext; /* Name and extension */
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__u8 attr; /* Attribute bits */
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__u8 lcase; /* Case for name and ext (CASE_LOWER_x) */
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__u8 ctime_ms; /* Creation time, milliseconds */
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__u16 ctime; /* Creation time */
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__u16 cdate; /* Creation date */
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__u16 adate; /* Last access date */
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__u16 starthi; /* High 16 bits of cluster in FAT32 */
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__u16 time,date,start;/* Time, date and first cluster */
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__u32 size; /* File size in bytes */
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} dir_entry;
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typedef struct dir_slot {
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__u8 id; /* Sequence number for slot */
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__u8 name0_4[10]; /* First 5 characters in name */
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__u8 attr; /* Attribute byte */
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__u8 reserved; /* Unused */
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__u8 alias_checksum;/* Checksum for 8.3 alias */
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__u8 name5_10[12]; /* 6 more characters in name */
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__u16 start; /* Unused */
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__u8 name11_12[4]; /* Last 2 characters in name */
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} dir_slot;
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/*
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* Private filesystem parameters
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*
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* Note: FAT buffer has to be 32 bit aligned
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* (see FAT32 accesses)
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*/
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typedef struct {
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__u8 *fatbuf; /* Current FAT buffer */
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int fatsize; /* Size of FAT in bits */
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__u32 fatlength; /* Length of FAT in sectors */
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__u16 fat_sect; /* Starting sector of the FAT */
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__u8 fat_dirty; /* Set if fatbuf has been modified */
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__u32 rootdir_sect; /* Start sector of root directory */
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__u16 sect_size; /* Size of sectors in bytes */
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__u16 clust_size; /* Size of clusters in sectors */
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int data_begin; /* The sector of the first cluster, can be negative */
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int fatbufnum; /* Used by get_fatent, init to -1 */
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int rootdir_size; /* Size of root dir for non-FAT32 */
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__u32 root_cluster; /* First cluster of root dir for FAT32 */
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u32 total_sect; /* Number of sectors */
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int fats; /* Number of FATs */
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} fsdata;
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struct fat_itr;
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typedef struct fat_itr fat_itr;
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static inline u32 clust_to_sect(fsdata *fsdata, u32 clust)
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{
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return fsdata->data_begin + clust * fsdata->clust_size;
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}
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static inline u32 sect_to_clust(fsdata *fsdata, int sect)
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{
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return (sect - fsdata->data_begin) / fsdata->clust_size;
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}
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int file_fat_detectfs(void);
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int fat_exists(const char *filename);
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int fat_size(const char *filename, loff_t *size);
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int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
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loff_t maxsize, loff_t *actread);
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int file_fat_read(const char *filename, void *buffer, int maxsize);
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int fat_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info);
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int fat_register_device(struct blk_desc *dev_desc, int part_no);
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int file_fat_write(const char *filename, void *buf, loff_t offset, loff_t len,
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loff_t *actwrite);
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int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
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loff_t *actread);
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int fat_opendir(const char *filename, struct fs_dir_stream **dirsp);
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int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp);
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void fat_closedir(struct fs_dir_stream *dirs);
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int fat_unlink(const char *filename);
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int fat_mkdir(const char *dirname);
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void fat_close(void);
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void *fat_next_cluster(fat_itr *itr, unsigned int *nbytes);
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/**
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* fat_uuid() - get FAT volume ID
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*
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* The FAT volume ID returned in @uuid_str as hexadecimal number in XXXX-XXXX
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* format.
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*
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* @uuid_str: caller allocated buffer of at least 10 bytes for the volume ID
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* Return: 0 on success
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*/
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int fat_uuid(char *uuid_str);
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#endif /* _FAT_H_ */
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