// SPDX-License-Identifier: GPL-2.0-only/* * VMware VMCI Driver * * Copyright (C) 2012 VMware, Inc. All rights reserved. */ #include <linux/slab.h>#include "vmci_handle_array.h" struct vmci_handle_arr *vmci_handle_arr_create(u32 capacity, u32 max_capacity){	struct vmci_handle_arr *array; 	if (max_capacity == 0 || capacity > max_capacity)		return NULL; 	if (capacity == 0)		capacity = min((u32)VMCI_HANDLE_ARRAY_DEFAULT_CAPACITY,			       max_capacity); 	array = kmalloc_flex(*array, entries, capacity, GFP_ATOMIC);	if (!array)		return NULL; 	array->capacity = capacity;	array->max_capacity = max_capacity;	array->size = 0; 	return array;} void vmci_handle_arr_destroy(struct vmci_handle_arr *array){	kfree(array);} int vmci_handle_arr_append_entry(struct vmci_handle_arr **array_ptr,				 struct vmci_handle handle){	struct vmci_handle_arr *array = *array_ptr; 	if (unlikely(array->size >= array->capacity)) {		/* reallocate. */		struct vmci_handle_arr *new_array;		u32 capacity_bump = min(array->max_capacity - array->capacity,					array->capacity);		size_t new_size = struct_size(array, entries,					      size_add(array->capacity, capacity_bump)); 		if (array->size >= array->max_capacity)			return VMCI_ERROR_NO_MEM; 		new_array = krealloc(array, new_size, GFP_ATOMIC);		if (!new_array)			return VMCI_ERROR_NO_MEM; 		new_array->capacity += capacity_bump;		*array_ptr = array = new_array;	} 	array->entries[array->size] = handle;	array->size++; 	return VMCI_SUCCESS;} /* * Handle that was removed, VMCI_INVALID_HANDLE if entry not found. */struct vmci_handle vmci_handle_arr_remove_entry(struct vmci_handle_arr *array,						struct vmci_handle entry_handle){	struct vmci_handle handle = VMCI_INVALID_HANDLE;	u32 i; 	for (i = 0; i < array->size; i++) {		if (vmci_handle_is_equal(array->entries[i], entry_handle)) {			handle = array->entries[i];			array->size--;			array->entries[i] = array->entries[array->size];			array->entries[array->size] = VMCI_INVALID_HANDLE;			break;		}	} 	return handle;} /* * Handle that was removed, VMCI_INVALID_HANDLE if array was empty. */struct vmci_handle vmci_handle_arr_remove_tail(struct vmci_handle_arr *array){	struct vmci_handle handle = VMCI_INVALID_HANDLE; 	if (array->size) {		array->size--;		handle = array->entries[array->size];		array->entries[array->size] = VMCI_INVALID_HANDLE;	} 	return handle;} /* * Handle at given index, VMCI_INVALID_HANDLE if invalid index. */struct vmci_handlevmci_handle_arr_get_entry(const struct vmci_handle_arr *array, u32 index){	if (unlikely(index >= array->size))		return VMCI_INVALID_HANDLE; 	return array->entries[index];} bool vmci_handle_arr_has_entry(const struct vmci_handle_arr *array,			       struct vmci_handle entry_handle){	u32 i; 	for (i = 0; i < array->size; i++)		if (vmci_handle_is_equal(array->entries[i], entry_handle))			return true; 	return false;} /* * NULL if the array is empty. Otherwise, a pointer to the array * of VMCI handles in the handle array. */struct vmci_handle *vmci_handle_arr_get_handles(struct vmci_handle_arr *array){	if (array->size)		return array->entries; 	return NULL;}