FAT

FAT 12, 16, and 32-bit support for KOS's VFS More...

Topics
	Mount Flags
	Mount flags for fs_fat

Files
file	fs_fat.h
	VFS interface for a FAT filesystem.

Functions
int	fs_fat_init (void)
	Initialize fs_fat.
int	fs_fat_shutdown (void)
	Shut down fs_fat.
int	fs_fat_mount (const char *mp, kos_blockdev_t *dev, uint32_t flags)
	Mount a FAT filesystem in the VFS.
int	fs_fat_unmount (const char *mp)
	Unmount a FAT filesystem from the VFS.
int	fs_fat_sync (const char *mp)
	Sync a FAT filesystem, flushing all pending writes to the block device.

Detailed Description

FAT 12, 16, and 32-bit support for KOS's VFS

Function Documentation

fs_fat_init()

int fs_fat_init

(

void

)

Initialize fs_fat.

This function initializes fs_fat, preparing various internal structures for use.

Return values

0	On success. No error conditions currently defined.

Referenced by mount_sd_fat().

fs_fat_mount()

int fs_fat_mount	(	const char *	mp,
		kos_blockdev_t *	dev,
		uint32_t	flags )

Mount a FAT filesystem in the VFS.

This function mounts an fat filesystem to the specified mount point on the VFS. This function will detect whether or not an FAT filesystem exists on the given block device and mount it only if there is actually an FAT filesystem.

Parameters

mp	The path to mount the filesystem at.
dev	The block device containing the filesystem.
flags	Mount flags. Bitwise OR of values from fat_mount_flags

Return values

0	On success.
-1	On error.

Referenced by mount_sd_fat().

fs_fat_shutdown()

int fs_fat_shutdown

(

void

)

Shut down fs_fat.

This function shuts down fs_fat, basically undoing what fs_fat_init() did.

Return values

0	On success. No error conditions currently defined.

Referenced by unmount_sd_fat().

fs_fat_sync()

int fs_fat_sync

(

const char *

mp

)

Sync a FAT filesystem, flushing all pending writes to the block device.

This function completes all pending writes on the filesystem, making sure all data and metadata are in a consistent state on the block device. As both inode and block writes are normally postponed until they are either evicted from the cache or the filesystem is unmounted, doing this periodically may be a good idea if there is a chance that the filesystem will not be unmounted cleanly.

Note

This function has no effect if the filesystem was mounted read-only.

Parameters

mp	The mount point of the filesystem to be synced.

Return values

0	On success.
-1	On error.

fs_fat_unmount()

int fs_fat_unmount

(

const char *

mp

)

Unmount a FAT filesystem from the VFS.

This function unmoutns an FAT filesystem that was previously mounted by the fs_fat_mount() function.

Parameters

mp	The mount point of the filesystem to be unmounted.

Return values

0	On success.
-1	On error.

Referenced by unmount_sd_fat().