/* * ind_block.c --- indirect block I/O routines * * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public * License. * %End-Header% */ #include <stdio.h> #include <string.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include "ext2_fs.h" #include "ext2fs.h" errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf) { errcode_t retval; #ifdef EXT2FS_ENABLE_SWAPFS blk_t *block_nr; int i; int limit = fs->blocksize >> 2; #endif if ((fs->flags & EXT2_FLAG_IMAGE_FILE) && (fs->io != fs->image_io)) memset(buf, 0, fs->blocksize); else { retval = io_channel_read_blk(fs->io, blk, 1, buf); if (retval) return retval; } #ifdef EXT2FS_ENABLE_SWAPFS if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) { block_nr = (blk_t *) buf; for (i = 0; i < limit; i++, block_nr++) *block_nr = ext2fs_swab32(*block_nr); } #endif return 0; } errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf) { #ifdef EXT2FS_ENABLE_SWAPFS blk_t *block_nr; int i; int limit = fs->blocksize >> 2; #endif if (fs->flags & EXT2_FLAG_IMAGE_FILE) return 0; #ifdef EXT2FS_ENABLE_SWAPFS if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) { block_nr = (blk_t *) buf; for (i = 0; i < limit; i++, block_nr++) *block_nr = ext2fs_swab32(*block_nr); } #endif return io_channel_write_blk(fs->io, blk, 1, buf); }