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 */ 23 int squashfs_readpage_block(struct page *page, u64 block, int bsize, int expected) 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, expected, 0); 35 36 squashfs_cache_put(buffer); 37 return res; 38 } 39