81 lines
2 KiB
C
81 lines
2 KiB
C
#ifndef PAGE_ACTOR_H
|
|
#define PAGE_ACTOR_H
|
|
/*
|
|
* Copyright (c) 2013
|
|
* Phillip Lougher <phillip@squashfs.org.uk>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#ifndef CONFIG_SQUASHFS_FILE_DIRECT
|
|
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;
|
|
|
|
actor->length = length ? : pages * PAGE_CACHE_SIZE;
|
|
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 */
|
|
}
|
|
#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
|
|
#endif
|