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