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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>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef PAGE_ACTOR_H
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#define PAGE_ACTOR_H
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/*
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* Copyright (c) 2013
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* Phillip Lougher <phillip@squashfs.org.uk>
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*/
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struct squashfs_page_actor {
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union {
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void **buffer;
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struct page **page;
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};
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void *pageaddr;
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void *tmp_buffer;
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void *(*squashfs_first_page)(struct squashfs_page_actor *);
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void *(*squashfs_next_page)(struct squashfs_page_actor *);
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void (*squashfs_finish_page)(struct squashfs_page_actor *);
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struct page *last_page;
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int pages;
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int length;
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int next_page;
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int alloc_buffer;
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int returned_pages;
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pgoff_t next_index;
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};
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extern struct squashfs_page_actor *squashfs_page_actor_init(void **buffer,
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int pages, int length);
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extern struct squashfs_page_actor *squashfs_page_actor_init_special(
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struct squashfs_sb_info *msblk,
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struct page **page, int pages, int length,
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loff_t start_index);
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static inline struct page *squashfs_page_actor_free(struct squashfs_page_actor *actor)
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{
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struct page *last_page = actor->next_page == actor->pages ? actor->last_page : ERR_PTR(-EIO);
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kfree(actor->tmp_buffer);
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kfree(actor);
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return last_page;
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}
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static inline void *squashfs_first_page(struct squashfs_page_actor *actor)
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{
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return actor->squashfs_first_page(actor);
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}
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static inline void *squashfs_next_page(struct squashfs_page_actor *actor)
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{
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return actor->squashfs_next_page(actor);
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}
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static inline void squashfs_finish_page(struct squashfs_page_actor *actor)
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{
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actor->squashfs_finish_page(actor);
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}
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static inline void squashfs_actor_nobuff(struct squashfs_page_actor *actor)
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{
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actor->alloc_buffer = 0;
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}
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#endif
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