root/Whitix/trunk/lib/keobject.c

/*  This file is part of Whitix.
 *
 *  Whitix is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Whitix is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Whitix; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <error.h>
#include <fs/kfs.h>
#include <string.h>
#include <keobject.h>
#include <malloc.h>
#include <module.h>
#include <panic.h>
#include <print.h>
#include <fs/devfs.h>
#include <fs/icfs.h>

void KeObjectInit(struct KeObject* object, struct KeSet* parent)
{
        object->refs = 1;
        object->dir = NULL;
        object->parent = parent;
}

SYMBOL_EXPORT(KeObjectInit);

void KeObjectDetach(struct KeObject* object)
{
        if (object->dir)
                IcFsRemoveDir(object->dir);
        
        if (object->parent)
                ListRemove(&object->next);
                
        MemFree(object->name);
}

SYMBOL_EXPORT(KeObjectDetach);

void KeObjectFree(struct KeObject* object)
{
        struct KeSet* parent = object->parent;
        
        KeObjectDetach(object);

        if (parent && parent->type && parent->type->release)
                parent->type->release(object);
        else
                KernelPanic("No type to free from\n");
}

SYMBOL_EXPORT(KeObjectFree);

int KeObjectAttach(struct KeObject* object, const char* name, ...)
{
        VaList vaList;
        int err;
        
        VaStart(vaList, name);
        
        err = KeObjectVaAttach(object, name, vaList);
        
        VaEnd(vaList);
        
        return err;
}

int KeObjectVaAttach(struct KeObject* object, const char* name, VaList vaList)
{
        if (!object)
                return -EFAULT;
                
        /* If the pointer to the IcFs entry is already set, we've already bound 
         * this object to the filesystem.
         */
        if (object->dir)
                return -EEXIST;

        object->name = vasprintf(name, vaList);
        
        if (!object->name)
                return -EFAULT;
        
        /* Is there already an object in the set with the same name? */
        if (object->parent && KeSetFind(object->parent, object->name))
                return -EEXIST;
                
        /* Create a directory in IcFs, using the object's parent directory as the
         * parent directory.
         */
         
         object->dir=IcFsCreateDir(KeObjGetParentDir(object), object->name);
         
         if (!object->dir)
                return -EIO;
         
         /* Add the new object to the parent's list of KeObjects. */
         KeSetAdd(object->parent, object);
         
         return 0;
}

int KeObjUnbindFs(struct KeObject* object)
{
        /* TODO */
        return 0;
}

struct KeObject* KeSetFind(struct KeSet* set, const char* name)
{
        struct KeObject* curr;
        static int i = 0;
        
        SpinLock(&set->lock);
        
        ListForEachEntry(curr, &set->head, next)
        {
                const char* objName = KeObjGetName(curr);
                
                if (!objName)
                        continue;
                        
                if (!strcmp(name, objName))
                        goto out;
        }
        
        curr = NULL;

out:
        SpinUnlock(&set->lock);
        return curr;
}

void KeSetInit(struct KeSet* set, struct KeSet* parent, struct KeObjType* type)
{
        INIT_LIST_HEAD(&set->head);
        KeObjectInit(&set->object, parent);
        
        set->devDir = NULL;
        set->type = type;
}

SYMBOL_EXPORT(KeSetInit);

int KeSetAttach(struct KeSet* set, const char* name, ...)
{
        if (!set)
                return -EFAULT;
                
        return KeObjectAttach(&set->object, name);
}

SYMBOL_EXPORT(KeSetAttach);