Block Layer

A simple, cached block layer that abstracts the underlying ATA driver. More...

Functions
int	block_read (uint64_t lba, uint16_t count, void *buf)
	Reads count blocks starting at lba into buf. If count is 1, this operation will be serviced by the cache. Multi-block reads currently bypass the cache and read directly from the disk.
int	block_write (uint64_t lba, uint16_t count, const void *buf)
	Writes count blocks starting at lba. This is a write-through operation. The data is written to the underlying disk, and if a cached copy of the block exists, it is updated.
void	block_layer_init (void)
	Called once during kernel startup to allocate memory for the cache and prepare the block layer for use.

Detailed Description

A simple, cached block layer that abstracts the underlying ATA driver.

Provides a block-oriented read/write interface with a write-through cache. Currently only supports single-block operations when caching is active.

Function Documentation

block_layer_init()

void block_layer_init

(

void

)

Called once during kernel startup to allocate memory for the cache and prepare the block layer for use.

block_layer_init() - Initializes the block layer and its cache.

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block_read()

int block_read	(	uint64_t	lba,
		uint16_t	count,
		void *	buf )

Reads count blocks starting at lba into buf. If count is 1, this operation will be serviced by the cache. Multi-block reads currently bypass the cache and read directly from the disk.

block_read() - Read one or more blocks from the block device. @lba: The logical block address to start reading from. @count: The number of blocks to read. @buf: A buffer large enough to hold count blocks.

Returns

0 on success, negative error code on failure.

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block_write()

int block_write	(	uint64_t	lba,
		uint16_t	count,
		const void *	buf )

Writes count blocks starting at lba. This is a write-through operation. The data is written to the underlying disk, and if a cached copy of the block exists, it is updated.

block_write() - Write one or more blocks to the block device. @lba: The logical block address to start writing to. @count: The number of blocks to write. @buf: A buffer containing the data to write.

Returns

0 on success, negative error code on failure.

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