PHAT Block I/O

Reading and writing data blocks. More...

Collaboration diagram for PHAT Block I/O:

Functions
int	PhatSectorWrite (NUTDEVICE *dev, uint32_t sect, const void *data, int num)
	Directly write consecutive sectors.
int	PhatSectorFlush (NUTDEVICE *dev, int bufnum)
	Flush sector buffers.
int	PhatSectorRead (NUTFILE *blkmnt, uint32_t sect, uint8_t *buf)
	Read sector.
int	PhatSectorLoad (NUTDEVICE *dev, uint32_t sect)
void	PhatSectorBufferRelease (NUTDEVICE *dev, int bufnum)

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Detailed Description

Reading and writing data blocks.

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Function Documentation

int PhatSectorWrite	(	NUTDEVICE *	dev,
		uint32_t	sect,
		const void *	data,
		int	num
	)

Directly write consecutive sectors.

References _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, EIO, errno, NUTBLKDEV_SEEK, NutEventPost(), NutEventWait(), _BLKPAR_SEEK::par_blknum, _BLKPAR_SEEK::par_nfp, rc, _PHATSECTBUF::sect_dirty, _PHATSECTBUF::sect_lock, _PHATSECTBUF::sect_num, _PHATVOL::vol_buf, and _PHATVOL::vol_iomutex.

Referenced by PhatFileWrite().

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int PhatSectorFlush	(	NUTDEVICE *	dev,
		int	bufnum
	)

Flush sector buffers.

The volume must be locked before calling this function.

Parameters:

dev	Specifies the file system device.
bufnum	The buffer number to flush. If -1, all buffers are flushed.

Returns:

0 on success, -1 on failures.

References _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, EIO, errno, NUTBLKDEV_SEEK, _BLKPAR_SEEK::par_blknum, _BLKPAR_SEEK::par_nfp, _PHATSECTBUF::sect_data, _PHATSECTBUF::sect_dirty, _PHATSECTBUF::sect_num, and _PHATVOL::vol_buf.

Referenced by PhatSectorLoad().

int PhatSectorRead	(	NUTFILE *	blkmnt,
		uint32_t	sect,
		uint8_t *	buf
	)

Read sector.

The volume must be locked before calling this function.

Parameters:

blkmnt	Specifies the mounted block device partition.
sect	Sector to load.
buf	Points to a buffer which will receive the sector data.

Returns:

0 on success, -1 on failures.

References _NUTDEVICE::dev_ioctl, _NUTDEVICE::dev_read, EIO, errno, _NUTFILE::nf_dev, NUTBLKDEV_SEEK, _BLKPAR_SEEK::par_blknum, and _BLKPAR_SEEK::par_nfp.

Referenced by PhatSectorLoad(), and PhatVolMount().

int PhatSectorLoad	(	NUTDEVICE *	dev,
		uint32_t	sect
	)

References _NUTDEVICE::dev_dcb, _NUTDEVICE::dev_icb, NutEventPost(), NutEventWait(), NutSleep(), PhatSectorFlush(), PhatSectorRead(), _PHATSECTBUF::sect_data, _PHATSECTBUF::sect_lock, _PHATSECTBUF::sect_num, _PHATVOL::vol_buf, and _PHATVOL::vol_iomutex.

Referenced by Phat12GetClusterLink(), Phat12SetClusterLink(), Phat16GetClusterLink(), Phat16SetClusterLink(), Phat32FreeClusters(), Phat32GetClusterLink(), Phat32SetClusterLink(), PhatDirEntryUpdate(), PhatFileRead(), and PhatFileWrite().

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void PhatSectorBufferRelease	(	NUTDEVICE *	dev,
		int	bufnum
	)

References _NUTDEVICE::dev_dcb, _PHATSECTBUF::sect_lock, and _PHATVOL::vol_buf.

Referenced by Phat32FreeClusters(), Phat32GetClusterLink(), Phat32SetClusterLink(), PhatDirEntryUpdate(), PhatFileRead(), and PhatFileWrite().