ramdisk.c File Reference

implementation of the ramdisk which is inherited by the device More...

#include <fcntl.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "include/flash.h"
#include "include/ramdisk.h"
#include "include/device.h"
#include "include/log.h"
#include "include/bits.h"

Include dependency graph for ramdisk.c:

Functions
int	ramdisk_open (struct device *dev, const char *name, int flags)
	open the ramdisk (allocate the device resources) More...
ssize_t	ramdisk_write (struct device *dev, struct device_request *request)
	write to the ramdisk More...
ssize_t	ramdisk_read (struct device *dev, struct device_request *request)
	read from the ramdisk More...
int	ramdisk_erase (struct device *dev, struct device_request *request)
	erase a segment More...
int	ramdisk_close (struct device *dev)
	close the ramdisk More...
int	ramdisk_device_init (struct device *dev, uint64_t flags)
	initialize the device and ramdisk module More...
int	ramdisk_device_exit (struct device *dev)
	deallocate the device module More...

Variables
const struct device_operations	__ramdisk_dops
	ramdisk operations More...

Detailed Description

implementation of the ramdisk which is inherited by the device

Author

Gijun Oh

Version

0.2

Date

2021-10-03

Function Documentation

ramdisk_close()

int ramdisk_close

(

struct device *

dev

)

close the ramdisk

Parameters

dev	pointer of the device structure

Returns

0 for success, negative value for fail

ramdisk_device_exit()

int ramdisk_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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ramdisk_device_init()

int ramdisk_device_init	(	struct device *	dev,
		uint64_t	flags
	)

initialize the device and ramdisk module

Parameters

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

Returns

0 for sucess, negative value for fail

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ramdisk_erase()

int ramdisk_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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ramdisk_open()

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

open the ramdisk (allocate the device resources)

Parameters

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

Returns

0 for success, negative value to fail

< This for make 4GiB disk

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ramdisk_read()

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

read from the ramdisk

Parameters

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

Returns

read size (bytes)

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ramdisk_write()

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

write to the ramdisk

Parameters

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

Returns

written size (bytes)

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Variable Documentation

__ramdisk_dops

const struct device_operations __ramdisk_dops

Initial value:

= {
    .open = ramdisk_open,
    .write = ramdisk_write,
    .read = ramdisk_read,
    .erase = ramdisk_erase,
    .close = ramdisk_close,
}

ramdisk operations