bluedbm.c File Reference

implementation of the bluedbm abstraction layer which is inherited by the device More...

#include <stdlib.h>
#include <errno.h>
#include <libmemio.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>
#include "include/bluedbm.h"
#include "include/device.h"
#include "include/log.h"
#include "include/bits.h"

Include dependency graph for bluedbm.c:

Functions
static void	bluedbm_erase_end_request (uint64_t segnum, uint8_t is_bad)
	end request for the erase More...
static int	bluedbm_clear (struct device *dev)
	clear all segments in the flash board More...
static void	bluedbm_wait_erase_finish (struct device *dev, size_t segnum, size_t nr_segments)
	wait the erase is finished More...
int	bluedbm_open (struct device *dev, const char *name, int flags)
	open the bluedbm based device More...
static void	bluedbm_end_rw_request (async_bdbm_req *rw_req)
	end request for the read/write More...
ssize_t	bluedbm_write (struct device *dev, struct device_request *request)
	write to the flash board More...
ssize_t	bluedbm_read (struct device *dev, struct device_request *request)
	read from the flash board More...
int	bluedbm_erase (struct device *dev, struct device_request *request)
	erase a segment More...
int	bluedbm_close (struct device *dev)
	close the bluedbm More...
int	bluedbm_device_init (struct device *dev, uint64_t flags)
	initialize the device and bluedbm module More...
int	bluedbm_device_exit (struct device *dev)
	deallocate the device module More...

Variables
gint *	g_badseg_counter = NULL
gint *	g_erase_counter = NULL
const struct device_operations	__bluedbm_dops
	bluedbm module operations More...

Detailed Description

implementation of the bluedbm abstraction layer which is inherited by the device

Author

Gijun Oh

Version

0.2

Date

2021-10-20

Function Documentation

bluedbm_clear()

static int bluedbm_clear ( struct device *  dev )

static

clear all segments in the flash board

Parameters

dev	pointer of the device structure

Returns

0 for success, negative value for fail

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bluedbm_close()

int bluedbm_close

(

struct device *

dev

)

close the bluedbm

Parameters

dev	pointer of the device structure

Returns

0 for success, negative value for fail

bluedbm_device_exit()

int bluedbm_device_exit

(

struct device *

dev

)

deallocate the device module

Parameters

dev	pointer of the device structure

Returns

0 for success, negative value for fail

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bluedbm_device_init()

int bluedbm_device_init	(	struct device *	dev,
		uint64_t	flags
	)

initialize the device and bluedbm module

Parameters

dev	pointer of the device structure
flags	flags for bluedbm and device

Returns

0 for success, negative value for fail

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bluedbm_end_rw_request()

static void bluedbm_end_rw_request ( async_bdbm_req *  rw_req )

static

end request for the read/write

Parameters

rw_req

read/write request pointer

bluedbm_erase()

int bluedbm_erase	(	struct device *	dev,
		struct device_request *	request
	)

erase a segment

Parameters

dev	pointer of the device structure
request	pointer of the device request structure

Returns

0 for success, negative value for fail

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bluedbm_erase_end_request()

static void bluedbm_erase_end_request ( uint64_t  segnum, uint8_t  is_bad  )

static

end request for the erase

Parameters

segnum	erased segment number
is_bad	erased segment is bad segment or not

Note

Do not use the non atomic operation or complex operation in this routine. It may occur serious problem.

bluedbm_open()

int bluedbm_open	(	struct device *	dev,
		const char *	name,
		int	flags
	)

open the bluedbm based device

Parameters

dev	pointer of the device structure
name	this does not use in this module
flags	open flags for this module

Returns

0 for success, negative value to fail

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bluedbm_read()

ssize_t bluedbm_read	(	struct device *	dev,
		struct device_request *	request
	)

read from the flash board

Parameters

dev	pointer of the device structure
request	pointer of the device request structure

Returns

read size (bytes)

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bluedbm_wait_erase_finish()

static void bluedbm_wait_erase_finish ( struct device *  dev, size_t  segnum, size_t  nr_segments  )

static

wait the erase is finished

Parameters

dev	pointer of the device structure
segnum	initial position to erase target segment
nr_segments	number of segments to erase

Note

If you fail to execute the erase the target segment, this function may block the thread forever.

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bluedbm_write()

ssize_t bluedbm_write	(	struct device *	dev,
		struct device_request *	request
	)

write to the flash board

Parameters

dev	pointer of the device structure
request	pointer of the device request structure

Returns

written size (bytes)

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Variable Documentation

__bluedbm_dops

const struct device_operations __bluedbm_dops

Initial value:

= {
    .open = bluedbm_open,
    .write = bluedbm_write,
    .read = bluedbm_read,
    .erase = bluedbm_erase,
    .close = bluedbm_close,
}

bluedbm module operations

g_badseg_counter

gint* g_badseg_counter = NULL

counter for bad segemnt detection

g_erase_counter

gint* g_erase_counter = NULL

counter for # of erase in the segment