| 1 | /*
|
|---|
| 2 | * ind_block.c --- indirect block I/O routines
|
|---|
| 3 | *
|
|---|
| 4 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
|
|---|
| 5 | * 2001, 2002, 2003, 2004, 2005 by Theodore Ts'o.
|
|---|
| 6 | *
|
|---|
| 7 | * %Begin-Header%
|
|---|
| 8 | * This file may be redistributed under the terms of the GNU Public
|
|---|
| 9 | * License.
|
|---|
| 10 | * %End-Header%
|
|---|
| 11 | */
|
|---|
| 12 |
|
|---|
| 13 | #include <stdio.h>
|
|---|
| 14 | #include <string.h>
|
|---|
| 15 | #if HAVE_UNISTD_H
|
|---|
| 16 | #include <unistd.h>
|
|---|
| 17 | #endif
|
|---|
| 18 |
|
|---|
| 19 | #include "ext2_fs.h"
|
|---|
| 20 | #include "ext2fs.h"
|
|---|
| 21 |
|
|---|
| 22 | errcode_t ext2fs_read_ind_block(ext2_filsys fs, blk_t blk, void *buf)
|
|---|
| 23 | {
|
|---|
| 24 | errcode_t retval;
|
|---|
| 25 | #if BB_BIG_ENDIAN
|
|---|
| 26 | blk_t *block_nr;
|
|---|
| 27 | int i;
|
|---|
| 28 | int limit = fs->blocksize >> 2;
|
|---|
| 29 | #endif
|
|---|
| 30 |
|
|---|
| 31 | if ((fs->flags & EXT2_FLAG_IMAGE_FILE) &&
|
|---|
| 32 | (fs->io != fs->image_io))
|
|---|
| 33 | memset(buf, 0, fs->blocksize);
|
|---|
| 34 | else {
|
|---|
| 35 | retval = io_channel_read_blk(fs->io, blk, 1, buf);
|
|---|
| 36 | if (retval)
|
|---|
| 37 | return retval;
|
|---|
| 38 | }
|
|---|
| 39 | #if BB_BIG_ENDIAN
|
|---|
| 40 | if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_READ)) {
|
|---|
| 41 | block_nr = (blk_t *) buf;
|
|---|
| 42 | for (i = 0; i < limit; i++, block_nr++)
|
|---|
| 43 | *block_nr = ext2fs_swab32(*block_nr);
|
|---|
| 44 | }
|
|---|
| 45 | #endif
|
|---|
| 46 | return 0;
|
|---|
| 47 | }
|
|---|
| 48 |
|
|---|
| 49 | errcode_t ext2fs_write_ind_block(ext2_filsys fs, blk_t blk, void *buf)
|
|---|
| 50 | {
|
|---|
| 51 | #if BB_BIG_ENDIAN
|
|---|
| 52 | blk_t *block_nr;
|
|---|
| 53 | int i;
|
|---|
| 54 | int limit = fs->blocksize >> 2;
|
|---|
| 55 | #endif
|
|---|
| 56 |
|
|---|
| 57 | if (fs->flags & EXT2_FLAG_IMAGE_FILE)
|
|---|
| 58 | return 0;
|
|---|
| 59 |
|
|---|
| 60 | #if BB_BIG_ENDIAN
|
|---|
| 61 | if (fs->flags & (EXT2_FLAG_SWAP_BYTES | EXT2_FLAG_SWAP_BYTES_WRITE)) {
|
|---|
| 62 | block_nr = (blk_t *) buf;
|
|---|
| 63 | for (i = 0; i < limit; i++, block_nr++)
|
|---|
| 64 | *block_nr = ext2fs_swab32(*block_nr);
|
|---|
| 65 | }
|
|---|
| 66 | #endif
|
|---|
| 67 | return io_channel_write_blk(fs->io, blk, 1, buf);
|
|---|
| 68 | }
|
|---|
| 69 |
|
|---|
| 70 |
|
|---|
