LXR linux/fs/squashfs/file

   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