blob: 042995b878fd16d3d6439679a93ba50c21cdb055 (
plain) (
blame)
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
141
142
143
144
145
146
|
/*
* IMFS Initialization
*
* 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.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#include <stdlib.h>
/*
* IMFS_determine_bytes_per_block
*/
int imfs_memfile_bytes_per_block = 0;
static int IMFS_determine_bytes_per_block(
int *dest_bytes_per_block,
int requested_bytes_per_block,
int default_bytes_per_block
)
{
bool is_valid = false;
int bit_mask;
/*
* check, whether requested bytes per block is valid
*/
for (bit_mask = 16; !is_valid && (bit_mask <= 512); bit_mask <<= 1) {
if (bit_mask == requested_bytes_per_block) {
is_valid = true;
break;
}
if(bit_mask > requested_bytes_per_block)
break;
}
*dest_bytes_per_block = ((is_valid)
? requested_bytes_per_block
: default_bytes_per_block);
return 0;
}
/*
* IMFS_initialize
*/
int IMFS_initialize_support(
rtems_filesystem_mount_table_entry_t *temp_mt_entry,
const rtems_filesystem_operations_table *op_table,
const rtems_filesystem_file_handlers_r *link_handlers,
const rtems_filesystem_file_handlers_r *fifo_handlers
)
{
static int imfs_instance;
IMFS_fs_info_t *fs_info;
IMFS_jnode_t *jnode;
/*
* determine/check value for imfs_memfile_bytes_per_block
*/
IMFS_determine_bytes_per_block(&imfs_memfile_bytes_per_block,
imfs_rq_memfile_bytes_per_block,
IMFS_MEMFILE_DEFAULT_BYTES_PER_BLOCK);
/*
* Create the root node
*
* NOTE: UNIX root is 755 and owned by root/root (0/0).
*/
temp_mt_entry->mt_fs_root->location.node_access = IMFS_create_root_node();
temp_mt_entry->mt_fs_root->location.handlers = &IMFS_directory_handlers;
temp_mt_entry->mt_fs_root->location.ops = op_table;
temp_mt_entry->pathconf_limits_and_options = IMFS_LIMITS_AND_OPTIONS;
/*
* Create custom file system data.
*/
fs_info = calloc( 1, sizeof( IMFS_fs_info_t ) );
if ( !fs_info ) {
free(temp_mt_entry->mt_fs_root->location.node_access);
rtems_set_errno_and_return_minus_one(ENOMEM);
}
temp_mt_entry->fs_info = fs_info;
/*
* Set st_ino for the root to 1.
*/
fs_info->instance = imfs_instance++;
fs_info->ino_count = 1;
fs_info->link_handlers = link_handlers;
fs_info->fifo_handlers = fifo_handlers;
jnode = temp_mt_entry->mt_fs_root->location.node_access;
jnode->st_ino = fs_info->ino_count;
return 0;
}
int IMFS_node_clone( rtems_filesystem_location_info_t *loc )
{
IMFS_jnode_t *node = loc->node_access;
++node->reference_count;
return 0;
}
void IMFS_node_destroy( IMFS_jnode_t *node )
{
IMFS_assert( node->reference_count == 0 );
switch ( node->type ) {
case IMFS_MEMORY_FILE:
IMFS_memfile_remove( node );
break;
case IMFS_SYM_LINK:
free( node->info.sym_link.name );
break;
default:
break;
}
free( node );
}
void IMFS_node_free( const rtems_filesystem_location_info_t *loc )
{
IMFS_jnode_t *node = loc->node_access;
if ( node->reference_count == 1 ) {
IMFS_node_destroy( node );
} else {
--node->reference_count;
}
}
|
