filesystems: fix checks for file existance

src/fs/devfs.c

@@ -98,6 +98,9 @@ void devfs_init(){
 
 int devfs_newdevice(char* name, int type, dev_t dev, mode_t mode){
 	
+	if(hashtable_get(&devnodes, name))
+		return EEXIST;
+
 	vnode_t* node = vfs_newnode(name, fs, 0);
 	if(!node)
 		return ENOMEM;
@@ -106,7 +109,7 @@ int devfs_newdevice(char* name, int type, dev_t dev, mode_t mode){
 		vfs_destroynode(node);
 		return ENOMEM;
 	}
-	
+
 	node->st.st_rdev = dev;
 	node->st.st_mode = MAKETYPE(type) | mode;
 	node->st.st_ino  = fs->data;

src/fs/vfs.c

@@ -239,15 +239,16 @@ int vfs_create(dirnode_t* ref, char* path, mode_t mode){
 
 	int result = vfs_resolvepath(&buff, &parent, ref, path, name);
 
+	if(buff){
+		spinlock_release(&lock);
+		return EEXIST;
+	}
+
 	if(!parent){
 		spinlock_release(&lock);
 		return result;
 	}
 
-	if(buff){
-		spinlock_release(&lock);
-		return EEXIST;
-	}
 	result = parent->vnode.fs->calls->create(parent, name, mode);
 	
 	spinlock_release(&lock);
@@ -268,14 +269,16 @@ int vfs_mkdir(dirnode_t* ref, char* path, mode_t mode){
 
 	int result = vfs_resolvepath(&buff, &parent, ref, path, name);
 
-	if(!parent){
-		spinlock_release(&lock);
-		return result;
-	}
 	if(buff){
 		spinlock_release(&lock);
 		return EEXIST;
 	}
+
+	if(!parent){
+		spinlock_release(&lock);
+		return result;
+	}
+
 	
 	result = parent->vnode.fs->calls->mkdir(parent, name, mode);