devfs.c File Reference

#include <kernel/fs/devfs.h>
#include <kernel/fs/dentry.h>
#include <kernel/fs/file.h>
#include <kernel/fs/filesystem.h>
#include <kernel/fs/inode.h>
#include <kernel/fs/mount.h>
#include <kernel/fs/namespace.h>
#include <kernel/fs/path.h>
#include <kernel/fs/superblock.h>
#include <kernel/fs/vfs.h>
#include <kernel/log/log.h>
#include <kernel/log/panic.h>
#include <kernel/sched/sched.h>
#include <kernel/sync/lock.h>
#include <assert.h>
#include <errno.h>
#include <stdatomic.h>
#include <stdlib.h>
#include <string.h>
#include <sys/io.h>
#include <sys/list.h>

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Functions
static dentry_t *	devfs_mount (filesystem_t *fs, block_device_t *device, void *private)
void	devfs_init (void)
	Initializes the devfs.
dentry_t *	devfs_dir_new (dentry_t *parent, const char *name, const inode_ops_t *inodeOps, void *private)
	Create a new directory inside a mounted devfs instance.
dentry_t *	devfs_file_new (dentry_t *parent, const char *name, const inode_ops_t *inodeOps, const file_ops_t *fileOps, void *private)
	Create a new file inside a mounted devfs instance.
dentry_t *	devfs_symlink_new (dentry_t *parent, const char *name, const inode_ops_t *inodeOps, void *private)
	Create a new symbolic link inside a mounted devfs instance.
uint64_t	devfs_files_new (list_t *out, dentry_t *parent, const devfs_file_desc_t *descs)
	Create multiple files in a devfs directory.
void	devfs_files_free (list_t *files)
	Free all files in a list created by devfs_files_new().

Variables
static dentry_t *	root = NULL
static file_ops_t	dirOps
static dentry_ops_t	dentryOps
static filesystem_t	devfs

Function Documentation

devfs_mount()

static dentry_t * devfs_mount ( filesystem_t *  fs, block_device_t *  device, void *  private  )

static

Definition at line 35 of file devfs.c.

devfs_init()

void devfs_init

(

void

)

Initializes the devfs.

Definition at line 49 of file devfs.c.

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devfs_dir_new()

dentry_t * devfs_dir_new	(	dentry_t *	parent,
		const char *	name,
		const inode_ops_t *	inodeOps,
		void *	private
	)

Create a new directory inside a mounted devfs instance.

Used to, for example, create a new directory for a device or resource inside /dev or /proc.

Parameters

parent	The parent directory, if NULL then the root is used.
name	The name of the new directory.
inodeOps	The inode operations for the new directory, can be NULL.
private	Private data to store in the inode of the new directory, can be NULL.

Returns

On success, the new devfs directory. On failure, NULL and errno is set.

Definition at line 81 of file devfs.c.

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devfs_file_new()

dentry_t * devfs_file_new	(	dentry_t *	parent,
		const char *	name,
		const inode_ops_t *	inodeOps,
		const file_ops_t *	fileOps,
		void *	private
	)

Create a new file inside a mounted devfs instance.

Used to, for example, create a new file for a device or resource inside /dev or /proc.

Parameters

parent	The parent directory, if NULL then the root is used.
name	The name of the new file.
inodeOps	The inode operations for the new file, can be NULL.
fileOps	The file operations for the new file, can be NULL.
private	Private data to store in the inode of the new file, can be NULL.

Returns

On success, the new devfs file. On failure, NULL and errno is set.

Definition at line 120 of file devfs.c.

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devfs_symlink_new()

dentry_t * devfs_symlink_new	(	dentry_t *	parent,
		const char *	name,
		const inode_ops_t *	inodeOps,
		void *	private
	)

Create a new symbolic link inside a mounted devfs instance.

Parameters

parent	The parent directory, if NULL then the root is used.
name	The name of the new symbolic link.
inodeOps	The inode operations for the new symbolic link.
private	Private data to store in the inode of the new symbolic link, can be NULL.

Returns

On success, the new devfs symbolic link. On failure, NULL and errno is set.

Definition at line 160 of file devfs.c.

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devfs_files_new()

uint64_t devfs_files_new	(	list_t *	out,
		dentry_t *	parent,
		const devfs_file_desc_t *	descs
	)

Create multiple files in a devfs directory.

Parameters

out	Output list to store created dentries, can be NULL. The dentries use the otherEntry list entry.
parent	The parent directory, if NULL then the root is used.
descs	Array of file descriptors, terminated by an entry with name == NULL.

Returns

On success, the number of files created. On failure, ERR and errno is set.

Definition at line 194 of file devfs.c.

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devfs_files_free()

void devfs_files_free

(

list_t *

files

)

Free all files in a list created by devfs_files_new().

Parameters

files

The list of files to free.

Definition at line 249 of file devfs.c.

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Variable Documentation

root

dentry_t* root = NULL

static

Definition at line 25 of file devfs.c.

dirOps

file_ops_t dirOps

static

Initial value:

= {
    .seek = file_generic_seek,
}

Definition at line 27 of file devfs.c.

dentryOps

dentry_ops_t dentryOps

static

Initial value:

= {
    .iterate = dentry_generic_iterate,
}

Definition at line 31 of file devfs.c.

devfs

filesystem_t devfs

static

Initial value:

= {
    .name = DEVFS_NAME,
    .mount = devfs_mount,
}

Definition at line 44 of file devfs.c.