Orion

/*
 * This file controls the superblock for ProcFS.  It supports mounting new ProcFS
 * filesystems.  The VFS will use the calls here when dealing directly with the
 * filesystem structure.
 */

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "fs.h"
#include "../vfs.h"
#include "../super.h"
#include "../inode.h"
#include "../../mem/heap.h"

Inode *procfs_mount(FileSystemType *type, int flags,
                   const char *dev, void *data);
Inode *procfs_alloc_inode(SuperBlock *sb);

FileSystemType procfsType = {
	.name    = "ProcFS",
	.mount   = procfs_mount,
//	.kill_sb = procfs_kill_sb,
};

SuperOps procfsSuperOps = {
	.alloc_inode  = procfs_alloc_inode,
//	.free_inode   = procfs_free_inode,
//	.write_inode  = procfs_write_inode,
//	.delete_inode = procfs_delete_inode,
};

Inode procfsRoot = {
	.mode = S_IFDIR | 0755,
	.ops = &procfsInodeOps,
	.fileOps = &procfsFileOps,
	.size = 4096,
};

/* Mount a ProcFS instance */
Inode *
procfs_mount(FileSystemType *type, int flags, const char *dev, void *data)
{
	if (type != &procfsType)
		return NULL;

	SuperBlock *super = kmalloc(sizeof(SuperBlock));

	super->type = type;
	super->ops = &procfsSuperOps;
	init_lock(&super->lock);

	Inode *inode = &procfsRoot;
	inode->nlink++;
	inode->super = super;
	/* FIXME: need an inode per super, or only one super */
	super->root = inode;
	/* Never free */
	if (!inode->usage)
		inode_get(inode);

	return inode;
}

/* Allocate an inode */
Inode *
procfs_alloc_inode(SuperBlock *sb)
{
	Inode *inode = kmalloc(sizeof(Inode));
	init_lock(&inode->lock);
	inode->ops = &procfsInodeOps;
	inode->fileOps = &procfsFileOps;
	inode->super = sb;
	inode->nlink = 1;
	return inode_get(inode); /* This ensures that the inode is never free */
}