vasilito
facf0c92e0
Red Bear OS is a full fork. All sources must be available from git clone with zero network access. Removed gitignore rules that excluded fetched source trees under recipes/*/source/, local/recipes/kde/*/source/, local/recipes/qt/*/source/, and vendor source trees. Build artifacts (target/, build/, source.tar, *.o, *.so) remain excluded. 127291 files added — kernel, relibc, base, bootloader, pkgar, all KDE/Qt frameworks, mesa, wayland, DRM drivers, and every other recipe source.
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#ifndef _TTM_BACKUP_H_
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#define _TTM_BACKUP_H_
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#include <linux/mm_types.h>
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#include <linux/shmem_fs.h>
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/**
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* ttm_backup_handle_to_page_ptr() - Convert handle to struct page pointer
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* @handle: The handle to convert.
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*
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* Converts an opaque handle received from the
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* ttm_backup_backup_page() function to an (invalid)
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* struct page pointer suitable for a struct page array.
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*
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* Return: An (invalid) struct page pointer.
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*/
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static inline struct page *
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ttm_backup_handle_to_page_ptr(unsigned long handle)
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{
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return (struct page *)(handle << 1 | 1);
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}
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/**
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* ttm_backup_page_ptr_is_handle() - Whether a struct page pointer is a handle
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* @page: The struct page pointer to check.
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*
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* Return: true if the struct page pointer is a handld returned from
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* ttm_backup_handle_to_page_ptr(). False otherwise.
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*/
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static inline bool ttm_backup_page_ptr_is_handle(const struct page *page)
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{
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return (unsigned long)page & 1;
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}
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/**
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* ttm_backup_page_ptr_to_handle() - Convert a struct page pointer to a handle
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* @page: The struct page pointer to convert
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*
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* Return: The handle that was previously used in
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* ttm_backup_handle_to_page_ptr() to obtain a struct page pointer, suitable
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* for use as argument in the struct ttm_backup_drop() or
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* ttm_backup_copy_page() functions.
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*/
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static inline unsigned long
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ttm_backup_page_ptr_to_handle(const struct page *page)
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{
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WARN_ON(!ttm_backup_page_ptr_is_handle(page));
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return (unsigned long)page >> 1;
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}
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void ttm_backup_drop(struct file *backup, pgoff_t handle);
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int ttm_backup_copy_page(struct file *backup, struct page *dst,
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pgoff_t handle, bool intr);
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s64
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ttm_backup_backup_page(struct file *backup, struct page *page,
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bool writeback, pgoff_t idx, gfp_t page_gfp,
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gfp_t alloc_gfp);
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void ttm_backup_fini(struct file *backup);
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u64 ttm_backup_bytes_avail(void);
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struct file *ttm_backup_shmem_create(loff_t size);
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#endif
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