1 /*
2 * dirblock.c --- directory block routines.
3 *
4 * Copyright (C) 1995, 1996 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12 #include "config.h"
13 #include <stdio.h>
14 #if HAVE_UNISTD_H
15 #include <unistd.h>
16 #endif
17 #include <string.h>
18 #include <time.h>
19
20 #include "ext2_fs.h"
21 #include "ext2fs.h"
22
ext2fs_read_dir_block4(ext2_filsys fs,blk64_t block,void * buf,int flags EXT2FS_ATTR ((unused)),ext2_ino_t ino)23 errcode_t ext2fs_read_dir_block4(ext2_filsys fs, blk64_t block,
24 void *buf, int flags EXT2FS_ATTR((unused)),
25 ext2_ino_t ino)
26 {
27 errcode_t retval;
28 int corrupt = 0;
29
30 retval = io_channel_read_blk64(fs->io, block, 1, buf);
31 if (retval)
32 return retval;
33
34 if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
35 !ext2fs_dir_block_csum_verify(fs, ino,
36 (struct ext2_dir_entry *)buf))
37 corrupt = 1;
38
39 #ifdef WORDS_BIGENDIAN
40 retval = ext2fs_dirent_swab_in(fs, buf, flags);
41 #endif
42 if (!retval && corrupt)
43 retval = EXT2_ET_DIR_CSUM_INVALID;
44 return retval;
45 }
46
ext2fs_read_dir_block3(ext2_filsys fs,blk64_t block,void * buf,int flags EXT2FS_ATTR ((unused)))47 errcode_t ext2fs_read_dir_block3(ext2_filsys fs, blk64_t block,
48 void *buf, int flags EXT2FS_ATTR((unused)))
49 {
50 return ext2fs_read_dir_block4(fs, block, buf, flags, 0);
51 }
52
ext2fs_read_dir_block2(ext2_filsys fs,blk_t block,void * buf,int flags EXT2FS_ATTR ((unused)))53 errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block,
54 void *buf, int flags EXT2FS_ATTR((unused)))
55 {
56 return ext2fs_read_dir_block3(fs, block, buf, flags);
57 }
58
ext2fs_read_dir_block(ext2_filsys fs,blk_t block,void * buf)59 errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block,
60 void *buf)
61 {
62 return ext2fs_read_dir_block3(fs, block, buf, 0);
63 }
64
65
ext2fs_write_dir_block4(ext2_filsys fs,blk64_t block,void * inbuf,int flags EXT2FS_ATTR ((unused)),ext2_ino_t ino)66 errcode_t ext2fs_write_dir_block4(ext2_filsys fs, blk64_t block,
67 void *inbuf, int flags EXT2FS_ATTR((unused)),
68 ext2_ino_t ino)
69 {
70 errcode_t retval;
71 char *buf = inbuf;
72
73 #ifdef WORDS_BIGENDIAN
74 retval = ext2fs_get_mem(fs->blocksize, &buf);
75 if (retval)
76 return retval;
77 memcpy(buf, inbuf, fs->blocksize);
78 retval = ext2fs_dirent_swab_out(fs, buf, flags);
79 if (retval)
80 return retval;
81 #endif
82 retval = ext2fs_dir_block_csum_set(fs, ino,
83 (struct ext2_dir_entry *)buf);
84 if (retval)
85 goto out;
86
87 retval = io_channel_write_blk64(fs->io, block, 1, buf);
88
89 out:
90 #ifdef WORDS_BIGENDIAN
91 ext2fs_free_mem(&buf);
92 #endif
93 return retval;
94 }
95
ext2fs_write_dir_block3(ext2_filsys fs,blk64_t block,void * inbuf,int flags EXT2FS_ATTR ((unused)))96 errcode_t ext2fs_write_dir_block3(ext2_filsys fs, blk64_t block,
97 void *inbuf, int flags EXT2FS_ATTR((unused)))
98 {
99 return ext2fs_write_dir_block4(fs, block, inbuf, flags, 0);
100 }
101
ext2fs_write_dir_block2(ext2_filsys fs,blk_t block,void * inbuf,int flags EXT2FS_ATTR ((unused)))102 errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block,
103 void *inbuf, int flags EXT2FS_ATTR((unused)))
104 {
105 return ext2fs_write_dir_block3(fs, block, inbuf, flags);
106 }
107
ext2fs_write_dir_block(ext2_filsys fs,blk_t block,void * inbuf)108 errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block,
109 void *inbuf)
110 {
111 return ext2fs_write_dir_block3(fs, block, inbuf, 0);
112 }
113
114