1*6a54128fSAndroid Build Coastguard Worker /*
2*6a54128fSAndroid Build Coastguard Worker * unlink.c --- delete links in a ext2fs directory
3*6a54128fSAndroid Build Coastguard Worker *
4*6a54128fSAndroid Build Coastguard Worker * Copyright (C) 1993, 1994, 1997 Theodore Ts'o.
5*6a54128fSAndroid Build Coastguard Worker *
6*6a54128fSAndroid Build Coastguard Worker * %Begin-Header%
7*6a54128fSAndroid Build Coastguard Worker * This file may be redistributed under the terms of the GNU Library
8*6a54128fSAndroid Build Coastguard Worker * General Public License, version 2.
9*6a54128fSAndroid Build Coastguard Worker * %End-Header%
10*6a54128fSAndroid Build Coastguard Worker */
11*6a54128fSAndroid Build Coastguard Worker
12*6a54128fSAndroid Build Coastguard Worker #include "config.h"
13*6a54128fSAndroid Build Coastguard Worker #include <stdio.h>
14*6a54128fSAndroid Build Coastguard Worker #include <string.h>
15*6a54128fSAndroid Build Coastguard Worker #if HAVE_UNISTD_H
16*6a54128fSAndroid Build Coastguard Worker #include <unistd.h>
17*6a54128fSAndroid Build Coastguard Worker #endif
18*6a54128fSAndroid Build Coastguard Worker
19*6a54128fSAndroid Build Coastguard Worker #include "ext2_fs.h"
20*6a54128fSAndroid Build Coastguard Worker #include "ext2fs.h"
21*6a54128fSAndroid Build Coastguard Worker
22*6a54128fSAndroid Build Coastguard Worker struct link_struct {
23*6a54128fSAndroid Build Coastguard Worker const char *name;
24*6a54128fSAndroid Build Coastguard Worker int namelen;
25*6a54128fSAndroid Build Coastguard Worker ext2_ino_t inode;
26*6a54128fSAndroid Build Coastguard Worker int flags;
27*6a54128fSAndroid Build Coastguard Worker struct ext2_dir_entry *prev;
28*6a54128fSAndroid Build Coastguard Worker int done;
29*6a54128fSAndroid Build Coastguard Worker };
30*6a54128fSAndroid Build Coastguard Worker
31*6a54128fSAndroid Build Coastguard Worker #ifdef __TURBOC__
32*6a54128fSAndroid Build Coastguard Worker #pragma argsused
33*6a54128fSAndroid Build Coastguard Worker #endif
unlink_proc(struct ext2_dir_entry * dirent,int offset,int blocksize EXT2FS_ATTR ((unused)),char * buf EXT2FS_ATTR ((unused)),void * priv_data)34*6a54128fSAndroid Build Coastguard Worker static int unlink_proc(struct ext2_dir_entry *dirent,
35*6a54128fSAndroid Build Coastguard Worker int offset,
36*6a54128fSAndroid Build Coastguard Worker int blocksize EXT2FS_ATTR((unused)),
37*6a54128fSAndroid Build Coastguard Worker char *buf EXT2FS_ATTR((unused)),
38*6a54128fSAndroid Build Coastguard Worker void *priv_data)
39*6a54128fSAndroid Build Coastguard Worker {
40*6a54128fSAndroid Build Coastguard Worker struct link_struct *ls = (struct link_struct *) priv_data;
41*6a54128fSAndroid Build Coastguard Worker struct ext2_dir_entry *prev;
42*6a54128fSAndroid Build Coastguard Worker
43*6a54128fSAndroid Build Coastguard Worker prev = ls->prev;
44*6a54128fSAndroid Build Coastguard Worker ls->prev = dirent;
45*6a54128fSAndroid Build Coastguard Worker
46*6a54128fSAndroid Build Coastguard Worker if (ls->name) {
47*6a54128fSAndroid Build Coastguard Worker if (ext2fs_dirent_name_len(dirent) != ls->namelen)
48*6a54128fSAndroid Build Coastguard Worker return 0;
49*6a54128fSAndroid Build Coastguard Worker if (strncmp(ls->name, dirent->name, ext2fs_dirent_name_len(dirent)))
