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
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
Written by Michael I. Bushnell, p/BSG.
This file is part of the GNU Hurd.
The GNU Hurd 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.
The GNU Hurd 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "nfs.h"
#include <string.h>
#define CACHESIZE 512
static struct node *nodehash [CACHESIZE];
static inline int
hash (void *fhandle)
{
unsigned int h = 0;
int i;
for (i = 0; i < NFS_FHSIZE; i++)
h += ((char *)fhandle)[i];
return h % CACHESIZE;
}
struct node *
lookup_fhandle (void *fhandle)
{
struct node *np;
struct netnode *nn;
int h = hash (fhandle);
spin_lock (&netfs_node_refcnt_lock);
for (np = nodehash[h]; np; np = np->nn->hnext)
{
if (bcmp (np->nn->handle, fhandle, NFS_FHSIZE) != 0)
continue;
np->references++;
spin_unlock (&netfs_node_refcnt_lock);
mutex_lock (&np->lock);
return np;
}
nn = malloc (sizeof (struct netnode));
bcopy (fhandle, nn->handle, NFS_FHSIZE);
nn->stat_updated = 0;
nn->dtrans = NOT_POSSIBLE;
np = netfs_make_node (nn);
mutex_lock (&np->lock);
nn->hnext = nodehash[h];
if (nn->hnext)
nn->hnext->nn->hprevp = &nn->hnext;
nn->hprevp = &nodehash[h];
spin_unlock (&netfs_node_refcnt_lock);
return np;
}
void
netfs_node_norefs (struct node *np)
{
if (np->nn->dead_dir)
{
struct node *dir;
char *name;
np->references++;
spin_unlock (&netfs_node_refcnt_lock);
dir = np->nn->dead_dir;
name = np->nn->dead_name;
np->nn->dead_dir = 0;
np->nn->dead_name = 0;
netfs_nput (np);
mutex_lock (&dir->lock);
netfs_attempt_unlink ((struct netcred *)-1, dir, name);
netfs_nput (dir);
free (name);
/* Caller expects us to leave this locked... */
spin_lock (&netfs_node_refcnt_lock);
}
else
{
*np->nn->hprevp = np->nn->hnext;
if (np->nn->hnext)
np->nn->hnext->nn->hprevp = np->nn->hprevp;
if (np->nn->dtrans == SYMLINK)
free (np->nn->transarg.name);
free (np->nn);
free (np);
}
}
void
recache_handle (struct node *np, void *handle)
{
int h;
spin_lock (&netfs_node_refcnt_lock);
*np->nn->hprevp = np->nn->hnext;
if (np->nn->hnext)
np->nn->hnext->nn->hprevp = np->nn->hprevp;
bcopy (handle, np->nn->handle, NFS_FHSIZE);
h = hash (handle);
np->nn->hnext = nodehash[h];
if (np->nn->hnext)
np->nn->hnext->nn->hprevp = &np->nn->hnext;
np->nn->hprevp = &nodehash[h];
spin_unlock (&netfs_node_refcnt_lock);
}
|
