2 * ind_block.c --- indirect block I/O routines
4 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
5 * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o.
8 * This file may be redistributed under the terms of the GNU Public
22 errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)
27 int limit = fs->blocksize >> 2;
29 if ((fs->flags & EXT2_FLAG_IMAGE_FILE) &&
30 (fs->io != fs->image_io))
31 memset(buf, 0, fs->blocksize);
33 retval = io_channel_read_blk(fs->io, blk, 1, buf);
37 #ifdef EXT2FS_ENABLE_SWAPFS
38 if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
39 block_nr = (blk_t *) buf;
40 for (i = 0; i < limit; i++, block_nr++)
41 *block_nr = ext2fs_swab32(*block_nr);
47 errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)
51 int limit = fs->blocksize >> 2;
53 if (fs->flags & EXT2_FLAG_IMAGE_FILE)
56 #ifdef EXT2FS_ENABLE_SWAPFS
57 if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
58 block_nr = (blk_t *) buf;
59 for (i = 0; i < limit; i++, block_nr++)
60 *block_nr = ext2fs_swab32(*block_nr);
63 return io_channel_write_blk(fs->io, blk, 1, buf);