page-write.c File Reference

write logic for page ftl More...

#include "include/module.h"
#include "include/page.h"
#include "include/device.h"
#include "include/log.h"
#include "include/bits.h"
#include <pthread.h>
#include <assert.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <glib.h>

Include dependency graph for page-write.c:

Functions
static void	page_ftl_invalidate (struct page_ftl *pgftl, size_t lpn)
	invalidate a segment that including to the given LPN More...
static void	page_ftl_write_end_rq (struct device_request *request)
	write's end request function More...
static ssize_t	page_ftl_read_for_overwrite (struct page_ftl *pgftl, size_t lpn, void *buffer)
	read sequence for overwrite More...
void	page_ftl_write_update_metadata (struct page_ftl *pgftl, struct device_request *request)
ssize_t	page_ftl_write (struct page_ftl *pgftl, struct device_request *request)
	the core logic for writing the request to the device. More...

Detailed Description

write logic for page ftl

Author

Gijun Oh

Version

0.2

Date

2021-09-22

Function Documentation

page_ftl_invalidate()

static void page_ftl_invalidate ( struct page_ftl *  pgftl, size_t  lpn  )

static

invalidate a segment that including to the given LPN

Parameters

pgftl	pointer of the page FTL structure
lpn	logical page address to invalidate

< segment information update

< global information update

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page_ftl_read_for_overwrite()

static ssize_t page_ftl_read_for_overwrite ( struct page_ftl *  pgftl, size_t  lpn, void *  buffer  )

static

read sequence for overwrite

Parameters

pgftl	pointer of the page FTL
lpn	logical page address which wants to overwrite
buffer	a pointer to a buffer containing the result of the read

Returns

reading data size. a negative number means fail to read

Note

NAND-based storage doesn't allow to do overwrite. Therefore, you must use the out-of-place update. So this logic is necessary.

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page_ftl_write()

ssize_t page_ftl_write	(	struct page_ftl *	pgftl,
		struct device_request *	request
	)

the core logic for writing the request to the device.

Parameters

pgftl	pointer of the page FTL structure
request	user's request pointer

Returns

writing data size. a negative number means fail to write.

< global data retrieve

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page_ftl_write_end_rq()

static void page_ftl_write_end_rq ( struct device_request *  request )

static

write's end request function

Parameters

request

the request which is submitted before

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page_ftl_write_update_metadata()

void page_ftl_write_update_metadata	(	struct page_ftl *	pgftl,
		struct device_request *	request
	)

< global information update

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