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
137
138
139
140
|
/**
* @file
*
* @brief IMFS Create a New Link Node
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-2010.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
static const IMFS_node_control IMFS_node_control_hard_link;
int IMFS_link(
const rtems_filesystem_location_info_t *parentloc,
const rtems_filesystem_location_info_t *targetloc,
const char *name,
size_t namelen
)
{
IMFS_jnode_t *new_node;
IMFS_jnode_t *target;
target = targetloc->node_access;
/*
* Verify this node can be linked to.
*/
if ( target->st_nlink >= LINK_MAX )
rtems_set_errno_and_return_minus_one( EMLINK );
/*
* Create a new link node.
*/
new_node = IMFS_create_node(
parentloc,
&IMFS_node_control_hard_link,
name,
namelen,
IMFS_STAT_FMT_HARD_LINK | ( S_IRWXU | S_IRWXG | S_IRWXO ),
target
);
if ( !new_node )
rtems_set_errno_and_return_minus_one( ENOMEM );
/*
* Increment the link count of the node being pointed to.
*/
target->reference_count++;
target->st_nlink++;
IMFS_update_ctime( target );
return 0;
}
static int IMFS_stat_hard_link(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_link_t *hard_link = loc->node_access;
rtems_filesystem_location_info_t targetloc = *loc;
targetloc.node_access = hard_link->link_node;
IMFS_Set_handlers( &targetloc );
return (targetloc.handlers->fstat_h)( &targetloc, buf );
}
static const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
.open_h = rtems_filesystem_default_open,
.close_h = rtems_filesystem_default_close,
.read_h = rtems_filesystem_default_read,
.write_h = rtems_filesystem_default_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek,
.fstat_h = IMFS_stat_hard_link,
.ftruncate_h = rtems_filesystem_default_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
static IMFS_jnode_t *IMFS_node_initialize_hard_link(
IMFS_jnode_t *node,
void *arg
)
{
IMFS_link_t *hard_link = (IMFS_link_t *) node;
hard_link->link_node = arg;
return node;
}
static IMFS_jnode_t *IMFS_node_remove_hard_link(
IMFS_jnode_t *node
)
{
IMFS_link_t *hard_link = (IMFS_link_t *) node;
IMFS_jnode_t *target = hard_link->link_node;
_Assert( target != NULL );
if ( target->st_nlink == 1) {
target = (*target->control->node_remove)( target );
if ( target == NULL ) {
node = NULL;
}
} else {
--target->st_nlink;
IMFS_update_ctime( target );
}
return node;
}
static const IMFS_node_control IMFS_node_control_hard_link = {
.handlers = &IMFS_link_handlers,
.node_size = sizeof(IMFS_link_t),
.node_initialize = IMFS_node_initialize_hard_link,
.node_remove = IMFS_node_remove_hard_link,
.node_destroy = IMFS_node_destroy_default
};
|
