blob: 9c55423203e799d92b8e6f4d50a0bd70dedc8866 [file] [log] [blame]
Theodore Ts'o19c78dc1997-04-29 16:17:09 +00001/*
2 * unlink.c --- delete links in a ext2fs directory
3 *
4 * Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <string.h>
Theodore Ts'o4cbe8af1997-08-10 23:07:40 +000014#if HAVE_UNISTD_H
Theodore Ts'o19c78dc1997-04-29 16:17:09 +000015#include <unistd.h>
Theodore Ts'o4cbe8af1997-08-10 23:07:40 +000016#endif
Theodore Ts'o19c78dc1997-04-29 16:17:09 +000017#include <stdlib.h>
18
19#include <linux/ext2_fs.h>
20
21#include "ext2fs.h"
22
23struct link_struct {
24 const char *name;
25 int namelen;
26 ino_t inode;
27 int flags;
28 int done;
29};
30
31static int unlink_proc(struct ext2_dir_entry *dirent,
32 int offset,
33 int blocksize,
34 char *buf,
35 void *private)
36{
37 struct link_struct *ls = (struct link_struct *) private;
38
39 if (ls->name && (dirent->name_len != ls->namelen))
40 return 0;
41 if (ls->name && strncmp(ls->name, dirent->name, dirent->name_len))
42 return 0;
43 if (ls->inode && (dirent->inode != ls->inode))
44 return 0;
45
46 dirent->inode = 0;
47 ls->done++;
48 return DIRENT_ABORT|DIRENT_CHANGED;
49}
50
51errcode_t ext2fs_unlink(ext2_filsys fs, ino_t dir, const char *name, ino_t ino,
52 int flags)
53{
54 errcode_t retval;
55 struct link_struct ls;
56
57 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
58
59 if (!(fs->flags & EXT2_FLAG_RW))
60 return EXT2_ET_RO_FILSYS;
61
62 ls.name = name;
63 ls.namelen = name ? strlen(name) : 0;
64 ls.inode = ino;
65 ls.flags = 0;
66 ls.done = 0;
67
68 retval = ext2fs_dir_iterate(fs, dir, 0, 0, unlink_proc, &ls);
69 if (retval)
70 return retval;
71
72 return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
73}
74