• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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