50*6a54128fSAndroid Build Coastguard Worker return 0;
51*6a54128fSAndroid Build Coastguard Worker }
52*6a54128fSAndroid Build Coastguard Worker if (!(ls->flags & EXT2FS_UNLINK_FORCE) && ls->inode) {
53*6a54128fSAndroid Build Coastguard Worker if (dirent->inode != ls->inode)
54*6a54128fSAndroid Build Coastguard Worker return 0;
55*6a54128fSAndroid Build Coastguard Worker } else {
56*6a54128fSAndroid Build Coastguard Worker if (!dirent->inode)
57*6a54128fSAndroid Build Coastguard Worker return 0;
58*6a54128fSAndroid Build Coastguard Worker }
59*6a54128fSAndroid Build Coastguard Worker
60*6a54128fSAndroid Build Coastguard Worker if (offset)
61*6a54128fSAndroid Build Coastguard Worker prev->rec_len += dirent->rec_len;
62*6a54128fSAndroid Build Coastguard Worker else
63*6a54128fSAndroid Build Coastguard Worker dirent->inode = 0;
64*6a54128fSAndroid Build Coastguard Worker ls->done++;
65*6a54128fSAndroid Build Coastguard Worker return DIRENT_ABORT|DIRENT_CHANGED;
66*6a54128fSAndroid Build Coastguard Worker }
67*6a54128fSAndroid Build Coastguard Worker
68*6a54128fSAndroid Build Coastguard Worker #ifdef __TURBOC__
69*6a54128fSAndroid Build Coastguard Worker #pragma argsused
70*6a54128fSAndroid Build Coastguard Worker #endif
ext2fs_unlink(ext2_filsys fs,ext2_ino_t dir,const char * name,ext2_ino_t ino,int flags)71*6a54128fSAndroid Build Coastguard Worker errcode_t ext2fs_unlink(ext2_filsys fs, ext2_ino_t dir,
72*6a54128fSAndroid Build Coastguard Worker const char *name, ext2_ino_t ino,
73*6a54128fSAndroid Build Coastguard Worker int flags)
74*6a54128fSAndroid Build Coastguard Worker {
75*6a54128fSAndroid Build Coastguard Worker errcode_t retval;
76*6a54128fSAndroid Build Coastguard Worker struct link_struct ls;
77*6a54128fSAndroid Build Coastguard Worker
78*6a54128fSAndroid Build Coastguard Worker EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
79*6a54128fSAndroid Build Coastguard Worker
80*6a54128fSAndroid Build Coastguard Worker if (!name && !ino)
81*6a54128fSAndroid Build Coastguard Worker return EXT2_ET_INVALID_ARGUMENT;
82*6a54128fSAndroid Build Coastguard Worker
83*6a54128fSAndroid Build Coastguard Worker if (!(fs->flags & EXT2_FLAG_RW))
84*6a54128fSAndroid Build Coastguard Worker return EXT2_ET_RO_FILSYS;
85*6a54128fSAndroid Build Coastguard Worker
86*6a54128fSAndroid Build Coastguard Worker ls.name = name;
87*6a54128fSAndroid Build Coastguard Worker ls.namelen = name ? strlen(name) : 0;
88*6a54128fSAndroid Build Coastguard Worker ls.inode = ino;
89*6a54128fSAndroid Build Coastguard Worker ls.flags = flags;
90*6a54128fSAndroid Build Coastguard Worker ls.done = 0;
91*6a54128fSAndroid Build Coastguard Worker ls.prev = 0;
92*6a54128fSAndroid Build Coastguard Worker
93*6a54128fSAndroid Build Coastguard Worker retval = ext2fs_dir_iterate(fs, dir, DIRENT_FLAG_INCLUDE_EMPTY,
94*6a54128fSAndroid Build Coastguard Worker 0, unlink_proc, &ls);
95*6a54128fSAndroid Build Coastguard Worker if (retval)
96*6a54128fSAndroid Build Coastguard Worker return retval;
97*6a54128fSAndroid Build Coastguard Worker
98*6a54128fSAndroid Build Coastguard Worker return (ls.done) ? 0 : EXT2_ET_DIR_NO_SPACE;
99*6a54128fSAndroid Build Coastguard Worker }
100*6a54128fSAndroid Build Coastguard Worker
101