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
|
/*
Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
/* Locked node DP is a new directory; add whatever links are necessary
to give it structure; its parent is the (locked) node PDP.
This routine may not call diskfs_lookup on PDP. The new directory
must be clear within the meaning of diskfs_dirempty.
CRED identifies the user making the call. */
error_t
diskfs_init_dir (struct node *dp, struct node *pdp, struct protid *cred)
{
struct dirstat *ds = alloca (diskfs_dirstat_size);
struct node *foo;
error_t err;
/* Fabricate a protid that represents root credentials. */
static uid_t zero = 0;
static struct idvec vec = {&zero, 1, 1};
static struct iouser user = {&vec, &vec, 0};
struct protid lookupcred = {{ .refcounts = { .references = {1, 0}}},
&user, cred->po, 0, 0};
/* New links */
if (pdp->dn_stat.st_nlink == diskfs_link_max - 1)
return EMLINK;
dp->dn_stat.st_nlink++; /* for `.' */
dp->dn_set_ctime = 1;
err = diskfs_lookup (dp, ".", CREATE, &foo, ds, &lookupcred);
assert (err == ENOENT);
err = diskfs_direnter (dp, ".", dp, ds, cred);
if (err)
{
dp->dn_stat.st_nlink--;
dp->dn_set_ctime = 1;
return err;
}
pdp->dn_stat.st_nlink++; /* for `..' */
pdp->dn_set_ctime = 1;
err = diskfs_lookup (dp, "..", CREATE, &foo, ds, &lookupcred);
assert (err == ENOENT);
err = diskfs_direnter (dp, "..", pdp, ds, cred);
if (err)
{
pdp->dn_stat.st_nlink--;
pdp->dn_set_ctime = 1;
return err;
}
diskfs_node_update (dp, diskfs_synchronous);
return 0;
}
|
