fat32.c File Reference

#include <miniOS/io.h>
#include <miniOS/fs/fat32.h>
#include <miniOS/fs/vfs.h>
#include <miniOS/drivers/block_layer.h>
#include <miniOS/drivers/block_device.h>
#include <string.h>

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Classes
struct	find_ctx
struct	readdir_ctx

Typedefs
typedef int(*)	fat32_scan_cb_t(const char *name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void *ud)

Functions
static int	read_part_sector (uint32_t part_sector, void *buf)
static uint32_t	fat_entry (uint32_t cluster)
static uint32_t	cluster_to_part_sector (uint32_t cluster)
static uint32_t	entry_cluster (const fat32_dir_entry_t *e)
static uint8_t	lfn_checksum (const char *name11)
static uint32_t	lfn_decode (const uint16_t *lfn, int slot_count, char *out, uint32_t out_size)
static uint32_t	short_name (const fat32_dir_entry_t *e, char *out, uint32_t out_size)
static int	fat32_scan_dir (uint32_t dir_cluster, uint64_t *offset_p, fat32_scan_cb_t cb, void *ud)
static int	find_entry_cb (const char *name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void *ud)
static int	fat32_lookup (const char *path, vfs_inode_info_t *out)
static int	readdir_adapter (const char *name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void *ud)
static int	fat32_readdir (uint32_t ino, uint64_t *offset, vfs_dirent_cb_t cb, void *ud)
static int	fat32_read (uint32_t ino, uint64_t off, void *buf, uint32_t len)
static int	fat32_statfs (vfs_statfs_t *out)
static void	fat32_do_unmount (void)
int	fat32_mount (uint64_t part_lba_start, uint64_t part_lba_end)
static int	fat32_fs_mount (const char *source, const char *target, const void *data)
void	fat32_init (void)

Variables
static uint64_t	g_part_start
static uint64_t	g_part_end
static uint32_t	g_bytes_per_sector
static uint32_t	g_sectors_per_cluster
static uint32_t	g_first_data_sector
static uint32_t	g_fat_start_sector
static uint32_t	g_root_cluster
static uint8_t	g_fat_buf [512]
static uint8_t	g_dir_buf [512]
static int	g_fat32_mounted = 0
static vfs_ops_t	g_fat32_ops

Typedef Documentation

fat32_scan_cb_t

typedef int(*) fat32_scan_cb_t(const char *name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void *ud)

Function Documentation

cluster_to_part_sector()

uint32_t cluster_to_part_sector ( uint32_t cluster )

static

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entry_cluster()

uint32_t entry_cluster ( const fat32_dir_entry_t * e )

static

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fat32_do_unmount()

void fat32_do_unmount ( void )

static

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fat32_fs_mount()

int fat32_fs_mount ( const char * source, const char * target, const void * data )

static

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fat32_init()

void fat32_init

(

void

)

fat32_init() - Register the FAT32 filesystem type with the VFS registry.

After this call, vfs_mount_fstype("fat32", source, target, data) can be used to mount any FAT32 partition by passing a vfs_mount_data_t as @data. fat32_init() does NOT mount anything itself; it only registers the type. Call once during kernel startup, before the first FAT32 mount.

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fat32_lookup()

int fat32_lookup ( const char * path, vfs_inode_info_t * out )

static

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fat32_mount()

int fat32_mount	(	uint64_t	part_lba_start,
		uint64_t	part_lba_end )

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fat32_read()

int fat32_read ( uint32_t ino, uint64_t off, void * buf, uint32_t len )

static

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fat32_readdir()

int fat32_readdir ( uint32_t ino, uint64_t * offset, vfs_dirent_cb_t cb, void * ud )

static

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fat32_scan_dir()

int fat32_scan_dir ( uint32_t dir_cluster, uint64_t * offset_p, fat32_scan_cb_t cb, void * ud )

static

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fat32_statfs()

int fat32_statfs ( vfs_statfs_t * out )

static

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fat_entry()

uint32_t fat_entry ( uint32_t cluster )

static

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find_entry_cb()

int find_entry_cb ( const char * name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void * ud )

static

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lfn_checksum()

uint8_t lfn_checksum ( const char * name11 )

static

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lfn_decode()

uint32_t lfn_decode ( const uint16_t * lfn, int slot_count, char * out, uint32_t out_size )

static

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read_part_sector()

int read_part_sector ( uint32_t part_sector, void * buf )

static

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readdir_adapter()

int readdir_adapter ( const char * name, uint8_t name_len, uint32_t cluster, uint8_t is_dir, uint32_t filesize, void * ud )

static

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short_name()

uint32_t short_name ( const fat32_dir_entry_t * e, char * out, uint32_t out_size )

static

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Variable Documentation

g_bytes_per_sector

uint32_t g_bytes_per_sector

static

g_dir_buf

uint8_t g_dir_buf[512]

static

g_fat32_mounted

int g_fat32_mounted = 0

static

g_fat32_ops

vfs_ops_t g_fat32_ops

static

Initial value:

                             = {
    .lookup  = fat32_lookup,
    .read    = fat32_read,
    .readdir = fat32_readdir,
    .statfs  = fat32_statfs,
    .unmount = fat32_do_unmount,
}

g_fat_buf

uint8_t g_fat_buf[512]

static

g_fat_start_sector

uint32_t g_fat_start_sector

static

g_first_data_sector

uint32_t g_first_data_sector

static

g_part_end

uint64_t g_part_end

static

g_part_start

uint64_t g_part_start

static

g_root_cluster

uint32_t g_root_cluster

static

g_sectors_per_cluster

uint32_t g_sectors_per_cluster

static