1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2013
4 * Phillip Lougher <phillip@squashfs.org.uk>
5 */
6
7#include <linux/fs.h>
8#include <linux/vfs.h>
9#include <linux/kernel.h>
10#include <linux/slab.h>
11#include <linux/string.h>
12#include <linux/pagemap.h>
13#include <linux/mutex.h>
14
15#include "squashfs_fs.h"
16#include "squashfs_fs_sb.h"
17#include "squashfs_fs_i.h"
18#include "squashfs.h"
19
20/* Read separately compressed datablock and memcopy into page cache */
21int squashfs_readpage_block(struct page *page, u64 block, int bsize, int expected)
22{
23	struct inode *i = page->mapping->host;
24	struct squashfs_cache_entry *buffer = squashfs_get_datablock(i->i_sb,
25		block, bsize);
26	int res = buffer->error;
27
28	if (res)
29		ERROR("Unable to read page, block %llx, size %x\n", block,
30			bsize);
31	else
32		squashfs_copy_cache(page, buffer, expected, 0);
33
34	squashfs_cache_put(buffer);
35	return res;
36}
37