1 /* vi: set sw=4 ts=4: */
3 * ind_block.c --- indirect block I/O routines
5 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
6 * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o.
9 * This file may be redistributed under the terms of the GNU Public
23 errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)
29 int limit = fs->blocksize >> 2;
32 if ((fs->flags & EXT2_FLAG_IMAGE_FILE) &&
33 (fs->io != fs->image_io))
34 memset(buf, 0, fs->blocksize);
36 retval = io_channel_read_blk(fs->io, blk, 1, buf);
41 if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
42 block_nr = (blk_t *) buf;
43 for (i = 0; i < limit; i++, block_nr++)
44 *block_nr = ext2fs_swab32(*block_nr);
50 errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)
55 int limit = fs->blocksize >> 2;
58 if (fs->flags & EXT2_FLAG_IMAGE_FILE)
62 if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
63 block_nr = (blk_t *) buf;
64 for (i = 0; i < limit; i++, block_nr++)
65 *block_nr = ext2fs_swab32(*block_nr);
68 return io_channel_write_blk(fs->io, blk, 1, buf);