mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-09-21 12:11:49 +08:00
84e0e03b30
In the recent work to remove page->index, a sanity check that ensured all the readhead pages were covered by the Squashfs data block was removed [1]. To avoid any regression, this commit adds the sanity check back in an equivalent way. Namely the page actor will now return error if any pages are unused after completion. [1] https://lore.kernel.org/all/20240818235847.170468-3-phillip@squashfs.org.uk/ -- Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Link: https://lore.kernel.org/r/20240822233106.121522-1-phillip@squashfs.org.uk V3: last_page should be actor->last_page Signed-off-by: Christian Brauner <brauner@kernel.org>
60 lines
1.6 KiB
C
60 lines
1.6 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>
|
|
*/
|
|
|
|
struct squashfs_page_actor {
|
|
union {
|
|
void **buffer;
|
|
struct page **page;
|
|
};
|
|
void *pageaddr;
|
|
void *tmp_buffer;
|
|
void *(*squashfs_first_page)(struct squashfs_page_actor *);
|
|
void *(*squashfs_next_page)(struct squashfs_page_actor *);
|
|
void (*squashfs_finish_page)(struct squashfs_page_actor *);
|
|
struct page *last_page;
|
|
int pages;
|
|
int length;
|
|
int next_page;
|
|
int alloc_buffer;
|
|
int returned_pages;
|
|
pgoff_t next_index;
|
|
};
|
|
|
|
extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
|
|
int pages, int length);
|
|
extern struct squashfs_page_actor *squashfs_page_actor_init_special(
|
|
struct squashfs_sb_info *msblk,
|
|
struct page **page, int pages, int length,
|
|
loff_t start_index);
|
|
static inline struct page *squashfs_page_actor_free(struct squashfs_page_actor *actor)
|
|
{
|
|
struct page *last_page = actor->next_page == actor->pages ? actor->last_page : ERR_PTR(-EIO);
|
|
|
|
kfree(actor->tmp_buffer);
|
|
kfree(actor);
|
|
|
|
return last_page;
|
|
}
|
|
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);
|
|
}
|
|
static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
|
|
{
|
|
actor->alloc_buffer = 0;
|
|
}
|
|
#endif
|