37 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 20134 * 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 else32 squashfs_copy_cache(page, buffer, expected, 0);33 34 squashfs_cache_put(buffer);35 return res;36}37