1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* unlink.c --- delete links in a ext2fs directory
*
* Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ext2_fs.h"
#include "ext2fs.h"
struct link_struct {
const char *name;
int namelen;
ext2_ino_t inode;
int flags;
struct ext2_dir_entry *prev;
int done;
};
#ifdef __TURBOC__
#pragma argsused
#endif
static int unlink_proc(struct ext2_dir_entry *dirent,
int offset,
int blocksize EXT2FS_ATTR((unused)),
char *buf EXT2FS_ATTR((unused)),
void *priv_data)
{
struct link_struct *ls = (struct link_struct *) priv_data;
struct ext2_dir_entry *prev;
prev = ls->prev;
ls->prev = dirent;
if (ls->name) {
if (ext2fs_dirent_name_len(dirent) != ls->namelen)
return 0;
if (strncmp(ls->name, dirent->name, ext2fs_dirent_name_len(dirent)))
return 0;
}
if (!(ls->flags & EXT2FS_UNLINK_FORCE) && ls->inode) {
if (dirent->inode != ls->inode)
return 0;
} else {
if (!dirent->inode)
return 0;
}
if (offset)
prev->rec_len += dirent->rec_len;
else
dirent->inode = 0;
ls->done++;
return DIRENT_ABORT|DIRENT_CHANGED;
}
#ifdef __TURBOC__
#pragma argsused
#endif
errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
const char *name, ext2_ino_t ino,
int flags)
{
errcode_t retval;
struct link_struct ls;
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (!name && !ino)
return EXT2_ET_INVALID_ARGUMENT;
if (!(fs->flags & EXT2_FLAG_RW))
return EXT2_ET_RO_FILSYS;
ls.name = name;
ls.namelen = name ? strlen(name) : 0;
ls.inode = ino;
ls.flags = flags;
ls.done = 0;
ls.prev = 0;
retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
0, unlink_proc, &ls);
if (retval)
return retval;
return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
}
|
