linux/fs/squashfs/page_actor.h
Thomas Gleixner 20c8ccb197 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499
Based on 1 normalized pattern(s):

  this work is licensed under the terms of the gnu gpl version 2 see
  the copying file in the top level directory

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 35 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.797835076@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:53 +02:00

80 lines
1.9 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef PAGE_ACTOR_H
#define PAGE_ACTOR_H
/*
* Copyright (c) 2013
* Phillip Lougher <phillip@squashfs.org.uk>
*/
#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_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