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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011 Gunnar Beutner
*/
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_ctldir.h>
#include <sys/zpl.h>
static int
zpl_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, int connectable)
{
fid_t *fid = (fid_t *)fh;
struct inode *ip = dentry->d_inode;
int len_bytes, rc;
len_bytes = *max_len * sizeof (__u32);
if (len_bytes < offsetof(fid_t, fid_data))
return 255;
fid->fid_len = len_bytes - offsetof(fid_t, fid_data);
if (zfsctl_is_node(ip))
rc = zfsctl_fid(ip, fid);
else
rc = zfs_fid(ip, fid);
len_bytes = offsetof(fid_t, fid_data) + fid->fid_len;
*max_len = roundup(len_bytes, sizeof (__u32)) / sizeof (__u32);
return (rc == 0 ? FILEID_INO32_GEN : 255);
}
static struct dentry *
zpl_dentry_obtain_alias(struct inode *ip)
{
struct dentry *result;
#ifdef HAVE_D_OBTAIN_ALIAS
result = d_obtain_alias(ip);
#else
result = d_alloc_anon(ip);
if (result == NULL) {
iput(ip);
result = ERR_PTR(-ENOMEM);
}
#endif /* HAVE_D_OBTAIN_ALIAS */
return result;
}
static struct dentry *
zpl_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
fid_t *fid = (fid_t *)fh;
struct inode *ip;
int len_bytes, rc;
len_bytes = fh_len * sizeof (__u32);
if (fh_type != FILEID_INO32_GEN ||
len_bytes < offsetof(fid_t, fid_data) ||
len_bytes < offsetof(fid_t, fid_data) + fid->fid_len)
return ERR_PTR(-EINVAL);
rc = zfs_vget(sb, &ip, fid);
if (rc != 0)
return ERR_PTR(-rc);
ASSERT((ip != NULL) && !IS_ERR(ip));
return zpl_dentry_obtain_alias(ip);
}
static struct dentry *
zpl_get_parent(struct dentry *child)
{
cred_t *cr = CRED();
struct inode *ip;
int error;
crhold(cr);
error = -zfs_lookup(child->d_inode, "..", &ip, 0, cr, NULL, NULL);
crfree(cr);
ASSERT3S(error, <=, 0);
if (error)
return ERR_PTR(error);
return zpl_dentry_obtain_alias(ip);
}
const struct export_operations zpl_export_operations = {
.encode_fh = zpl_encode_fh,
.fh_to_dentry = zpl_fh_to_dentry,
.get_parent = zpl_get_parent
};
|
