page-core.c File Reference

core logic for page ftl More...

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

Include dependency graph for page-core.c:

Functions
static size_t	page_ftl_get_free_pages (struct page_ftl *pgftl)
	get number of invalid pages in the ftl More...
static ssize_t	page_ftl_gc_from_list (struct page_ftl *pgftl, struct device_request *request)
	do garbage collection from the gc list More...
static void *	page_ftl_gc_thread (void *data)
	do garbage collection thread More...
static int	page_ftl_alloc_bitmap (struct page_ftl *pgftl, uint64_t **bitmap)
	allocate the segment's bitmap More...
int	page_ftl_segment_data_init (struct page_ftl *pgftl, struct page_ftl_segment *segment)
	initialize the page ftl's segment data only More...
static int	page_ftl_init_segment (struct page_ftl *pgftl)
	initialize each segment's metadata More...
int	page_ftl_open (struct page_ftl *pgftl, const char *name, int flags)
	allocate the page ftl structure's members More...
ssize_t	page_ftl_submit_request (struct page_ftl *pgftl, struct device_request *request)
	submit the request to the valid function More...
static void	page_ftl_free_segments (struct page_ftl *pgftl)
	deallocate the ftl's segments More...
int	page_ftl_close (struct page_ftl *pgftl)
	deallocate the page ftl structure's members More...

Variables
static int	is_gc_thread_exit

Detailed Description

core logic for page ftl

Author

Gijun Oh

Version

0.2

Date

2021-09-22

Function Documentation

page_ftl_alloc_bitmap()

static int page_ftl_alloc_bitmap ( struct page_ftl *  pgftl, uint64_t **  bitmap  )

static

allocate the segment's bitmap

Parameters

pgftl	pointer of the page-ftl structure
bitmap	double pointer of the bitmap

Returns

0 for successfully allocated

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page_ftl_close()

int page_ftl_close

(

struct page_ftl *

pgftl

)

deallocate the page ftl structure's members

Parameters

pgftl

pointer of the page ftl structure

Returns

zero to success, negative number to fail

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page_ftl_free_segments()

static void page_ftl_free_segments ( struct page_ftl *  pgftl )

static

deallocate the ftl's segments

Parameters

segments

pointer of the segment array

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page_ftl_gc_from_list()

static ssize_t page_ftl_gc_from_list ( struct page_ftl *  pgftl, struct device_request *  request  )

static

do garbage collection from the gc list

Parameters

pgftl	pointer of the page ftl
request	pointer of the request

Returns

number of erased segments

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page_ftl_gc_thread()

static void* page_ftl_gc_thread ( void *  data )

static

do garbage collection thread

Parameters

data	containing the pointer of the page ftl structure

Returns

NULL

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page_ftl_get_free_pages()

static size_t page_ftl_get_free_pages ( struct page_ftl *  pgftl )

static

get number of invalid pages in the ftl

Parameters

pgftl

pointer of the page ftl structure

Returns

number of the invalid pages

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page_ftl_init_segment()

static int page_ftl_init_segment ( struct page_ftl *  pgftl )

static

initialize each segment's metadata

Parameters

pgftl

pointer of the page ftl structure

Returns

0 to success, negative value to fail

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page_ftl_open()

int page_ftl_open	(	struct page_ftl *	pgftl,
		const char *	name,
		int	flags
	)

allocate the page ftl structure's members

Parameters

pgftl	pointer of the page ftl structure
name	file's name for open
flags	flags for open

Returns

zero to success, negative number to fail

Todo:

you must make a recovery process

initialize the mapping table

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page_ftl_segment_data_init()

int page_ftl_segment_data_init	(	struct page_ftl *	pgftl,
		struct page_ftl_segment *	segment
	)

initialize the page ftl's segment data only

Parameters

pgftl	pointer of the page-ftl structure
segment	pointer of the target segment

Returns

0 for successfully initialized

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page_ftl_submit_request()

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

submit the request to the valid function

Parameters

pgftl	pointer of the page ftl structure
request	pointer of the request

Returns

read and write return the size of the submit, fail to return the nugative value

Note

garbage collection doesn't free the request.

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Variable Documentation

is_gc_thread_exit

int is_gc_thread_exit

static