| /* vi: set sw=4 ts=4: */ |
| /* |
| * 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; |
| #if BB_BIG_ENDIAN |
| 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; |
| } |
| #if BB_BIG_ENDIAN |
| 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) |
| { |
| #if BB_BIG_ENDIAN |
| blk_t *block_nr; |
| int i; |
| int limit = fs->blocksize >> 2; |
| #endif |
| |
| if (fs->flags & EXT2_FLAG_IMAGE_FILE) |
| return 0; |
| |
| #if BB_BIG_ENDIAN |
| 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); |
| } |
