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fs/squashfs/page_actor.h 1.87 KB
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20c8ccb19   Thomas Gleixner   treewide: Replace... 
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  /* SPDX-License-Identifier: GPL-2.0-only */
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  #ifndef PAGE_ACTOR_H
  #define PAGE_ACTOR_H
  /*
   * Copyright (c) 2013
   * Phillip Lougher <phillip@squashfs.org.uk>
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   */
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  #ifndef CONFIG_SQUASHFS_FILE_DIRECT
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  struct squashfs_page_actor {
  	void	**page;
  	int	pages;
  	int	length;
  	int	next_page;
  };
  
  static inline struct squashfs_page_actor *squashfs_page_actor_init(void **page,
  	int pages, int length)
  {
  	struct squashfs_page_actor *actor = kmalloc(sizeof(*actor), GFP_KERNEL);
  
  	if (actor == NULL)
  		return NULL;
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  	actor->length = length ? : pages * PAGE_SIZE;
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  	actor->page = page;
  	actor->pages = pages;
  	actor->next_page = 0;
  	return actor;
  }
  
  static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
  {
  	actor->next_page = 1;
  	return actor->page[0];
  }
  
  static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
  {
  	return actor->next_page == actor->pages ? NULL :
  		actor->page[actor->next_page++];
  }
  
  static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
  {
  	/* empty */
  }
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  #else
  struct squashfs_page_actor {
  	union {
  		void		**buffer;
  		struct page	**page;
  	};
  	void	*pageaddr;
  	void    *(*squashfs_first_page)(struct squashfs_page_actor *);
  	void    *(*squashfs_next_page)(struct squashfs_page_actor *);
  	void    (*squashfs_finish_page)(struct squashfs_page_actor *);
  	int	pages;
  	int	length;
  	int	next_page;
  };
  
  extern struct squashfs_page_actor *squashfs_page_actor_init(void **, int, int);
  extern struct squashfs_page_actor *squashfs_page_actor_init_special(struct page
  							 **, int, int);
  static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
  {
  	return actor->squashfs_first_page(actor);
  }
  static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
  {
  	return actor->squashfs_next_page(actor);
  }
  static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
  {
  	actor->squashfs_finish_page(actor);
  }
  #endif
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  #endif