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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/imfs.h>
#include <sys/param.h>
#include <dirent.h>
#include <string.h>
static ssize_t IMFS_dir_read(
rtems_libio_t *iop,
void *buffer,
size_t count
)
{
/*
* Read up to element iop->offset in the directory chain of the
* imfs_jnode_t struct for this file descriptor.
*/
const IMFS_directory_t *dir;
const rtems_chain_node *node;
const rtems_chain_control *entries;
struct dirent *dir_ent;
ssize_t bytes_transferred;
off_t current_entry;
off_t first_entry;
off_t last_entry;
rtems_filesystem_instance_lock( &iop->pathinfo );
dir = IMFS_iop_to_directory( iop );
entries = &dir->Entries;
/* Move to the first of the desired directory entries */
bytes_transferred = 0;
first_entry = iop->offset;
/* protect against using sizes that are not exact multiples of the */
/* -dirent- size. These could result in unexpected results */
last_entry = first_entry
+ (count / sizeof( *dir_ent )) * sizeof( *dir_ent );
/* The directory was not empty so try to move to the desired entry in chain*/
for (
current_entry = 0,
node = rtems_chain_immutable_first( entries );
current_entry < last_entry
&& !rtems_chain_is_tail( entries, node );
current_entry += sizeof( *dir_ent ),
node = rtems_chain_immutable_next( node )
) {
if( current_entry >= first_entry ) {
const IMFS_jnode_t *imfs_node = (const IMFS_jnode_t *) node;
dir_ent = (struct dirent *) ((char *) buffer + bytes_transferred);
/* Move the entry to the return buffer */
dir_ent->d_off = current_entry;
dir_ent->d_reclen = sizeof( *dir_ent );
dir_ent->d_ino = IMFS_node_to_ino( imfs_node );
#ifdef DT_DIR
dir_ent->d_type = IFTODT( imfs_node->st_mode );
#endif
dir_ent->d_namlen =
MIN( imfs_node->namelen, sizeof( dir_ent->d_name ) - 1 );
dir_ent->d_name[ dir_ent->d_namlen ] = '\0';
memcpy( dir_ent->d_name, imfs_node->name, dir_ent->d_namlen );
iop->offset += sizeof( *dir_ent );
bytes_transferred += (ssize_t) sizeof( *dir_ent );
}
}
rtems_filesystem_instance_unlock( &iop->pathinfo );
return bytes_transferred;
}
static size_t IMFS_directory_size( const IMFS_jnode_t *node )
{
size_t size = 0;
const IMFS_directory_t *dir = (const IMFS_directory_t *) node;
const rtems_chain_control *chain = &dir->Entries;
const rtems_chain_node *current = rtems_chain_immutable_first( chain );
const rtems_chain_node *tail = rtems_chain_immutable_tail( chain );
while ( current != tail ) {
size += sizeof( struct dirent );
current = rtems_chain_immutable_next( current );
}
return size;
}
static int IMFS_stat_directory(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const IMFS_jnode_t *node = loc->node_access;
buf->st_size = IMFS_directory_size( node );
return IMFS_stat( loc, buf );
}
static const rtems_filesystem_file_handlers_r IMFS_dir_default_handlers = {
.open_h = rtems_filesystem_default_open,
.close_h = rtems_filesystem_default_close,
.read_h = IMFS_dir_read,
.write_h = rtems_filesystem_default_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek_directory,
.fstat_h = IMFS_stat_directory,
.ftruncate_h = rtems_filesystem_default_ftruncate_directory,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync_success,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.mmap_h = rtems_filesystem_default_mmap,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
const IMFS_mknod_control IMFS_mknod_control_dir_default = {
{
.handlers = &IMFS_dir_default_handlers,
.node_initialize = IMFS_node_initialize_directory,
.node_remove = IMFS_node_remove_directory,
.node_destroy = IMFS_node_destroy_default
},
.node_size = sizeof( IMFS_directory_t )
};
|
