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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2024 Intel Corporation
*/
#ifndef _TTM_BACKUP_H_
#define _TTM_BACKUP_H_
#include <linux/mm_types.h>
#include <linux/shmem_fs.h>
/**
* ttm_backup_handle_to_page_ptr() - Convert handle to struct page pointer
* @handle: The handle to convert.
*
* Converts an opaque handle received from the
* ttm_backup_backup_page() function to an (invalid)
* struct page pointer suitable for a struct page array.
*
* Return: An (invalid) struct page pointer.
*/
static inline struct page *
ttm_backup_handle_to_page_ptr(unsigned long handle)
{
return (struct page *)(handle << 1 | 1);
}
/**
* ttm_backup_page_ptr_is_handle() - Whether a struct page pointer is a handle
* @page: The struct page pointer to check.
*
* Return: true if the struct page pointer is a handld returned from
* ttm_backup_handle_to_page_ptr(). False otherwise.
*/
static inline bool ttm_backup_page_ptr_is_handle(const struct page *page)
{
return (unsigned long)page & 1;
}
/**
* ttm_backup_page_ptr_to_handle() - Convert a struct page pointer to a handle
* @page: The struct page pointer to convert
*
* Return: The handle that was previously used in
* ttm_backup_handle_to_page_ptr() to obtain a struct page pointer, suitable
* for use as argument in the struct ttm_backup_drop() or
* ttm_backup_copy_page() functions.
*/
static inline unsigned long
ttm_backup_page_ptr_to_handle(const struct page *page)
{
WARN_ON(!ttm_backup_page_ptr_is_handle(page));
return (unsigned long)page >> 1;
}
void ttm_backup_drop(struct file *backup, pgoff_t handle);
int ttm_backup_copy_page(struct file *backup, struct page *dst,
pgoff_t handle, bool intr);
s64
ttm_backup_backup_page(struct file *backup, struct page *page,
bool writeback, pgoff_t idx, gfp_t page_gfp,
gfp_t alloc_gfp);
void ttm_backup_fini(struct file *backup);
u64 ttm_backup_bytes_avail(void);
struct file *ttm_backup_shmem_create(loff_t size);
#endif
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