LXR linux/fs/squashfs/file

   1/*
   2 * Copyright (c) 2013
   3 * Phillip Lougher <phillip@squashfs.org.uk>
   4 *
   5 * This work is licensed under the terms of the GNU GPL, version 2. See
   6 * the COPYING file in the top-level directory.
   7 */
   8
   9#include <linux/fs.h>
  10#include <linux/vfs.h>
  11#include <linux/kernel.h>
  12#include <linux/slab.h>
  13#include <linux/string.h>
  14#include <linux/pagemap.h>
  15#include <linux/mutex.h>
  16
  17#include "squashfs_fs.h"
  18#include "squashfs_fs_sb.h"
  19#include "squashfs_fs_i.h"
  20#include "squashfs.h"
  21
  22/* Read separately compressed datablock and memcopy into page cache */
  23int squashfs_readpage_block(struct page *page, u64 block, int bsize)
  24{
  25        struct inode *i = page->mapping->host;
  26        struct squashfs_cache_entry *buffer = squashfs_get_datablock(i->i_sb,
  27                block, bsize);
  28        int res = buffer->error;
  29
  30        if (res)
  31                ERROR("Unable to read page, block %llx, size %x\n", block,
  32                        bsize);
  33        else
  34                squashfs_copy_cache(page, buffer, buffer->length, 0);
  35
  36        squashfs_cache_put(buffer);
  37        return res;
  38}
  39