Orion

/*
 * This file controls the superblock for TmpFS.  It supports mounting new TmpFS
 * 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 *tmpfs_mount(FileSystemType *type, int flags,
                   const char *dev, void *data);
Inode *tmpfs_alloc_inode(SuperBlock *sb);

FileSystemType tmpfsType = {
	.name    = "TmpFS",
	.mount   = tmpfs_mount,
//	.kill_sb = tmpfs_kill_sb,
};

SuperOps tmpfsSuperOps = {
	.alloc_inode  = tmpfs_alloc_inode,
//	.free_inode   = tmpfs_free_inode,
//	.write_inode  = tmpfs_write_inode,
//	.delete_inode = tmpfs_delete_inode,
};

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

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

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

	Inode *inode = super_alloc_inode(super);
	inode->mode = S_IFDIR | 0755;
	super->root = inode;

	return inode;
}

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